/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: #1a1a2e;
  background: #fff;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== Variables ===== */
:root {
  --primary: #C8102E;
  --accent: #E63946;
  --accent2: #6B7280;
  --light-bg: #F9FAFB;
  --border: #E5E7EB;
  --text-muted: #6B7280;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(200,16,46,0.08);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

/* ===== Container ===== */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(200,16,46,0.10); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.15rem; font-weight: 700; color: var(--primary);
}
.nav-logo .logo-icon {
  width: auto; height: 34px; background: none; border-radius: 0;
  display: flex; align-items: center; justify-content: center;
}
.nav-logo .logo-icon img { height: 34px; width: auto; display: block; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: .95rem; font-weight: 500; color: #444;
  transition: color var(--transition); position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent); border-radius: 2px;
  transform: scaleX(0); transition: transform var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff !important; padding: 8px 20px; border-radius: 24px;
  font-size: .9rem !important; font-weight: 600 !important;
  transition: opacity var(--transition), transform var(--transition) !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { opacity: .88; transform: translateY(-1px); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ===== Section Common ===== */
section { padding: 96px 0; }
.section-tag {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); background: rgba(200,16,46,.08);
  padding: 4px 14px; border-radius: 20px; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800; color: var(--primary);
  line-height: 1.25; margin-bottom: 16px;
}
.section-sub {
  font-size: 1.05rem; color: var(--text-muted); max-width: 560px;
}
.section-header { margin-bottom: 56px; }
.section-header.center { text-align: center; }
.section-header.center .section-sub { margin: 0 auto; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 30px; font-size: .95rem;
  font-weight: 600; cursor: pointer; border: none; transition: var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; box-shadow: 0 4px 20px rgba(200,16,46,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(200,16,46,.4); }
.btn-outline {
  background: transparent; color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ===== Cards ===== */
.card {
  background: #fff; border-radius: var(--radius); padding: 36px 30px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(200,16,46,0.12); }

/* ===== Grid ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== Tags / Badges ===== */
.tag {
  display: inline-block; font-size: .78rem; font-weight: 600;
  padding: 3px 10px; border-radius: 4px; background: rgba(200,16,46,.1);
  color: var(--accent);
}
.tag.green { background: rgba(107,114,128,.1); color: var(--accent2); }

/* ===== Footer ===== */
footer {
  background: var(--primary); color: rgba(255,255,255,.75);
  padding: 64px 0 32px;
}
footer .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
footer .footer-brand .logo-text { color: #fff; font-size: 1.1rem; font-weight: 700; margin-bottom: 14px; }
footer .footer-brand p { font-size: .9rem; line-height: 1.8; max-width: 260px; }
footer .footer-logo-wrap { display: flex; align-items: flex-end; gap: 10px; margin-bottom: 14px; }
footer .footer-logo-wrap .footer-logo-img { height: 34px; width: auto; }
footer .footer-logo-wrap .since-badge { font-size: .6rem; color: rgba(255,255,255,.4); font-weight: 500; letter-spacing: .08em; padding-bottom: 4px; white-space: nowrap; }
footer .footer-tagline { color: #fff; font-size: .95rem; font-weight: 600; margin-bottom: 8px; }
footer h4 { color: #fff; font-size: .95rem; font-weight: 700; margin-bottom: 18px; }
footer ul li { margin-bottom: 10px; }
footer ul li a { font-size: .88rem; transition: color var(--transition); }
footer ul li a:hover { color: #fff; }
footer .footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: .84rem;
}

/* ===== Footer QR ===== */
.footer-qr { display: flex; gap: 14px; margin-top: 18px; }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 76px; height: 76px; border-radius: 6px; display: block; background: #fff; padding: 3px; }
.footer-qr-item span { display: block; font-size: .68rem; color: rgba(255,255,255,.55); margin-top: 5px; }

/* ===== Page Hero (inner pages) ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #9B0D22 60%, #8B0A1E 100%);
  color: #fff; padding: 140px 0 80px; text-align: center;
}
.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; margin-bottom: 16px; }
.page-hero p { font-size: 1.1rem; opacity: .85; max-width: 560px; margin: 0 auto; }

/* ===== Fade-in Animation ===== */
.fade-up { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.fade-up.visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  footer .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; padding: 20px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  footer .footer-grid { grid-template-columns: 1fr; }
  footer .footer-bottom { flex-wrap: wrap; justify-content: center; gap: 8px 24px; text-align: center; }
  section { padding: 64px 0; }
}