/* ==========================================================================
   响应式样式 - 移动端优先适配
   ========================================================================== */

/* 大屏桌面 */
@media (max-width: 1400px) {
  .nav-container { padding: 0 24px; }
  .logo-title, .logo-text .logo-divider, .logo-sub { font-size: 20px; }
  .logo-mark { font-size: 20px; }
  .logo-img { height: 44px; }
}

/* 中等桌面 */
@media (max-width: 1200px) {
  .container { padding: 0 20px; }
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 50px; }
  .stats-grid { padding: 40px 30px; gap: 20px; }
  .stat-num { font-size: 48px; }
  .stat-num em { font-size: 30px; }
  .about-grid { gap: 50px; }
  .founder-top { gap: 40px; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .members-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1.5fr; gap: 40px; }
  .methodology { padding: 40px 30px; }
}

/* 平板 */
@media (max-width: 1024px) {
  .nav-menu { display: none; }
  .nav-toggle { display: flex; }
  .header.menu-open .nav-menu {
    display: flex;
    position: absolute;
    top: 80px; left: 0; right: 0;
    background: rgba(10, 31, 68, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    gap: 0;
    border-top: 1px solid rgba(212, 175, 55, 0.2);
  }
  .header.menu-open .nav-link {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
  }
  .header.menu-open .nav-link::after { display: none; }

  .logo-text { gap: 6px; }
  .logo-title, .logo-text .logo-divider, .logo-sub { font-size: 16px; }
  .logo-fallback { gap: 6px; }
  .logo-mark { font-size: 18px; padding: 4px 8px; }

  .about-grid { grid-template-columns: 1fr; gap: 60px; }
  .about-media { max-width: 600px; margin: 0 auto; }
  .event-card { grid-template-columns: 1fr; gap: 40px; }
  .event-poster { max-width: 400px; margin: 0 auto; width: 100%; }
  .founder-top { grid-template-columns: 280px 1fr; gap: 40px; }
  .results-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .timeline { max-width: 700px; }
}

/* 移动端 */
@media (max-width: 768px) {
  body { font-size: 15px; }
  .container { padding: 0 16px; }
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 40px; }
  .section-eyebrow { font-size: 12px; letter-spacing: 0.2em; }
  .section-eyebrow::before, .section-eyebrow::after { display: none; }

  /* 导航 */
  .nav-container { height: 64px; padding: 0 16px; gap: 12px; }
  .logo-img { height: 36px; }
  .logo-fallback { gap: 4px; }
  .logo-mark { font-size: 14px; padding: 3px 6px; }
  .logo-text { gap: 4px; flex-direction: column; line-height: 1.1; }
  .logo-title, .logo-text .logo-divider, .logo-sub { font-size: 13px; }
  .logo-text .logo-divider { display: none; }
  .header.menu-open .nav-menu { top: 64px; }

  /* Banner */
  .banner { min-height: 92vh; padding: 100px 16px 60px; }
  .banner-tag { font-size: 12px; padding: 6px 16px; margin-bottom: 24px; letter-spacing: 0.2em; }
  .banner-tag::before, .banner-tag::after { display: none; }
  .banner-title { margin-bottom: 24px; }
  .banner-title-main { font-size: clamp(40px, 12vw, 64px); margin: 4px 0; }
  .banner-title-sub { font-size: 20px; letter-spacing: 0.15em; }
  .banner-date { font-size: 16px; padding: 8px 16px; }
  .banner-theme { font-size: 14px; gap: 8px; margin-bottom: 32px; letter-spacing: 0.1em; }
  .banner-actions { flex-direction: column; width: 100%; max-width: 280px; margin: 0 auto; }
  .banner-actions .btn { width: 100%; padding: 14px 20px; font-size: 15px; }
  .banner-scroll { display: none; }

  /* 数据 */
  .stats { padding: 40px 0; margin-top: -30px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; padding: 30px 20px; }
  .stat-item::after { display: none; }
  .stat-num { font-size: 36px; }
  .stat-num em { font-size: 24px; }
  .stat-num .stat-prefix { font-size: 20px; }
  .stat-label { font-size: 13px; }

  /* About */
  .about-img { aspect-ratio: 16/10; }
  .about-badge { width: 100px; height: 100px; bottom: -20px; right: -10px; }
  .about-badge span { font-size: 24px; }
  .about-badge small { font-size: 10px; }
  .about-lead { font-size: 16px !important; }
  .about-features { grid-template-columns: 1fr; gap: 8px; }

  /* Event */
  .event-poster { padding: 30px 24px; aspect-ratio: 4/5; }
  .event-name { font-size: 30px; }
  .event-city { font-size: 16px; }
  .event-theme { font-size: 16px; }
  .event-meta { grid-template-columns: 1fr; gap: 16px; padding-bottom: 24px; margin-bottom: 24px; }
  .event-meta-val { font-size: 16px; }
  .countdown { gap: 10px; }
  .cd-block { padding: 16px 8px; }
  .cd-num { font-size: 32px; }
  .cd-label { font-size: 12px; }
  .event-actions { flex-direction: column; }
  .event-actions .btn { width: 100%; }

  /* Founder */
  .founder-top { grid-template-columns: 1fr; gap: 30px; }
  .founder-photo { max-width: 280px; margin: 0 auto; }
  .founder-photo-frame { top: 12px; left: 12px; right: -12px; bottom: -12px; }
  .founder-name { font-size: 40px; }
  .founder-info { text-align: center; }
  .founder-tags { justify-content: center; }
  .founder-points p { padding-left: 12px; }
  .founder-points p b { display: block; margin-bottom: 4px; }
  .results-grid { grid-template-columns: 1fr; gap: 16px; }
  .result-card { padding: 24px 20px; }
  .methodology { padding: 30px 20px; }
  .methodology-title { font-size: 22px; }
  .methodology-flow { flex-direction: column; }
  .mf-arrow { transform: rotate(90deg); font-size: 20px; }
  .mf-step { min-width: 100%; }

  /* Team */
  .team-grid { grid-template-columns: 1fr; gap: 20px; }
  .team-body { padding: 24px 20px; }
  .team-body h3 { font-size: 22px; }

  /* History */
  .timeline { padding: 20px 0 20px 20px; }
  .tl-line { left: 8px; }
  .tl-item {
    width: 100%;
    padding-left: 36px !important;
    padding-right: 0 !important;
    margin-left: 0 !important;
    justify-content: flex-start !important;
  }
  .tl-item .tl-dot { left: 0 !important; right: auto !important; }
  .tl-card-body { padding: 18px 18px 20px; }
  .tl-card h4 { font-size: 16px; }
  .tl-card p { font-size: 13px; }

  /* Members */
  .members-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .member-card { padding: 18px 14px; }
  .m-mark { width: 40px; height: 40px; font-size: 22px; }
  .member-card h4 { font-size: 13px; min-height: 36px; }
  .m-tag { font-size: 11px; }
  .m-desc { font-size: 11px; min-height: 50px; -webkit-line-clamp: 2; }

  /* Contact */
  .contact-form-wrap { padding: 24px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-row .form-field { margin-bottom: 14px; }
  .form-title { font-size: 20px; }
  .ci-card { padding: 18px 14px; gap: 12px; }
  .ci-card-ico { width: 42px; height: 42px; }
  .ci-card-ico svg { width: 20px; height: 20px; }
  .ci-card-text { font-size: 13px; }
  .ci-card-tip { font-size: 10px; }
  .form-corner { width: 18px; height: 18px; }
  .form-corner--tl, .form-corner--tr { top: 10px; }
  .form-corner--bl, .form-corner--br { bottom: 10px; }
  .form-corner--tl, .form-corner--bl { left: 10px; }
  .form-corner--tr, .form-corner--br { right: 10px; }
  .form-footer { flex-direction: column; align-items: flex-start; }

  /* Footer */
  .footer { padding: 40px 0 20px; }
  .footer-links { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-bottom { font-size: 11px; }
  .footer-bottom p { padding: 0 8px; }

  /* 浮动元素 */
  .float-cta {
    right: 16px;
    bottom: 80px;
    padding: 12px 18px;
    font-size: 13px;
  }
  .float-cta::before { display: none; }
  .back-top {
    right: 16px;
    bottom: 24px;
    width: 42px;
    height: 42px;
    font-size: 18px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .logo-text { display: none !important; }
  .banner-title-main { letter-spacing: 0.05em; }
  .cd-num { font-size: 28px; }
  .cd-block { padding: 12px 4px; }
  .cd-label { font-size: 11px; }
  .event-name { font-size: 24px; }
  .event-theme { font-size: 14px; }
  .founder-name { font-size: 32px; }
  .members-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
}

/* 大屏优化 */
@media (min-width: 1600px) {
  .banner { padding: 140px 24px 100px; }
  .banner-title-main { font-size: 130px; }
  .stat-num { font-size: 64px; }
}