/* ============================================
   SAWAN 鲸友会 Landing Page
   Design: Deep black-gold luxury theme
   ============================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep: #0a0a0f;
  --bg-dark: #12121a;
  --bg-card: #1a1a25;
  --bg-card-hover: #20202e;
  --gold: #c9a86a;
  --gold-bright: #e8c987;
  --gold-soft: #d4b87c;
  --gold-dark: #9a7e4a;
  --text-primary: #f0ede5;
  --text-secondary: #a8a499;
  --text-muted: #6b6760;
  --border: rgba(201, 168, 106, 0.15);
  --border-hover: rgba(201, 168, 106, 0.35);
  --serif: 'Cormorant Garamond', 'Noto Serif SC', serif;
  --cn-serif: 'Noto Serif SC', serif;
  --sans: 'Inter', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; position: relative; }

.section-tag {
  font-family: var(--sans);
  font-size: 12px; font-weight: 600;
  letter-spacing: 4px; text-transform: uppercase;
  color: var(--gold); margin-bottom: 16px;
  display: inline-block;
}

.section-title {
  font-family: var(--cn-serif);
  font-size: 42px; font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px; letter-spacing: 2px;
}

.section-desc {
  font-family: var(--cn-serif);
  font-size: 17px; color: var(--text-secondary);
  line-height: 2; max-width: 720px;
}

.section-header { text-align: center; margin-bottom: 60px; }
.section-header .section-desc { margin: 0 auto; }

.gold-text { color: var(--gold-bright); }
.gold-line { width: 60px; height: 1px; background: linear-gradient(90deg, transparent, var(--gold), transparent); margin: 24px auto; }

/* ===== Navigation ===== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 20px 0; transition: all 0.4s ease;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
nav.scrolled { padding: 12px 0; background: rgba(10,10,15,0.95); }
nav .container {
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-family: var(--cn-serif);
  font-size: 24px; font-weight: 700; letter-spacing: 4px;
  color: var(--gold-bright);
}
.nav-links { list-style: none; display: flex; gap: 36px; align-items: center; }
.nav-links a {
  color: var(--text-primary); text-decoration: none;
  font-size: 14px; font-weight: 400; letter-spacing: 1px;
  transition: color 0.3s; position: relative;
}
.nav-links a:hover { color: var(--gold); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
  height: 1px; background: var(--gold);
  transform: scaleX(0); transition: transform 0.3s;
}
.nav-links a:hover::after { transform: scaleX(1); }

.nav-back-home {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 7px 14px; margin-right: 12px;
  border: 1px solid var(--gold); color: var(--gold-bright);
  background: rgba(201, 168, 106, 0.08);
  font-size: 12px; letter-spacing: 1px; text-decoration: none;
  transition: all 0.3s; border-radius: 30px;
  white-space: nowrap;
}
.nav-back-home::before {
  content: '←'; font-size: 13px; transition: transform 0.3s;
}
.nav-back-home:hover { background: var(--gold); color: var(--bg-deep); }
.nav-back-home:hover::before { transform: translateX(-3px); }
.nav-cta {
  display: inline-block; padding: 10px 22px;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--bg-deep); font-size: 13px; font-weight: 600;
  letter-spacing: 1px; text-decoration: none;
  border-radius: 2px; transition: all 0.3s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(201,168,106,0.3); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  justify-content: center; position: relative; overflow: hidden;
  background: radial-gradient(ellipse at top, rgba(201,168,106,0.08), transparent 60%),
              var(--bg-deep);
  padding-top: 80px;
}
.hero-particles {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(201,168,106,0.4) 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, rgba(201,168,106,0.3) 1px, transparent 1px),
    radial-gradient(circle at 50% 90%, rgba(201,168,106,0.35) 1px, transparent 1px);
  background-size: 200px 200px, 250px 250px, 180px 180px;
  opacity: 0.5;
  animation: particleFloat 30s linear infinite;
}
@keyframes particleFloat {
  from { transform: translateY(0); }
  to { transform: translateY(-200px); }
}
.hero-content { text-align: center; position: relative; z-index: 2; padding: 0 24px; }
.hero-title {
  font-family: var(--cn-serif);
  font-size: 96px; font-weight: 700; letter-spacing: 8px;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--gold-bright), var(--gold), var(--gold-dark));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 80px rgba(232,201,135,0.2);
  margin-bottom: 12px;
}
.hero-tagline {
  font-family: var(--serif);
  font-size: 22px; font-style: italic; font-weight: 300;
  color: var(--gold-soft);
  letter-spacing: 2px; margin-top: 16px;
}
.hero-scroll {
  position: absolute; bottom: 40px; left: 50%;
  transform: translateX(-50%);
  font-size: 12px; letter-spacing: 4px; color: var(--text-muted);
}
.hero-scroll::after {
  content: ''; display: block; width: 1px; height: 30px;
  background: var(--gold); margin: 12px auto 0;
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ===== Core Intro Card (screenshot main block) ===== */
.core-intro { padding-top: 80px; padding-bottom: 80px; }
.core-card {
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  gap: 48px; align-items: center;
  background: linear-gradient(135deg, rgba(26,26,37,0.8), rgba(18,18,26,0.8));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 56px 48px;
  position: relative; overflow: hidden;
}
.core-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.core-icon-wrap {
  display: flex; align-items: center; justify-content: center;
  width: 200px; height: 200px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201,168,106,0.15), transparent 70%);
}
.whale-icon {
  font-size: 110px; line-height: 1;
  filter: drop-shadow(0 0 30px rgba(201,168,106,0.5));
}
.core-info { padding-right: 24px; }
.core-title {
  font-family: var(--cn-serif);
  font-size: 30px; font-weight: 700;
  color: var(--gold-bright);
  letter-spacing: 2px; margin-bottom: 8px;
}
.core-en {
  font-family: var(--serif);
  font-size: 18px; font-style: italic;
  color: var(--gold-soft); margin-bottom: 24px; opacity: 0.85;
}
.core-desc {
  font-family: var(--cn-serif);
  font-size: 15px; color: var(--text-secondary);
  line-height: 2;
}
.core-highlights {
  display: flex; flex-direction: column; gap: 16px;
}
.core-feature {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px;
  background: rgba(201,168,106,0.06);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary); text-decoration: none;
  transition: all 0.3s; font-size: 14px;
}
.core-feature:hover {
  background: rgba(201,168,106,0.12);
  border-color: var(--gold);
  transform: translateX(4px);
}
.core-feature-icon {
  color: var(--gold); font-size: 14px;
  flex-shrink: 0;
}
.core-feature-text { font-weight: 500; letter-spacing: 1px; }

/* ===== Privileges (4 core rights) ===== */
.privileges { background: linear-gradient(180deg, var(--bg-deep), var(--bg-dark)); }
.privilege-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}
.privilege-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 32px;
  position: relative; overflow: hidden;
  transition: all 0.4s;
}
.privilege-card:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(201,168,106,0.15);
}
.privilege-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0; transition: opacity 0.4s;
}
.privilege-card:hover::before { opacity: 1; }
.privilege-num {
  position: absolute; top: 20px; right: 24px;
  font-family: var(--serif);
  font-size: 48px; font-weight: 700;
  color: rgba(201,168,106,0.1);
  line-height: 1;
}
.privilege-icon {
  font-size: 48px; line-height: 1;
  margin-bottom: 16px;
  display: inline-block;
}
.privilege-title {
  font-family: var(--cn-serif);
  font-size: 24px; font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 6px; letter-spacing: 2px;
}
.privilege-en {
  font-family: var(--serif);
  font-size: 13px; font-style: italic;
  color: var(--gold-soft); opacity: 0.7;
  margin-bottom: 20px; letter-spacing: 1px;
}
.privilege-desc {
  font-family: var(--cn-serif);
  font-size: 14px; color: var(--text-secondary);
  line-height: 1.9; margin-bottom: 24px;
}
.privilege-list {
  list-style: none; padding: 0;
}
.privilege-list li {
  font-size: 13px; color: var(--text-muted);
  padding: 8px 0;
  border-top: 1px solid var(--border);
  position: relative; padding-left: 18px;
}
.privilege-list li::before {
  content: '◆'; position: absolute; left: 0;
  color: var(--gold); font-size: 10px;
}
.privilege-list li:first-child { border-top: none; }

/* ===== Members ===== */
.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 64px;
}
.member-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s;
}
.member-card:hover {
  border-color: var(--gold);
  background: var(--bg-card-hover);
}
.member-icon {
  font-size: 36px;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 16px rgba(201,168,106,0.3));
}
.member-title {
  font-family: var(--cn-serif);
  font-size: 18px; font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 8px; letter-spacing: 1px;
}
.member-desc {
  font-size: 13px; color: var(--text-muted);
  line-height: 1.7;
}

.quote-block {
  max-width: 720px; margin: 0 auto;
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, rgba(201,168,106,0.06), transparent);
  border: 1px solid var(--border);
  border-radius: 12px;
  position: relative;
}
.quote-mark {
  position: absolute; top: -10px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--serif);
  font-size: 96px; line-height: 1;
  color: var(--gold); opacity: 0.4;
}
.quote-text {
  font-family: var(--cn-serif);
  font-size: 22px; font-weight: 400;
  color: var(--text-primary);
  line-height: 1.8; margin: 24px 0;
}
.quote-author {
  font-size: 13px; color: var(--text-muted);
  letter-spacing: 2px;
}

/* ===== Join ===== */
.join { background: var(--bg-dark); }
.join-card {
  max-width: 920px; margin: 0 auto;
  background: linear-gradient(135deg, rgba(201,168,106,0.04), transparent);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 64px 48px;
  text-align: center;
}
.join-title {
  font-family: var(--cn-serif);
  font-size: 42px; font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 2px;
}
.join-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  margin: 56px 0;
}
.join-step {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.join-step-num {
  font-family: var(--serif);
  font-size: 36px; font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
}
.join-step-title {
  font-family: var(--cn-serif);
  font-size: 17px; font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 8px; letter-spacing: 1px;
}
.join-step-desc {
  font-size: 13px; color: var(--text-secondary);
  line-height: 1.7;
}
.join-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary, .btn-outline {
  display: inline-block; padding: 14px 32px;
  font-size: 14px; font-weight: 600;
  letter-spacing: 2px; text-decoration: none;
  border-radius: 4px; transition: all 0.3s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--bg-deep);
  border: 1px solid var(--gold);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(201,168,106,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--gold-bright);
  border: 1px solid var(--gold);
}
.btn-outline:hover {
  background: var(--gold);
  color: var(--bg-deep);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-brand .nav-logo { margin-bottom: 16px; }
.footer-tagline {
  font-family: var(--cn-serif);
  font-size: 14px; color: var(--text-muted);
  line-height: 1.8;
}
.footer-col h4 {
  font-family: var(--cn-serif);
  font-size: 14px; font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 16px; letter-spacing: 2px;
}
.footer-col ul { list-style: none; }
.footer-col li {
  font-size: 13px; color: var(--text-secondary);
  padding: 6px 0;
}
.footer-col a {
  color: var(--text-secondary); text-decoration: none;
  transition: color 0.3s;
}
.footer-col a:hover { color: var(--gold); }
.footer-qr { text-align: center; }
.footer-qrcode-wrap {
  display: inline-block;
  margin-bottom: 12px;
}
.footer-qrcode {
  width: 96px; height: 96px;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.footer-qr-text {
  font-size: 12px; color: var(--text-muted);
  letter-spacing: 1px;
}
.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.footer-bottom p {
  font-size: 12px; color: var(--text-muted);
  letter-spacing: 1px;
}

/* ===== Reveal Animation (progressive enhancement) ===== */
.reveal {
  opacity: 1; transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.js-loaded .reveal:not(.visible) { opacity: 0; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .nav-links { display: none; }
  .hero-title { font-size: 56px; letter-spacing: 4px; }
  .hero-tagline { font-size: 16px; }
  .core-card {
    grid-template-columns: 1fr; text-align: center;
    gap: 32px; padding: 40px 24px;
  }
  .core-icon-wrap { margin: 0 auto; width: 160px; height: 160px; }
  .whale-icon { font-size: 80px; }
  .core-highlights { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .core-feature { flex: 1 1 140px; justify-content: center; }
  .section-title { font-size: 32px; }
  .section { padding: 80px 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .join-card { padding: 40px 24px; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .join-cta { flex-direction: column; }
  .join-cta a { width: 100%; }
}