/* ============================================
   CSS RESET & DESIGN TOKENS
   ============================================ */
:root {
  --bg-deep: #080812;
  --blue: #00c6ff;
  --purple: #8b5cf6;
  --cyan: #00ffc8;
  --pink: #ff3c78;
  --amber: #f59e0b;
  --text-1: #f0f0f5;
  --text-2: #a0a0c0;
  --text-3: #606080;
  --glass-border: rgba(255,255,255,0.07);
  --glass-bg: rgba(255,255,255,0.025);
  --glass-bg-hover: rgba(255,255,255,0.05);
  --font-cn: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
  --font-en: 'Space Grotesk','Inter','Segoe UI',sans-serif;
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 28px;
  --transition-fast: 0.25s cubic-bezier(0.4,0,0.2,1);
  --transition-smooth: 0.45s cubic-bezier(0.4,0,0.2,1);
  --transition-bounce: 0.6s cubic-bezier(0.34,1.56,0.64,1);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }

body {
  background:var(--bg-deep);
  color:var(--text-1);
  font-family:var(--font-cn);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

::-webkit-scrollbar { width:5px; }
::-webkit-scrollbar-track { background:var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background:linear-gradient(180deg, var(--blue), var(--purple));
  border-radius:3px;
}

/* ============================================
   CANVAS BACKGROUND
   ============================================ */
#bg-canvas {
  position:fixed; top:0; left:0;
  width:100%; height:100%;
  z-index:-2; pointer-events:none;
}

/* ============================================
   CURSOR GLOW
   ============================================ */
.cursor-glow {
  position:fixed; pointer-events:none; z-index:9999;
  width:500px; height:500px;
  border-radius:50%;
  background:radial-gradient(50% 50%, rgba(0,198,255,0.12) 0%, rgba(139,92,246,0.08) 30%, rgba(0,255,200,0.03) 60%, transparent 70%);
  transform:translate(-50%,-50%);
  transition:opacity 0.3s;
  will-change:transform;
}

/* ============================================
   RASTER STRIPS OVERLAY
   ============================================ */
.raster-overlay {
  position:fixed; top:0; left:0;
  width:100%; height:100%;
  z-index:-1; pointer-events:none;
  display:flex;
}
.raster-strip {
  flex:1; min-width:28px;
  backdrop-filter:blur(50px);
  -webkit-backdrop-filter:blur(50px);
  mask-image:linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.12) 30%, rgba(0,0,0,0.12) 70%, transparent 100%);
  -webkit-mask-image:linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.12) 30%, rgba(0,0,0,0.12) 70%, transparent 100%);
}

/* ============================================
   FLOATING BUBBLES
   ============================================ */
.float-bubbles {
  position:fixed; top:0; left:0;
  width:100%; height:100%;
  z-index:-1; pointer-events:none;
}
.bubble {
  position:absolute;
  display:flex; align-items:center; justify-content:center;
  border-radius:50%;
  transition:all var(--transition-smooth);
}
.bubble .glow-ring {
  position:absolute; inset:-8px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(0,198,255,0.15) 0%, transparent 70%);
  animation:bubblePulse 3s ease-in-out infinite;
}
.bubble .icon-inner {
  width:60px; height:60px;
  border-radius:50%;
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.1);
  backdrop-filter:blur(10px);
  display:flex; align-items:center; justify-content:center;
  font-size:1.5rem;
  position:relative; z-index:1;
}

/* ============================================
   NAVIGATION
   ============================================ */
nav {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  padding:1.3rem 4rem;
  display:flex; justify-content:space-between; align-items:center;
  transition:all var(--transition-smooth);
}
nav.scrolled {
  padding:0.9rem 4rem;
  background:rgba(8,8,18,0.82);
  backdrop-filter:blur(30px);
  -webkit-backdrop-filter:blur(30px);
  border-bottom:1px solid rgba(255,255,255,0.06);
  box-shadow:0 8px 40px rgba(0,0,0,0.4);
}
.nav-logo {
  font-family:var(--font-en);
  font-size:1.6rem; font-weight:800;
  background:linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  letter-spacing:-1px;
  position:relative;
  text-decoration:none;
}
.nav-logo .dot {
  display:inline-block; width:7px; height:7px;
  background:var(--cyan);
  border-radius:50%;
  margin-left:2px;
  animation:pulse 1.5s ease-in-out infinite;
  vertical-align:super;
}
.nav-links { display:flex; gap:2.2rem; list-style:none; }
.nav-links a {
  color:var(--text-2); text-decoration:none;
  font-size:0.92rem; font-weight:500; letter-spacing:0.5px;
  transition:color var(--transition-fast);
  position:relative;
}
.nav-links a::after {
  content:''; position:absolute; bottom:-6px; left:0;
  width:0; height:1.5px;
  background:var(--blue);
  box-shadow:0 0 12px var(--blue);
  transition:width var(--transition-smooth);
}
.nav-links a:hover { color:#fff; }
.nav-links a:hover::after { width:100%; }
.nav-toggle {
  display:none; flex-direction:column; gap:5px;
  cursor:pointer; z-index:1001;
  background:none; border:none; padding:4px;
}
.nav-toggle span {
  display:block;
  width:26px; height:2px;
  background:#fff;
  transition:all var(--transition-fast);
  border-radius:2px;
}
.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); }

/* Mobile Nav */
.nav-links.mobile-on {
  display:flex; flex-direction:column;
  position:fixed; top:0; left:0; right:0; bottom:0;
  background:rgba(8,8,18,0.97);
  backdrop-filter:blur(35px);
  -webkit-backdrop-filter:blur(35px);
  justify-content:center; align-items:center;
  gap:2.8rem; z-index:1000;
}
.nav-links.mobile-on a { font-size:1.5rem; }

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height:100vh;
  display:flex; flex-direction:column;
  justify-content:center; align-items:center;
  text-align:center; padding:0 2rem;
  position:relative;
}
.hero-badge {
  display:inline-flex; align-items:center; gap:0.6rem;
  padding:0.55rem 1.3rem;
  border:1px solid rgba(0,198,255,0.25);
  border-radius:50px;
  font-size:0.82rem; color:var(--blue);
  background:rgba(0,198,255,0.04);
  margin-bottom:2.5rem;
  letter-spacing:2px;
  animation:fadeInUp 0.8s ease-out;
  backdrop-filter:blur(8px);
}
.hero-badge .live-dot {
  width:7px; height:7px;
  background:var(--cyan);
  border-radius:50%;
  animation:pulse 1.5s ease-in-out infinite;
  box-shadow:0 0 10px var(--cyan);
}
.title-wrapper {
  position:relative;
  animation:fadeInUp 0.8s ease-out 0.15s both;
}
.title-glow-layer {
  position:absolute; top:50%; left:50%;
  transform:translate(-50%,-50%);
  font-size:clamp(3rem, 8vw, 7rem);
  font-weight:900; letter-spacing:2px; white-space:nowrap;
  background:linear-gradient(135deg, var(--blue) 0%, var(--purple) 50%, var(--cyan) 100%);
  background-size:200% 200%;
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  animation:gradientShift 4s ease-in-out infinite;
  filter:blur(25px); opacity:0.6;
  user-select:none;
}
.title-above-layer {
  position:relative;
  font-size:clamp(3rem, 8vw, 7rem);
  font-weight:900; letter-spacing:2px; white-space:nowrap;
  background:linear-gradient(135deg, #fff 0%, var(--blue) 40%, var(--cyan) 100%);
  background-size:200% 200%;
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  animation:gradientShift 4s ease-in-out infinite;
}
.hero-subtitle {
  font-size:clamp(1rem, 2.3vw, 1.35rem);
  color:var(--text-2);
  max-width:620px;
  margin:2rem 0 2.8rem;
  line-height:1.8;
  animation:fadeInUp 0.8s ease-out 0.3s both;
}
.typewriter {
  color:var(--cyan);
  border-right:2px solid var(--cyan);
  animation:blink 0.8s step-end infinite;
  font-weight:500;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn-group {
  display:flex; gap:1.2rem; flex-wrap:wrap; justify-content:center;
  animation:fadeInUp 0.8s ease-out 0.45s both;
}
.btn {
  position:relative;
  padding:0.95rem 2.4rem;
  border-radius:50px;
  font-size:1rem; font-weight:600;
  text-decoration:none;
  letter-spacing:0.5px;
  overflow:hidden;
  transition:all var(--transition-smooth);
  backdrop-filter:blur(10px);
  border:none;
  cursor:pointer;
  font-family:var(--font-cn);
}
.btn-primary {
  background:linear-gradient(135deg, var(--blue), var(--purple));
  color:#fff;
  box-shadow:0 4px 30px rgba(0,198,255,0.25);
}
.btn-primary:hover {
  transform:translateY(-3px);
  box-shadow:0 8px 45px rgba(0,198,255,0.45);
}
.btn-outline {
  background:rgba(255,255,255,0.03);
  color:var(--blue);
  border:1.5px solid rgba(0,198,255,0.3);
}
.btn-outline:hover {
  background:rgba(0,198,255,0.06);
  border-color:var(--blue);
  box-shadow:0 0 30px rgba(0,198,255,0.2);
  transform:translateY(-3px);
}
.btn::before {
  content:''; position:absolute; top:50%; left:50%;
  width:0; height:0; border-radius:50%;
  background:rgba(255,255,255,0.12);
  transition:all 0.5s ease;
  transform:translate(-50%,-50%);
}
.btn:active::before { width:300px; height:300px; }

/* ============================================
   SCROLL HINT
   ============================================ */
.scroll-hint {
  position:absolute; bottom:2.5rem;
  display:flex; flex-direction:column; align-items:center; gap:0.4rem;
  animation:fadeInUp 0.8s ease-out 0.9s both;
  color:var(--text-2); font-size:0.75rem; letter-spacing:3px;
}
.scroll-hint .line {
  width:1px; height:45px;
  background:linear-gradient(180deg, var(--blue), transparent);
  animation:scrollLine 2s ease-in-out infinite;
}

/* ============================================
   SECTIONS COMMON
   ============================================ */
.section {
  padding:7rem 4rem;
  position:relative; z-index:1;
}
.section-header {
  text-align:center; margin-bottom:4.5rem;
}
.section-tag {
  font-family:var(--font-en);
  font-size:0.72rem; letter-spacing:4px;
  text-transform:uppercase;
  color:var(--blue);
  margin-bottom:1.2rem;
  display:block;
}
.section-title {
  font-size:clamp(2rem, 5vw, 3.4rem);
  font-weight:800; letter-spacing:1px;
  margin-bottom:1.2rem;
}
.section-title .hl {
  background:linear-gradient(135deg, var(--blue), var(--purple));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.section-line {
  width:70px; height:3px;
  background:linear-gradient(90deg, var(--blue), var(--purple));
  margin:0 auto; border-radius:2px;
}

/* ============================================
   GLASS CARDS (About / Members)
   ============================================ */
.about-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(270px, 1fr));
  gap:1.8rem; max-width:1150px; margin:0 auto;
}
.glass-card {
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-md);
  padding:2.8rem 2rem;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:all var(--transition-smooth);
  position:relative; overflow:hidden;
  transform-style:preserve-3d;
  perspective:800px;
}
.glass-card::before {
  content:''; position:absolute; top:0; left:-100%;
  width:100%; height:100%;
  background:linear-gradient(105deg, transparent 30%, rgba(255,255,255,0.03) 50%, transparent 70%);
  transition:left 0.7s;
}
.glass-card:hover::before { left:100%; }
.glass-card:hover {
  border-color:rgba(0,198,255,0.25);
  transform:translateY(-10px);
  box-shadow:0 25px 70px rgba(0,0,0,0.5), 0 0 40px rgba(0,198,255,0.06);
}
.glass-card .card-icon {
  font-size:2.6rem; margin-bottom:1.5rem;
  display:inline-block;
}
.glass-card .card-icon.float { animation:floatIcon 3.5s ease-in-out infinite; }
.glass-card:nth-child(2) .card-icon.float { animation-delay:0.5s; }
.glass-card:nth-child(3) .card-icon.float { animation-delay:1s; }
.glass-card:nth-child(4) .card-icon.float { animation-delay:1.5s; }
.glass-card h3 { font-size:1.25rem; font-weight:700; margin-bottom:0.8rem; color:#fff; }
.glass-card p { color:var(--text-2); line-height:1.75; font-size:0.93rem; }
.glass-card .card-glow {
  position:absolute; top:-50%; left:-50%;
  width:200%; height:200%;
  background:radial-gradient(circle at center, rgba(0,198,255,0.04) 0%, transparent 50%);
  opacity:0; transition:opacity 0.4s;
  pointer-events:none;
}
.glass-card:hover .card-glow { opacity:1; }

/* ============================================
   STATS
   ============================================ */
.stats-strip {
  padding:5rem 4rem;
  background:linear-gradient(180deg, transparent, rgba(0,198,255,0.015), transparent);
  position:relative; z-index:1;
}
.stats-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px, 1fr));
  gap:2.5rem; max-width:950px; margin:0 auto;
}
.stat-item { text-align:center; padding:2rem 1rem; }
.stat-num {
  font-family:var(--font-en);
  font-size:3.8rem; font-weight:900;
  background:linear-gradient(180deg, #fff 0%, var(--blue) 80%);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  line-height:1;
}
.stat-num .plus { font-size:2rem; }
.stat-label {
  color:var(--text-2); font-size:0.85rem;
  letter-spacing:2.5px; text-transform:uppercase;
  margin-top:.5rem;
}

/* ============================================
   ACTIVITIES
   ============================================ */
.activities-wrap { max-width:900px; margin:0 auto; }
.activity-row {
  display:grid; grid-template-columns:90px 1fr;
  gap:2rem; padding:2.2rem 0;
  border-bottom:1px solid var(--glass-border);
  transition:all var(--transition-smooth);
}
.activity-row:hover {
  padding-left:1.5rem;
  background:var(--glass-bg);
  margin:0 -1.5rem;
  padding-right:1.5rem;
  border-radius:var(--radius-sm);
  border-bottom-color:transparent;
}
.activity-date {
  font-family:var(--font-en);
  font-size:0.85rem; color:var(--blue);
  padding-top:.3rem;
}
.activity-info h3 { font-size:1.15rem; font-weight:700; margin-bottom:.5rem; }
.activity-info p { color:var(--text-2); line-height:1.7; font-size:0.92rem; }
.tag {
  display:inline-block;
  padding:0.2rem 0.9rem;
  border-radius:50px;
  font-size:0.72rem; margin-top:0.6rem;
  background:rgba(0,198,255,0.08);
  color:var(--blue);
  border:1px solid rgba(0,198,255,0.15);
  letter-spacing:1px;
}

/* ============================================
   MEMBERS
   ============================================ */
.members-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));
  gap:2rem; max-width:1050px; margin:0 auto;
}
.member-card {
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-md);
  padding:2.5rem 1.5rem;
  text-align:center;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:all var(--transition-smooth);
  position:relative; overflow:hidden;
}
.member-card:hover {
  border-color:rgba(0,198,255,0.25);
  transform:translateY(-8px);
  box-shadow:0 25px 60px rgba(0,0,0,0.5);
}
.member-avatar {
  width:85px; height:85px;
  border-radius:50%;
  margin:0 auto 1.2rem;
  background:linear-gradient(135deg, var(--blue), var(--purple));
  display:flex; align-items:center; justify-content:center;
  font-size:2.4rem;
  position:relative;
  overflow:hidden;
}
.member-avatar img {
  width:100%; height:100%;
  object-fit:cover;
  border-radius:50%;
}
.member-avatar::after {
  content:''; position:absolute; inset:-4px;
  border-radius:50%;
  background:linear-gradient(135deg, var(--blue), var(--purple), var(--cyan));
  opacity:0; transition:opacity 0.4s;
  z-index:-1; filter:blur(14px);
}
.member-card:hover .member-avatar::after { opacity:0.55; }
.member-card h3 { font-size:1.1rem; font-weight:700; margin-bottom:.25rem; }
.member-role { color:var(--blue); font-size:0.82rem; margin-bottom:.8rem; }
.member-bio { color:var(--text-2); font-size:0.85rem; line-height:1.6; }

/* ============================================
   CONTACT
   ============================================ */
.contact-wrap { max-width:600px; margin:0 auto; }
.form-group { position:relative; margin-bottom:1.2rem; }
.form-group input,
.form-group textarea {
  width:100%; padding:1.1rem 1.2rem;
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  color:#fff;
  font-family:var(--font-cn); font-size:0.95rem;
  transition:all var(--transition-fast);
  outline:none; resize:vertical;
  backdrop-filter:blur(8px);
}
.form-group textarea { min-height:130px; }
.form-group input:focus,
.form-group textarea:focus {
  border-color:var(--blue);
  box-shadow:0 0 25px rgba(0,198,255,0.08);
  background:rgba(0,198,255,0.03);
}
.form-group label {
  position:absolute; left:1.2rem; top:1.1rem;
  color:var(--text-2); font-size:0.92rem;
  pointer-events:none; transition:all var(--transition-fast);
}
.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
  top:-0.55rem; left:0.9rem;
  font-size:0.72rem; padding:0 0.5rem;
  background:var(--bg-deep); color:var(--blue);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color:transparent; }
.contact-meta {
  display:flex; gap:2rem; justify-content:center;
  flex-wrap:wrap; margin-top:3rem;
}
.contact-meta .meta-item {
  display:flex; align-items:center; gap:0.6rem;
  color:var(--text-2); font-size:0.88rem;
}
.meta-item .meta-icon {
  width:38px; height:38px;
  border-radius:50%;
  background:rgba(0,198,255,0.06);
  display:flex; align-items:center; justify-content:center;
  font-size:1.1rem;
  border:1px solid rgba(0,198,255,0.15);
}

/* ============================================
   FOOTER
   ============================================ */
footer {
  text-align:center; padding:3.5rem 2rem;
  border-top:1px solid var(--glass-border);
  position:relative; z-index:1;
}
footer p { color:var(--text-2); font-size:0.82rem; letter-spacing:1.5px; }
footer .heart { color:var(--pink); }

/* ============================================
   KEYFRAMES
   ============================================ */
@keyframes fadeInUp {
  from { opacity:0; transform:translateY(35px); }
  to { opacity:1; transform:translateY(0); }
}
@keyframes fadeInScale {
  from { opacity:0; transform:scale(0.9); }
  to { opacity:1; transform:scale(1); }
}
@keyframes gradientShift {
  0%,100% { background-position:0% 50%; }
  50% { background-position:100% 50%; }
}
@keyframes blink { 50% { border-color:transparent; } }
@keyframes pulse {
  0%,100% { opacity:1; transform:scale(1); }
  50% { opacity:0.4; transform:scale(1.4); }
}
@keyframes floatIcon {
  0%,100% { transform:translateY(0); }
  50% { transform:translateY(-12px); }
}
@keyframes scrollLine {
  0%,100% { opacity:0.2; transform:scaleY(0.8); }
  50% { opacity:1; transform:scaleY(1.4); }
}
@keyframes bubblePulse {
  0%,100% { transform:scale(1); opacity:0.5; }
  50% { transform:scale(1.2); opacity:1; }
}
@keyframes bubbleDrift {
  0% { transform:translate(0, 0) rotate(0deg); }
  33% { transform:translate(15px, -20px) rotate(3deg); }
  66% { transform:translate(-10px, -40px) rotate(-2deg); }
  100% { transform:translate(0, 0) rotate(0deg); }
}
@keyframes shimmer {
  0% { background-position:-200% 0; }
  100% { background-position:200% 0; }
}

/* Scroll Reveal */
.reveal {
  opacity:0; transform:translateY(45px);
  transition:all 0.9s cubic-bezier(0.4,0,0.2,1);
}
.reveal.on { opacity:1; transform:translateY(0); }
.reveal-d1 { transition-delay:0.1s; }
.reveal-d2 { transition-delay:0.2s; }
.reveal-d3 { transition-delay:0.3s; }
.reveal-d4 { transition-delay:0.4s; }

/* ============================================
   BLUR-UP PROGRESSIVE IMAGE LOADING
   ============================================ */
.blur-loading {
  position:relative;
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}
.blur-loading::before {
  content:'';
  position:absolute; inset:0;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:opacity 0.5s ease;
  z-index:1;
  pointer-events:none;
}
.blur-loading.loaded::before {
  opacity:0;
}
.blur-loading img {
  position:relative;
  z-index:2;
  transition:opacity 0.5s ease;
}
.blur-loading:not(.loaded) img {
  opacity:0;
}
.blur-loading.loaded img {
  opacity:1;
}

/* Stack card blur support */
.image-stack .stack-card.blur-loading::before {
  border-radius:var(--radius-md);
}
.image-stack .stack-card.blur-loading img {
  width:100%; height:100%; object-fit:cover;
  position:relative; z-index:2;
}

/* Member avatar blur support */
.member-avatar.blur-loading::before {
  border-radius:50%;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}