/* ============================================================
   Deep Labs 落地页 · 提单美学（高级版）
   深墨蓝沉浸 + 提单米白 + 烫金细节 + 印章红
   原则：柔和阴影、金色细线、奢侈留白、明暗节奏
   ============================================================ */

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

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

body {
  font-family: "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

::selection {
  background: rgba(168, 118, 62, 0.28);
}

/* ---------- Design Tokens ---------- */
:root {
  --paper: #f5f1e8;
  --paper-deep: #ece7d8;
  --paper-card: #fbf8f0;
  --ink: #0e1b23;
  --ink-soft: #1d303b;
  --brass: #a8763e;
  --gold-1: #e3be87;
  --gold-2: #b98a4d;
  --gold-3: #e9cd9c;
  --gold-line: rgba(201, 154, 91, 0.38);
  --gold-grad: linear-gradient(115deg, #e3be87 0%, #b98a4d 46%, #e9cd9c 76%, #a8763e 100%);
  --stamp: #a23823;
  --stamp-bright: #c0523c;
  --muted: #6e7b80;

  --serif: "Fraunces", "Noto Serif SC", Georgia, serif;
  --serif-en: "Fraunces", "Noto Serif SC", serif;
  --mono: "IBM Plex Mono", "Courier New", monospace;

  --shadow-paper: 0 30px 60px -28px rgba(5, 12, 17, 0.5), 0 12px 24px -16px rgba(5, 12, 17, 0.35);
  --shadow-card: 0 22px 44px -30px rgba(14, 27, 35, 0.4);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --container: 1220px;
}

/* 纸张噪点纹理 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.32;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

main,
.site-nav,
.site-footer,
.topbar {
  position: relative;
  z-index: 1;
}

/* ---------- 布局 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 148px 0;
  position: relative;
  overflow: hidden;
}

/* 章节超大衬线水印 */
.section::before {
  content: attr(data-mark);
  position: absolute;
  top: 4px;
  right: -12px;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(110px, 15vw, 210px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(14, 27, 35, 0.09);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

/* ---------- 单据式顶部信息条 ---------- */
.topbar {
  background: var(--ink);
  color: var(--gold-1);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 10px 20px;
  white-space: nowrap;
  overflow: hidden;
  border-bottom: 1px solid rgba(201, 154, 91, 0.22);
}

.topbar-sep {
  width: 4px;
  height: 4px;
  background: var(--brass);
  transform: rotate(45deg);
  flex: none;
}

.topbar-caret {
  width: 7px;
  height: 13px;
  background: var(--gold-2);
  animation: caret 1.1s steps(1) infinite;
}

@keyframes caret {
  50% {
    opacity: 0;
  }
}

/* ---------- 导航 ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(14, 27, 35, 0.12);
}

.site-nav-inner {
  display: flex;
  align-items: center;
  gap: 40px;
  height: 78px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-right: auto;
}

.brand-seal {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--gold-1);
  font-family: var(--serif-en);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.05em;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(201, 154, 91, 0.5);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: 0.01em;
}

.brand-en {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.nav-links {
  display: flex;
  gap: 34px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding: 5px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--brass);
  transition: width 0.3s var(--ease);
}

.nav-links a:hover::after {
  width: 100%;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 15px 32px;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    background-color 0.25s var(--ease),
    border-color 0.25s var(--ease),
    color 0.25s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

/* 主行动：深印章红 + 金 hairline，柔和投影 */
.btn-stamp {
  background: var(--stamp);
  color: var(--paper);
  border-color: rgba(233, 205, 156, 0.38);
  box-shadow: 0 16px 32px -16px rgba(162, 56, 35, 0.6);
}

.btn-stamp:hover {
  background: #8d2f1d;
  transform: translateY(-2px);
  box-shadow: 0 22px 40px -16px rgba(162, 56, 35, 0.68);
}

/* 描边：金 hairline */
.btn-brass {
  background: transparent;
  color: var(--ink);
  border-color: rgba(168, 118, 62, 0.55);
}

.btn-brass:hover {
  background: rgba(168, 118, 62, 0.1);
  border-color: var(--brass);
  transform: translateY(-2px);
}

/* 深色底上的描边按钮 */
.btn-ghost {
  color: var(--paper);
  border-color: rgba(233, 205, 156, 0.45);
}

.btn-ghost:hover {
  background: rgba(233, 205, 156, 0.12);
  border-color: var(--gold-1);
}

/* Hero 主行动：纸白底墨蓝字 */
.btn-light {
  background: var(--paper);
  color: var(--ink);
  border-color: rgba(245, 241, 232, 0.6);
  box-shadow: 0 18px 36px -18px rgba(5, 12, 17, 0.6);
}

.btn-light:hover {
  background: #fffdf6;
  transform: translateY(-2px);
  box-shadow: 0 24px 44px -18px rgba(5, 12, 17, 0.66);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 16px;
}

/* ---------- 等宽标签 / 烫金 ---------- */
.mono-label {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

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

/* ---------- HERO（深色沉浸） ---------- */
.hero {
  position: relative;
  padding: 150px 0 110px;
  background: var(--ink);
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.04) brightness(0.94);
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(14, 27, 35, 0.94) 0%, rgba(14, 27, 35, 0.8) 40%, rgba(14, 27, 35, 0.5) 100%),
    linear-gradient(180deg, rgba(14, 27, 35, 0.6) 0%, rgba(14, 27, 35, 0.15) 34%, rgba(14, 27, 35, 0.82) 100%);
}

.hero .mono-label {
  color: var(--gold-1);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 72px;
  align-items: center;
  padding-bottom: 92px;
}

.hero-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 30px 0 26px;
}

.hero-title em {
  font-style: italic;
  font-weight: 700;
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 17.5px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
  max-width: 33em;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-note {
  margin-top: 34px;
  color: var(--gold-1);
  letter-spacing: 0.22em;
}

/* ---------- 提单卡片 ---------- */
.btl-card {
  position: relative;
  background: linear-gradient(172deg, #fcf9f1 0%, #f2ecdc 100%);
  border: 1px solid rgba(14, 27, 35, 0.16);
  border-radius: 2px;
  box-shadow: var(--shadow-paper);
  padding: 30px 32px 26px;
  transform: rotate(1.1deg);
}

/* 烫金顶条 */
.btl-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gold-grad);
  border-radius: 2px 2px 0 0;
}

.btl-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
}

.btl-doc {
  font-family: var(--serif-en);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.05em;
}

.btl-no {
  color: var(--stamp-bright);
}

.btl-rows {
  padding: 18px 0 8px;
}

.btl-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(14, 27, 35, 0.24);
}

.btl-row dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  flex: none;
}

.btl-row dd {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  text-align: right;
}

.btl-foot {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 20px;
}

/* 条码装饰 */
.barcode {
  width: 128px;
  height: 34px;
  background: repeating-linear-gradient(
    90deg,
    var(--ink) 0 2px,
    transparent 2px 5px,
    var(--ink) 5px 9px,
    transparent 9px 11px,
    var(--ink) 11px 12px,
    transparent 12px 16px
  );
}

/* 双环印章 */
.stamp-badge {
  margin-left: auto;
  width: 76px;
  height: 76px;
  border: 1.5px solid var(--stamp-bright);
  outline: 1px solid rgba(192, 82, 60, 0.45);
  outline-offset: 3px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--stamp-bright);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-align: center;
  line-height: 1.55;
  transform: rotate(-9deg);
  opacity: 0.92;
}

.stamp-badge span {
  padding: 0 8px;
}

/* ---------- 数据条（深色 · 金线） ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--gold-line);
  border-bottom: 1px solid var(--gold-line);
}

.stat {
  padding: 36px 34px 32px;
  border-left: 1px solid rgba(201, 154, 91, 0.16);
}

.stat:first-child {
  border-left: none;
  padding-left: 4px;
}

.stat strong {
  display: block;
  font-family: var(--serif-en);
  font-weight: 600;
  font-size: clamp(36px, 3.6vw, 52px);
  line-height: 1.05;
  color: var(--paper);
  font-variant-numeric: lining-nums;
}

.stat strong i {
  font-style: italic;
  font-size: 0.6em;
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-left: 3px;
}

.stat span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 241, 232, 0.52);
}

/* ---------- 章节通用 ---------- */
.section-tag {
  color: var(--brass);
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 22px;
}

.section-tag::after {
  content: "";
  height: 1px;
  width: 76px;
  background: linear-gradient(90deg, rgba(168, 118, 62, 0.85), transparent);
}

.section-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(32px, 3.6vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.008em;
  max-width: 18em;
}

.section-sub {
  margin-top: 22px;
  color: var(--muted);
  font-size: 16.5px;
  max-width: 36em;
}

/* ---------- 业务定位 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 64px;
}

.about-card {
  background: var(--paper-card);
  border: 1px solid rgba(14, 27, 35, 0.13);
  border-radius: 2px;
  padding: 38px 34px 36px;
  position: relative;
  transition:
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

/* 金顶线 hover 浮现 */
.about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.about-card:hover::before {
  transform: scaleX(1);
}

.about-no {
  color: var(--brass);
  font-size: 13px;
}

.about-card h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.005em;
  margin: 16px 0 14px;
}

.about-card p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.pull-quote {
  position: relative;
  margin-top: 96px;
  border-left: 2px solid rgba(168, 118, 62, 0.65);
  padding: 14px 0 14px 56px;
  max-width: 900px;
}

.pull-quote::before {
  content: "\201C";
  position: absolute;
  left: 10px;
  top: -26px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 120px;
  line-height: 1;
  color: rgba(168, 118, 62, 0.24);
  pointer-events: none;
}

.pull-quote p {
  font-family: var(--serif);
  font-weight: 500;
  font-style: italic;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.65;
  color: var(--ink);
}

.pull-quote cite {
  display: block;
  margin-top: 20px;
  font-style: normal;
}

/* ---------- 品类矩阵 ---------- */
.section-paper {
  background: var(--paper-deep);
  border-top: 1px solid rgba(14, 27, 35, 0.1);
  border-bottom: 1px solid rgba(14, 27, 35, 0.1);
}

.section-paper::before {
  -webkit-text-stroke: 1px rgba(14, 27, 35, 0.12);
}

.cat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  margin-top: 64px;
  background: rgba(14, 27, 35, 0.14);
  border: 1px solid rgba(14, 27, 35, 0.14);
}

.cat-card {
  background: var(--paper-card);
  padding: 28px 24px 30px;
  position: relative;
  transition:
    background-color 0.3s var(--ease),
    color 0.3s var(--ease);
}

.cat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-grad);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}

.cat-card:hover {
  background: var(--ink);
}

.cat-card:hover::before {
  transform: scaleX(1);
}

.cat-no {
  display: block;
  font-size: 10.5px;
  color: var(--brass);
}

.cat-card h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.005em;
  margin: 14px 0 8px;
}

.cat-en {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.13em;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.cat-card:hover .cat-en {
  color: rgba(245, 241, 232, 0.6);
}

.cat-card:hover .cat-no {
  color: var(--gold-1);
}

.cat-footnote {
  margin-top: 34px;
  color: var(--stamp-bright);
}

/* ---------- 合作需求（墨蓝 + 金色光晕） ---------- */
.section-ink {
  background:
    radial-gradient(1000px 540px at 84% 10%, rgba(201, 154, 91, 0.14), transparent 62%),
    radial-gradient(760px 480px at 6% 92%, rgba(28, 58, 72, 0.55), transparent 62%),
    var(--ink);
  color: var(--paper);
  border-top: 1px solid rgba(201, 154, 91, 0.22);
}

.section-ink::before {
  -webkit-text-stroke: 1px rgba(245, 241, 232, 0.07);
}

.coop-grid {
  display: grid;
  grid-template-columns: 1.45fr 0.7fr;
  gap: 72px;
  align-items: center;
}

.coop-tag {
  color: var(--gold-1);
  margin-bottom: 22px;
}

.section-title-light {
  color: var(--paper);
}

.section-title-light em {
  font-style: italic;
  font-weight: 700;
  background: var(--gold-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.coop-sub {
  margin-top: 24px;
  color: rgba(245, 241, 232, 0.75);
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.85;
}

.coop-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  margin-top: 52px;
}

.coop-col h4 {
  color: var(--gold-1);
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(201, 154, 91, 0.3);
}

.coop-list {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.coop-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.9);
}

.coop-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 7px;
  background: var(--gold-2);
  transform: rotate(45deg);
}

.section-ink .hero-actions {
  margin-top: 52px;
}

/* 甲方印章区 */
.coop-stamp-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.stamp-circle {
  position: relative;
  width: 200px;
  height: 200px;
  border: 1px solid rgba(201, 154, 91, 0.5);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--stamp-bright);
  transform: rotate(-10deg);
  box-shadow: 0 0 0 8px rgba(201, 154, 91, 0.07), 0 24px 60px -24px rgba(0, 0, 0, 0.55);
}

.stamp-circle::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1.5px solid rgba(192, 82, 60, 0.85);
  border-radius: 50%;
}

.stamp-circle span {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 600;
  font-size: 19px;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
}

.stamp-circle i {
  display: block;
  width: 96px;
  height: 1px;
  background: rgba(192, 82, 60, 0.75);
}

.stamp-circle b {
  font-family: var(--serif-en);
  font-weight: 700;
  font-size: 34px;
  letter-spacing: 0.24em;
  text-indent: 0.24em;
}

.stamp-caption {
  color: rgba(245, 241, 232, 0.5);
}

.barcode-light {
  background: repeating-linear-gradient(
    90deg,
    rgba(233, 205, 156, 0.8) 0 2px,
    transparent 2px 5px,
    rgba(233, 205, 156, 0.8) 5px 9px,
    transparent 9px 11px,
    rgba(233, 205, 156, 0.8) 11px 12px,
    transparent 12px 16px
  );
}

/* ---------- 联系我们（双邮箱通道） ---------- */
.contact-card {
  margin-top: 60px;
  background: var(--paper-card);
  border: 1px solid rgba(168, 118, 62, 0.35);
  border-radius: 2px;
  box-shadow: var(--shadow-card);
  padding: 38px 44px 30px;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gold-grad);
}

.contact-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.contact-head-note {
  font-size: 10px;
  color: var(--muted);
}

.contact-entry {
  padding: 18px 0 22px;
}

.contact-entry + .contact-entry {
  border-top: 1px dashed rgba(14, 27, 35, 0.22);
}

.contact-role {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--brass);
  letter-spacing: 0.2em;
}

.role-dot {
  width: 6px;
  height: 6px;
  background: var(--gold-2);
  transform: rotate(45deg);
  flex: none;
}

.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.contact-mail {
  font-family: var(--serif-en);
  font-weight: 600;
  font-size: clamp(19px, 2.8vw, 30px);
  letter-spacing: -0.01em;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s var(--ease);
  word-break: break-all;
}

.contact-mail:hover {
  border-bottom-color: var(--brass);
}

.contact-mail-alt {
  font-size: clamp(16px, 2.1vw, 23px);
  font-weight: 500;
  color: var(--ink-soft);
}

.contact-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 11px 22px;
  font-size: 13.5px;
}

.contact-tip {
  display: block;
  min-height: 18px;
  margin-top: 6px;
  color: var(--stamp-bright);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(245, 241, 232, 0.75);
  padding: 64px 0 48px;
  border-top: 1px solid rgba(201, 154, 91, 0.22);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  text-align: center;
}

.footer-doc {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-doc .mono-label {
  color: rgba(245, 241, 232, 0.45);
}

.footer-brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 23px;
  color: var(--paper);
}

.footer-brand .mono-label {
  margin-left: 12px;
  font-size: 9.5px;
  color: var(--gold-1);
}

.footer-line {
  color: rgba(245, 241, 232, 0.5);
}

.footer-copy {
  font-size: 13px;
  color: rgba(245, 241, 232, 0.38);
}

/* ---------- 滚动渐显 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .btl-card {
    max-width: 520px;
    justify-self: center;
  }

  .cat-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .coop-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .coop-stamp-zone {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(3) {
    border-left: none;
    padding-left: 4px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 92px 0;
  }

  .section::before {
    font-size: clamp(90px, 22vw, 150px);
    top: 10px;
  }

  .hero {
    padding: 96px 0 72px;
  }

  .hero-grid {
    padding-bottom: 64px;
  }

  .nav-links {
    display: none;
  }

  .topbar {
    justify-content: flex-start;
    gap: 12px;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .cat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .coop-columns {
    grid-template-columns: 1fr;
  }

  .stat {
    padding: 26px 22px 24px;
  }

  .contact-card {
    padding: 30px 24px 26px;
  }

  .contact-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .pull-quote {
    padding-left: 34px;
    margin-top: 72px;
  }

  .stamp-circle {
    width: 156px;
    height: 156px;
  }

  .stamp-circle b {
    font-size: 26px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .topbar-caret {
    animation: none;
  }
}