/* ==========================================================================
   DAIXUAN.CLOUD · 戴璇 个人主页样式表
   现代化响应式设计系统 · 双色彩模式 (Light/Dark) · 毛玻璃微质感
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 102, 241, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #8494ab;
  
  --accent-primary: #818cf8;
  --accent-secondary: #8b5cf6;
  --accent-3: #22d3ee;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #6366f1 28%, #a855f7 62%, #ec4899 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 24px 48px -16px rgba(0, 0, 0, 0.55), 0 0 24px -6px var(--accent-glow);
  --hairline: linear-gradient(90deg, transparent, rgba(129, 140, 248, 0.55), rgba(236, 72, 153, 0.4), transparent);

  --nav-bg: rgba(10, 14, 23, 0.82);
  --glass-blur: blur(16px) saturate(150%);

  /* 噪点颗粒透明度（胶片质感，避免死平的纯色底） */
  --noise-opacity: 0.05;
  
  /* Typography & Sizing */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "HarmonyOS Sans SC", "MiSans", Roboto, "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1180px;

  /* 刘海屏 / 圆角屏安全区，未支持时回退为 0 */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(99, 102, 241, 0.45);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #5d6d84;
  
  --accent-primary: #4f46e5;
  --accent-secondary: #7c3aed;
  --accent-3: #0891b2;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #7c3aed 50%, #db2777 100%);
  --accent-glow: rgba(79, 70, 229, 0.18);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 24px 48px -16px rgba(15, 23, 42, 0.16), 0 0 24px -8px var(--accent-glow);
  --hairline: linear-gradient(90deg, transparent, rgba(79, 70, 229, 0.45), rgba(219, 39, 119, 0.32), transparent);

  --nav-bg: rgba(248, 250, 252, 0.85);
  --noise-opacity: 0.07;
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(80px + var(--safe-top)); /* 锚点跳转不被固定头部遮挡 */
  font-size: 16px;
  scrollbar-color: var(--bg-tertiary) var(--bg-primary);
  scrollbar-width: thin;
}

[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

body {
  font-family: var(--font-sans);
  /* 深空底色 + 双极光色晕：随页面滚动形成缓慢流动的纵深感 */
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(1100px 520px at 12% -4%, rgba(99, 102, 241, 0.13), transparent 62%),
    radial-gradient(900px 480px at 96% 12%, rgba(236, 72, 153, 0.08), transparent 60%),
    radial-gradient(1000px 620px at 50% 112%, rgba(34, 211, 238, 0.07), transparent 62%);
  background-repeat: no-repeat;
  background-size: 100% 900px, 100% 1100px, 100% 1200px;
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

[data-theme="light"] body {
  background-image:
    radial-gradient(1100px 520px at 12% -4%, rgba(99, 102, 241, 0.09), transparent 62%),
    radial-gradient(900px 480px at 96% 12%, rgba(236, 72, 153, 0.06), transparent 60%),
    radial-gradient(1000px 620px at 50% 112%, rgba(6, 182, 212, 0.06), transparent 62%);
}

/* Ambient Background Light Orbs */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.17;
  transition: var(--transition);
  animation: orbDrift 26s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes orbDrift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  50%  { transform: translate3d(4%, -3%, 0) scale(1.08); }
  100% { transform: translate3d(-3%, 4%, 0) scale(0.95); }
}

.orb-2 { animation-duration: 32s; animation-delay: -8s; }
.orb-3 { animation-duration: 38s; animation-delay: -16s; }

[data-theme="light"] .ambient-orb { opacity: 0.11; }

.orb-1 {
  width: 450px;
  height: 450px;
  background: #6366f1;
  top: -100px;
  left: 10%;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: #ec4899;
  top: 30%;
  right: -50px;
}

.orb-3 {
  width: 500px;
  height: 500px;
  background: #06b6d4;
  bottom: -150px;
  left: 20%;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 calc(24px + var(--safe-left)) 0 calc(24px + var(--safe-right));
  position: relative;
  z-index: 1;
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  /* 刘海屏：导航整体下移，避免被状态栏/挖孔遮挡 */
  padding-top: var(--safe-top);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  /* 顶部初始全透明，滚动后渐入玻璃拟态（见 .navbar.scrolled） */
  background: transparent;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease,
              backdrop-filter 0.35s ease, -webkit-backdrop-filter 0.35s ease;
}

/* 滚动后：玻璃拟态 + 渐变发丝线 */
.navbar.scrolled {
  background: var(--nav-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom-color: var(--border-color);
}

.navbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--hairline);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.navbar.scrolled::after { opacity: 1; }

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 800;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.brand-text span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.08);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle Button */
.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.1);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
}

/* Hero Section */
.hero-section {
  padding: 150px 0 90px;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 56px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-size: 0.875rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 20px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
  display: inline-block;
  animation: pulseDot 2s infinite;
}@keyframes pulseDot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: clamp(2.2rem, 5.4vw, 3.3rem); /* 流体排版，各尺寸都舒适 */
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.98rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Social Icon Pills */
.hero-socials {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.social-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.social-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Avatar Card */
.hero-avatar-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-card {
  position: relative;
  width: 280px;
  height: 280px;
  border-radius: 36px;
  padding: 8px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.avatar-card:hover {
  transform: translateY(-6px) rotate(1deg);
  border-color: var(--border-hover);
}

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 28px;
  object-fit: cover;
  display: block;
}

.avatar-floating-badge {
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

/* Section Common Styling */
.section {
  padding: 90px 0;
  scroll-margin-top: 88px;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.8vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.bento-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.bento-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.bento-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.bento-highlight {
  grid-column: span 2;
}

/* Skills Badges Grid */
.skills-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-category-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--card-shadow);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.category-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.chips-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.skill-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.08);
}

/* Projects Section */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

/* Featured Case Study Card layout */
.project-card.featured {
  grid-column: 1 / -1; /* Span full width on all screens by default */
  display: grid;
}@media (min-width: 900px) {
  .project-card.featured {
    grid-template-columns: 1.2fr 1fr;
  }
  .project-card.featured .project-cover {
    height: 100%;
    min-height: 320px;
    border-right: 1px solid var(--border-color);
  }
  .project-card.featured .project-body {
    padding: 48px 40px;
    justify-content: center;
  }
}@media (max-width: 899px) {
  .project-card.featured {
    grid-template-columns: 1fr;
  }
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition), opacity 0.35s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: rgba(56, 189, 248, 0.5); /* Brand accent color */
  box-shadow: 0 20px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(56, 189, 248, 0.2);
}

.project-cover {
  width: 100%;
  height: 240px; /* Slightly taller */
  position: relative;
  overflow: hidden;
  background: #020617;
}

.project-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card:hover .project-cover img {
  transform: scale(1.08);
}

.project-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tag-badge {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  font-weight: 600;
}

.project-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.project-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-primary);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.project-link:hover {
  text-decoration: underline;
  transform: translateX(2px);
}

/* Contact Card & Callout */
.contact-box {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: var(--card-shadow);
}

.contact-domain-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 0.95rem;
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 24px;
}

.contact-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: var(--transition);
  cursor: pointer;
}

.contact-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.contact-item-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
  display: block;
}

.contact-item h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: normal;
  overflow-wrap: anywhere;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 36px 0;
  background: var(--bg-secondary);
  margin-top: 60px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  row-gap: 10px;
  gap: 18px;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-primary);
}

/* Floating Action Button (Back to top) */
.back-to-top {
  position: fixed;
  bottom: calc(28px + var(--safe-bottom));
  right: calc(28px + var(--safe-right));
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  box-shadow: 0 4px 16px var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: var(--transition);
  z-index: 90;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: calc(30px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #1e293b;
  color: #f8fafc;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* WeChat QR Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 360px;
  width: 90%;
  text-align: center;
  box-shadow: var(--card-shadow);
  position: relative;
  transform: scale(0.92);
  transition: var(--transition);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ==========================================================================
   体验增强层：焦点可见 / 跳转链接 / 进度条 / 入场动画 / 微交互
   ========================================================================== */

/* 键盘焦点可见（鼠标点击不显示，键盘 Tab 才显示） */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

/* 无障碍跳转到主内容 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 24px;
  z-index: 999;
  background: var(--accent-gradient);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 12px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
}

/* 顶部阅读进度条 */
.scroll-progress {
  position: fixed;
  top: var(--safe-top);
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 120;
  background: transparent;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.08s linear;
}

/* 导航滚动后强化背景 */
.navbar.scrolled {
  box-shadow: 0 8px 30px -12px rgba(0, 0, 0, 0.45);
  border-bottom-color: var(--border-hover);
}

/* 滚动入场动画（仅在 JS 可用时隐藏初始状态，保证降级安全） */
html.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* 项目筛选：用 class 驱动，动画与布局解耦 */
.project-card.is-hidden {
  display: none;
}

.project-card.is-fading {
  opacity: 0;
}

/* 卡片顶部渐变高光（hover 时点亮，提升质感） */
.bento-card::after,
.edu-card::after,
.project-card .project-body::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.bento-card::after,
.edu-card::after {
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%),
              rgba(99, 102, 241, 0.12), transparent 60%);
}

.bento-card:hover::after,
.edu-card:hover::after {
  opacity: 1;
}

/* 卡片主色描边微光 */
.bento-card:hover,
.edu-card:hover,
.internship-card:hover,
.award-card:hover {
  box-shadow: var(--card-shadow), 0 0 0 1px var(--border-hover);
}

/* 美化滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* 打字机容器：固定高度并保留光标位，避免文字长度变化引起布局抖动 (CLS) */
#typing-role {
  display: inline-block;
  /* 独立字号 clamp：最长短语在 390px 窄屏也不折行，光标不产生竖线残影 */
  font-size: clamp(0.95rem, 3.4vw, 1.42rem);
  white-space: nowrap;
  min-height: 1.25em;
  border-right: 2px solid var(--accent-primary);
  padding-right: 4px;
  animation: caretBlink 1.1s step-end infinite;
}@keyframes caretBlink {
  0%, 100% { border-right-color: var(--accent-primary); }
  50% { border-right-color: transparent; }
}

/* ==========================================================================
   文本与尺寸工具类：收敛原本散落在 HTML 中的重复内联样式
   ========================================================================== */
.text-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.text-fine {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.text-body {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.text-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 数据看板指标：数值 / 说明 / 标签 */
.metric-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin: 4px 0;
}

.metric-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 小号按钮 */
.btn.btn-sm {
  font-size: 0.9rem;
}

/* 可点击的非按钮元素（如复制邮箱的 pill） */
.is-clickable {
  cursor: pointer;
}

/* 尊重系统「减弱动效」偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }

  .ambient-orb {
    display: none;
  }
}

/* 移动端：更大触摸目标 + 菜单遮罩 */
@media (max-width: 768px) {
  .nav-link {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav-menu.active {
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.6);
  }

  .hero-section {
    padding: 120px 0 70px;
    min-height: auto;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .contact-box {
    padding: 32px 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

/* 移动端菜单打开时锁定页面滚动 */
body.nav-open {
  overflow: hidden;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title {
    font-size: clamp(2rem, 5.2vw, 2.7rem);
  }
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-highlight {
    grid-column: span 2;
  }
  .skills-container {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-desc {
    margin: 0 auto 28px;
  }
  .hero-actions,
  .hero-socials {
    justify-content: center;
  }
  .hero-avatar-wrapper {
    order: -1;
  }
  .avatar-card {
    width: 220px;
    height: 220px;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-highlight {
    grid-column: span 1;
  }
  .mobile-toggle {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: calc(72px + var(--safe-top));
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}
/* Education Cards Grid */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.edu-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.edu-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.edu-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.edu-institution {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.edu-college {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.edu-period {
  font-size: 0.85rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  font-weight: 600;
  white-space: nowrap;
}

.edu-degree-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.edu-courses {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.edu-courses-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.edu-courses-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.course-tag {
  font-size: 0.8rem;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* Internships Grid */
.internships-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.internship-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.internship-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.internship-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
  flex-wrap: wrap;
}

.internship-company {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.internship-time {
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
}

.internship-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.internship-bullets li {
  position: relative;
  padding-left: 20px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.internship-bullets li::before {
  content: "▹";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-primary);
  font-weight: bold;
}

/* Awards & Honors Grid */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.award-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.award-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.award-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.3rem;
}

.award-content h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.award-level {
  font-size: 0.82rem;
  color: var(--accent-primary);
  font-weight: 600;
}

/* Contact Grid 4 columns */
.contact-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 36px;
}@media (max-width: 1024px) {
  .edu-grid,
  .internships-grid {
    grid-template-columns: 1fr;
  }
  .awards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}@media (max-width: 768px) {
  .awards-grid,
  .contact-grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Professional UI Enhancements: Impact Stats Strip, Project Badges & Details
   ========================================================================== */

/* Hero Section: Impact Stats Strip */
.hero-stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 28px;
  padding: 18px 24px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.stat-strip-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-strip-num {
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-feature-settings: "tnum";
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.stat-strip-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.35;
}@media (max-width: 768px) {
  .hero-stats-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 12px;
    padding: 16px 18px;
  }
  .stat-strip-num {
    font-size: 1.4rem;
  }
}

/* Project Card Key Metric Badge */
.project-metric-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
  margin-bottom: 10px;
  align-self: flex-start;
  letter-spacing: 0.01em;
}

.project-metric-badge.green {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.28);
}

.project-metric-badge.amber {
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  border-color: rgba(245, 158, 11, 0.28);
}

.project-metric-badge.blue {
  background: rgba(6, 182, 212, 0.12);
  color: #06b6d4;
  border-color: rgba(6, 182, 212, 0.28);
}

/* Competition Showcase UI Components */
.competition-hero-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--card-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  margin-bottom: 24px;
}

.competition-badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.team-tag {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.22), rgba(236, 72, 153, 0.22));
  color: #f8fafc;
  border: 1px solid rgba(99, 102, 241, 0.45);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.kpi-mini-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.kpi-mini-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  padding: 14px;
  transition: var(--transition);
}

.kpi-mini-box:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.kpi-mini-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-primary);
  margin: 2px 0;
}

.kpi-mini-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.kpi-mini-sub {
  font-size: 0.74rem;
  color: var(--text-secondary);
}

/* Callout Box for Methodological Disclosures */
.callout-box {
  background: rgba(99, 102, 241, 0.06);
  border-left: 3px solid var(--accent-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin: 16px 0;
}

.callout-box strong {
  color: var(--text-primary);
}

.callout-box.honest {
  background: rgba(245, 158, 11, 0.06);
  border-left-color: #f59e0b;
}

/* Subtle Inner Glow on Cards */
.bento-card,
.edu-card,
.internship-card,
.project-card,
.skill-category-card,
.award-card {
  box-shadow: var(--card-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* ==========================================================================
   V2 视觉升级层 · 深度美化
   渐变描边玻璃卡片 / 噪点颗粒 / 极光按钮光泽 / 头像旋转光环 / 微交互
   全部动画仅用 transform / opacity；触屏与减弱动效均已降级适配
   ========================================================================== */

/* ---- V2-1. 全局噪点颗粒（胶片质感，消除大面积纯色的死平感） ---- */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

::selection {
  background: rgba(99, 102, 241, 0.4);
  color: #fff;
}
[data-theme="light"] ::selection {
  background: rgba(99, 102, 241, 0.22);
  color: #0f172a;
}

/* ---- V2-2. 卡片渐变发丝描边（1px 渐变环，玻璃质感的点睛之笔） ---- */
.bento-card,
.edu-card,
.internship-card,
.award-card,
.skill-category-card,
.project-card,
.contact-box,
.modal-content {
  position: relative;
}

.bento-card::before,
.edu-card::before,
.internship-card::before,
.award-card::before,
.skill-category-card::before,
.project-card::before,
.contact-box::before,
.modal-content::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg,
      rgba(255, 255, 255, 0.16),
      rgba(255, 255, 255, 0.02) 32%,
      rgba(129, 140, 248, 0.22) 68%,
      rgba(236, 72, 153, 0.14));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
  transition: opacity 0.4s ease;
  opacity: 0.75;
  z-index: 2;
}

[data-theme="light"] .bento-card::before,
[data-theme="light"] .edu-card::before,
[data-theme="light"] .internship-card::before,
[data-theme="light"] .award-card::before,
[data-theme="light"] .skill-category-card::before,
[data-theme="light"] .project-card::before,
[data-theme="light"] .contact-box::before,
[data-theme="light"] .modal-content::before {
  background: linear-gradient(140deg,
      rgba(15, 23, 42, 0.10),
      rgba(15, 23, 42, 0.02) 32%,
      rgba(99, 102, 241, 0.20) 68%,
      rgba(219, 39, 119, 0.12));
}

/* ---- V2-3. 指针跟随高光：扩展到全部卡片类型 ---- */
.internship-card::after,
.award-card::after,
.skill-category-card::after,
.competition-hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  background: radial-gradient(560px circle at var(--mx, 50%) var(--my, 0%),
              rgba(99, 102, 241, 0.10), transparent 62%);
}

.internship-card:hover::after,
.award-card:hover::after,
.skill-category-card:hover::after,
.competition-hero-card:hover::after {
  opacity: 1;
}

/* ---- V2-4. 卡片悬停统一升级：更深浮起 + 柔和辉光 ---- */
.bento-card:hover,
.edu-card:hover,
.internship-card:hover,
.award-card:hover,
.skill-category-card:hover,
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

/* ---- V2-5. 区块标题装饰：标签胶囊化 + 标题渐变落笔线 ---- */
.section-tag {
  position: relative;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.09);
  border: 1px solid rgba(99, 102, 241, 0.22);
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 7px;
  vertical-align: 1px;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--accent-glow);
}

.section-header { position: relative; }

.section-header::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin: 18px auto 0;
  border-radius: var(--radius-full);
  background: var(--hairline);
  box-shadow: 0 0 14px var(--accent-glow);
}

.section-title,
.hero-title,
.project-title {
  text-wrap: balance;
}

/* ---- V2-6. 导航链接：渐变下划线滑入；品牌徽标光环 ---- */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.brand-icon {
  box-shadow: 0 4px 14px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  transition: var(--transition);
}

.nav-brand:hover .brand-icon {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

/* ---- V2-7. 主按钮：流光扫过 + 按压反馈 ---- */
.btn {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
}

.btn:active {
  transform: translateY(0) scale(0.97);
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: -20%;
  bottom: -20%;
  left: -70%;
  width: 44%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.38), transparent);
  transform: skewX(-20deg);
  transition: left 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.btn-primary:hover::after {
  left: 135%;
}

.btn-secondary {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ---- V2-8. 渐变文字流光（英雄区姓名） ---- */
.gradient-text {
  background-size: 220% 100%;
  animation: gradientPan 7s ease-in-out infinite alternate;
}

@keyframes gradientPan {
  0%   { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

/* 英雄区徽章：高光周期性掠过 */
.hero-badge {
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-badge::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 34%;
  left: -45%;
  background: linear-gradient(100deg, transparent, rgba(129, 140, 248, 0.22), transparent);
  transform: skewX(-18deg);
  animation: badgeSheen 4.2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes badgeSheen {
  0%, 55%  { left: -45%; }
  85%, 100% { left: 120%; }
}

/* ---- V2-9. 头像：旋转渐变光环 + 柔光投影 ---- */
@property --ring-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

.avatar-card {
  z-index: 1;
}

.avatar-card::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 39px;
  background: conic-gradient(from var(--ring-angle),
      #6366f1, #a855f7, #ec4899, #22d3ee, #6366f1);
  z-index: -1;
  animation: ringSpin 9s linear infinite;
  filter: saturate(1.15) blur(0.5px);
}

@keyframes ringSpin {
  to { --ring-angle: 360deg; }
}

.avatar-card {
  box-shadow: 0 24px 60px -18px rgba(99, 102, 241, 0.45), var(--card-shadow);
}

/* ---- V2-10. 数据条：栏间发丝分隔 + 悬停抬升 ---- */
@media (min-width: 769px) {
  .stat-strip-item + .stat-strip-item {
    border-left: 1px solid var(--border-color);
    padding-left: 20px;
  }
}

.stat-strip-item {
  transition: var(--transition);
}

.stat-strip-item:hover {
  transform: translateY(-2px);
}

.stat-strip-item:hover .stat-strip-num {
  filter: drop-shadow(0 0 10px var(--accent-glow));
}

/* ---- V2-11. 「最新作品」横幅组件化 ---- */
.latest-work-banner {
  position: relative;
  margin: 18px 0 4px;
  padding: 13px 16px 13px 19px;
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.10), rgba(236, 72, 153, 0.06) 55%, rgba(34, 211, 238, 0.07));
  border: 1px solid rgba(99, 102, 241, 0.22);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
  overflow: hidden;
}

.latest-work-banner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #818cf8, #ec4899);
  border-radius: var(--radius-full);
}

.latest-work-banner:hover {
  transform: translateX(3px);
  border-color: rgba(129, 140, 248, 0.45);
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.15), rgba(236, 72, 153, 0.09) 55%, rgba(34, 211, 238, 0.10));
}

.latest-work-banner a {
  color: var(--accent-primary);
  text-decoration: underline;
  font-weight: 600;
  white-space: nowrap;
}

/* ---- V2-12. 项目卡片：封面渐变遮罩 + 特色卡专属描边 ---- */
.project-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(2, 6, 23, 0.02) 55%, rgba(2, 6, 23, 0.42));
  opacity: 0.9;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.project-card:hover .project-cover::after {
  opacity: 0.55;
}

.project-card:hover .project-cover img {
  transform: scale(1.08);
  filter: saturate(1.12);
}

.project-card:hover .project-metric-badge {
  box-shadow: 0 0 14px -2px var(--accent-glow);
}

.project-card.featured::before {
  padding: 1.5px;
  background: linear-gradient(140deg,
      rgba(129, 140, 248, 0.5),
      rgba(255, 255, 255, 0.05) 30%,
      rgba(168, 85, 247, 0.28) 62%,
      rgba(236, 72, 153, 0.42));
  opacity: 1;
}

/* 筛选按钮：激活态辉光环 */
.tab-btn.active {
  box-shadow: 0 4px 14px var(--accent-glow), 0 0 0 1px rgba(129, 140, 248, 0.35);
}

/* ---- V2-13. 技能徽章：渐变呼吸点 ---- */
.skill-chip,
.course-tag {
  transition: var(--transition);
}

.skill-chip::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  transition: var(--transition);
  flex-shrink: 0;
}

.skill-chip:hover::before {
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--accent-glow);
}

.skill-chip:hover,
.course-tag:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

/* ---- V2-14. 联系卡：极光底光 + 渐变描边强化 ---- */
.contact-box {
  overflow: hidden;
}

.contact-box::after {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 70%;
  background:
    radial-gradient(420px 200px at 28% 0%, rgba(99, 102, 241, 0.14), transparent 70%),
    radial-gradient(420px 200px at 74% 8%, rgba(236, 72, 153, 0.10), transparent 70%);
  pointer-events: none;
}

.contact-box > * {
  position: relative;
  z-index: 1;
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px -14px rgba(0, 0, 0, 0.45), 0 0 0 1px var(--border-hover);
}

/* ---- V2-15. 页脚：渐变发丝线 + 玻璃化 ---- */
.footer {
  position: relative;
  border-top: none;
  background: color-mix(in srgb, var(--bg-secondary) 72%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--hairline);
}

/* ---- V2-16. 浮钮 / Toast / 弹窗质感 ---- */
.back-to-top {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.back-to-top:hover {
  box-shadow: 0 8px 26px rgba(99, 102, 241, 0.55);
}

.toast {
  background: color-mix(in srgb, var(--bg-tertiary) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ---- V2-17. 触屏设备：关闭悬停位移，避免点按粘滞 ---- */
@media (hover: none) {
  .bento-card:hover,
  .edu-card:hover,
  .internship-card:hover,
  .award-card:hover,
  .skill-category-card:hover,
  .project-card:hover,
  .stat-strip-item:hover,
  .contact-item:hover,
  .latest-work-banner:hover,
  .skill-chip:hover,
  .course-tag:hover {
    transform: none;
  }
}

/* ---- V2-18. 打印时移除噪点与光环 ---- */
@media print {
  body::after { display: none !important; }
  .avatar-card::before { display: none !important; }
}

/* ---- V2-19. 移动端微调 ---- */
@media (max-width: 768px) {
  .section-header::after { margin-top: 14px; }
  .latest-work-banner { margin: 14px 0 2px; }
  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}

/* ==================== PRINT STYLES ==================== */
@media print {
  .navbar, .ambient-glow, .back-to-top, #theme-toggle, #mobile-toggle,
  .scroll-progress, .hero-stats-strip, .floating-shapes {
    display: none !important;
  }
  body {
    background: #fff !important;
    color: #000 !important;
  }
  html.js .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  .hero-section {
    padding-top: 20px !important;
  }
  * {
    box-shadow: none !important;
    text-shadow: none !important;
  }
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #666;
  }
  a[href^="#"]::after,
  a[href^="javascript"]::after {
    content: "";
  }
}

/* ==========================================================================
   Command Palette (Ctrl/⌘ + K) · 简历 CTA · 邮箱内联
   ========================================================================== */

/* ---- 导航栏触发按钮：仅桌面端显示 ---- */
.palette-trigger {
  display: none;
  position: relative;
  gap: 8px;
}
@media (min-width: 769px) {
  .palette-trigger.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    height: 40px;
    padding: 0 12px;
    gap: 7px;
  }
}
.palette-kbd {
  font-family: inherit;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 3px 6px;
  white-space: nowrap;
}

/* ---- 面板 ---- */
.palette-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 16px;
  background: rgba(2, 6, 23, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.palette-overlay.active {
  display: flex;
}
.palette-panel {
  width: 100%;
  max-width: 580px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hover);
  border-radius: 16px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  animation: palette-pop 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes palette-pop {
  from { opacity: 0; transform: translateY(-10px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .palette-panel { animation: none; }
}
.palette-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
}
.palette-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
}
.palette-input::placeholder { color: var(--text-muted); }
.palette-list {
  max-height: 56vh;
  overflow-y: auto;
  padding: 8px;
  overscroll-behavior: contain;
}
.palette-group {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 10px 12px 4px;
}
.palette-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
}
.palette-item .pi-icon {
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}
.palette-item .pi-hint {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
}
.palette-item.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.palette-empty {
  padding: 28px 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* ---- 联系区块简历 CTA ---- */
.resume-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 26px;
}

/* ---- 弹窗内邮箱内联 ---- */
.mailbox-inline {
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
}

/* ==========================================================================
   图表 Lightbox · 跨文档视图过渡（渐进增强）
   ========================================================================== */

/* Chrome 126+ 跨页面平滑过渡；其余浏览器自动忽略 */
@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }
}

/* ---- 图表 lightbox ---- */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: zoom-out;
}
.lightbox-overlay.active {
  display: flex;
}
.lightbox-overlay:focus {
  outline: none;
}
.lightbox-img {
  max-width: 94vw;
  max-height: 90vh;
  border-radius: 10px;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6);
  background: #ffffff;
}

/* ==========================================================================
   沉浸体验层：开场加载幕 · 访客身份卡 · 身份徽章 · Cyber Twin 数字分身
   参考「记忆星海」式个人门户的体验设计，全部零依赖、尊重减弱动效偏好
   ========================================================================== */

/* ---- 开场加载幕（仅 html.js 时呈现，脚本失效则永不遮挡内容） ---- */
html:not(.js) .boot-screen { display: none; }

html.js .boot-screen {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(900px 480px at 50% -10%, rgba(99, 102, 241, 0.16), transparent 60%),
    radial-gradient(700px 420px at 80% 110%, rgba(236, 72, 153, 0.10), transparent 60%),
    var(--bg-primary);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

html.js .boot-screen.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.boot-stars i {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #cbd5f5;
  opacity: 0.7;
  animation: bootTwinkle 1.6s ease-in-out infinite;
}

.boot-stars i:nth-child(1)  { top: 12%; left: 14%; animation-delay: 0s;    transform: scale(0.8); }
.boot-stars i:nth-child(2)  { top: 22%; left: 78%; animation-delay: 0.3s;  transform: scale(1.2); }
.boot-stars i:nth-child(3)  { top: 64%; left: 8%;  animation-delay: 0.6s;  transform: scale(0.7); }
.boot-stars i:nth-child(4)  { top: 70%; left: 88%; animation-delay: 0.15s; transform: scale(1); }
.boot-stars i:nth-child(5)  { top: 34%; left: 32%; animation-delay: 0.9s;  transform: scale(0.6); }
.boot-stars i:nth-child(6)  { top: 18%; left: 52%; animation-delay: 1.2s;  transform: scale(0.9); }
.boot-stars i:nth-child(7)  { top: 78%; left: 38%; animation-delay: 0.45s; transform: scale(1.1); }
.boot-stars i:nth-child(8)  { top: 48%; left: 92%; animation-delay: 1.05s; transform: scale(0.7); }
.boot-stars i:nth-child(9)  { top: 86%; left: 66%; animation-delay: 0.75s; transform: scale(0.8); }
.boot-stars i:nth-child(10) { top: 8%;  left: 30%; animation-delay: 1.35s; transform: scale(1); }
.boot-stars i:nth-child(11) { top: 56%; left: 22%; animation-delay: 0.2s;  transform: scale(0.6); }
.boot-stars i:nth-child(12) { top: 40%; left: 62%; animation-delay: 0.55s; transform: scale(1.15); }
.boot-stars i:nth-child(13) { top: 90%; left: 16%; animation-delay: 0.95s; transform: scale(0.7); }
.boot-stars i:nth-child(14) { top: 28%; left: 92%; animation-delay: 1.5s;  transform: scale(0.85); }

@keyframes bootTwinkle {
  0%, 100% { opacity: 0.15; }
  50%      { opacity: 0.85; }
}

.boot-core {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.boot-logo {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  animation: bootPulse 1.4s ease-in-out infinite;
}

@keyframes bootPulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow), 0 12px 40px rgba(99, 102, 241, 0.45); }
  50%      { box-shadow: 0 0 0 14px transparent, 0 12px 40px rgba(99, 102, 241, 0.55); }
}

.boot-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.42em;
  text-indent: 0.42em; /* 抵消末字符字距，保持视觉居中 */
  color: var(--text-primary);
}

.boot-name span { color: var(--text-muted); font-weight: 500; }

.boot-bar {
  width: 200px;
  height: 3px;
  border-radius: var(--radius-full);
  background: rgba(148, 163, 184, 0.22);
  overflow: hidden;
}

.boot-bar span {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: var(--accent-gradient);
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 0.12s linear;
}

.boot-status {
  display: flex;
  justify-content: space-between;
  width: 200px;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.boot-tagline {
  position: absolute;
  bottom: calc(32px + var(--safe-bottom));
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  padding: 0 24px;
  text-align: center;
}

/* 减弱动效：加载幕直接不呈现，JS 同步跳过 */
@media (prefers-reduced-motion: reduce) {
  html.js .boot-screen { display: none; }
}

/* ---- 访客身份卡 ---- */
.welcome-card {
  max-width: 400px;
  text-align: center;
}

.welcome-spark {
  font-size: 1.3rem;
  color: var(--accent-primary);
  text-shadow: 0 0 18px var(--accent-glow);
  animation: bootTwinkle 2s ease-in-out infinite;
  margin-bottom: 6px;
}

.welcome-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.welcome-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

.avatar-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 20px 0 4px;
}

.avatar-opt {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  font-size: 1.35rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  filter: grayscale(0.35);
}

.avatar-opt:hover {
  transform: translateY(-3px);
  filter: none;
  border-color: var(--border-hover);
}

.avatar-opt.is-selected {
  filter: none;
  border: 2px solid var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-glow), 0 6px 18px rgba(99, 102, 241, 0.35);
  transform: translateY(-3px);
}

.welcome-label {
  display: block;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 16px 2px 6px;
}

.welcome-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
}

.welcome-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.welcome-sync-btn {
  width: 100%;
  justify-content: center;
  margin-top: 18px;
  font-size: 0.98rem;
}

.welcome-skip {
  margin-top: 14px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: color 0.2s ease;
}

.welcome-skip:hover { color: var(--text-secondary); }

/* ---- 访客身份徽章（左下角常驻） ---- */
.identity-chip {
  position: fixed;
  bottom: calc(24px + var(--safe-bottom));
  left: calc(24px + var(--safe-left));
  z-index: 95;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px 8px 9px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--nav-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-primary);
  cursor: pointer;
  box-shadow: var(--card-shadow);
  opacity: 0;
  transform: translateY(14px);
  transition: var(--transition);
}

.identity-chip.show {
  opacity: 1;
  transform: translateY(0);
}

.identity-chip:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.identity-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
}

.identity-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.3;
}

.identity-text strong {
  font-size: 0.85rem;
  font-weight: 700;
}

.identity-text em {
  font-style: normal;
  font-size: 0.68rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .identity-chip { bottom: calc(88px + var(--safe-bottom)); padding: 7px 12px 7px 8px; }
  .identity-text em { display: none; }
}

/* ---- Cyber Twin 数字分身挂件 ---- */
.twin-launcher {
  position: fixed;
  bottom: calc(24px + var(--safe-bottom));
  right: calc(84px + var(--safe-right));
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  z-index: 96;
  box-shadow: 0 10px 26px rgba(99, 102, 241, 0.45);
  transition: var(--transition);
}

.twin-launcher:hover { transform: translateY(-4px) scale(1.04); }

.twin-launcher-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--accent-primary);
  opacity: 0;
  animation: twinRipple 2.6s ease-out infinite;
  pointer-events: none;
}

@keyframes twinRipple {
  0%   { transform: scale(0.9); opacity: 0.55; }
  70%  { transform: scale(1.45); opacity: 0; }
  100% { transform: scale(1.45); opacity: 0; }
}

.twin-launcher[aria-expanded="true"] .twin-launcher-ring { animation: none; opacity: 0; }

.twin-drawer {
  position: fixed;
  bottom: calc(88px + var(--safe-bottom));
  right: calc(20px + var(--safe-right));
  width: min(360px, calc(100vw - 32px));
  max-height: min(560px, calc(100vh - 140px));
  z-index: 97;
  display: flex;
  flex-direction: column;
  border-radius: 18px;
  border: 1px solid var(--border-hover);
  background: var(--nav-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.98);
  transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s;
}

.twin-drawer.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.twin-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.14), rgba(236, 72, 153, 0.08));
}

.twin-avatar {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--accent-gradient);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.twin-title { display: flex; flex-direction: column; line-height: 1.35; min-width: 0; }

.twin-title strong { font-size: 0.95rem; }

.twin-title span {
  font-size: 0.72rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 5px;
}

.twin-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  display: inline-block;
}

.twin-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  transition: var(--transition);
}

.twin-close:hover { color: var(--text-primary); background: rgba(148, 163, 184, 0.12); }

.twin-log {
  flex: 1;
  overflow-y: auto;
  padding: 16px 14px 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overscroll-behavior: contain;
}

.twin-msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.88rem;
  line-height: 1.65;
  animation: twinMsgIn 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes twinMsgIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.twin-msg.bot {
  align-self: flex-start;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.twin-msg.user {
  align-self: flex-end;
  background: var(--accent-gradient);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.twin-msg a { color: var(--accent-primary); font-weight: 600; }
.twin-msg.user a { color: #fff; text-decoration: underline; }
.twin-msg ul { margin: 6px 0 0; padding-left: 18px; }

.twin-typing {
  align-self: flex-start;
  display: flex;
  gap: 4px;
  padding: 12px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  border-bottom-left-radius: 4px;
}

.twin-typing i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: twinBounce 1s ease-in-out infinite;
}

.twin-typing i:nth-child(2) { animation-delay: 0.15s; }
.twin-typing i:nth-child(3) { animation-delay: 0.3s; }

@keyframes twinBounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50%      { transform: translateY(-4px); opacity: 1; }
}

.twin-chips {
  display: flex;
  gap: 8px;
  padding: 4px 14px 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.twin-chips::-webkit-scrollbar { display: none; }

.twin-chip {
  flex-shrink: 0;
  padding: 6px 13px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.78rem;
  cursor: pointer;
  transition: var(--transition);
}

.twin-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.12);
}

.twin-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border-color);
}

.twin-input {
  flex: 1;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: inherit;
}

.twin-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.twin-send {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: none;
  background: var(--accent-gradient);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}

.twin-send:hover { transform: scale(1.06); }

.twin-foot {
  padding: 8px 14px 12px;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

.twin-foot a { color: var(--accent-primary); }

@media (max-width: 640px) {
  .twin-launcher { right: calc(20px + var(--safe-right)); bottom: calc(88px + var(--safe-bottom)); width: 48px; height: 48px; }
  .twin-drawer { right: 16px; bottom: calc(146px + var(--safe-bottom)); max-height: calc(100vh - 200px); }
}

/* back-to-top 避让 twin-launcher（两者同处右下角） */
body:has(.twin-launcher) .back-to-top {
  bottom: calc(88px + var(--safe-bottom));
}

@media (max-width: 640px) {
  body:has(.twin-launcher) .back-to-top { bottom: calc(152px + var(--safe-bottom)); }
}

/* ---- 璇玑星海入口按钮（渐变描边） ---- */
.btn-galaxy {
  position: relative;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg-secondary), var(--bg-secondary)) padding-box,
    var(--accent-gradient) border-box;
  color: var(--text-primary);
}

.btn-galaxy:hover {
  background:
    linear-gradient(var(--bg-tertiary), var(--bg-tertiary)) padding-box,
    var(--accent-gradient) border-box;
}

.btn-galaxy-star {
  color: var(--accent-primary);
  animation: bootTwinkle 1.8s ease-in-out infinite;
}