/* =========================================================
   清美未来 · 品牌设计官网
   设计系统 / Design System
   风格：简约大气 · 留白 · 克制的高级感
   ========================================================= */

:root {
  /* 色彩 */
  --ink: #16130f;          /* 主文字 近墨黑 */
  --ink-soft: #4a453e;     /* 次级文字 */
  --muted: #8a847a;        /* 辅助/说明文字 */
  --line: #e7e3dc;         /* 分割线 */
  --bg: #ffffff;           /* 主背景 */
  --bg-warm: #f7f5f1;      /* 暖白背景 */
  --bg-dark: #16130f;      /* 深色区块 */
  --accent: #9a7b4f;       /* 青铜金 强调色 */
  --accent-soft: #c9a063;  /* 浅金 */

  /* 字体（苹果风：SF Pro / 苹方 无衬线主导） */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", Georgia, serif;

  /* 间距与圆角 */
  --radius: 14px;
  --maxw: 1600px;
  --gut: 24px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

p { margin: 0; }

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

ul { margin: 0; padding: 0; list-style: none; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gut);
}

.section { padding: 50px 0px 0px 0px; }
.page-index .section { padding: 50px 0px 50px 0px; }
.section--warm { background: var(--bg-warm); }
.section--dark { background: var(--bg-dark); color: #f3efe8; }

.section-head { max-width: 760px; margin-bottom: 72px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.section-head h2 {
  font-size: clamp(34px, 5.2vw, 60px);
  letter-spacing: -0.025em;
  line-height: 1.08;
}
.section-head p {
  margin-top: 22px;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.6;
}
.section--dark .section-head p { color: #b7b1a6; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 15px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  border-radius: 980px;
  transition: all 0.4s var(--ease);
}
.btn:hover { background: var(--ink); color: #fff; }
.btn--accent { border-color: var(--accent); color: var(--accent); }
.btn--accent:hover { background: var(--accent); color: #fff; }
.btn--light { border-color: #f3efe8; color: #f3efe8; }
.btn--light:hover { background: #f3efe8; color: var(--ink); }
.btn--solid { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn--solid:hover { background: var(--accent); border-color: var(--accent); }
.btn .arrow { transition: transform 0.4s var(--ease); }
.btn:hover .arrow { transform: translateX(5px); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 600;
}
.brand .logo-mark {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.04em;
}
.brand .logo-sub {
  font-size: 22px;
  letter-spacing: 0px;
  color: var(--muted);
  text-transform: uppercase;
}

.nav-links { display: flex; gap: 38px; }
.nav-links > a,
.nav-links > .nav-item > .nav-trigger {
  position: relative;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  padding: 6px 0;
  transition: color 0.3s var(--ease);
}
.nav-links > a::after,
.nav-links > .nav-item > .nav-trigger::after {
  display: none;
}
.nav-links > a:hover,
.nav-links > a.active,
.nav-links > .nav-item > .nav-trigger:hover,
.nav-links > .nav-item > .nav-trigger.active { color: var(--ink); }

.nav-cta { display: flex; align-items: center; gap: 18px; }
.nav-cta .btn { font-size: 14px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

/* ---------- 导航项（顶层链接） ---------- */
.nav-item { position: relative; display: flex; align-items: center; }
.nav-trigger { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; background: none; border: 0; font: inherit; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 76px;
  background:
    radial-gradient(120% 120% at 85% 10%, #fbf8f3 0%, #ffffff 55%),
    var(--bg);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -10%; right: -8%;
  width: 46vw; height: 46vw;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: 0.7;
}
.hero::after {
  content: "";
  position: absolute;
  top: 18%; right: 6%;
  width: 30vw; height: 30vw;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: 0.5;
}
.hero-inner { position: relative; z-index: 2; max-width: 860px; }

/* 预览页 hero 黑色背景 */
#previewHero {
  background: #0a0a0a;
}
#previewHero::before,
#previewHero::after {
  display: none;
}
#previewHero .eyebrow,
#previewHero h1,
#previewHero .lead {
  color: #e9e3d8;
}
.hero .eyebrow {
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(46px, 7.6vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 600;
}
.hero h1 .light { color: var(--muted); font-weight: 400; }
.hero .lead {
  margin-top: 30px;
  font-size: clamp(16px, 2vw, 20px);
  color: var(--ink-soft);
  max-width: 600px;
}
.hero-actions { margin-top: 44px; display: flex; gap: 16px; flex-wrap: wrap; }

.hero-meta {
  position: absolute;
  left: var(--gut); bottom: 40px;
  display: flex;
  gap: 48px;
  z-index: 2;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.hero-meta .item .num {
  font-family: var(--font-display);
  font-size: 30px;
  color: var(--ink);
}
.hero-meta .item .label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- Cards / Grid ---------- */
.grid { display: grid; gap: 32px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 40px 34px;
  border-radius: var(--radius);
  transition: transform 0.45s var(--ease), border-color 0.45s var(--ease), box-shadow 0.45s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-soft);
  box-shadow: 0 24px 50px -28px rgba(22, 19, 15, 0.25);
}
.card .idx {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.2em;
}
.card h3 { margin: 18px 0 12px; font-size: 21px; letter-spacing: 0.03em; }
.card p { color: var(--muted); font-size: 15px; }
.card .more {
  display: inline-block;
  margin-top: 22px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink);
}
.card .more .arrow { color: var(--accent); margin-left: 6px; }

/* ---------- 商品卡片（产品服务页） ---------- */
.product-card {
  display: flex; flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.45s var(--ease), border-color 0.45s var(--ease), box-shadow 0.45s var(--ease);
}
.product-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-soft);
  box-shadow: 0 24px 50px -28px rgba(22, 19, 15, 0.25);
}
.product-card .pc-cover {
  height: 116px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 40px; color: #fff;
  background: linear-gradient(135deg, #2b2722, #5a4e3e);
}
.product-card:nth-child(2) .pc-cover { background: linear-gradient(135deg, #1f2a2e, #3f5a5e); }
.product-card:nth-child(3) .pc-cover { background: linear-gradient(135deg, #2e2433, #5e4a66); }
.product-card:nth-child(4) .pc-cover { background: linear-gradient(135deg, #3a2e22, #6e5836); }
.product-card:nth-child(5) .pc-cover { background: linear-gradient(135deg, #22303a, #3a5a6e); }
.product-card .pc-body {
  padding: 22px 20px 22px;
  display: flex; flex-direction: column; flex: 1;
}
.product-card .pc-tag {
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent);
}
.product-card h3 { margin: 10px 0 10px; font-size: 18px; letter-spacing: 0.03em; }
.product-card p { color: var(--muted); font-size: 13.5px; line-height: 1.7; flex: 1; }
.product-card .pc-meta {
  margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line);
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px;
}
.product-card .pc-price {
  font-family: var(--font-display); font-size: 18px; color: var(--ink);
  white-space: nowrap;
}
.product-card .pc-price small { font-size: 12px; color: var(--muted); margin-left: 2px; }
.product-card .pc-more { font-size: 13px; letter-spacing: 0.06em; color: var(--accent); white-space: nowrap; }

/* ---------- Works ---------- */
.work {
  position: relative;
  display: block;
  border: 1px solid var(--line);
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-warm);
  aspect-ratio: 4 / 3;
}
.work .work-cover {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 40px;
  letter-spacing: 0.1em;
  color: #fff;
  transition: transform 0.6s var(--ease);
}
.work:hover .work-cover { transform: scale(1.05); }
.work .work-info {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 22px 24px;
  background: linear-gradient(to top, rgba(22,19,15,0.78), rgba(22,19,15,0));
  color: #fff;
  transform: translateY(8px);
  opacity: 0.95;
  transition: transform 0.5s var(--ease);
}
.work:hover .work-info { transform: translateY(0); }
.work .work-info .cat { font-size: 12px; letter-spacing: 0.2em; opacity: 0.8; text-transform: uppercase; }
.work .work-info .title { font-size: 19px; margin-top: 4px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat { text-align: center; padding: 20px 0; }
.stat .num {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 58px);
  color: var(--accent-soft);
  line-height: 1;
}
.stat .label { margin-top: 14px; font-size: 14px; letter-spacing: 0.14em; color: #cfc9bd; }

/* ---------- Timeline ---------- */
.timeline { border-left: 1px solid var(--line); margin-left: 8px; }
.timeline li { position: relative; padding: 0 0 44px 36px; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px; top: 6px;
  width: 9px; height: 9px;
  background: var(--accent);
  border-radius: 50%;
}
.timeline .year {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.timeline h4 { margin: 6px 0 8px; font-size: 18px; }
.timeline p { color: var(--muted); font-size: 15px; }

/* ---------- Team ---------- */
.member { text-align: center; }
.member .avatar {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 38px;
  color: var(--accent);
  margin-bottom: 20px;
}
.member h4 { font-size: 18px; }
.member .role { font-size: 13px; letter-spacing: 0.14em; color: var(--muted); margin-top: 4px; }

/* ---------- Service detail ---------- */
.service-row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
  padding: 72px 0;
  border-top: 1px solid var(--line);
}
.service-row:first-of-type { border-top: 0; }
.service-row .sr-num {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 0.2em;
}
.service-row h3 { font-size: clamp(24px, 3vw, 34px); margin: 14px 0 18px; }
.service-row p { color: var(--ink-soft); font-size: 16px; }
.service-row .tags { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }
.service-row .tags span {
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
}
.service-row .sr-visual {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  background: var(--bg-warm);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 46px;
  color: var(--accent-soft);
  letter-spacing: 0.08em;
}

/* ---------- Contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.contact-info .info-item { padding: 22px 0; border-bottom: 1px solid var(--line); }
.contact-info .info-item:last-child { border-bottom: 0; }
.contact-info .info-item .k { font-size: 13px; letter-spacing: 0.2em; color: var(--muted); text-transform: uppercase; }
.contact-info .info-item .v { font-size: 18px; margin-top: 6px; }
.contact-info .info-item .v a:hover { color: var(--accent); }

.form-field { margin-bottom: 22px; }
.form-field label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 8px;
}
.form-field input,
.form-field textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.3s var(--ease);
}
.form-field input:focus,
.form-field textarea:focus { outline: none; border-color: var(--accent); }
.form-field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 13px; color: var(--muted); margin-top: 8px; }
.form-ok { display: none; padding: 16px; background: var(--bg-warm); border: 1px solid var(--accent-soft); color: var(--ink); border-radius: var(--radius); margin-bottom: 20px; }

.map {
  margin-top: 64px;
  aspect-ratio: 21 / 7;
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  letter-spacing: 0.2em;
  font-size: 14px;
}

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band h2 { font-family: var(--font-display); font-size: clamp(32px, 5vw, 60px); color: #c9a063; letter-spacing: -0.025em; line-height: 1.08; }
.cta-band p { margin: 18px auto 36px; max-width: 560px; color: #cfc9bd; font-size: 17px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-dark);
  color: #b7b1a6;
  padding: 80px 0 36px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-mark { font-family: var(--font-display); font-size: 24px; color: #fff; }
.footer-brand p { margin-top: 16px; font-size: 14px; max-width: 280px; }
.footer-col h5 { color: #fff; font-size: 14px; letter-spacing: 0.14em; margin-bottom: 18px; font-weight: 600; }
.footer-col a { display: block; font-size: 14px; padding: 6px 0; color: #b7b1a6; transition: color 0.3s var(--ease); }
.footer-col a:hover { color: var(--accent-soft); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding-top: 28px;
  font-size: 13px;
  color: #807a70;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .service-row { grid-template-columns: 1fr; gap: 28px; padding: 56px 0; }
  .contact-wrap { grid-template-columns: 1fr; gap: 40px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 680px) {
  .section { padding: 80px 0; }
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 76px; left: 0; right: 0;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 8px 0;
  }
  .nav-links.open a,
  .nav-links.open .nav-item { width: 100%; text-align: center; }
  .nav-links.open .nav-trigger { justify-content: center; width: 100%; }
  .nav-links.open a { padding: 16px var(--gut); border-top: 1px solid var(--line); }
  .nav-links.open a:first-child { border-top: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .hero-meta { position: static; margin-top: 48px; gap: 28px; flex-wrap: wrap; }
  .hero::before, .hero::after { display: none; }
  .footer-top { grid-template-columns: 1fr; }
}

/* ---------- PPT 预览（沉浸式演示播放器） ---------- */
.uploader {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-radius: 999px;
  background: #fff;
  padding: 72px 80px;
  min-height: 220px;
  text-align: center;
  cursor: pointer;
  transition: background 0.35s var(--ease);
}
.uploader:hover .up-title,
.uploader:hover .up-sub-inline { color: #e53935; }
.uploader .up-title { margin-top: 0; font-size: clamp(18px, 2.5vw, 30px); letter-spacing: 0.04em; line-height: 1.5; word-break: break-word; }
.uploader .up-sub-inline { font-size: inherit; color: var(--muted); letter-spacing: 0.02em; }
.uploader .up-sub-inline b { color: var(--ink); font-weight: 600; }

/* PPT 作品库（数据库）列表 */
.deck-db-head { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.deck-db-head h2 { font-size: clamp(26px, 4.5vw, 40px); font-weight: 600; letter-spacing: .04em; margin: 0; }
.deck-db-note { font-size: clamp(12px, 1.3vw, 13px); color: var(--muted); letter-spacing: .03em; }
.deck-db-toolbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 44px; }
.deck-db-search {
  flex: 1; min-width: 200px;
  height: 50px; padding: 0 20px; border: 1px solid var(--line);
  border-radius: 999px; background: var(--bg-warm); color: var(--ink); font-size: clamp(13px, 1.2vw, 15px);
  box-sizing: border-box;
}
.deck-db-search:focus { outline: none; border-color: var(--accent); background: #fff; }

/* 自定义下拉选择器 */
.deck-select { position: relative; min-width: 120px; }
.deck-select-trigger {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px;
  height: 50px; padding: 0 18px 0 20px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--bg-warm); color: var(--ink);
  font-size: clamp(13px, 1.2vw, 15px); cursor: pointer;
  box-sizing: border-box; white-space: nowrap;
  transition: border-color .2s, background .2s;
}
.deck-select-trigger::after {
  content: "";
  width: 12px; height: 8px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23999' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat center/contain;
  flex-shrink: 0;
}
.deck-select-trigger:hover { border-color: #bbb; }
.deck-select.open .deck-select-trigger { border-color: var(--accent); background: #fff; }

/* 下拉面板 */
.deck-select-panel {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: #fff; border: 1px solid #e8e2d8;
  border-radius: 14px;
  box-shadow:
    0 12px 32px rgba(22,19,15,.10),
    0 4px 12px rgba(22,19,15,.06),
    0 0 0 1px rgba(255,255,255,.6) inset;
  padding: 5px; z-index: 100; max-height: 300px; overflow-y: auto;
  /* 自定义滚动条 */
  scrollbar-width: thin; scrollbar-color: #ddd transparent;
}
.deck-select-panel::-webkit-scrollbar { width: 5px; }
.deck-select-panel::-webkit-scrollbar-track { background: transparent; }
.deck-select-panel::-webkit-scrollbar-thumb { background: #ddd; border-radius: 3px; }
.deck-select-panel::-webkit-scrollbar-thumb:hover { background: #bbb; }

.deck-select-opt {
  display: block; width: 100%; padding: 10px 16px;
  border: none; border-radius: 9px; background: none; text-align: left;
  font-size: clamp(12.5px, 1.1vw, 14px); color: var(--ink); cursor: pointer;
  white-space: nowrap; letter-spacing: .01em; line-height: 1.35;
  transition: background .15s, color .15s, transform .1s;
}
.deck-select-opt:hover {
  background: linear-gradient(135deg, #faf7f2, #f5f0e6);
  color: var(--accent-dark, #86683f);
  transform: translateX(2px);
}
.deck-select-opt.active {
  color: var(--accent); font-weight: 600; letter-spacing: .02em;
}
.deck-select-opt.deck-select-add {
  border-top: 1px solid #eee8dd; margin-top: 3px; padding-top: 11px;
  color: #aaa; font-size: 12.5px; letter-spacing: .02em;
}
.deck-select-opt.deck-select-add:hover {
  background: #f8f4ef; color: var(--ink); transform: none;
}
.deck-db-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 30px 0 40px; }

/* ===== 作品库响应式：电脑 / iPad / 手机 ===== */
/* iPad 横屏及以下 → 3 列 */
@media (max-width: 1100px) {
  .deck-db-grid { grid-template-columns: repeat(3, 1fr); }
}
/* iPad 竖屏 / 小平板 → 2 列，工具栏搜索框占满整行 */
@media (max-width: 820px) {
  .deck-db-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .deck-db-toolbar { gap: 10px; }
  .deck-db-search { flex: 1 1 100%; min-width: 0; }
  .deck-select { flex: 1 1 auto; min-width: 0; }
  .uploader { padding: 56px 40px; }

  /* —— 移动端卡片优化 —— */
  /* 操作按钮常驻显示（手机无 hover，否则 ▶/⬇/✕ 永远看不到） */
  .deck-db-card { padding: 14px 14px 16px; }
  .deck-db-hover-actions { display: flex; justify-content: center; gap: 10px; margin-top: 12px; }
  /* 标题允许两行，窄屏不再生硬省略 */
  .deck-db-title {
    white-space: normal;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    margin-top: 12px;
  }
  /* 移动端不触发 hover 整页红底，避免点击误触视觉；仅保留轻微上浮 */
  .deck-db-card:hover {
    transform: none;
    background: #f9f9f9;
    justify-content: flex-start;
    align-items: stretch;
    box-shadow: 0 8px 24px -8px rgba(22,19,15,.18);
  }
  .deck-db-card:hover .deck-db-cover { display: block; }
  .deck-db-card:hover .deck-db-title,
  .deck-db-card:hover .deck-db-meta { color: var(--ink); }
  .deck-db-card:hover .deck-db-tags { justify-content: flex-start; }
  /* 常驻操作按钮改用实色，移动端更清晰可点 */
  .deck-db-btn.deck-db-play-btn,
  .deck-db-btn.deck-db-del-btn,
  .deck-db-btn.deck-db-dl-btn {
    background: rgba(22,19,15,.85); border-color: transparent; color: #fff; padding: 8px 18px;
  }
}
/* 手机 → 1 列，下拉占满整行，上传区改为圆角矩形 */
@media (max-width: 480px) {
  .deck-db-grid { grid-template-columns: 1fr; }
  .deck-select { flex: 1 1 100%; }
  .deck-db-head { margin-bottom: 14px; }
  .deck-db-toolbar { margin-bottom: 28px; }
  .uploader { padding: 44px 20px; border-radius: 24px; }
  /* 单列卡片更宽松，按钮更大更易点 */
  .deck-db-card { padding: 16px 16px 18px; }
  .deck-db-hover-actions { margin-top: 14px; gap: 12px; }
  .deck-db-btn.deck-db-play-btn,
  .deck-db-btn.deck-db-del-btn,
  .deck-db-btn.deck-db-dl-btn { padding: 10px 22px; font-size: 14px; }
}
/* ========== 作品卡片 ========== */
.deck-db-card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px 18px 20px 18px;
  border: none;
  border-radius: calc(var(--radius) + 4px);
  background: #f9f9f9;
  box-shadow: 0 8px 24px -8px rgba(22,19,15,.18);
  cursor: pointer;
  overflow: hidden;
  position: relative;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
}
/* 悬停：上浮动 + 红底铺满 + 内容居中 */
.deck-db-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px -24px rgba(22,19,15,.4);
  background: #e53935;
  justify-content: center;
  align-items: center;
}
/* hover 时隐藏封面，只留文字 */
.deck-db-card:hover .deck-db-cover { display: none; }
/* hover 时文字 / 标签转白 */
.deck-db-card:hover .deck-db-title,
.deck-db-card:hover .deck-db-meta { color: #fff; }
.deck-db-card:hover .deck-db-tags { justify-content: center; }
.deck-db-card:hover .deck-db-tag { color: rgba(255,255,255,.85); }
/* 悬停操作按钮（▶ / ⬇ / ✕）：默认隐藏，悬停显示 */
.deck-db-hover-actions { display: none; gap: 8px; margin-top: 8px; }
.deck-db-card:hover .deck-db-hover-actions { display: flex; justify-content: center; }

/* —— 封面 —— */
.deck-db-cover { margin: -18px -18px 0; position: relative; aspect-ratio: 16 / 9; background: #f3efe9; overflow: hidden; }
.deck-db-cover.has-img { background: #1c1a17; }
.deck-db-cover-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.deck-db-cover-txt { padding: 14px 16px; font-size: 13px; line-height: 1.5; color: #6b5b43; height: 100%; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical; }
/* 封面顶部浮层条：编号 + 操作按钮 */
.deck-db-cover-bar {
  position: absolute; top: 0; left: 0; right: 0; z-index: 2;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 8px 10px;
  background: linear-gradient(to bottom, rgba(22,19,15,.55), rgba(22,19,15,0));
}
.deck-db-num {
  background: rgba(229,57,53,.85); color: #fff;
  font-size: 10px; font-weight: 700; letter-spacing: .06em;
  padding: 3px 8px; border-radius: 999px;
  backdrop-filter: blur(4px);
}
/* 封面内小按钮（胶囊） */
.deck-db-btn-sm {
  font-size: 12px; padding: 4px 12px;
  border-radius: 999px; border: 1px solid rgba(255,255,255,.5);
  background: rgba(22,19,15,.45); color: #fff;
  cursor: pointer; backdrop-filter: blur(4px);
  transition: all .25s var(--ease);
}
.deck-db-btn-sm:hover { background: rgba(22,19,15,.7); border-color: rgba(255,255,255,.8); }
/* 悬停页操作按钮（胶囊形） */
.deck-db-btn.deck-db-play-btn,
.deck-db-btn.deck-db-del-btn,
.deck-db-btn.deck-db-dl-btn {
  font-size: 13px; padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.45);
  background: rgba(0,0,0,.25); color: #fff;
  cursor: pointer; transition: background .2s var(--ease);
}
.deck-db-btn.deck-db-play-btn:hover,
.deck-db-btn.deck-db-del-btn:hover,
.deck-db-btn.deck-db-dl-btn:hover { background: rgba(0,0,0,.5); }
.deck-db-btn.deck-db-dl-btn { line-height: 0; }
.deck-db-btn.deck-db-dl-btn svg { display: block; }

/* —— 标题 / 元信息 —— */
.deck-db-title {
  font-size: 16px;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
    margin-top: 15px;
}
.deck-db-title-input {
  width: 100%; box-sizing: border-box; font: inherit; font-weight: 600; color: #fff;
  background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.6);
  border-radius: 999px; padding: 4px 14px; outline: none; text-align: center;
}
.deck-db-meta { font-size: 12px; color: var(--muted); letter-spacing: .02em; display: none; }
.deck-db-card:hover .deck-db-meta { display: block; }

/* —— 标签（纯文字、小间距） —— */
.deck-db-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 18px;
    cursor: pointer;
    margin-bottom: -4px;
}
.deck-db-tag { font-size: 11px; line-height: 1.4; white-space: nowrap; }
.deck-db-tag.ind { color: #1f5fa6; }
.deck-db-tag.biz { color: #9a5b1f; }
/* 点标签就地编辑分类 */
.deck-db-tag-edit-hint { font-size: 11px; color: var(--muted); cursor: pointer; padding: 4px 2px; letter-spacing: .02em; }
.deck-db-card:hover .deck-db-tag-edit-hint { color: rgba(255,255,255,.7); }
.deck-db-tag-edit-row { display: flex; gap: 6px; align-items: flex-start; width: 100%; }
.deck-db-tag-edit-label { flex: 0 0 36px; padding-top: 5px; font-size: 11px; color: var(--muted); letter-spacing: .03em; }
.deck-db-card:hover .deck-db-tag-edit-label { color: rgba(255,255,255,.8); }
.deck-db-tag-opts { display: flex; flex-wrap: wrap; gap: 5px; }
.deck-db-tag-edit-custom { display: flex; gap: 5px; width: 100%; margin-top: 2px; }
.deck-db-tag-edit-input {
  flex: 1 1 auto; min-width: 0; font-size: 11px; line-height: 1;
  padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--bg-warm); color: var(--ink); outline: none;
}
.deck-db-tag-edit-input:focus { border-color: var(--accent); }
.deck-db-tag-edit-add {
  flex: 0 0 auto; font-size: 11px; line-height: 1; padding: 5px 12px;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
  cursor: pointer; border-radius: 999px; white-space: nowrap; transition: all .2s var(--ease);
}
.deck-db-tag-edit-add:hover { opacity: .88; }
.deck-db-card:hover .deck-db-tag-edit-input { color: rgba(255,255,255,.9); border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.12); }
.deck-db-card:hover .deck-db-tag-edit-add { background: #fff; color: #e53935; border-color: #fff; }
.deck-db-tag-toggle {
  font-size: 11px; line-height: 1; padding: 4px 12px;
  border: 1px solid var(--line); background: var(--bg-warm); color: var(--muted);
  cursor: pointer; transition: all .2s var(--ease); white-space: nowrap;
  border-radius: 999px;
}
.deck-db-tag-toggle:hover { border-color: var(--ink); color: var(--ink); }
.deck-db-tag-toggle.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.deck-db-card:hover .deck-db-tag-toggle { color: rgba(255,255,255,.75); border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.1); }
.deck-db-card:hover .deck-db-tag-toggle:hover { color: #fff; border-color: rgba(255,255,255,.6); background: rgba(255,255,255,.2); }
.deck-db-card:hover .deck-db-tag-toggle.on { background: #fff; border-color: #fff; color: #e53935; }
.deck-db-actions {
  display: flex; gap: 8px; margin-top: 4px;
}
.deck-db-btn {
  flex: 1;
  border-radius: var(--radius);
  background: transparent;
  color: #ffffff;
  font-size: 13px;
  letter-spacing: .03em;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.deck-db-btn:hover { border-color: var(--ink); }
.deck-db-btn.accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.deck-db-btn.accent:hover { background: var(--accent-dark, #86683f); }
.deck-db-empty { padding: 40px 0; text-align: center; color: var(--muted); font-size: 14px; letter-spacing: .03em; }

@media (max-width: 980px) { .deck-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 680px)  { .deck-grid { grid-template-columns: repeat(2, 1fr); } }

/* ===== 演示放映模式（上传后激活） ===== */
body.presenting {
  background: #1a1816 !important;
  overflow: hidden !important;
}
body.presenting > header,
body.presenting > .hero,
body.presenting > footer,
body.presenting > section:not(.presenter-stage) { display: none !important; }

.presenter-stage {
  display: none;
  position: fixed; inset: 0; z-index: 99999;
  background: #1a1816;
  flex-direction: column;
}
.presenter-stage.active { display: flex; }

/* 放映加载占位提示 */
.prs-loading-tip {
  margin: auto;
  color: #cfc9bd;
  font-size: 16px;
  letter-spacing: .08em;
  opacity: .8;
}

/* 放映模式顶部工具栏（极简，半透明） */
.prs-bar {
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 20px;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  color: #cfc9bd; font-size: 13px;
  z-index: 2;
}
.prs-bar-left, .prs-bar-right { display: flex; align-items: center; gap: 10px; }
.prs-counter { letter-spacing: 0.06em; }
.prs-counter b { color: #e9dcc8; font-weight: 700; }
.prs-btn {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  color: #cfc9bd; padding: 5px 12px; border-radius: 4px; cursor: pointer;
  font-size: 12px; transition: .2s; white-space: nowrap;
}
.prs-btn:hover { background: rgba(255,255,255,0.16); border-color: rgba(255,255,255,0.25); color: #fff; }
.prs-btn-icon {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  color: #cfc9bd; border-radius: 4px; cursor: pointer; font-size: 15px; transition: .2s;
}
.prs-btn-icon:hover { background: rgba(255,255,255,0.16); color: #fff; }

/* 幻灯片舞台：占满所有剩余空间 */
.prs-stage {
  flex: 1;
  display: flex; justify-content: center; align-items: center;
  padding: 24px; min-height: 0; overflow: hidden;
  position: relative;
}

/* 幻灯片卡片：宽屏比例，自适应 */
.prs-slide {
  width: 100%; max-width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 100%;
  background: #fff;
  border-radius: 3px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.55);
  overflow: hidden;
  display: flex; flex-direction: column;
  position: relative;
}
/* 有图片：单图占满 */
.prs-slide .prs-imgs {
  position: absolute; inset: 0;
}
.prs-slide .prs-imgs img {
  width: 100%; height: 100%;
  object-fit: contain;
}

/* 有图片时：图片全屏显示，文字浮在下方或上方 */
.prs-slide.has-img { }
.prs-slide .prs-content {
  position: absolute; z-index: 2;
  padding: 4% 5%;
  pointer-events: none;
}
.prs-slide .prs-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 32px);
  color: #1a1816; line-height: 1.25;
  text-shadow: 0 1px 3px rgba(255,255,255,0.7);
  margin-bottom: 8px;
}
.prs-slide .prs-body {
  font-size: clamp(13px, 1.5vw, 18px);
  color: #333; line-height: 1.7;
  text-shadow: 0 1px 2px rgba(255,255,255,0.6);
  white-space: pre-wrap; word-break: break-word;
  max-width: 70ch;
}
/* 无图片时：文字居中 */
.prs-slide.no-img {
  justify-content: center; align-items: center;
  padding: 6%;
}
.prs-slide.no-img .prs-title { text-align: center; text-shadow: none; color: var(--ink); }
.prs-slide.no-img .prs-body { text-align: center; text-shadow: none; color: var(--ink-soft); }

/* 底部缩略图条 */
.prs-thumbs {
  flex-shrink: 0;
  display: flex; gap: 6px; padding: 8px 16px;
  background: rgba(0,0,0,0.35); overflow-x: auto;
  align-items: center;
}
.prs-thumb {
  flex: 0 0 auto;
  width: 96px; aspect-ratio: 16 / 9;
  border: 2px solid transparent; border-radius: 3px;
  background: #fff; overflow: hidden; cursor: pointer;
  transition: all 0.2s; opacity: 0.55;
  position: relative;
}
.prs-thumb:hover { opacity: 0.85; transform: translateY(-2px); }
.prs-thumb.active { border-color: #c9a96e; opacity: 1; box-shadow: 0 2px 10px -2px rgba(201,169,110,0.5); }
.prs-thumb img { width: 100%; height: 100%; object-fit: cover; }
.prs-thumb-num {
  position: absolute; top: 2px; right: 3px;
  font-size: 9px; color: #333; background: rgba(255,255,255,0.8);
  padding: 0 4px; border-radius: 2px; font-weight: 600;
}

/* 点击翻页区域提示 */
.prs-hint {
  position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.35); font-size: 12px;
  pointer-events: none; transition: opacity 0.5s;
  z-index: 3;
}
.prs-hint.hidden { opacity: 0; }

/* 全屏播放（强调按钮） */
.prs-btn-accent {
  background: #c9a96e; border: 1px solid #c9a96e; color: #1a1816;
  padding: 5px 14px; border-radius: 4px; cursor: pointer;
  font-size: 12.5px; font-weight: 700; transition: .2s; white-space: nowrap;
}
.prs-btn-accent:hover { background: #d8ba7f; border-color: #d8ba7f; color: #1a1816; }

/* 进入全屏提示浮层（真实浏览器中首次出现，点一下即真·全屏） */
.prs-fs-prompt {
  display: none; position: absolute; inset: 0; z-index: 30;
  flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  background: rgba(26,24,22,0.55); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
}
.prs-fs-prompt.show { display: flex; }
.prs-fs-btn {
  background: #c9a96e; color: #1a1816; border: none;
  padding: 16px 32px; font-size: 18px; font-weight: 700; border-radius: 8px;
  cursor: pointer; box-shadow: 0 24px 60px -22px rgba(0,0,0,0.75);
  transition: transform .15s, background .2s;
}
.prs-fs-btn:hover { background: #d8ba7f; transform: translateY(-2px); }
.prs-fs-sub { color: rgba(255,255,255,0.72); font-size: 13px; letter-spacing: 0.04em; }

/* 原生全屏（真实浏览器中 requestFullscreen 后）：只显示幻灯片，其余全隐 */
.presenter-stage:fullscreen,
.presenter-stage.fs {
  background: #000; display: flex; flex-direction: column;
  width: 100vw; height: 100vh; overflow: hidden;
}
/* 隐藏一切非内容元素：工具栏 / 翻页提示 / 缩略图 / 全屏提示浮层 */
.presenter-stage:fullscreen .prs-bar,
.presenter-stage.fs .prs-bar,
.presenter-stage:fullscreen .prs-hint,
.presenter-stage.fs .prs-hint,
.presenter-stage:fullscreen .prs-thumbs,
.presenter-stage.fs .prs-thumbs,
.presenter-stage:fullscreen .prs-fs-prompt,
.presenter-stage.fs .prs-fs-prompt {
  display: none !important;
}
/* 舞台占满整屏，幻灯片居中 */
.presenter-stage:fullscreen .prs-stage,
.presenter-stage.fs .prs-stage {
  flex: 1; padding: 0; min-height: 0;
}
/* 幻灯片铺满整屏（保留 16:9 比例居中，像 PPT 放映） */
.presenter-stage:fullscreen .prs-slide,
.presenter-stage.fs .prs-slide {
  max-width: 100%; max-height: 100%;
  box-shadow: none; border-radius: 0;
}
.presenter-stage:fullscreen .prs-slide.has-img .prs-imgs img,
.presenter-stage.fs .prs-slide.has-img .prs-imgs img { object-fit: contain; }

/* ===== 常规预览面板（非放映模式，保留给"重新上传"前） ===== */
.preview-panel { display: none; margin-top: 20px; }
.preview-panel.show { display: flex; flex-direction: column; }

.preview-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: #fff;
  flex-shrink: 0;
}
.preview-toolbar .pt-left, .preview-toolbar .pt-right { display: flex; align-items: center; gap: 8px; }
.preview-toolbar .counter { font-size: 13px; letter-spacing: 0.06em; color: var(--ink-soft); }
.preview-toolbar .counter b { font-family: var(--font-display); color: var(--accent); font-size: 16px; }
.icon-btn {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 16px; color: var(--ink);
  transition: all 0.25s var(--ease);
}
.icon-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); background: #faf8f4; }
.icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* 舞台：弹性填充，幻灯片居中放大 */
.slide-stage {
  flex: 1;
  background: #eae6df;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex; justify-content: center; align-items: center;
  min-height: 420px;
  overflow: hidden;
}

/* 幻灯片卡片：宽屏比例，自适应填满舞台 */
.slide-card {
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 20px 40px -18px rgba(22,19,15,0.30);
  padding: 2.5% 3.5%;
  overflow-y: auto;
  display: flex; flex-direction: column;
  position: relative;
}
/* 图片：占满卡片主要空间 */
.slide-card .sc-images {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px;
  flex: 1; align-items: center; justify-content: center;
  min-height: 0;
}
.slide-card .sc-images img {
  max-height: 100%; max-width: 100%; object-fit: contain;
  border: 1px solid #eee; border-radius: 3px; background: #fafafa;
}
/* 有图片时文字缩小让位 */
.slide-card.has-img .sc-title { font-size: clamp(15px, 2vw, 22px); margin-bottom: 6px; }
.slide-card.has-img .sc-body { font-size: 12.5px; line-height: 1.65; }

.slide-card .sc-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 32px);
  color: var(--ink); line-height: 1.2; margin-bottom: 10px;
}
.slide-card .sc-body { font-size: 14.5px; color: var(--ink-soft); line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.slide-card .sc-empty { margin: auto; color: var(--muted); font-size: 15px; }

/* 缩略图条：紧凑、带背景 */
.slide-thumbs {
  flex-shrink: 0;
  display: flex; gap: 8px; margin-top: 10px; overflow-x: auto; padding: 8px 6px;
  background: #f7f5f1; border-radius: var(--radius);
}
.slide-thumbs .thumb {
  flex: 0 0 auto;
  width: 110px; aspect-ratio: 16 / 9;
  border: 2px solid transparent;
  border-radius: 4px;
  background: #fff;
  padding: 5px;
  cursor: pointer;
  position: relative;
  transition: all 0.25s var(--ease);
  overflow: hidden;
}
.slide-thumbs .thumb:hover { border-color: var(--accent-soft); transform: translateY(-2px); }
.slide-thumbs .thumb.active { border-color: var(--accent); box-shadow: 0 3px 10px -3px rgba(154,123,79,0.4); }
.slide-thumbs .thumb .t-num {
  position: absolute; top: 3px; left: 5px;
  font-size: 9px; color: var(--muted); background: rgba(255,255,255,0.88); padding: 1px 5px; border-radius: 3px;
}
.slide-thumbs .thumb .t-text {
  margin-top: 8px; font-size: 9.5px; line-height: 1.35; color: var(--ink-soft);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.preview-msg { display: none; margin-top: 18px; padding: 14px 18px; border-radius: var(--radius); font-size: 14px; }
.preview-msg.show { display: block; }
.preview-msg.err { background: #fbeae8; border: 1px solid #e0a89f; color: #9c3b2e; }
.preview-msg.info { background: var(--bg-warm); border: 1px solid var(--line); color: var(--ink-soft); }
.preview-loading { display: none; text-align: center; color: var(--muted); padding: 30px 0; letter-spacing: 0.1em; }
.preview-loading.show { display: block; }

/* 内嵌预览提示条 */
.iframe-hint {
  background: #fff8ec; border: 1px solid #e7d3a8; color: #7a5a1e;
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 18px;
  font-size: 13.5px; line-height: 1.7;
}
.iframe-hint b { color: #5f7a2e; }
.iframe-open-btn {
  display: inline-block; margin: 0 4px; padding: 6px 14px;
  border: 1px solid var(--accent); border-radius: 999px;
  background: var(--accent); color: #fff; cursor: pointer; font-size: 13px; letter-spacing: .03em;
  transition: background .2s var(--ease);
}
.iframe-open-btn:hover { background: #86683f; }
.iframe-hint code {
  display: inline-block; margin-top: 6px; padding: 3px 8px;
  background: rgba(0,0,0,.05); border-radius: 6px; font-size: 12px; word-break: break-all;
}
.btn-ghost {
  background: transparent; border: 1px solid var(--line); color: var(--ink-soft);
  text-decoration: none; padding: 9px 14px; border-radius: 999px; font-size: 13px;
  display: inline-flex; align-items: center; gap: 4px; transition: .2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-accent {
  background: var(--accent); border-color: var(--accent); color: #fff;
  padding: 9px 18px; font-size: 13px; letter-spacing: 0.04em;
  text-decoration: none; display: inline-flex; align-items: center; gap: 5px;
  border-radius: var(--radius); transition: .25s; white-space: nowrap;
}
.btn-accent:hover { background: #8a6b42; border-color: #8a6b42; color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px -3px rgba(154,123,79,0.45); }

/* 全屏模式（CSS 覆盖层，iframe/内嵌预览中也可用） */
.slide-stage.fs-nav { cursor: pointer; }
.icon-btn.active { border-color: var(--accent); color: var(--accent); background: #fbf8f3; }
.preview-panel.is-fs {
  position: fixed; inset: 0; z-index: 9999; margin: 0;
  background: #0e0c0a;
  display: flex; flex-direction: column;
  gap: 18px; padding: 26px;
  width: 100%; height: 100%; overflow: hidden;
}
.preview-panel.is-fs .preview-toolbar,
.preview-panel:fullscreen .preview-toolbar {
  border-color: rgba(255,255,255,0.12); background: transparent; color: #e9e3d8;
}
.preview-panel.is-fs .preview-toolbar .counter,
.preview-panel:fullscreen .preview-toolbar .counter { color: #e9e3d8; }
.preview-panel.is-fs .icon-btn,
.preview-panel:fullscreen .icon-btn { background: transparent; border-color: rgba(255,255,255,0.16); color: #e9e3d8; }
.preview-panel.is-fs .icon-btn:hover:not(:disabled),
.preview-panel:fullscreen .icon-btn:hover:not(:disabled) { border-color: var(--accent-soft); color: var(--accent-soft); }
.preview-panel.is-fs .btn,
.preview-panel:fullscreen .btn { border-color: rgba(255,255,255,0.3); color: #e9e3d8; }
.preview-panel.is-fs .btn:hover,
.preview-panel:fullscreen .btn:hover { background: #e9e3d8; color: var(--ink); }
.preview-panel.is-fs .slide-stage,
.preview-panel:fullscreen .slide-stage { flex: 1; min-height: 0; background: transparent; border: 0; padding: 0; align-items: center; }
.preview-panel.is-fs .slide-card,
.preview-panel:fullscreen .slide-card { max-width: min(1400px, 96vw); box-shadow: 0 40px 100px -45px rgba(0,0,0,0.75); }
.preview-panel.is-fs .slide-card .sc-images img,
.preview-panel:fullscreen .slide-card .sc-images img { max-height: 60vh; }
.preview-panel.is-fs .slide-thumbs .thumb,
.preview-panel:fullscreen .slide-thumbs .thumb { background: #1c1813; border-color: rgba(255,255,255,0.14); }
.preview-panel.is-fs .slide-thumbs .thumb .t-text,
.preview-panel:fullscreen .slide-thumbs .thumb .t-text { color: #cfc9bd; }
.preview-panel.is-fs .slide-thumbs .thumb .t-num,
.preview-panel:fullscreen .slide-thumbs .thumb .t-num { color: #9a9389; }

/* =========================================================
   客户案例 / 合作品牌 Logo 墙（像素级还原截图）
   ========================================================= */
.clients-section {
  padding: 50px 0 70px;
  background: #fff;
}

/* 顶部标语栏 */
.clients-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid #e85a2f;  /* 橙红色分隔线 */
}
.clients-tagline {
  font-size: 14px;
  color: #666;
  letter-spacing: 0.02em;
  font-family: var(--font-sans);
}
.clients-more-btn {
  font-size: 13px;
  padding: 6px 22px;
  border: 1px solid #ddd;
  border-radius: 20px;
  background: #fff;
  cursor: pointer;
  color: #666;
  transition: all 0.25s var(--ease);
  font-family: var(--font-sans);
}
.clients-more-btn:hover {
  border-color: #e85a2f;
  color: #e85a2f;
}

/* 12 列网格 — 与截图一致 */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0;
}

/* 单个 Logo 卡片 */
.client-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px;
  padding: 8px 4px;
  border: none;
  border-radius: 0;
  background: transparent;
  transition: all 0.25s var(--ease);
}
.client-logo img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
.client-logo:hover {
  border-color: #e85a2f;
  box-shadow: 0 2px 10px rgba(232,90,47,0.12);
  transform: translateY(-1px);
}

/* 统计卡片（黑色，跨 5 列） */
.client-stats-card {
  grid-column: span 5;
  overflow: hidden;
  border-radius: 6px;
  background: #0a0a0a;
}
.client-stats-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* 响应式 */
@media (max-width: 1024px) {
  .clients-grid { grid-template-columns: repeat(6, 1fr); }
  .client-stats-card { grid-column: span 6 !important; }
}
@media (max-width: 768px) {
  .clients-grid { grid-template-columns: repeat(4, 1fr); gap: 0; }
  .client-stats-card { grid-column: span 4 !important; }
  .client-logo { height: 64px; }
}
@media (max-width: 480px) {
  .clients-grid { grid-template-columns: repeat(3, 1fr); gap: 0; }
  .client-stats-card { grid-column: span 3 !important; }
  .client-logo { height: 56px; }
  .clients-header { flex-direction: column; align-items: flex-start; gap: 10px; }
}

/* =========================================================
   作品案例展示网格（像素级还原截图）
   6列不规则瀑布流，无间隙无缝拼接
   ========================================================= */
.portfolio-section {
  padding: 0 0 60px;
  background: #fff;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  auto-flow: dense;
}

/* 所有卡片基础 */
.pf-card {
  position: relative;
  overflow: hidden;
  background: #111;
}
.pf-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 文字叠加层 */
.pf-card__overlay {
  position: absolute;
  top: 16px;
  left: 18px;
  z-index: 2;
}
.pf-card__overlay span,
.pf-card__en,
.pf-card__zh {
  display: block;
  color: #fff;
  line-height: 1.3;
}
.pf-card__en {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-family: var(--font-sans);
}
.pf-card__zh {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-top: 4px;
  font-family: var(--font-sans);
}
.pf-card__en-sm {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  line-height: 1.3;
  color: #fff;
  font-family: var(--font-sans);
}
.pf-card__zh-sm {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  margin-top: 3px;
  font-family: var(--font-sans);
}

/* ---- 各卡片定位与尺寸（按截图比例） ---- */

/* REAL ESTATE / 地产 — 左侧深青色，跨2行 */
.pf-card--realestate {
  grid-row: span 2;
  background: #1a3a4a;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 30px 24px;
  min-height: 400px;
}
.pf-card--realestate .pf-card__en { color: #5ba8b8; font-size: 22px; }
.pf-card--realestate .pf-card__zh { color: #5ba8b8; opacity: 0.7; }

/* 快速了解清美 — 大图跨2行 */
.pf-card--img:nth-child(2) {
  grid-column: span 2;
  grid-row: span 2;
}

/* 最新标志VI案例 — 黑底100标志 */
.pf-card--img:nth-child(3) { }

/* 年度品牌服务 */
.pf-card--img:nth-child(4) { }

/* 大品牌生态案例 / 清美国际创新设计 */
.pf-card--img:nth-child(5),
.pf-card--img:nth-child(6) { }

/* WEBSITE CONSTRUCTION / 网站建设 — 深蓝网点，跨到底 */
.pf-card--website {
  grid-row: span 2;
  background: #0d2137;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 30px 20px;
  min-height: 300px;
}
.pf-card--website .pf-card__en { color: #4ecdc4; font-size: 20px; line-height: 1.25; }
.pf-card--website .pf-card__zh { color: #4ecdc4; opacity: 0.7; }

/* 快消案例 / 人物肖像 */
.pf-card--img:nth-child(8),
.pf-card--img:nth-child(9) { }

/* 金融 整合案例 — 跨2列 */
.pf-card--img:nth-child(10) {
  grid-column: span 2;
}

/* 整合营销 / 文化设计 */
.pf-card--img:nth-child(11),
.pf-card--img:nth-child(12) { }

/* HIGHEST PUBLIC WELFARE / 清美公益 — 蓝色文字卡 */
.pf-card--welfare {
  background: #3a6b9e;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px 18px;
  min-height: 160px;
}
.pf-card--welfare .pf-card__en { color: #fff; font-size: 17px; line-height: 1.25; }
.pf-card--welfare .pf-card__zh { color: rgba(255,255,255,0.7); }

/* HIGHEST VIDEO / 清美视频 */
.pf-card--img:last-child { }

/* Hover 效果 */
.pf-card--img:hover img {
  transform: scale(1.03);
  transition: transform 0.45s ease;
}
.pf-card--img:hover .pf-card__overlay span {
  color: #e85a2f;
  transition: color 0.3s ease;
}

/* 响应式 */
@media (max-width: 1024px) {
  .portfolio-grid { grid-template-columns: repeat(4, 1fr); }
  .pf-card--img:nth-child(2) { grid-column: span 2; }
  .pf-card--img:nth-child(10) { grid-column: span 2; }
  .pf-card--realestate,
  .pf-card--website { grid-row: span 1; }
}
@media (max-width: 768px) {
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
  .pf-card--img:nth-child(2),
  .pf-card--img:nth-child(10) { grid-column: span 2; }
  .pf-card--realestate,
  .pf-card--website { grid-row: span 1; min-height: 200px; }
}