/* ===== Design Tokens ===== */
:root {
  --navy: #1a2744;
  --navy-light: #2a3a5c;
  --navy-dark: #0f1828;
  --accent: #2e5cb8;
  --accent-hover: #1a4a9e;
  --bg-white: #ffffff;
  --bg-light: #f5f7fa;
  --bg-gray: #eef1f5;
  --text-dark: #1a1a1a;
  --text-medium: #555;
  --text-light: #888;
  --text-white: #fff;
  --border: #e0e4ea;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 8px 30px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 50px rgba(0,0,0,.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --container: 1200px;
  --serif: 'Noto Serif SC','Source Han Serif SC','Songti SC','STSong','SimSun',serif;
  --sans: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}

/* ===== Reset ===== */
*,*::before,*::after { margin:0;padding:0;box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; overflow-x:hidden; }
body {
  font-family:var(--sans);
  color:var(--text-dark);
  background:var(--bg-white);
  line-height:1.6;
  overflow-x:hidden;
  width:100%;
}
img { max-width:100%; display:block; }
a { text-decoration:none; color:inherit; }
ul,ol { list-style:none; }
button { cursor:pointer; border:none; font-family:inherit; }
input,textarea { font-family:inherit; outline:none; }

/* ===== Container ===== */
.container { max-width:var(--container); margin:0 auto; padding:0 40px; }

/* ===== Navigation ===== */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  max-width:100%;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  transition:var(--transition);
}
.navbar.scrolled { box-shadow:var(--shadow-sm); }
.nav-inner {
  max-width:var(--container); margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  height:76px; padding:0 40px;
}
.nav-logo { display:flex; align-items:center; gap:10px; }
.nav-logo-icon-img { height:44px; width:auto; }
.footer .nav-logo-icon-img { height:40px; }
.nav-logo-text { display:flex; flex-direction:column; line-height:1.2; }
.nav-logo-text .cn { font-size:18px; font-weight:600; color:var(--navy); letter-spacing:1px; }
.nav-logo-text .en { font-size:10px; color:var(--text-light); letter-spacing:2px; text-transform:uppercase; }

.nav-menu { display:flex; align-items:center; gap:8px; }
.nav-menu a {
  padding:8px 16px; font-size:15px; color:var(--text-medium);
  position:relative; transition:var(--transition);
  border-radius:var(--radius-sm);
}
.nav-menu a::after {
  content:''; position:absolute; bottom:2px; left:50%; transform:translateX(-50%);
  width:0; height:2px; background:var(--accent); transition:var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { color:var(--navy); }
.nav-menu a:hover::after, .nav-menu a.active::after { width:20px; }

.nav-cta {
  background:var(--navy); color:#fff; border-radius:24px;
  padding:10px 28px; font-size:14px; transition:var(--transition);
}
.nav-cta:hover { background:var(--accent-hover); transform:translateY(-1px); }

.nav-toggle {
  display:none; flex-direction:column; gap:5px;
  background:none; padding:8px; z-index:1001; position:relative;
  min-width:44px; min-height:44px; justify-content:center; align-items:center;
  -webkit-tap-highlight-color:transparent; cursor:pointer;
}
.nav-toggle span {
  width:24px; height:2px; background:var(--navy);
  transition:all .3s cubic-bezier(.4,0,.2,1); border-radius:2px;
  transform-origin:center;
}
.nav-toggle.active span:nth-child(1) { transform:translateY(7px) rotate(45deg); background:var(--accent); }
.nav-toggle.active span:nth-child(2) { opacity:0; transform:scaleX(0); }
.nav-toggle.active span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); background:var(--accent); }
body.nav-locked { overflow:hidden; }

/* ===== Hero (Page Banner) ===== */
.hero {
  position:relative; min-height:420px;
  display:flex; align-items:center; justify-content:flex-start;
  margin-top:76px;
  overflow:hidden;
}
.hero-bg {
  position:absolute; inset:0;
  background-size:cover; background-position:center;
}
.hero-overlay {
  position:absolute; inset:0;
  background:linear-gradient(135deg,rgba(26,39,68,.82) 0%,rgba(26,39,68,.55) 100%);
}
.hero-content { position:relative; z-index:2; width:100%; padding:80px 0; }
.hero-content .container { width:100%; position:relative; }
.hero h1 {
  font-size:42px; font-weight:600; color:#fff;
  letter-spacing:4px; margin-bottom:16px; position:relative; z-index:2;
}
.hero .hero-en {
  font-family:var(--serif); font-size:80px; font-weight:700;
  color:rgba(255,255,255,.1); letter-spacing:4px;
  text-transform:uppercase; line-height:1; position:relative; z-index:1;
  margin-bottom:8px;
}

/* ===== Section Heading with Watermark ===== */
.section-head {
  position:relative; text-align:center;
  margin-bottom:50px; padding:0 20px;
}
.section-head .watermark {
  font-family:var(--serif); font-size:64px; font-weight:800;
  color:#e8e8e8; letter-spacing:4px; text-transform:uppercase;
  line-height:1; margin-bottom:8px; font-style:italic;
}
.section-head .subtitle {
  font-size:24px; font-weight:600; color:var(--navy);
  letter-spacing:2px; position:relative; display:inline-block;
}
.section-head .subtitle::after {
  content:''; position:absolute; bottom:-12px; left:50%; transform:translateX(-50%);
  width:40px; height:3px; background:var(--accent); border-radius:2px;
}

/* ===== Buttons ===== */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 32px; border-radius:24px; font-size:14px;
  transition:var(--transition); cursor:pointer;
}
.btn-primary { background:var(--navy); color:#fff; }
.btn-primary:hover { background:var(--accent-hover); transform:translateY(-2px); box-shadow:var(--shadow-md); }
.btn-outline { background:transparent; color:var(--navy); border:1.5px solid var(--navy); }
.btn-outline:hover { background:var(--navy); color:#fff; }
.btn-white { background:#fff; color:var(--navy); }
.btn-white:hover { background:var(--bg-light); }
.btn-link {
  display:inline-flex; align-items:center; gap:6px;
  color:var(--accent); font-size:14px; font-weight:500;
  transition:var(--transition);
}
.btn-link:hover { gap:10px; color:var(--navy); }

/* ===== Footer ===== */
.footer {
  /* background:var(--navy-dark); color:#a0aec0; */
  background-color:#000;
  padding:60px 0 0;
}
.footer-top {
  display:grid; grid-template-columns:2fr 1fr 1fr;
  gap:40px; padding-bottom:40px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.footer-brand .nav-logo-text .cn { color:#fff; }
.footer-brand .nav-logo-text .en { color:#6b7c93; }
.footer-desc { margin-top:20px; font-size:13px; line-height:1.8; color:#6b7c93; max-width:320px; }
.footer-desc .stat { color:#fff; font-size:18px; font-weight:600; margin-top:12px; display:block; }
.footer-col h4 { color:#fff; font-size:16px; margin-bottom:20px; letter-spacing:1px; }
.footer-col ul li { margin-bottom:12px; }
.footer-col ul li a { font-size:14px; color:#a0aec0; transition:var(--transition); }
.footer-col ul li a:hover { color:#fff; padding-left:4px; }
.footer-contact p { font-size:14px; margin-bottom:12px; color:#a0aec0; display:flex; align-items:center; gap:8px; }
.footer-contact p svg { flex-shrink:0; opacity:.7; }
.footer-bottom {
  display:flex; justify-content:space-between; align-items:center;
  padding:20px 0; font-size:13px; color:#6b7c93;
}
.footer-bottom a { color:#6b7c93; margin-left:20px; }
.footer-bottom a:hover { color:#a0aec0; }

/* ===== Animations ===== */
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px);} to{opacity:1;transform:translateY(0);} }
@keyframes fadeIn { from{opacity:0;} to{opacity:1;} }
@keyframes rotate { from{transform:rotate(0);} to{transform:rotate(360deg);} }
.fade-up { opacity:0; }
.fade-up.in { animation:fadeInUp .8s ease forwards; }

/* ===== Notice Popup ===== */
.notice-overlay {
  position:fixed; inset:0; z-index:9999;
  background:rgba(0,0,0,.65);
  backdrop-filter:blur(4px);
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden;
  transition:opacity .4s ease, visibility .4s;
}
.notice-overlay.show { opacity:1; visibility:visible; }
.notice-dialog {
  position:relative; max-width:680px; width:92%;
  border-radius:12px; overflow:hidden;
  box-shadow:0 24px 60px rgba(0,0,0,.3);
  transform:scale(.9) translateY(20px);
  transition:transform .4s cubic-bezier(.34,1.56,.64,1);
}
.notice-overlay.show .notice-dialog { transform:scale(1) translateY(0); }
.notice-dialog img { display:block; width:100%; height:auto; }
.notice-actions { padding:20px; background:#fff; text-align:center; }
.notice-btn {
  padding:12px 48px; border:none; border-radius:6px;
  background:var(--navy); color:#fff; font-size:16px;
  cursor:pointer; letter-spacing:1px;
  transition:background .25s ease, transform .15s ease;
}
.notice-btn:hover { background:var(--accent); transform:translateY(-2px); }
.notice-btn:active { transform:translateY(0); }
.notice-btn span { font-size:14px; opacity:.7; }
.notice-close {
  position:absolute; top:-36px; right:0;
  width:32px; height:32px; border-radius:50%;
  border:none; background:rgba(255,255,255,.3);
  color:#fff; font-size:22px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  transition:background .25s ease, transform .25s ease;
}
.notice-close:hover { background:rgba(255,255,255,.6); transform:rotate(90deg); }

@media (max-width:768px) {
  .notice-dialog { max-width:94%; }
  .notice-btn { padding:10px 32px; font-size:14px; }
}

/* ===== Responsive ===== */
@media (max-width:1024px) {
  .container, .nav-inner { padding:0 32px; }
  .nav-menu { gap:4px; }
  .nav-menu a { padding:8px 10px; font-size:14px; }
  .section-head .watermark { font-size:48px; }
  .hero h1 { font-size:36px; }
  .hero .hero-en { font-size:64px; }
}

@media (max-width:768px) {
  .container, .nav-inner { padding:0 20px; }
  .nav-menu, .nav-cta { display:none; }
  .nav-toggle { display:flex; }
  .nav-logo-icon-img { height:40px; }

  /* Mobile Menu */
  .nav-menu.mobile-open {
    display:flex; flex-direction:column; position:fixed;
    top:76px; left:0; right:0;
    height:calc(100vh - 76px);
    height:calc(100dvh - 76px);
    background:rgba(255,255,255,.98);
    backdrop-filter:blur(20px);
    padding:20px 20px 30px; gap:0;
    box-shadow:0 4px 30px rgba(0,0,0,.08);
    border-top:1px solid var(--border);
    overflow-y:auto; -webkit-overflow-scrolling:touch;
    overscroll-behavior:contain;
    animation:menuSlideDown .35s cubic-bezier(.4,0,.2,1);
    z-index:999;
  }
  @keyframes menuSlideDown {
    from { opacity:0; transform:translateY(-12px); }
    to { opacity:1; transform:translateY(0); }
  }
  .nav-menu.mobile-open::before {
    content:''; position:absolute; top:0; left:0; right:0; height:3px;
    background:linear-gradient(90deg, var(--navy), var(--accent), var(--navy));
  }
  .nav-menu.mobile-open li {
    opacity:0; transform:translateX(-16px);
    animation:menuItemSlide .4s ease forwards;
  }
  .nav-menu.mobile-open li:nth-child(1) { animation-delay:.05s; }
  .nav-menu.mobile-open li:nth-child(2) { animation-delay:.10s; }
  .nav-menu.mobile-open li:nth-child(3) { animation-delay:.15s; }
  .nav-menu.mobile-open li:nth-child(4) { animation-delay:.20s; }
  .nav-menu.mobile-open li:nth-child(5) { animation-delay:.25s; }
  .nav-menu.mobile-open li:nth-child(6) { animation-delay:.30s; }
  @keyframes menuItemSlide {
    to { opacity:1; transform:translateX(0); }
  }
  .nav-menu.mobile-open a {
    display:flex; align-items:center; gap:12px;
    padding:16px 20px; font-size:16px; font-weight:500;
    color:var(--text-dark); border-bottom:1px solid var(--bg-gray);
    border-radius:0; position:relative; transition:all .25s ease;
    -webkit-tap-highlight-color:transparent; min-height:52px;
  }
  .nav-menu.mobile-open a::before {
    content:''; position:absolute; left:0; top:50%; transform:translateY(-50%);
    width:3px; height:0; background:var(--accent); border-radius:0 2px 2px 0;
    transition:height .25s ease;
  }
  .nav-menu.mobile-open a:active, .nav-menu.mobile-open a.active {
    color:var(--accent); background:rgba(46,92,184,.06);
  }
  .nav-menu.mobile-open a:active::before, .nav-menu.mobile-open a.active::before {
    height:24px;
  }
  .nav-menu.mobile-open a::after { display:none; }
  .nav-menu.mobile-open li:last-child {
    margin-top:16px; border-bottom:none;
  }
  .nav-menu.mobile-open li:last-child a {
    background:var(--navy); color:#fff; border-radius:var(--radius-sm);
    justify-content:center; font-weight:600; padding:12px;
    border-bottom:none; font-size:15px;
  }
  .nav-menu.mobile-open li:last-child a:active {
    background:var(--accent);
  }
  .nav-menu.mobile-open li:last-child a::before { display:none; }

  .hero { min-height:280px; }
  .hero h1 { font-size:28px; letter-spacing:2px; }
  .hero .hero-en { font-size:42px; }
  .hero-content { padding:50px 0; }

  .section-head .watermark { font-size:36px; }
  .section-head .subtitle { font-size:20px; }

  .footer-top { grid-template-columns:1fr; gap:30px; }
  .footer-bottom { flex-direction:column; gap:10px; text-align:center; }
  .footer-bottom a { margin:0 10px; }
}

@media (max-width:480px) {
  .nav-logo-icon-img { height:36px; }
  .nav-menu.mobile-open { padding:16px 16px 24px; }
  .nav-menu.mobile-open a { padding:14px 16px; font-size:15px; }
}