/* ========================================
   CSS Variables & Theme
   ======================================== */
:root {
  --bg-primary: #f0f2f5;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.65);
  --bg-card-hover: rgba(255, 255, 255, 0.9);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a8;
  --border-color: rgba(255, 255, 255, 0.6);
  --shadow-color: rgba(0, 0, 0, 0.06);
  --shadow-hover: rgba(0, 0, 0, 0.12);
  --accent: #6366f1;
  --accent-rgb: 99, 102, 241;
  --accent-light: rgba(99, 102, 241, 0.1);
  --tag-bg: rgba(99, 102, 241, 0.08);
  --tag-text: #6366f1;
  --glow-color: rgba(99, 102, 241, 0.15);
  --glass-blur: 14px;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0a0a14;
  --bg-secondary: #12122a;
  --bg-card: rgba(25, 25, 50, 0.55);
  --bg-card-hover: rgba(35, 35, 65, 0.8);
  --text-primary: #e8e8f0;
  --text-secondary: #b0b0c8;
  --text-muted: #6a6a8a;
  --border-color: rgba(255, 255, 255, 0.06);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.5);
  --accent: #818cf8;
  --accent-rgb: 129, 140, 248;
  --accent-light: rgba(129, 140, 248, 0.15);
  --tag-bg: rgba(129, 140, 248, 0.1);
  --tag-text: #a5b4fc;
  --glow-color: rgba(129, 140, 248, 0.12);
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

/* ========================================
   Particle Canvas
   ======================================== */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: all;
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.page-content {
  position: relative;
  z-index: 1;
}

/* ========================================
   Header & Navigation
   ======================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.site-logo i {
  font-size: 1rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-menu a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent);
  background: var(--accent-light);
}

.nav-menu a i {
  font-size: 0.82rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: all var(--transition);
}

.menu-toggle:hover {
  color: var(--accent);
}

.menu-toggle.open i::before {
  content: "\f00d";
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle .toggle-label {
  display: none;
}

.theme-toggle:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: rotate(180deg);
}

/* ========================================
   Profile / Hero Section
   ======================================== */
.profile-section {
  padding-top: 100px;
  padding-bottom: 30px;
  text-align: center;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.profile-section > .container {
  width: 100%;
}

.avatar-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 24px;
  --ring-size: 148px;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: none;
  box-shadow: 0 0 30px rgba(var(--accent-rgb), 0.15);
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow var(--transition-slow);
  position: relative;
  z-index: 2;
}

.avatar:hover {
  transform: scale(1.06);
  box-shadow: 0 0 50px rgba(var(--accent-rgb), 0.3);
}

.avatar-ring {
  position: absolute;
  inset: 50%;
  width: var(--ring-size);
  height: var(--ring-size);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: transparent;
  z-index: 1;
  padding: 2px;
}

.avatar-ring::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  background: conic-gradient(
    from var(--ring-angle, 0deg),
    rgba(var(--accent-rgb), 0.8),
    rgba(236, 72, 153, 0.6),
    rgba(20, 184, 166, 0.4),
    transparent 40%,
    transparent 60%,
    rgba(245, 158, 11, 0.4),
    rgba(var(--accent-rgb), 0.8)
  ) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: ring-spin 4s linear infinite;
}

.avatar-ring::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: conic-gradient(
    from var(--ring-angle, 0deg),
    rgba(var(--accent-rgb), 0.25),
    transparent 30%,
    transparent 70%,
    rgba(var(--accent-rgb), 0.25)
  );
  filter: blur(8px);
  animation: ring-spin 4s linear infinite;
  z-index: -1;
}

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

@property --ring-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

.avatar-wrapper::before {
  content: "";
  position: absolute;
  inset: 50%;
  width: calc(var(--ring-size) + 20px);
  height: calc(var(--ring-size) + 20px);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent-rgb), 0.08) 0%, transparent 70%);
  animation: pulse-glow 3s ease-in-out infinite;
  z-index: 0;
}

@keyframes pulse-glow {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
  50% { transform: translate(-50%, -50%) scale(1.08); opacity: 1; }
}

.profile-name {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.typing-wrapper {
  min-height: 36px;
  margin-bottom: 12px;
}

.typing-text {
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: 500;
  display: inline;
}

.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.3em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.profile-bio {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.profile-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 28px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}

.social-link::after {
  content: attr(title);
  position: absolute;
  bottom: -32px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 3px 10px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.75rem;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  border: 1px solid var(--border-color);
}

.social-link:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.social-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(var(--accent-rgb), 0.35);
}

.scroll-hint {
  margin-top: 20px;
  animation: bounce 2s infinite;
}

.scroll-hint i {
  font-size: 1.5rem;
  color: var(--text-muted);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-12px); }
  60% { transform: translateY(-6px); }
}

/* ========================================
   Stats Section
   ======================================== */
.stats-section {
  padding: 10px 0 40px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--shadow-color);
  background: var(--bg-card-hover);
}

.stat-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 10px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2px;
  font-variant-numeric: tabular-nums;
}

.stat-value .stat-suffix {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 2px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ========================================
   Navigation Categories
   ======================================== */
.nav-section {
  padding: 20px 0 40px;
}

.category-block {
  margin-bottom: 44px;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-left: 4px;
}

.category-title i {
  color: var(--accent);
  font-size: 1.1rem;
}

.category-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-color), transparent);
  margin-left: 12px;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.link-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--card-accent, var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.link-card::after {
  content: "";
  position: absolute;
  top: var(--glow-y, 50%);
  left: var(--glow-x, 50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.link-card.has-glow::after {
  opacity: 1;
}

.link-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--shadow-color);
  border-color: rgba(var(--accent-rgb), 0.2);
}

.link-card:hover::before {
  opacity: 1;
}

.link-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  font-size: 1.3rem;
  color: #fff;
  background: var(--card-accent, var(--accent));
  flex-shrink: 0;
  transition: transform var(--transition);
  position: relative;
  z-index: 1;
}

.link-card:hover .link-icon {
  transform: scale(1.1) rotate(-5deg);
}

.link-info {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
}

.link-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.link-desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.link-arrow {
  color: var(--text-muted);
  font-size: 0.85rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.link-card:hover .link-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--accent);
}

/* ========================================
   Tech Stack Section
   ======================================== */
.tech-section {
  padding: 20px 0 60px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-left: 4px;
}

.section-title i {
  color: var(--accent);
  font-size: 1.1rem;
}

.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-color), transparent);
  margin-left: 12px;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.tech-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.tech-card::after {
  content: "";
  position: absolute;
  top: var(--glow-y, 50%);
  left: var(--glow-x, 50%);
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.tech-card.has-glow::after {
  opacity: 1;
}

.tech-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--shadow-color);
  background: var(--bg-card-hover);
  border-color: rgba(var(--accent-rgb), 0.15);
}

.tech-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  font-size: 1.15rem;
  color: #fff;
  flex-shrink: 0;
  transition: transform var(--transition);
  position: relative;
  z-index: 1;
}

.tech-card:hover .tech-icon {
  transform: scale(1.15) rotate(-5deg);
}

.tech-info {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
}

.tech-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.tech-progress {
  height: 4px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.tech-progress-fill {
  height: 100%;
  border-radius: 4px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.tech-level {
  font-size: 0.75rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  padding: 30px 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
}

.site-footer a {
  color: var(--accent);
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}

.footer-powered {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.7;
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: 50%;
  font-size: 1.1rem;
  color: var(--text-secondary);
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--shadow-color);
}

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

.back-to-top:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(var(--accent-rgb), 0.3);
}

/* ========================================
   Scroll Reveal Animations
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .profile-section {
    padding-top: 80px;
    min-height: 80vh;
  }

  .avatar {
    width: 96px;
    height: 96px;
  }

  .avatar-wrapper {
    --ring-size: 118px;
  }

  .profile-name {
    font-size: 1.8rem;
  }

  .typing-text {
    font-size: 1rem;
  }

  .profile-bio {
    font-size: 0.92rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  .links-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .link-card {
    padding: 16px;
  }

  .link-icon {
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }

  .tech-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
  }

  .tech-card {
    padding: 12px 14px;
  }

  .nav-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 12px 16px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    z-index: 90;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-menu a {
    padding: 10px 16px;
    width: 100%;
    border-radius: var(--radius-xs);
  }

  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .social-links {
    gap: 8px;
  }

  .social-link {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .social-link::after {
    display: none;
  }

  .category-title {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 1.1rem;
  }

  .stat-card {
    padding: 16px 12px;
  }

  .stat-value {
    font-size: 1.3rem;
  }

  .tech-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .tech-card {
    padding: 10px 12px;
    gap: 10px;
  }

  .tech-icon {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }

  .tech-name {
    font-size: 0.84rem;
  }
}