/* ==========================================================================
   福锦创建站 fjjuchuang.com - 全站主样式表
   风格：美甲简约风（奶白 + 亮粉 + 浅灰）
   布局：折线立体分割布局，不规则折线边缘，非通用独特骨架
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：奶白系（纯净基底） */
  --cream-50:  #FDFBF9;
  --cream-100: #FAF6F2;
  --cream-200: #F5EDE6;
  --cream-300: #EDE3D8;
  --cream-400: #E0D3C4;
  --cream-500: #C9B8A5;

  /* 辅色：亮粉系（年轻活力） */
  --pink-50:  #FFF0F5;
  --pink-100: #FFE4EE;
  --pink-200: #FFC8DD;
  --pink-300: #FF8FAB;
  --pink-400: #FF6B9D;
  --pink-500: #FF4F8B;
  --pink-600: #E63E78;
  --pink-700: #C42D63;

  /* 中性：浅灰与墨色 */
  --gray-50:  #F7F5F3;
  --gray-100: #E8E4E1;
  --gray-200: #D4CFC9;
  --gray-300: #B8B2AB;
  --gray-400: #9A9590;
  --ink-900: #2D2A28;
  --ink-700: #4A4643;
  --ink-500: #6B6661;
  --ink-300: #9A9590;
  --line:    #E0DAD4;
  --line-soft: #F0EBE6;

  /* 功能 */
  --radius-sm: 6px;
  --radius:    14px;
  --radius-lg: 24px;
  --shadow-sm: 0 4px 14px rgba(255, 79, 139, 0.06);
  --shadow:    0 14px 40px rgba(255, 79, 139, 0.10);
  --shadow-lg: 0 24px 56px rgba(255, 79, 139, 0.16);
  --container: 1220px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--cream-100);
  overflow-x: hidden;
}
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(--pink-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-900);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3.1rem); }
h2 { font-size: clamp(1.55rem, 2.6vw, 2.3rem); }
h3 { font-size: clamp(1.2rem, 1.7vw, 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 26px;
}
.container-narrow { max-width: 860px; }
.container-wide   { max-width: 1400px; }
section { position: relative; }

/* ==========================================================================
   折线立体分割布局系统（核心骨架）
   使用 clip-path、skew、伪元素创建不规则折线/斜切边缘
   ========================================================================== */

/* 折线分割带：上下边缘不规则折线 */
.fold-divider {
  position: relative;
  height: 36px;
  background: var(--cream-100);
}
.fold-divider::before,
.fold-divider::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 18px;
  background-image:
    linear-gradient(135deg, var(--pink-100) 25%, transparent 25%),
    linear-gradient(225deg, var(--pink-100) 25%, transparent 25%);
  background-size: 36px 36px;
  background-position: 0 0;
}
.fold-divider::before { top: 0; }
.fold-divider::after { bottom: 0; transform: rotate(180deg); }

/* 折线边缘卡片 - 斜切角 */
.fold-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius);
  padding: 34px 30px;
  transition: all .4s var(--ease-out);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}
.fold-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--pink-400), var(--pink-300), var(--gray-200));
}
.fold-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

/* 不规则折线区块背景 - 斜切顶部 */
.angled-section {
  position: relative;
  padding: 90px 0;
}
.angled-section::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 28px;
  background:
    linear-gradient(135deg, var(--cream-100) 33.33%, transparent 33.33%) 0 0 / 56px 28px,
    linear-gradient(225deg, var(--cream-100) 33.33%, transparent 33.33%) 0 0 / 56px 28px;
  background-repeat: repeat-x;
}
.angled-section.pink-bg { background: var(--pink-50); }
.angled-section.cream-bg { background: var(--cream-50); }
.angled-section.gray-bg { background: var(--gray-50); }
.angled-section.white-bg { background: #fff; }

/* 斜切面板 - 左右不对称折线 */
.bevel-panel {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 44px;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.bevel-panel::before {
  content: "";
  position: absolute;
  top: -6px; left: 36px;
  width: 72px; height: 12px;
  background: var(--pink-300);
  clip-path: polygon(0 100%, 8% 0, 16% 100%, 24% 0, 32% 100%, 40% 0, 48% 100%, 56% 0, 64% 100%, 72% 0, 80% 100%, 88% 0, 96% 100%, 100% 0);
}

/* 拼色网格 - 折线分割单元格 */
.patch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.patch-cell {
  background: #fff;
  border: 1.5px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 30px 26px;
  position: relative;
  transition: transform .4s var(--ease-out), box-shadow .4s var(--ease-out), border-color .4s var(--ease-out);
  overflow: hidden;
}
.patch-cell::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--pink-400), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s var(--ease-out);
}
.patch-cell:nth-child(6n+1) { background: var(--cream-50); }
.patch-cell:nth-child(6n+3) { background: var(--pink-50); }
.patch-cell:nth-child(6n+5) { background: var(--gray-50); }
.patch-cell:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--pink-200); }
.patch-cell:hover::after { transform: scaleX(1); }

/* 立体折面 - 3D感折叠面板 */
.fold-3d {
  position: relative;
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: all .4s var(--ease-out);
  transform-style: preserve-3d;
}
.fold-3d::before {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 60px; height: 60px;
  background: linear-gradient(225deg, var(--pink-100) 50%, transparent 50%);
  border-radius: 0 var(--radius) 0 0;
}
.fold-3d:hover { transform: translateY(-4px) rotateX(2deg); box-shadow: var(--shadow); }

/* ==========================================================================
   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, 242, 0.85);
  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, 242, 0.97);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.2rem; color: var(--ink-900);
  letter-spacing: 0.02em;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand .brand-mark {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--pink-400), var(--pink-500));
  display: grid; place-items: center; color: #fff;
  font-size: 1.1rem; font-weight: 900;
  box-shadow: 0 4px 12px rgba(255, 79, 139, 0.3);
  position: relative;
}
.brand .brand-mark::after {
  content: "";
  position: absolute;
  bottom: -3px; right: -3px;
  width: 12px; height: 12px;
  background: var(--cream-200);
  border-radius: 3px;
  transform: rotate(45deg);
}
.brand-text small { display: block; font-size: 0.65rem; font-weight: 400; color: var(--ink-300); letter-spacing: 0.16em; }

.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav > li { position: relative; }
.main-nav > li > a {
  display: block;
  padding: 9px 14px;
  font-size: 0.92rem;
  color: var(--ink-700);
  border-radius: 8px;
  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(--pink-400);
  border-radius: 2px;
  transition: all .3s var(--ease);
  transform: translateX(-50%);
}
.main-nav > li > a:hover,
.main-nav > li.active > a {
  color: var(--pink-500);
  background: var(--pink-50);
}
.main-nav > li > a:hover::after,
.main-nav > li.active > a::after { width: 18px; }

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px); left: 0;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 8px;
  opacity: 0; visibility: hidden;
  transform: translateY(8px);
  transition: all .3s var(--ease);
}
.dropdown-menu::before {
  content: "";
  position: absolute;
  top: -5px; left: 22px;
  width: 10px; height: 10px;
  background: #fff;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
  transform: rotate(45deg);
}
.main-nav li:hover > .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu li a {
  display: block;
  padding: 9px 14px;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--ink-700);
  transition: all .25s var(--ease);
}
.dropdown-menu li a:hover { background: var(--pink-50); color: var(--pink-500); padding-left: 18px; }

.nav-cta {
  margin-left: 8px;
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--pink-400), var(--pink-500));
  color: #fff;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all .3s var(--ease);
  box-shadow: 0 4px 14px rgba(255, 79, 139, 0.28);
}
.nav-cta:hover { background: linear-gradient(135deg, var(--pink-500), var(--pink-600)); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255, 79, 139, 0.36); }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--pink-50);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--ink-700);
  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: 74px; right: 0;
  width: 80%; max-width: 320px;
  height: calc(100vh - 74px);
  background: #fff;
  border-left: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  padding: 20px;
  transform: translateX(100%);
  transition: transform .35s var(--ease-out);
  overflow-y: auto;
  z-index: 999;
}
.mobile-drawer.open { transform: translateX(0); }
.mobile-drawer li a {
  display: block;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-700);
  font-weight: 500;
  border-radius: 6px;
  font-size: 0.94rem;
}
.mobile-drawer li a:hover { color: var(--pink-500); background: var(--pink-50); }
.mobile-sub { padding-left: 18px; }
.overlay {
  position: fixed; inset: 0;
  background: rgba(45, 42, 40, 0.4);
  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: 11px 26px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  transition: all .35s var(--ease-out);
  border: 1.5px solid transparent;
  cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--pink-400), var(--pink-500)); color: #fff; box-shadow: 0 4px 14px rgba(255, 79, 139, 0.26); }
.btn-primary:hover { background: linear-gradient(135deg, var(--pink-500), var(--pink-600)); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255, 79, 139, 0.34); }
.btn-outline { border-color: var(--pink-300); color: var(--pink-500); background: #fff; }
.btn-outline:hover { background: var(--pink-50); color: var(--pink-600); transform: translateY(-2px); border-color: var(--pink-400); }
.btn-ghost { color: var(--ink-700); border-color: var(--gray-200); }
.btn-ghost:hover { border-color: var(--pink-300); color: var(--pink-500); background: var(--pink-50); }
.btn-dark { background: var(--ink-900); color: #fff; }
.btn-dark:hover { background: var(--ink-700); color: #fff; transform: translateY(-2px); }
.btn-lg { padding: 15px 34px; font-size: 1rem; }
.btn-sm { padding: 8px 18px; font-size: 0.84rem; }

.txt-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--pink-500); font-weight: 600; font-size: 0.9rem;
  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(--pink-300); }
.txt-link:hover::after { transform: translateX(4px); }

/* ==========================================================================
   板块标题
   ========================================================================== */
.section { padding: 90px 0; }
.section-tight { padding: 56px 0; }
.section-cream { background: var(--cream-50); }
.section-pink  { background: var(--pink-50); }
.section-gray  { background: var(--gray-50); }
.section-white { background: #fff; }
.section-dark  { background: var(--ink-900); color: #D8D2CC; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark p { color: #A8A29C; }

.section-head { max-width: 700px; margin-bottom: 50px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 14px;
  background: var(--pink-100);
  color: var(--pink-600);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.eyebrow.gray { background: var(--gray-100); color: var(--ink-500); }
.eyebrow.dark { background: rgba(255,255,255,0.1); color: var(--pink-200); }
.section-head p { font-size: 1rem; color: var(--ink-500); margin-top: 12px; }
.section-head.center p { margin-left: auto; margin-right: auto; }

/* 折线装饰标记 */
.fold-mark {
  display: inline-grid;
  place-items: center;
  width: 26px; height: 26px;
  background: linear-gradient(135deg, var(--pink-300), var(--pink-400));
  border-radius: 5px;
  color: #fff;
  font-weight: 900;
  font-size: 0.7rem;
  margin-right: 8px;
  vertical-align: middle;
  clip-path: polygon(0 15%, 12% 0, 25% 15%, 37% 0, 50% 15%, 62% 0, 75% 15%, 87% 0, 100% 15%, 100% 85%, 88% 100%, 75% 85%, 62% 100%, 50% 85%, 37% 100%, 25% 85%, 12% 100%, 0 85%);
}

/* ==========================================================================
   卡片
   ========================================================================== */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  transition: all .4s var(--ease-out);
  height: 100%;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--pink-200); }
.card-img { border-radius: var(--radius); overflow: hidden; margin-bottom: 20px; position: relative; }
.card-img img { width: 100%; height: 220px; object-fit: cover; transition: transform .6s var(--ease-out); }
.card:hover .card-img img { transform: scale(1.05); }
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.92rem; }

/* 缝线/虚线卡片 */
.stitch-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 34px 30px;
  border: 1.5px dashed var(--pink-200);
  position: relative;
  transition: all .4s var(--ease-out);
}
.stitch-card::before {
  content: "";
  position: absolute; inset: 7px;
  border: 1px solid var(--line-soft);
  border-radius: calc(var(--radius) - 5px);
  pointer-events: none;
}
.stitch-card:hover { background: var(--pink-50); transform: translateY(-4px); border-color: var(--pink-300); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-900);
  color: #B8B2AB;
  padding: 72px 0 0;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 22px;
  background:
    linear-gradient(135deg, var(--ink-900) 33.33%, transparent 33.33%) 0 0 / 44px 22px,
    linear-gradient(225deg, var(--ink-900) 33.33%, transparent 33.33%) 0 0 / 44px 22px;
  background-repeat: repeat-x;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr 1.1fr;
  gap: 44px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}
.footer-col h4 { color: #fff; font-size: 0.96rem; margin-bottom: 20px; letter-spacing: 0.03em; }
.footer-col p { color: #9A9590; font-size: 0.88rem; line-height: 1.8; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #B8B2AB; font-size: 0.88rem; transition: all .3s var(--ease); }
.footer-col ul li a:hover { color: var(--pink-300); padding-left: 5px; }
.footer-contact li { display: flex; gap: 9px; align-items: flex-start; margin-bottom: 12px; font-size: 0.88rem; color: #B8B2AB; }
.footer-contact .ic { color: var(--pink-300); flex-shrink: 0; margin-top: 2px; }
.footer-bottom {
  padding: 22px 0;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px;
  font-size: 0.82rem; color: #7D7873;
}
.footer-bottom a { color: #7D7873; }
.footer-bottom a:hover { color: var(--pink-300); }
.footer-icp a { color: #9A9590; }
.footer-social { display: flex; gap: 9px; margin-top: 16px; }
.footer-social a {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.14);
  display: grid; place-items: center;
  color: #B8B2AB;
  transition: all .3s var(--ease);
}
.footer-social a:hover { background: var(--pink-500); color: #fff; border-color: var(--pink-500); }

/* ==========================================================================
   页面通用：面包屑、页头横幅
   ========================================================================== */
.page-hero {
  padding: 140px 0 64px;
  background:
    radial-gradient(ellipse at 15% 20%, var(--pink-100) 0%, transparent 45%),
    radial-gradient(ellipse at 85% 80%, var(--gray-100) 0%, transparent 48%),
    var(--cream-100);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -1px;
  width: 90px; height: 4px;
  background: linear-gradient(90deg, var(--pink-400), var(--pink-300), var(--gray-200));
  transform: translateX(-50%);
  border-radius: 3px;
}
/* 折线装饰背景 */
.page-hero::before {
  content: "";
  position: absolute;
  top: 0; right: -50px;
  width: 300px; height: 300px;
  background:
    linear-gradient(135deg, transparent 48%, var(--pink-100) 48%, var(--pink-100) 52%, transparent 52%),
    linear-gradient(45deg, transparent 48%, var(--gray-100) 48%, var(--gray-100) 52%, transparent 52%);
  background-size: 40px 40px;
  opacity: 0.5;
  transform: rotate(15deg);
}
.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 7px; align-items: center;
  font-size: 0.84rem; color: var(--ink-300);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.breadcrumb a:hover { color: var(--pink-500); }
.breadcrumb span.sep { color: var(--gray-300); }
.page-hero h1 { margin-bottom: 14px; position: relative; z-index: 1; }
.page-hero p { font-size: 1.05rem; max-width: 660px; position: relative; z-index: 1; }

/* ==========================================================================
   表单
   ========================================================================== */
.form-row { margin-bottom: 18px; }
.form-label { display: block; font-size: 0.88rem; color: var(--ink-700); margin-bottom: 7px; font-weight: 500; }
.form-label .req { color: var(--pink-500); }
.form-control {
  width: 100%;
  padding: 12px 16px;
  background: #fff;
  border: 1.5px solid var(--gray-100);
  border-radius: 10px;
  font-size: 0.94rem;
  transition: all .3s var(--ease);
  color: var(--ink-700);
}
.form-control:focus {
  outline: none;
  border-color: var(--pink-300);
  box-shadow: 0 0 0 3px var(--pink-100);
}
.form-control::placeholder { color: var(--gray-300); }
textarea.form-control { min-height: 130px; resize: vertical; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-tip { font-size: 0.84rem; color: var(--ink-300); margin-top: 6px; }

/* ==========================================================================
   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: 14px; }
.mt-4 { margin-top: 28px; }
.mb-2 { margin-bottom: 14px; }
.mb-4 { margin-bottom: 28px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.flex   { display: flex; }
.flex-center { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 7px; } .gap-2 { gap: 14px; } .gap-3 { gap: 22px; }
.tag {
  display: inline-block; padding: 3px 11px;
  background: var(--pink-100); color: var(--pink-600);
  border-radius: 999px; font-size: 0.76rem; font-weight: 500;
}
.tag.gray { background: var(--gray-100); color: var(--ink-500); }
.tag.dark { background: var(--ink-900); color: #fff; }

/* ==========================================================================
   滚动渐入动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .75s var(--ease-out), transform .75s var(--ease-out);
}
.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; }

/* 装饰：折线网格背景 */
.bg-fold-grid {
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* 装饰：斜线条纹 */
.bg-stripes {
  background: repeating-linear-gradient(
    -45deg,
    var(--pink-50),
    var(--pink-50) 10px,
    var(--cream-50) 10px,
    var(--cream-50) 20px
  );
}

/* 返回顶部 */
.back-to-top {
  position: fixed; right: 22px; bottom: 22px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--pink-500);
  color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--shadow);
  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(--pink-600); transform: translateY(-3px); }