/* ================================================================
   Duobridge — global stylesheet
   Dark, editorial, Anthropic-inspired. Gradient accents from brand logo:
   mint #4BF0C8 → periwinkle #7BA6FF
   ================================================================ */

:root {
  --bg: #080809;
  --bg-raise: #101012;
  --bg-tint: #0c0c0e;
  --ink: #ffffff;
  --ink-soft: #e8e6e0;
  --muted: #c5c3bb;
  --line: rgba(242, 240, 234, 0.16);
  --line-strong: rgba(242, 240, 234, 0.3);
  --mint: #4bf0c8;
  --peri: #7ba6ff;
  --grad: linear-gradient(92deg, #4bf0c8 0%, #7ba6ff 100%);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --radius: 14px;
  --radius-lg: 20px;
  --container: 1160px;
  --pad: clamp(20px, 5vw, 48px);
}

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

html {
  scroll-behavior: smooth;
  /* iOS Safari 横屏 / 动态字体默认会放大正文，锁住以免布局错乱 */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
a, button { touch-action: manipulation; }

/* 固定导航高 72px，锚点跳转时给标题留出空间 */
section[id] { scroll-margin-top: 88px; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

::selection { background: rgba(75, 240, 200, 0.28); color: #fff; }

/* focus visibility for keyboard users */
:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------------- typography helpers ---------------- */

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 18px;
}

.section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.section-sub {
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 17px;
  max-width: 640px;
}

.itinerary-note { color: var(--muted); font-size: 15px; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------- buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 500;
  min-height: 44px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--ink);
  color: #0b0b0c;
}
.btn-primary:hover { box-shadow: 0 6px 24px rgba(242, 240, 234, 0.18); }

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--ink);
  background: transparent;
}
.btn-ghost:hover { border-color: rgba(242, 240, 234, 0.36); background: rgba(242, 240, 234, 0.04); }

.btn-wide { width: 100%; }
.btn-small { padding: 8px 16px; font-size: 13px; }

/* ---------------- header ---------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.25s ease, border-color 0.25s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(11, 11, 12, 0.78);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo { height: 30px; width: auto; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}
.site-nav > a:not(.nav-cta) {
  font-size: 14.5px;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.site-nav > a:not(.nav-cta):hover { color: var(--ink); }

/* ---------------- nav dropdowns ---------------- */

.nav-drop { position: relative; }

.nav-drop-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
  background: none;
  border: 0;
  padding: 8px 0;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.nav-drop-btn .caret { transition: transform 0.18s ease; opacity: 0.7; }
.nav-drop:hover .nav-drop-btn,
.nav-drop:focus-within .nav-drop-btn { color: var(--mint); }
.nav-drop:hover .caret,
.nav-drop:focus-within .caret { transform: rotate(180deg); }

.nav-drop-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translate(-50%, 6px);
  min-width: 240px;
  background: var(--bg-raise);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  z-index: 120;
}
/* 含视频预览的菜单：左侧列表 + 右侧画面 */
.nav-drop-menu--preview {
  width: 660px;
  left: auto;
  right: 0;
  transform: translate(0, 6px);
}
.nav-drop:hover .nav-drop-menu,
.nav-drop:focus-within .nav-drop-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.nav-drop:hover .nav-drop-menu--preview,
.nav-drop:focus-within .nav-drop-menu--preview {
  transform: translate(0, 0);
}

.nav-drop-body { display: flex; gap: 10px; align-items: stretch; }

.nav-drop-list { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 2px; }

.nav-drop-preview {
  position: relative;
  flex: 0 0 300px;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  background: #000 center / cover no-repeat;
  border: 1px solid var(--line);
}
.nav-drop-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.nav-drop-video.is-playing { opacity: 1; }
.nav-drop-preview-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 28px 12px 10px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.78), transparent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  pointer-events: none;
}
/* 无视频时：封面图缓慢推拉的“伪动态”占位 */
.nav-drop-preview.is-static {
  background-size: 108%;
  transition: background-size 6s ease;
}
.nav-drop-preview.is-static.is-zoom { background-size: 116%; }
/* 隐形衔接条，防止鼠标移向菜单时悬停中断 */
.nav-drop-menu::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}

.nav-drop-item {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.14s ease, color 0.14s ease;
}
.nav-drop-item:hover,
.nav-drop-item:focus-visible {
  background: rgba(242, 240, 234, 0.07);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(3.75px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { transform: translateY(-3.75px) rotate(-45deg); }

/* ---------------- hero ---------------- */

.hero {
  position: relative;
  min-height: 100vh;      /* 旧版 Edge 不支持 svh 时的兜底 */
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* 纯 CSS 静态星空：不依赖 canvas、JS 或「减少动画」偏好。
   Edge / 远程桌面 / 禁用 2D 上下文时仍能保证首屏视觉存在。 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-repeat: no-repeat;
  background-image:
    radial-gradient(2px 2px at 7% 12%, rgba(123, 166, 255, .85), transparent 62%),
    radial-gradient(1.5px 1.5px at 17% 46%, rgba(75, 240, 200, .8), transparent 62%),
    radial-gradient(2px 2px at 24% 78%, rgba(123, 166, 255, .7), transparent 62%),
    radial-gradient(1.5px 1.5px at 31% 22%, rgba(75, 240, 200, .75), transparent 62%),
    radial-gradient(2px 2px at 38% 62%, rgba(123, 166, 255, .8), transparent 62%),
    radial-gradient(1.5px 1.5px at 45% 9%, rgba(75, 240, 200, .7), transparent 62%),
    radial-gradient(2px 2px at 52% 88%, rgba(123, 166, 255, .75), transparent 62%),
    radial-gradient(1.5px 1.5px at 59% 34%, rgba(75, 240, 200, .8), transparent 62%),
    radial-gradient(2px 2px at 66% 70%, rgba(123, 166, 255, .7), transparent 62%),
    radial-gradient(1.5px 1.5px at 73% 15%, rgba(75, 240, 200, .75), transparent 62%),
    radial-gradient(2px 2px at 81% 54%, rgba(123, 166, 255, .8), transparent 62%),
    radial-gradient(1.5px 1.5px at 88% 26%, rgba(75, 240, 200, .7), transparent 62%),
    radial-gradient(2px 2px at 94% 82%, rgba(123, 166, 255, .75), transparent 62%),
    radial-gradient(1.5px 1.5px at 12% 92%, rgba(75, 240, 200, .65), transparent 62%),
    radial-gradient(2px 2px at 42% 38%, rgba(123, 166, 255, .6), transparent 62%),
    radial-gradient(1.5px 1.5px at 69% 94%, rgba(75, 240, 200, .65), transparent 62%),
    radial-gradient(2px 2px at 91% 8%, rgba(123, 166, 255, .7), transparent 62%),
    radial-gradient(1.5px 1.5px at 3% 63%, rgba(75, 240, 200, .6), transparent 62%);
  opacity: .8;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-glow {
  position: absolute;
  width: 60vw;
  height: 60vw;
  max-width: 860px;
  max-height: 860px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.16;
  pointer-events: none;
}
.hero-glow-a { background: radial-gradient(circle, #4bf0c8 0%, transparent 65%); top: -18%; left: -12%; animation: driftA 16s ease-in-out infinite alternate; }
.hero-glow-b { background: radial-gradient(circle, #7ba6ff 0%, transparent 65%); bottom: -22%; right: -10%; animation: driftB 20s ease-in-out infinite alternate; }

@keyframes driftA { from { transform: translate(0, 0) scale(1); } to { transform: translate(6vw, 4vw) scale(1.12); } }
@keyframes driftB { from { transform: translate(0, 0) scale(1.08); } to { transform: translate(-5vw, -4vw) scale(1); } }

.hero-inner { position: relative; z-index: 2; width: 100%; padding-top: 90px; }

.hero-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(40px, 7vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  max-width: 15ch;
}

.hero-sub {
  margin-top: 26px;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--ink-soft);
  max-width: 52ch;
}

.hero-actions {
  margin-top: 40px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero-scroll-hint span {
  display: block;
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, transparent, var(--ink-soft));
  animation: scrollHint 2.2s ease-in-out infinite;
}
@keyframes scrollHint {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------------- sections ---------------- */

.section { padding: clamp(76px, 10vw, 130px) 0; }
.section-tinted {
  background: var(--bg-tint);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head { margin-bottom: clamp(44px, 6vw, 72px); max-width: 760px; }

/* ---------------- pillars ---------------- */

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pillar-card {
  background: var(--bg);
  padding: clamp(28px, 4vw, 48px);
  transition: background 0.25s ease;
  position: relative;
}
.pillar-card:hover { background: var(--bg-raise); }

.pillar-no {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 26px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.pillar-no::after {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--grad);
}

.pillar-card h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(21px, 2.4vw, 26px);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.pillar-card p { color: var(--muted); font-size: 15.5px; line-height: 1.7; }

/* ---------------- itinerary timeline ---------------- */

.timeline { position: relative; }

.timeline::before {
  content: "";
  position: absolute;
  left: 95px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--line-strong) 6%, var(--line-strong) 94%, transparent);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 38px;
  padding: 22px 0;
}

.timeline-marker { text-align: right; padding-top: 3px; }

.timeline-day {
  display: block;
  font-family: var(--serif);
  font-size: 18px;
}

.timeline-city {
  display: inline-block;
  margin-top: 7px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px 10px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 95px;
  top: 34px;
  width: 9px;
  height: 9px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 12px rgba(75, 240, 200, 0.5);
}

.timeline-body { padding-left: 26px; }

.timeline-body li {
  position: relative;
  color: var(--ink-soft);
  font-size: 15.5px;
  padding: 4px 0 4px 20px;
}
.timeline-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 1px;
  background: var(--muted);
}

.itinerary-cta {
  margin-top: clamp(40px, 6vw, 64px);
  padding: clamp(28px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  background: rgba(242, 240, 234, 0.02);
}
.itinerary-cta p { font-family: var(--serif); font-size: 19px; color: var(--ink-soft); }

/* ---------------- gallery ---------------- */

.gallery-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 22px;
  align-items: stretch;
}

.gallery-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-raise);
  display: flex;
  flex-direction: column;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  min-height: 280px;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.gallery-item:hover img { transform: scale(1.025); }

.gallery-item figcaption {
  padding: 16px 20px;
  font-size: 13.5px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------------- partners marquee ---------------- */

.partners-band { padding-top: 84px; padding-bottom: 72px; }
.partners-head { text-align: left; margin-bottom: 48px; }
.partners-head .section-title { margin-inline: 0; }

.marquee {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-bottom: 4px;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}

.marquee-track {
  display: flex;
  gap: 16px;
  width: max-content;
  animation: marquee 60s linear infinite;
}
.marquee-track.marquee-reverse { animation-direction: reverse; animation-duration: 70s; }
.marquee:hover .marquee-track { animation-play-state: paused; }

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.partner-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 30px;
  background: rgba(242, 240, 234, 0.02);
  min-width: 150px;
  white-space: nowrap;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.partner-chip:hover { border-color: rgba(75, 240, 200, 0.4); background: rgba(242, 240, 234, 0.045); }
.partner-chip a { display: inline-flex; align-items: center; }

.partner-chip img {
  height: 30px;
  width: auto;
  max-width: 190px;
  object-fit: contain;
  opacity: 0.88;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.partner-chip a:hover img { opacity: 1; transform: translateY(-1px); }

.partner-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
}

/* ---------------- about ---------------- */

.about-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: start;
}

.about-body {
  margin: 24px 0 34px;
  color: var(--ink-soft);
  font-size: 17px;
  max-width: 56ch;
}

.about-values { display: flex; flex-direction: column; }

.value-item {
  display: flex;
  gap: 22px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.value-item:last-child { border-bottom: 1px solid var(--line); }

.value-num {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--muted);
  padding-top: 4px;
}

.value-item h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 20px;
  margin-bottom: 6px;
}
.value-item p { color: var(--muted); font-size: 14.5px; }

/* ---------------- contact ---------------- */

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(40px, 6vw, 90px);
  align-items: start;
}

.contact-lead { margin: 22px 0 34px; color: var(--ink-soft); max-width: 46ch; }

.contact-meta { display: flex; flex-direction: column; gap: 14px; }
.contact-meta li { display: flex; gap: 16px; align-items: baseline; font-size: 15.5px; }

.meta-label {
  flex: none;
  width: 76px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.contact-meta a { border-bottom: 1px solid var(--line-strong); transition: border-color 0.15s; }
.contact-meta a:hover { border-color: var(--mint); }

.contact-socials, .footer-socials { display: flex; gap: 18px; margin-top: 8px; }
.contact-socials a, .footer-socials a {
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.contact-socials a:hover, .footer-socials a:hover { color: var(--mint); border-color: rgba(75, 240, 200, 0.5); }

.contact-form {
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(26px, 4vw, 40px);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.form-field { margin-bottom: 18px; }

.form-field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.form-field label span { color: var(--mint); }

.form-field input,
.form-field textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  color: var(--ink);
  font-family: var(--sans);
  /* 必须 ≥16px：iOS Safari 对更小的输入框会在聚焦时自动缩放整页 */
  font-size: 16px;
  padding: 12px 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: rgba(191, 189, 181, 0.65); }

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: rgba(75, 240, 200, 0.55);
  box-shadow: 0 0 0 3px rgba(75, 240, 200, 0.12);
}

.form-field textarea { resize: vertical; min-height: 120px; }

.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

.form-status { margin-top: 14px; font-size: 14px; min-height: 20px; }
.form-status.ok { color: var(--mint); }
.form-status.err { color: #ff8f8f; }

/* ---------------- footer ---------------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: #090909;
  padding-top: clamp(48px, 6vw, 72px);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(36px, 6vw, 80px);
  padding-bottom: 48px;
}

.footer-brand img { height: 28px; width: auto; margin-bottom: 18px; }
.footer-note { color: var(--muted); font-size: 14px; max-width: 40ch; }

.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.footer-col-title {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14.5px;
  color: var(--ink-soft);
  padding: 5px 0;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--ink); }
.footer-col .footer-socials { flex-direction: row; flex-wrap: wrap; margin-bottom: 6px; }
.footer-col .footer-socials a { padding: 5px 0; }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 22px;
  padding-bottom: 26px;
}
.footer-bottom p { font-size: 13px; color: var(--muted); }

/* ---------------- cookie bar ---------------- */

.cookie-bar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 18px;
  background: rgba(19, 19, 21, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 10px 12px 10px 24px;
  max-width: min(92vw, 620px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}
.cookie-bar[hidden] { display: none; }
.cookie-bar p { font-size: 13.5px; color: var(--ink-soft); }

/* ---------------- reveal animation ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------------- responsive ---------------- */

@media (max-width: 960px) {
  .pillar-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .about-inner, .contact-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .timeline::before { left: 74px; }
  .timeline-item { grid-template-columns: 60px 1fr; gap: 26px; }
  .timeline-item::before { left: 74px; }
  .timeline-marker { text-align: left; }
  .timeline-day { font-size: 15px; }
  .timeline-city { margin-top: 3px; }
  .timeline-body { padding-left: 16px; }
}

@media (max-width: 760px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: rgba(11, 11, 12, 0.97);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 12px var(--pad) 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease;
  }
  .site-nav.open { opacity: 1; transform: none; pointer-events: auto; }
  .site-nav > a { padding: 12px 0; font-size: 17px; width: 100%; }
  .nav-cta { margin-top: 10px; justify-content: center; }

  /* 移动端：下拉菜单常驻展开为分组列表 */
  .nav-drop { width: 100%; }
  .nav-drop-btn { padding: 12px 0; font-size: 17px; width: 100%; justify-content: space-between; }
  .nav-drop-btn .caret { display: none; }
  .nav-drop-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    min-width: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    padding: 0 0 8px 14px;
  }
  .nav-drop-menu::before { display: none; }
  .nav-drop-item { padding: 9px 12px; font-size: 15px; color: var(--muted); }

  /* 移动端隐藏视频预览，只保留列表 */
  .nav-drop-menu--preview { width: auto; left: auto; right: auto; transform: none; }
  .nav-drop-preview { display: none; }

  .form-row { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1 1 auto; }
  .itinerary-cta { flex-direction: column; align-items: flex-start; }
  .cookie-bar { flex-direction: column; border-radius: 18px; text-align: center; padding: 18px 20px; }
}

/* ---------------- reduced motion ---------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-glow-a, .hero-glow-b, .hero-scroll-hint span, .marquee-track { animation: none !important; }
  .marquee-track { flex-wrap: wrap; width: 100%; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .gallery-item img { transition: none; }
}

/* ---------------- brand film ---------------- */
.film-frame {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-raise);
}
.film-player { position: relative; aspect-ratio: 16 / 9; background: #000; }
.film-video { display: block; width: 100%; height: 100%; object-fit: cover; background: #000; }
.film-cover {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  width: 100%; padding: 24px; border: 0; cursor: pointer;
  background: #000 url("/assets/img/duobridge-film-poster.jpg") center / cover no-repeat;
  color: var(--ink); font: inherit; text-align: center;
}
.film-cover::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8,8,9,.35) 0%, rgba(8,8,9,.12) 42%, rgba(8,8,9,.72) 100%);
}
.film-cover-inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; }
.film-play {
  display: grid; place-items: center;
  width: 92px; height: 92px; margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,.55); border-radius: 50%;
  background: rgba(8,8,9,.38); color: var(--ink);
  backdrop-filter: blur(8px);
  transition: transform .25s ease, background .25s ease, border-color .25s ease;
}
.film-play svg { margin-left: 5px; }
.film-cover:hover .film-play, .film-cover:focus-visible .film-play {
  transform: scale(1.08); background: rgba(75,240,200,.20); border-color: var(--mint);
}
.film-cover:focus-visible { outline: 2px solid var(--mint); outline-offset: -4px; }
.film-cover-label {
  font-family: var(--sans); font-size: 12px; font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft);
}
.film-cover-title {
  margin-top: 12px; font-family: var(--serif);
  font-size: clamp(20px, 2.5vw, 32px); line-height: 1.25; color: var(--ink);
  text-shadow: 0 2px 20px rgba(0,0,0,.85), 0 1px 4px rgba(0,0,0,.7);
}
.film-frame figcaption {
  padding: 16px 22px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13.5px;
}
.film-player.is-playing .film-cover { display: none; }

@media (max-width: 760px) {
  .film-play { width: 66px; height: 66px; margin-bottom: 16px; }
  .film-cover-title { display: none; }
  .film-cover-label { font-size: 11px; }
  .film-frame figcaption { padding: 14px 16px; font-size: 12.5px; }
}
@media (prefers-reduced-motion: reduce) {
  .film-play { transition: none; }
}

/* ================================================================
   Touch / iOS adaptation — appended overrides.
   Desktop rules are left intact; everything below wins by source order.
   ================================================================ */

/* Inline preview cards only exist in the touch layout. */
.mobile-preview { display: none; }
.mobile-preview[hidden] { display: none !important; }

/* iOS Safari fakes :hover and leaves it "stuck" after a tap. On devices
   without a real pointer, neutralise those states and let JS classes do
   the work instead. */
@media (hover: none) {
  .btn:hover { transform: none; }
  .pillar-card:hover { background: var(--bg); }
  .gallery-item:hover img { transform: none; }
  .partner-chip:hover { border-color: var(--line); background: rgba(242, 240, 234, 0.02); }
  .partner-chip a:hover img { opacity: 0.88; transform: none; }
  .contact-meta a:hover { border-color: var(--line-strong); }
  .film-cover:hover .film-play {
    transform: none; background: rgba(8, 8, 9, 0.38); border-color: rgba(255, 255, 255, 0.55);
  }
  .nav-drop-item:hover { background: transparent; color: var(--muted); }
  .nav-drop:hover .nav-drop-btn,
  .nav-drop:focus-within .nav-drop-btn { color: var(--ink); }
  .nav-drop:hover .caret,
  .nav-drop:focus-within .caret { transform: none; }
}

/* Only wide touch screens (iPad / touch laptops) need the hover-state
   override; phone layouts are driven entirely by .open / .tap-open classes. */
@media (hover: none) and (min-width: 761px) {
  .nav-drop:hover .nav-drop-menu,
  .nav-drop:focus-within .nav-drop-menu { opacity: 0; visibility: hidden; }
  .nav-drop.tap-open .nav-drop-menu { opacity: 1; visibility: visible; }
}

@media (max-width: 760px) {
  /* ---------- safe areas: notch / Dynamic Island / Home indicator ---------- */
  .site-header { padding-top: env(safe-area-inset-top); }
  .header-inner { height: 72px; }
  .container {
    padding-left: max(var(--pad), calc(env(safe-area-inset-left) + 16px));
    padding-right: max(var(--pad), calc(env(safe-area-inset-right) + 16px));
  }
  .footer-bottom { padding-bottom: calc(26px + env(safe-area-inset-bottom)); }
  .cookie-bar {
    bottom: calc(16px + env(safe-area-inset-bottom));
    max-width: calc(100vw - 32px);
  }
  section[id] { scroll-margin-top: calc(72px + env(safe-area-inset-top) + 12px); }

  /* ---------- menu: scrollable, collapsible, Apple-sized tap targets ---------- */
  body.nav-open { overflow: hidden; }
  /* 菜单展开时不要让 cookie 提示挡住列表 */
  body.nav-open .cookie-bar { display: none; }
  .site-nav {
    top: calc(72px + env(safe-area-inset-top));
    max-height: calc(100vh - 72px - env(safe-area-inset-top));
    max-height: calc(100dvh - 72px - env(safe-area-inset-top));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }
  .nav-toggle {
    min-width: 44px; min-height: 44px; padding: 12px;
    margin-right: -10px; align-items: center; justify-content: center;
  }
  .site-nav > a { display: flex; align-items: center; min-height: 48px; padding: 12px 0; }
  .nav-drop-btn { min-height: 48px; padding: 13px 0; }
  .nav-drop-btn .caret { display: block; }
  .nav-drop:hover .caret,
  .nav-drop:focus-within .caret { transform: none; }
  .nav-drop.open .nav-drop-btn,
  .nav-drop.tap-open .nav-drop-btn,
  .nav-drop.open:hover .nav-drop-btn,
  .nav-drop.open:focus-within .nav-drop-btn { color: var(--mint); }
  .nav-drop.open .caret,
  .nav-drop.tap-open .caret { transform: rotate(180deg); }

  /* Collapse the two topic groups instead of dumping 12 links on screen. */
  .nav-drop-menu { display: none; }
  .nav-drop.open .nav-drop-menu,
  .nav-drop.tap-open .nav-drop-menu { display: block; }
  .nav-drop:hover .nav-drop-menu,
  .nav-drop:focus-within .nav-drop-menu { opacity: 1; visibility: visible; transform: none; }
  .nav-drop-body { flex-direction: column; gap: 8px; }
  .nav-drop-list { width: 100%; }
  .nav-drop-preview { display: none; }
  .nav-drop-item {
    display: flex; align-items: center; justify-content: space-between;
    min-height: 46px; padding: 11px 12px; font-size: 15.5px;
  }
  .nav-drop-item::after { content: "\25B6"; font-size: 9px; color: var(--mint); opacity: 0.85; }
  .nav-drop-item.is-active { background: rgba(75, 240, 200, 0.1); color: var(--ink); }
  .nav-drop-item.is-active::after { content: "\25A0"; font-size: 10px; }

  /* ---------- tap-to-play inline video preview ---------- */
  .mobile-preview { display: block; order: -1; margin: 2px 0 6px; }
  .mobile-preview-frame {
    position: relative; aspect-ratio: 16 / 9;
    border-radius: 10px; overflow: hidden;
    background: #000; border: 1px solid var(--line);
  }
  .mobile-preview-video { width: 100%; height: 100%; object-fit: cover; display: block; }
  .mobile-preview-badge {
    position: absolute; top: 8px; left: 8px;
    padding: 3px 9px; border-radius: 999px;
    background: rgba(8, 8, 9, 0.72); color: var(--mint);
    font-size: 10px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
    pointer-events: none;
  }
  .mobile-preview-bar {
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px; padding: 8px 2px 2px;
  }
  .mobile-preview-title { font-size: 13px; color: var(--ink-soft); }
  .mobile-preview-cta {
    font-size: 13px; font-weight: 600; color: var(--mint);
    min-height: 34px; display: inline-flex; align-items: center; white-space: nowrap;
  }

  /* ---------- hero: lighter effects, roomier type ---------- */
  .hero-inner { padding-top: 84px; padding-bottom: 56px; }
  .hero-title { font-size: clamp(33px, 9.2vw, 48px); max-width: 100%; line-height: 1.12; }
  .hero-actions { margin-top: 30px; gap: 10px; }
  .hero-actions .btn {
    flex: 1 1 45%; min-width: 0; padding: 12px 14px;
    white-space: normal; line-height: 1.3;
  }
  .hero-glow { width: 70vw; height: 70vw; filter: blur(52px); opacity: 0.12; }
  .hero-glow-a, .hero-glow-b { animation: none; }
  .hero-scroll-hint { display: none; }

  /* ---------- general typography ---------- */
  .section { padding: 66px 0; }
  .section-head { margin-bottom: 36px; }
  .section-title { font-size: clamp(26px, 7.2vw, 34px); }
  .section-sub { font-size: 15.5px; margin-top: 14px; }
  .eyebrow { font-size: 11px; margin-bottom: 12px; }
  .pillar-card { padding: 26px 22px; }
  .pillar-no { margin-bottom: 16px; }
  .pillar-card h3 { font-size: 21px; }
  .pillar-card p { font-size: 15px; }

  /* ---------- itinerary: day on top, full-width body ---------- */
  .timeline::before { left: 4px; top: 8px; bottom: 8px; }
  .timeline-item { grid-template-columns: 1fr; gap: 10px; padding: 16px 0 20px 22px; }
  .timeline-item::before { left: 4px; top: 24px; }
  .timeline-marker { display: flex; align-items: baseline; flex-wrap: wrap; gap: 10px; text-align: left; }
  .timeline-day { font-size: 16px; }
  .timeline-city { margin-top: 0; }
  .timeline-body { padding-left: 0; }
  .timeline-body li { font-size: 15px; padding: 3px 0 3px 16px; }
  .timeline-body li::before { top: 14px; width: 5px; }
  .itinerary-cta p { font-size: 17px; }
  .itinerary-note { font-size: 13px; }

  /* ---------- gallery / partners / footer / form ---------- */
  .gallery-item img { min-height: 0; aspect-ratio: 4 / 3; }
  .gallery-item figcaption { padding: 13px 16px; font-size: 12.5px; }
  .partners-band { padding-top: 64px; padding-bottom: 56px; }
  .partner-chip { padding: 12px 18px; min-width: 118px; }
  .partner-chip img { height: 26px; max-width: 140px; }
  .marquee-track { animation-duration: 90s; }
  .about-body { font-size: 15.5px; }
  .value-item { gap: 16px; padding: 20px 0; }
  .contact-form { padding: 22px 18px; }
  .contact-meta li { flex-direction: column; gap: 3px; }
  .contact-socials a, .footer-socials a { min-height: 36px; display: inline-flex; align-items: center; }
  .footer-inner { padding-bottom: 36px; }
  .footer-nav { grid-template-columns: 1fr 1fr; gap: 20px; }
  .footer-col a, .footer-col .footer-socials a { padding: 9px 0; }

  /* ---------- brand film cover ---------- */
  .film-cover { padding: 16px; }
  .film-play { width: 62px; height: 62px; margin-bottom: 14px; }
  .film-play svg { width: 20px; height: 24px; }
  .film-cover-label { font-size: 10.5px; }
  .film-frame figcaption { padding: 13px 16px; font-size: 12px; }
  .cookie-bar { gap: 10px; padding: 14px 16px; border-radius: 16px; }
  .cookie-bar p { font-size: 12.5px; line-height: 1.5; }
  .cookie-bar .btn { padding: 8px 20px; }
}

@media (max-width: 390px) {
  .hero-title { font-size: clamp(30px, 8.6vw, 36px); }
  .hero-actions .btn { flex: 1 1 100%; }
  .section-title { font-size: 26px; }
  .footer-nav { gap: 14px; }
}

@media (max-height: 480px) and (orientation: landscape) {
  .hero { min-height: 420px; }
  .hero-inner { padding-top: 78px; padding-bottom: 28px; }
  .hero-title { font-size: clamp(28px, 5.4vw, 38px); }
  .site-nav { max-height: calc(100dvh - 72px - env(safe-area-inset-top)); }
}