/* ============================================================
   街艺社官网 - 样式文件
   涂鸦 × 霓虹 × 赛博朋克
   ============================================================ */

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c2a;

  --neon-cyan: #00f0ff;
  --neon-pink: #ff00aa;
  --neon-green: #b8ff00;
  --neon-purple: #a855f7;
  --neon-orange: #ff6a00;
  --neon-yellow: #facc15;

  --text-primary: #f0f0f5;
  --text-secondary: #8888aa;
  --text-muted: #555566;

  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Russo One", "Black Ops One", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  --radius: 12px;
  --radius-lg: 20px;

  --glow-cyan: 0 0 10px rgba(0, 240, 255, 0.3), 0 0 40px rgba(0, 240, 255, 0.1);
  --glow-pink: 0 0 10px rgba(255, 0, 170, 0.3), 0 0 40px rgba(255, 0, 170, 0.1);
  --glow-green: 0 0 10px rgba(184, 255, 0, 0.3), 0 0 40px rgba(184, 255, 0, 0.1);

  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--neon-cyan) var(--bg-primary);
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--neon-cyan);
  border-radius: 3px;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

/* ── Utility ───────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 120px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  text-align: center;
  margin-bottom: 16px;
  display: block;
  width: 100%;
}

.section-title .neon-text {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(0, 240, 255, 0.3));
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 60px;
}

/* ── Graffiti Decorations ──────────────────────────────────── */
.graffiti-border {
  position: relative;
}
.graffiti-border::before {
  content: "";
  position: absolute;
  inset: -3px;
  background: linear-gradient(
    135deg,
    var(--neon-cyan),
    var(--neon-pink),
    var(--neon-green),
    var(--neon-cyan)
  );
  background-size: 300% 300%;
  border-radius: calc(var(--radius) + 3px);
  z-index: -1;
  animation: gradientShift 6s ease infinite;
  opacity: 0;
  transition: opacity var(--transition);
}
.graffiti-border:hover::before {
  opacity: 1;
}

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

/* Spray paint splatter decoration */
.spray-dot {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.15;
}

/* ── Navigation ────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 24px;
  transition: var(--transition);
  backdrop-filter: blur(0px);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled,
body.nav-open .navbar {
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 240, 255, 0.1);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
  letter-spacing: 2px;
  cursor: pointer;
  transition: var(--transition);
}
.nav-logo:hover {
  text-shadow: 0 0 30px rgba(0, 240, 255, 0.8), 0 0 60px rgba(0, 240, 255, 0.4);
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  padding: 8px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: 999px;
  transition: var(--transition);
  position: relative;
  letter-spacing: 0.5px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.08);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--neon-cyan);
  border-radius: 1px;
  transition: transform var(--transition);
  box-shadow: 0 0 8px var(--neon-cyan);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--neon-cyan);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Hero Section ──────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* City skyline background with neon glow */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 100%, rgba(0, 240, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(255, 0, 170, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(184, 255, 0, 0.05) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-primary) 0%, #0d0d18 100%);
}

/* Animated city skyline silhouette */
.city-skyline {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 320px;
  z-index: 1;
}

.city-skyline svg {
  width: 100%;
  height: 100%;
  position: absolute;
  bottom: 0;
}

/* Neon light beams */
.neon-beam {
  position: absolute;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to top, transparent, var(--neon-cyan));
  opacity: 0.15;
  animation: beamPulse 4s ease-in-out infinite;
}

@keyframes beamPulse {
  0%, 100% { opacity: 0.05; height: 30%; }
  50% { opacity: 0.2; height: 60%; }
}

/* Floating particles */
#particles-canvas {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--neon-cyan);
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
  letter-spacing: 1px;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--neon-green);
  border-radius: 50%;
  animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(184, 255, 0, 0.4); }
  50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(184, 255, 0, 0); }
}

/* Graffiti style title */
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 8rem);
  line-height: 1.1;
  margin-bottom: 8px;
  position: relative;
}

.hero-title .main-text {
  display: block;
  background: linear-gradient(
    135deg,
    var(--neon-cyan) 0%,
    #00d4ff 25%,
    var(--neon-pink) 50%,
    var(--neon-purple) 75%,
    var(--neon-cyan) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: textGradient 5s linear infinite;
  filter: drop-shadow(0 0 30px rgba(0, 240, 255, 0.4))
    drop-shadow(0 0 60px rgba(255, 0, 170, 0.2));
}

@keyframes textGradient {
  to {
    background-position: 200% center;
  }
}

.hero-title .sub-text {
  display: block;
  font-size: clamp(1rem, 2.5vw, 1.8rem);
  color: var(--text-secondary);
  letter-spacing: 8px;
  text-transform: uppercase;
  margin-top: 8px;
  font-weight: 400;
}

.hero-slogan {
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  color: var(--text-secondary);
  margin-top: 24px;
  margin-bottom: 48px;
  font-weight: 300;
  letter-spacing: 2px;
}

.hero-slogan em {
  font-style: normal;
  color: var(--neon-cyan);
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

/* CTA Buttons */
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan), #00b8d4);
  color: var(--bg-primary);
  border: none;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.3), 0 4px 20px rgba(0, 0, 0, 0.3);
}
.btn-primary:hover {
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.5), 0 4px 30px rgba(0, 0, 0, 0.4);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
}
.btn-outline:hover {
  border-color: var(--neon-pink);
  color: var(--neon-pink);
  box-shadow: var(--glow-pink);
  transform: translateY(-2px);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 2px;
  animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-indicator .mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator .mouse::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--neon-cyan);
  border-radius: 2px;
  animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}
@keyframes scrollWheel {
  0%, 100% { opacity: 1; top: 8px; }
  50% { opacity: 0.3; top: 18px; }
}

/* ── About Section ─────────────────────────────────────────── */
.about {
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h3 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--neon-cyan);
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.9;
  margin-bottom: 24px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
  opacity: 0;
  transition: opacity var(--transition);
}
.stat-card:hover::before {
  opacity: 1;
}
.stat-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 4px;
}

/* Graffiti artwork area */
.about-visual {
  position: relative;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.graffiti-canvas {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

/* Graffiti SVG shapes */
.graffiti-shape {
  position: absolute;
  opacity: 0.6;
  transition: var(--transition);
}
.about-visual:hover .graffiti-shape {
  opacity: 0.9;
}

/* ── Projects Section ──────────────────────────────────────── */
.projects {
  position: relative;
}

/* Category filters */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 24px;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.5px;
}
.filter-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.1);
}
.filter-btn.active {
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
  border-color: rgba(0, 240, 255, 0.3);
  box-shadow: var(--glow-cyan);
}

/* Project cards grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

/* Corner graffiti accents */
.project-card::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 80px;
  height: 80px;
  background: linear-gradient(
    135deg,
    transparent 50%,
    rgba(0, 240, 255, 0.05) 50%
  );
  border-radius: 0 var(--radius-lg) 0 0;
  transition: var(--transition);
}

.project-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink), var(--neon-green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.project-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 240, 255, 0.15);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), var(--glow-cyan);
}
.project-card:hover::after {
  transform: scaleX(1);
}

.project-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  position: relative;
}

.project-icon.software {
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
  box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.1);
}
.project-icon.embedded {
  background: rgba(184, 255, 0, 0.1);
  color: var(--neon-green);
  box-shadow: inset 0 0 20px rgba(184, 255, 0, 0.1);
}
.project-icon.mechanical {
  background: rgba(255, 0, 170, 0.1);
  color: var(--neon-pink);
  box-shadow: inset 0 0 20px rgba(255, 0, 170, 0.1);
}
.project-icon.game {
  background: rgba(168, 85, 247, 0.1);
  color: var(--neon-purple);
  box-shadow: inset 0 0 20px rgba(168, 85, 247, 0.1);
}

.project-category {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 600;
}
.project-category.software {
  color: var(--neon-cyan);
  background: rgba(0, 240, 255, 0.08);
}
.project-category.embedded {
  color: var(--neon-green);
  background: rgba(184, 255, 0, 0.08);
}
.project-category.mechanical {
  color: var(--neon-pink);
  background: rgba(255, 0, 170, 0.08);
}
.project-category.game {
  color: var(--neon-purple);
  background: rgba(168, 85, 247, 0.08);
}

.project-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.project-tag {
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  transition: var(--transition);
}
.project-card:hover .project-tag {
  border-color: rgba(0, 240, 255, 0.15);
  color: var(--text-secondary);
}

/* Card hide/show animation for filter */
.project-card.hidden {
  display: none;
}
.project-card.fade-out {
  opacity: 0;
  transform: scale(0.95) translateY(10px);
}

/* ── Members Section ───────────────────────────────────────── */
.members {
  position: relative;
  background: var(--bg-secondary);
}

/* Graffiti neon separator */
.members::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 240, 255, 0.4) 15%,
    rgba(255, 0, 170, 0.4) 50%,
    rgba(184, 255, 0, 0.4) 85%,
    transparent
  );
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.2), 0 0 30px rgba(255, 0, 170, 0.1);
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.member-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.member-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 240, 255, 0.03),
    transparent
  );
  transition: left 0.8s ease;
}
.member-card:hover::before {
  left: 100%;
}

.member-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 240, 255, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.member-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 20px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--bg-primary);
  overflow: hidden;
}

/* Graffiti style avatar ring */
.member-avatar::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: conic-gradient(
    var(--neon-cyan),
    var(--neon-pink),
    var(--neon-green),
    var(--neon-cyan)
  );
  z-index: -1;
  animation: avatarSpin 8s linear infinite;
}

@keyframes avatarSpin {
  to {
    transform: rotate(360deg);
  }
}

.member-avatar-inner {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--bg-primary);
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.member-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
}

.member-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.member-role {
  color: var(--neon-cyan);
  font-size: 0.85rem;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.member-bio {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.member-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition);
}
.member-link:hover {
  color: var(--neon-cyan);
}

/* ── Media Section ─────────────────────────────────────────── */
.media {
  position: relative;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.media-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 240, 255, 0.15);
  transform: translateY(-4px);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.4);
}

.media-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  transition: var(--transition);
}

.media-card:hover .media-icon {
  transform: scale(1.1);
}

/* Media type colors */
.media-icon.blog {
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
}
.media-icon.github {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.media-icon.bilibili {
  background: rgba(255, 106, 0, 0.1);
  color: var(--neon-orange);
}
.media-icon.wechat {
  background: rgba(184, 255, 0, 0.1);
  color: var(--neon-green);
}
.media-icon.zhihu {
  background: rgba(0, 102, 255, 0.1);
  color: #4d8bf5;
}
.media-icon.twitter {
  background: rgba(168, 85, 247, 0.1);
  color: var(--neon-purple);
}
.media-icon.youtube {
  background: rgba(255, 0, 0, 0.1);
  color: #ff4444;
}
.media-icon.email {
  background: rgba(250, 204, 21, 0.1);
  color: var(--neon-yellow);
}

.media-info h4 {
  font-size: 1.05rem;
  margin-bottom: 4px;
  color: var(--text-primary);
  font-weight: 600;
}

.media-info p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}

.media-arrow {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%) translateX(-4px);
  color: var(--text-muted);
  font-size: 1.1rem;
  opacity: 0;
  transition: var(--transition);
}
.media-card:hover .media-arrow {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
  color: var(--neon-cyan);
}

/* ── Footer ────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 40px 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
  letter-spacing: 2px;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

/* ── Scroll Reveal Animation ───────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }
.reveal.delay-4 { transition-delay: 0.4s; }
.reveal.delay-5 { transition-delay: 0.5s; }

/* ── Neon flicker animation ────────────────────────────────── */
@keyframes neonFlicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {
    text-shadow:
      0 0 7px var(--neon-cyan),
      0 0 10px var(--neon-cyan),
      0 0 21px var(--neon-cyan),
      0 0 42px var(--neon-cyan);
  }
  20%, 24%, 55% {
    text-shadow: none;
  }
}

.neon-flicker {
  animation: neonFlicker 3s infinite alternate;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-visual {
    height: 300px;
  }
}

/* Prevent scroll when menu is open */
body.nav-open {
  overflow: hidden;
}

@media (max-width: 768px) {
  .section-padding {
    padding: 80px 0;
  }

  .nav-logo, .nav-toggle {
    position: relative;
    z-index: 1001;
  }

  .nav-links {
    display: flex;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 24px 0 32px;
    gap: 16px;
    z-index: 999;
    opacity: 0;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.35s ease, transform 0.35s ease;
  }
  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
  }
  .nav-overlay.open {
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    font-size: 1.2rem;
    padding: 12px 32px;
    width: 100%;
    text-align: center;
    opacity: 0;
    transform: translateY(8px);
    transition: color var(--transition), background var(--transition),
                opacity 0.3s ease, transform 0.3s ease;
  }
  .nav-links.open a {
    opacity: 1;
    transform: translateY(0);
  }
  .nav-links.open a:nth-child(1) { transition-delay: 0.05s; }
  .nav-links.open a:nth-child(2) { transition-delay: 0.1s; }
  .nav-links.open a:nth-child(3) { transition-delay: 0.15s; }
  .nav-links.open a:nth-child(4) { transition-delay: 0.2s; }
  .nav-links.open a:nth-child(5) { transition-delay: 0.25s; }
  .nav-links.open a:nth-child(6) { transition-delay: 0.3s; }

  .nav-toggle {
    display: flex;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .members-grid {
    grid-template-columns: 1fr;
  }

  .media-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-title .sub-text {
    letter-spacing: 4px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .project-card {
    padding: 24px;
  }

  .member-card {
    padding: 24px;
  }

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

  .stat-card {
    padding: 20px;
  }
}

/* ── Graffiti paint drip decoration ────────────────────────── */
.paint-drip {
  position: absolute;
  width: 4px;
  background: var(--neon-cyan);
  border-radius: 0 0 4px 4px;
  opacity: 0.2;
  z-index: 0;
}

/* ── Section separator - graffiti line ─────────────────────── */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 240, 255, 0.2) 20%,
    rgba(255, 0, 170, 0.2) 50%,
    rgba(184, 255, 0, 0.2) 80%,
    transparent
  );
  margin: 0;
}

/* ── Noise texture overlay ─────────────────────────────────── */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ── Floating Music Player ────────────────────────────────── */
.floating-player {
  position: fixed;
  right: 28px;
  bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  background: rgba(10, 10, 15, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  z-index: 997;
  min-width: 280px;
  transition: all 0.3s ease;
}

.floating-player.collapsed {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  width: 60px;
  height: 60px;
  gap: 0;
  min-width: auto;
}

.fp-panel {
  display: flex;
  align-items: center;
  gap: 16px;
  transition: opacity 0.25s ease, width 0.25s ease;
}
.floating-player.collapsed .fp-panel {
  opacity: 0;
  pointer-events: none;
  width: 0;
  margin: 0;
}

.fp-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.fp-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.fp-status {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.fp-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
/* PLACEHOLDER_FP_CSS_1 */

.fp-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: linear-gradient(135deg, rgba(41, 151, 255, 0.18), rgba(255, 255, 255, 0.1));
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.fp-btn:hover {
  box-shadow: 0 0 14px rgba(41, 151, 255, 0.35);
}
.fp-btn:active {
  transform: scale(0.94);
}

.fp-ball {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: radial-gradient(circle at 30% 30%, #ffcb69, #ff6b6b 70%);
  color: #111;
  font-size: 1.3rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  outline: none;
  flex-shrink: 0;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  animation: fpSpin 8s linear infinite;
}
.fp-ball .fp-icon {
  position: relative;
  z-index: 2;
}
.fp-pulse {
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  opacity: 0.35;
  z-index: 1;
  animation: fpPulse 2.6s ease-in-out infinite;
}
/* PLACEHOLDER_FP_CSS_2 */

.floating-player:not(.collapsed) .fp-ball {
  width: 34px;
  height: 34px;
  font-size: 1rem;
  box-shadow: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(41, 151, 255, 0.25));
  animation: none;
}
.floating-player:not(.collapsed) .fp-pulse {
  display: none;
}
.fp-ball:active {
  transform: scale(0.94);
}

@keyframes fpPulse {
  0% { transform: scale(1); opacity: 0.35; }
  70% { transform: scale(1.35); opacity: 0; }
  100% { opacity: 0; }
}
@keyframes fpSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.audio-visualizer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: 100px;
  pointer-events: none;
  z-index: 900;
  mix-blend-mode: screen;
}

@media (max-width: 480px) {
  .floating-player {
    right: 16px;
    bottom: 16px;
  }
}

/* ── Recruit Section ─────────────────────────────────────── */
.recruit {
  position: relative;
  padding-top: 30px;
}

.recruit-form-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  position: relative;
  overflow: hidden;
}

.recruit-form-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink), var(--neon-green));
}

.recruit-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.form-label .required {
  color: var(--neon-pink);
  margin-left: 2px;
}

.form-input,
.form-textarea {
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-textarea:focus {
  border-color: rgba(0, 240, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.08);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.form-submit {
  padding: 16px 36px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, var(--neon-cyan), #00b8d4);
  color: var(--bg-primary);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.5px;
  margin-top: 8px;
}

.form-submit:hover {
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.4);
  transform: translateY(-2px);
}

.form-submit:active {
  transform: translateY(0);
}

.form-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.form-submit.loading {
  background: linear-gradient(135deg, var(--neon-pink), var(--neon-purple));
}

.form-feedback {
  text-align: center;
  padding: 12px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  display: none;
}

.form-feedback.success {
  display: block;
  background: rgba(184, 255, 0, 0.1);
  border: 1px solid rgba(184, 255, 0, 0.3);
  color: var(--neon-green);
}

.form-feedback.error {
  display: block;
  background: rgba(255, 80, 80, 0.1);
  border: 1px solid rgba(255, 80, 80, 0.3);
  color: #ff8888;
}

@media (max-width: 480px) {
  .recruit-form-card {
    padding: 32px 20px;
  }
}

/* ── Chat Assistant ───────────────────────────────────────── */
.chat-assistant {
  position: fixed;
  right: 30px;
  bottom: 98px;
  z-index: 998;
}

.chat-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: radial-gradient(circle at 30% 30%, #a78bfa, #6366f1 70%);
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35), 0 0 20px rgba(99, 102, 241, 0.3);
}
.chat-toggle:hover {
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35), 0 0 30px rgba(99, 102, 241, 0.5);
}
.chat-toggle:active {
  transform: scale(0.94);
}
.chat-assistant.open .chat-toggle {
  display: none;
}

.chat-panel {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 340px;
  height: 460px;
  background: rgba(15, 15, 18, 0.92);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  display: none;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}
.chat-assistant.open .chat-panel {
  display: flex;
}
/* PLACEHOLDER_CHAT_CSS_1 */

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.chat-header-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}
.chat-header-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition);
}
.chat-header-close:hover {
  color: var(--text-primary);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.chat-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.88rem;
  line-height: 1.6;
  word-break: break-word;
}
.chat-msg.assistant {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}
.chat-msg.user {
  align-self: flex-end;
  background: rgba(41, 151, 255, 0.2);
  color: var(--text-primary);
  border-bottom-right-radius: 4px;
}
.chat-msg.error {
  align-self: flex-start;
  background: rgba(255, 80, 80, 0.15);
  color: #ff8888;
  border-bottom-left-radius: 4px;
}

.chat-msg.assistant p { margin: 0 0 8px; }
.chat-msg.assistant p:last-child { margin-bottom: 0; }
.chat-msg.assistant code {
  padding: 2px 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
}
.chat-msg.assistant pre {
  background: rgba(0,0,0,0.4);
  border-radius: 8px;
  padding: 10px 12px;
  overflow-x: auto;
  margin: 8px 0;
}
.chat-msg.assistant pre code {
  background: none;
  padding: 0;
}
.chat-msg.assistant ul, .chat-msg.assistant ol {
  margin: 4px 0;
  padding-left: 20px;
}
/* PLACEHOLDER_CHAT_CSS_2 */

.chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.chat-input {
  flex: 1;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--transition);
}
.chat-input:focus {
  border-color: rgba(41, 151, 255, 0.4);
}
.chat-input::placeholder {
  color: var(--text-muted);
}
.chat-send {
  padding: 10px 16px;
  border-radius: 10px;
  border: none;
  background: rgba(41, 151, 255, 0.25);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}
.chat-send:hover {
  background: rgba(41, 151, 255, 0.4);
}
.chat-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.chat-typing {
  align-self: flex-start;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  border-bottom-left-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

@media (max-width: 480px) {
  .chat-assistant {
    right: 16px;
    bottom: 80px;
  }
  .chat-panel {
    width: calc(100vw - 32px);
    height: 400px;
    right: -8px;
  }
}