/* ==========================================================================
   众远标筑 zybzz.cn - 全站主样式表
   风格：国风汉服风（朱红 + 米白 + 墨黑）
   布局：中轴卷轴式布局（对称中轴、卷轴展开、印章点缀）
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：朱红系（汉服正色） */
  --red-50:  #FDF2F0;
  --red-100: #F9E0DC;
  --red-200: #F0B8B0;
  --red-300: #E58A7E;
  --red-400: #D95C4D;
  --red-500: #C8392E;  /* 主朱红 */
  --red-600: #A82A1F;  /* 深朱红 */
  --red-700: #8A1F16;
  --red-800: #6B1710;

  /* 辅色：米白系（宣纸质感） */
  --cream-50:  #FDFBF5;
  --cream-100: #FAF6EC;  /* 主米白 */
  --cream-200: #F5EFE0;  /* 深米白 */
  --cream-300: #EDE4CE;
  --cream-400: #E0D4B5;

  /* 中性：墨黑系 */
  --ink-50:  #F5F5F5;
  --ink-100: #E8E8E8;
  --ink-200: #D4D4D4;
  --ink-300: #A3A3A3;
  --ink-400: #737373;
  --ink-500: #525252;
  --ink-600: #404040;
  --ink-700: #2C2C2C;  /* 深墨 */
  --ink-800: #1A1A1A;  /* 主墨黑 */
  --ink-900: #0D0D0D;

  /* 金（点缀，汉服镶边感） */
  --gold-300: #D4B87A;
  --gold-400: #C4A35A;
  --gold-500: #B08D3E;

  /* 功能 */
  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 16px;
  --shadow-sm: 0 4px 14px rgba(26, 26, 26, 0.06);
  --shadow:    0 14px 40px rgba(26, 26, 26, 0.10);
  --shadow-lg: 0 24px 60px rgba(26, 26, 26, 0.18);
  --shadow-red: 0 10px 30px rgba(200, 57, 46, 0.25);
  --container: 1240px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 80px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-600);
  background: var(--cream-100);
  overflow-x: hidden;
}
/* 宣纸纹理背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(200,57,46,0.02) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(176,141,62,0.02) 0%, transparent 40%);
}
img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: inherit; text-decoration: none; transition: color .3s var(--ease); }
a:hover { color: var(--red-500); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5 {
  color: var(--ink-800);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.5rem); }
h4 { font-size: 1.1rem; }
p  { color: var(--ink-500); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}
.container-narrow { max-width: 880px; }
.container-wide   { max-width: 1440px; }
section { position: relative; }

/* ==========================================================================
   国风装饰元素：回纹边框、印章、云纹
   ========================================================================== */

/* 回纹边框（中式连续回字纹） */
.hui-border {
  position: relative;
  border: 2px solid var(--red-500);
}
.hui-border::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid var(--red-300);
  pointer-events: none;
}

/* 印章样式 */
.seal {
  display: inline-grid;
  place-items: center;
  background: var(--red-500);
  color: var(--cream-100);
  font-weight: 700;
  letter-spacing: 0.1em;
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 0.85rem;
  box-shadow: 2px 2px 0 rgba(26,26,26,0.15);
  transform: rotate(-2deg);
}
.seal-lg {
  width: 72px; height: 72px;
  padding: 0;
  font-size: 1.1rem;
  line-height: 1.2;
  text-align: center;
  border-radius: 6px;
}

/* 中式分隔线（两端回纹） */
.cn-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 32px 0;
}
.cn-divider::before,
.cn-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--red-300), transparent);
}
.cn-divider .dot {
  width: 8px; height: 8px;
  background: var(--red-500);
  transform: rotate(45deg);
}

/* 云纹装饰角 */
.cloud-corner {
  position: absolute;
  width: 60px; height: 60px;
  opacity: 0.15;
  pointer-events: none;
}
.cloud-corner.tl { top: 16px; left: 16px; }
.cloud-corner.tr { top: 16px; right: 16px; transform: scaleX(-1); }
.cloud-corner.bl { bottom: 16px; left: 16px; transform: scaleY(-1); }
.cloud-corner.br { bottom: 16px; right: 16px; transform: scale(-1,-1); }

/* 卷轴展开容器 */
.scroll-panel {
  position: relative;
  background: var(--cream-50);
  border-left: 3px solid var(--red-500);
  border-right: 3px solid var(--red-500);
  padding: 40px 36px;
}
.scroll-panel::before,
.scroll-panel::after {
  content: "";
  position: absolute;
  left: -3px; right: -3px;
  height: 14px;
  background: linear-gradient(to bottom, var(--red-600), var(--red-500), var(--red-600));
  border-radius: 2px;
}
.scroll-panel::before { top: -14px; }
.scroll-panel::after { bottom: -14px; }

/* ==========================================================================
   顶部导航（固定，滚动变色，移动端汉堡菜单）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(250, 246, 236, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}
.site-header.scrolled {
  background: rgba(250, 246, 236, 0.97);
  border-bottom-color: var(--cream-300);
  box-shadow: var(--shadow-sm);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-weight: 700; font-size: 1.3rem; color: var(--ink-800);
  letter-spacing: 0.04em;
}
.brand img { width: 44px; height: 44px; border-radius: 4px; }
.brand .brand-mark {
  width: 44px; height: 44px;
  background: var(--red-500);
  color: var(--cream-100);
  display: grid; place-items: center;
  font-size: 1.2rem; font-weight: 900;
  border-radius: 4px;
  box-shadow: 2px 2px 0 var(--ink-800);
  letter-spacing: 0;
}
.brand-text small {
  display: block;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--ink-400);
  letter-spacing: 0.2em;
  margin-top: 2px;
}

.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav > li { position: relative; }
.main-nav > li > a {
  display: block;
  padding: 10px 16px;
  font-size: 0.95rem;
  color: var(--ink-700);
  border-radius: 4px;
  transition: all .3s var(--ease);
  position: relative;
}
.main-nav > li > a::after {
  content: "";
  position: absolute;
  bottom: 4px; left: 50%;
  width: 0; height: 2px;
  background: var(--red-500);
  transition: all .3s var(--ease);
  transform: translateX(-50%);
}
.main-nav > li > a:hover,
.main-nav > li.active > a {
  color: var(--red-600);
}
.main-nav > li > a:hover::after,
.main-nav > li.active > a::after {
  width: 20px;
}
/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px); left: 0;
  min-width: 210px;
  background: var(--cream-50);
  border: 1px solid var(--cream-300);
  border-top: 3px solid var(--red-500);
  border-radius: 4px;
  box-shadow: var(--shadow);
  padding: 10px;
  opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: all .3s var(--ease);
}
.main-nav li:hover > .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu li a {
  display: block;
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 0.92rem;
  color: var(--ink-700);
  border-bottom: 1px dashed var(--cream-300);
  transition: all .25s var(--ease);
}
.dropdown-menu li:last-child a { border-bottom: 0; }
.dropdown-menu li a:hover {
  background: var(--red-50);
  color: var(--red-600);
  padding-left: 20px;
}

.nav-cta {
  margin-left: 14px;
  padding: 10px 24px;
  background: var(--red-500);
  color: var(--cream-100) !important;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all .3s var(--ease);
  border: 1px solid var(--red-500);
}
.nav-cta:hover {
  background: var(--red-600);
  color: var(--cream-100) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-red);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 4px;
  background: var(--red-50);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--ink-800);
  border-radius: 2px;
  transition: all .3s var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动抽屉 */
.mobile-drawer {
  position: fixed;
  top: var(--header-h); right: 0;
  width: 82%; max-width: 340px;
  height: calc(100vh - var(--header-h));
  background: var(--cream-50);
  border-left: 3px solid var(--red-500);
  box-shadow: var(--shadow-lg);
  padding: 20px;
  transform: translateX(100%);
  transition: transform .35s var(--ease);
  overflow-y: auto;
  z-index: 999;
}
.mobile-drawer.open { transform: translateX(0); }
.mobile-drawer li a {
  display: block;
  padding: 14px 16px;
  border-bottom: 1px dashed var(--cream-300);
  color: var(--ink-700);
  font-weight: 500;
  font-size: 0.95rem;
}
.mobile-drawer li a:hover { color: var(--red-600); background: var(--red-50); }
.mobile-sub { padding-left: 20px; }
.overlay {
  position: fixed; inset: 0;
  background: rgba(26, 26, 26, 0.5);
  opacity: 0; visibility: hidden;
  transition: all .3s var(--ease);
  z-index: 998;
}
.overlay.show { opacity: 1; visibility: visible; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all .35s var(--ease);
  border: 1px solid transparent;
  cursor: pointer;
  letter-spacing: 0.02em;
}
.btn-primary {
  background: var(--red-500);
  color: var(--cream-100);
  box-shadow: 3px 3px 0 var(--ink-800);
}
.btn-primary:hover {
  background: var(--red-600);
  color: var(--cream-100);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink-800);
}
.btn-outline {
  border-color: var(--red-500);
  color: var(--red-600);
  background: transparent;
}
.btn-outline:hover {
  background: var(--red-500);
  color: var(--cream-100);
  transform: translateY(-2px);
}
.btn-ghost {
  color: var(--ink-700);
  border-color: var(--ink-200);
  background: var(--cream-50);
}
.btn-ghost:hover {
  border-color: var(--red-400);
  color: var(--red-600);
  background: var(--red-50);
}
.btn-dark {
  background: var(--ink-800);
  color: var(--cream-100);
}
.btn-dark:hover {
  background: var(--ink-700);
  color: var(--cream-100);
  transform: translateY(-2px);
}
.btn-gold {
  background: var(--gold-400);
  color: var(--ink-800);
}
.btn-gold:hover {
  background: var(--gold-500);
  color: var(--cream-100);
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

.txt-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--red-600); font-weight: 600; font-size: 0.92rem;
  border-bottom: 1px solid transparent;
  transition: all .3s var(--ease);
}
.txt-link::after { content: "→"; transition: transform .3s var(--ease); }
.txt-link:hover { border-bottom-color: var(--red-400); }
.txt-link:hover::after { transform: translateX(4px); }

/* ==========================================================================
   板块标题
   ========================================================================== */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-cream { background: var(--cream-200); }
.section-paper { background: var(--cream-100); }
.section-white { background: var(--cream-50); }
.section-red   { background: var(--red-500); color: var(--cream-100); }
.section-red h2, .section-red h3 { color: var(--cream-100); }
.section-red p { color: rgba(250,246,236,0.85); }
.section-dark  { background: var(--ink-800); color: #D4D4D4; }
.section-dark h2, .section-dark h3 { color: var(--cream-100); }
.section-dark p { color: #A3A3A3; }

.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 16px;
  background: var(--red-50);
  color: var(--red-600);
  border-radius: 2px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  margin-bottom: 18px;
  border-left: 3px solid var(--red-500);
}
.eyebrow.gold { background: rgba(196,163,90,0.12); color: var(--gold-500); border-left-color: var(--gold-400); }
.eyebrow.dark { background: rgba(255,255,255,0.08); color: var(--cream-300); border-left-color: var(--gold-400); }
.section-head p { font-size: 1.05rem; color: var(--ink-500); margin-top: 14px; }
.section-head.center p { margin-left: auto; margin-right: auto; }

/* 标题印章装饰 */
.title-seal {
  display: inline-block;
  width: 36px; height: 36px;
  background: var(--red-500);
  color: var(--cream-100);
  font-size: 0.85rem;
  font-weight: 900;
  display: inline-grid;
  place-items: center;
  border-radius: 3px;
  margin-right: 12px;
  vertical-align: middle;
  box-shadow: 2px 2px 0 rgba(26,26,26,0.2);
}

/* ==========================================================================
   卡片
   ========================================================================== */
.card {
  background: var(--cream-50);
  border: 1px solid var(--cream-300);
  border-radius: 4px;
  padding: 32px;
  transition: all .4s var(--ease);
  height: 100%;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 0; height: 3px;
  background: var(--red-500);
  transition: width .4s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--red-200);
}
.card:hover::before { width: 100%; }
.card-img {
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 22px;
  position: relative;
}
.card-img img {
  width: 100%; height: 220px;
  object-fit: cover;
  transition: transform .6s var(--ease);
}
.card:hover .card-img img { transform: scale(1.06); }
.card h3 { margin-bottom: 12px; }
.card p { font-size: 0.95rem; }

/* 墨边卡片（深色边框） */
.ink-card {
  background: var(--cream-50);
  border: 2px solid var(--ink-800);
  border-radius: 4px;
  padding: 32px;
  position: relative;
  transition: all .4s var(--ease);
  height: 100%;
}
.ink-card::after {
  content: "";
  position: absolute;
  top: 6px; left: 6px; right: -6px; bottom: -6px;
  border: 1px solid var(--red-300);
  border-radius: 4px;
  z-index: -1;
  transition: all .4s var(--ease);
}
.ink-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--ink-800);
}
.ink-card:hover::after {
  top: 10px; left: 10px;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-800);
  color: #B0B0B0;
  padding: 80px 0 0;
  position: relative;
  border-top: 4px solid var(--red-500);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 4px; left: 0; right: 0;
  height: 1px;
  background: var(--gold-400);
  opacity: 0.4;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-col h4 {
  color: var(--cream-100);
  font-size: 1rem;
  margin-bottom: 22px;
  letter-spacing: 0.06em;
  position: relative;
  padding-bottom: 10px;
}
.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  width: 32px; height: 2px;
  background: var(--red-500);
}
.footer-col p { color: #8A8A8A; font-size: 0.92rem; line-height: 1.9; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
  color: #B0B0B0;
  font-size: 0.92rem;
  transition: all .3s var(--ease);
  display: inline-block;
}
.footer-col ul li a:hover {
  color: var(--red-300);
  padding-left: 6px;
}
.footer-brand img,
.footer-brand .brand-mark { /* keep as-is for light logo */ }
.footer-contact li {
  display: flex; gap: 10px; align-items: flex-start;
  margin-bottom: 14px; font-size: 0.92rem; color: #B0B0B0;
}
.footer-contact .ic {
  color: var(--red-400);
  flex-shrink: 0;
  margin-top: 3px;
}
.footer-bottom {
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: #737373;
}
.footer-bottom a { color: #737373; }
.footer-bottom a:hover { color: var(--red-300); }
.footer-icp a { color: #8A8A8A; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 38px; height: 38px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.15);
  display: grid; place-items: center;
  color: #B0B0B0;
  transition: all .3s var(--ease);
}
.footer-social a:hover {
  background: var(--red-500);
  color: var(--cream-100);
  border-color: var(--red-500);
  transform: translateY(-2px);
}

/* ==========================================================================
   页面通用：面包屑、页头横幅
   ========================================================================== */
.page-hero {
  padding: 160px 0 80px;
  background:
    linear-gradient(135deg, rgba(200,57,46,0.04) 0%, transparent 50%),
    linear-gradient(225deg, rgba(176,141,62,0.04) 0%, transparent 50%),
    var(--cream-100);
  border-bottom: 1px solid var(--cream-300);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: repeating-linear-gradient(to right, var(--red-500) 0 30px, transparent 30px 40px, var(--gold-400) 40px 70px, transparent 70px 80px);
  opacity: 0.6;
}
.page-hero::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -1px;
  width: 100px; height: 4px;
  background: var(--red-500);
  transform: translateX(-50%);
}
.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  font-size: 0.86rem; color: var(--ink-400);
  margin-bottom: 20px;
}
.breadcrumb a:hover { color: var(--red-600); }
.breadcrumb span.sep { color: var(--ink-300); }
.page-hero h1 {
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}
.page-hero h1::after {
  content: "";
  position: absolute;
  bottom: -8px; left: 0;
  width: 60px; height: 3px;
  background: var(--red-500);
}
.page-hero p { font-size: 1.08rem; max-width: 680px; margin-top: 20px; }

/* ==========================================================================
   表单
   ========================================================================== */
.form-row { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.9rem;
  color: var(--ink-700);
  margin-bottom: 8px;
  font-weight: 500;
}
.form-label .req { color: var(--red-500); }
.form-control {
  width: 100%;
  padding: 14px 18px;
  background: var(--cream-50);
  border: 1px solid var(--cream-300);
  border-radius: 4px;
  font-size: 0.96rem;
  transition: all .3s var(--ease);
  color: var(--ink-700);
}
.form-control:focus {
  outline: none;
  border-color: var(--red-400);
  box-shadow: 0 0 0 4px rgba(200,57,46,0.08);
  background: #fff;
}
textarea.form-control { min-height: 140px; resize: vertical; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ==========================================================================
   工具类
   ========================================================================== */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.flex   { display: flex; }
.flex-center { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 8px; } .gap-2 { gap: 16px; } .gap-3 { gap: 24px; }
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--red-50);
  color: var(--red-600);
  border-radius: 2px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid var(--red-200);
}
.tag.gold { background: rgba(196,163,90,0.1); color: var(--gold-500); border-color: var(--gold-300); }
.tag.dark { background: var(--ink-800); color: var(--cream-100); border-color: var(--ink-700); }

/* ==========================================================================
   滚动渐入动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 48px; height: 48px;
  border-radius: 4px;
  background: var(--red-500);
  color: var(--cream-100);
  display: grid;
  place-items: center;
  box-shadow: 3px 3px 0 var(--ink-800);
  opacity: 0; visibility: hidden;
  transition: all .3s var(--ease);
  z-index: 900;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover {
  background: var(--red-600);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink-800);
}

/* 数字计数 */
.counter-num {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--red-500);
  line-height: 1;
  letter-spacing: -0.02em;
}
.counter-label {
  font-size: 0.9rem;
  color: var(--ink-500);
  margin-top: 8px;
}