/* ==========================================================================
   三迪思卡特建站 3dscart.com - 全站主样式表
   风格：袜子元气风（浅黄 + 浅蓝 + 纯白）
   布局：纵向时间轴动态加粗线条布局
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：浅黄系（袜子元气感） */
  --sock-yellow-50:  #FFFBEB;
  --sock-yellow-100: #FFF3C4;
  --sock-yellow-200: #FFE88A;
  --sock-yellow-300: #FFD95A;
  --sock-yellow-400: #FFC928;
  --sock-yellow-500: #F5B800;
  --sock-yellow-600: #D49E00;
  --sock-yellow-700: #A87C00;

  /* 辅色：浅蓝系（科技清爽感） */
  --sock-blue-50:  #F0F7FF;
  --sock-blue-100: #E0F0FF;
  --sock-blue-200: #B8DCFF;
  --sock-blue-300: #7EC0FF;
  --sock-blue-400: #4AA3FF;
  --sock-blue-500: #2B87E6;
  --sock-blue-600: #1A6BC4;
  --sock-blue-700: #0E4F9E;

  /* 强调色：元气橙（袜子活力） */
  --sock-orange-300: #FFB07A;
  --sock-orange-400: #FF8C42;
  --sock-orange-500: #F5701A;

  /* 中性：纯白与深蓝灰 */
  --pure-white: #FFFFFF;
  --cloud:      #FAFBFF;
  --mist:       #F5F8FF;
  --fog:        #EDF2FA;
  --ink-900:    #1A2B4A;
  --ink-700:    #2D4A7A;
  --ink-500:    #4A6A9A;
  --ink-300:    #8AA0C0;
  --line:       #D8E2F0;
  --line-soft:  #EAF0F8;

  /* 功能 */
  --radius-sm: 10px;
  --radius:    18px;
  --radius-lg: 32px;
  --shadow-sm: 0 4px 18px rgba(43, 135, 230, 0.06);
  --shadow:    0 18px 48px rgba(43, 135, 230, 0.10);
  --shadow-lg: 0 32px 72px rgba(43, 135, 230, 0.16);
  --shadow-yellow: 0 12px 36px rgba(245, 184, 0, 0.18);
  --container: 1240px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 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: 16px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--cloud);
  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(--sock-blue-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: 800;
  line-height: 1.25;
  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, 1.55rem); }
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;
}
.container-narrow { max-width: 880px; }
.container-wide   { max-width: 1440px; }
section { position: relative; }

/* ==========================================================================
   纵向时间轴动态加粗线条布局系统（核心骨架）
   中央纵向粗线 + 节点 + 动态流光效果
   ========================================================================== */

/* 中央时间轴线 */
.timeline-axis {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 6px;
  transform: translateX(-50%);
  background: linear-gradient(180deg,
    var(--sock-yellow-300) 0%,
    var(--sock-blue-300) 50%,
    var(--sock-yellow-300) 100%);
  border-radius: 3px;
  z-index: 0;
  overflow: hidden;
}
.timeline-axis::before {
  content: "";
  position: absolute;
  top: -30%;
  left: 0;
  right: 0;
  height: 30%;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.8), transparent);
  animation: axisFlow 3s linear infinite;
}
@keyframes axisFlow {
  0% { top: -30%; }
  100% { top: 100%; }
}

/* 时间轴节点 */
.timeline-node {
  position: relative;
  z-index: 2;
}
.timeline-node::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 32px;
  width: 24px;
  height: 24px;
  transform: translateX(-50%);
  background: var(--pure-white);
  border: 5px solid var(--sock-yellow-400);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(255, 201, 40, 0.15);
  z-index: 3;
  transition: all .4s var(--ease-bounce);
}
.timeline-node:hover::before {
  border-color: var(--sock-blue-400);
  box-shadow: 0 0 0 10px rgba(74, 163, 255, 0.2);
  transform: translateX(-50%) scale(1.15);
}

/* 左侧时间轴内容 */
.timeline-left { padding-right: calc(50% + 40px); text-align: right; }
.timeline-right { padding-left: calc(50% + 40px); text-align: left; }

/* 动态加粗线条装饰条 */
.dynamic-bar {
  position: relative;
  height: 8px;
  background: var(--line-soft);
  border-radius: 4px;
  overflow: hidden;
}
.dynamic-bar::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--sock-yellow-400), var(--sock-blue-400));
  border-radius: 4px;
  animation: barGrow 1.5s var(--ease) forwards;
}
@keyframes barGrow {
  to { width: var(--bar-width, 70%); }
}

/* 元气波浪背景 */
.sock-wave-bg {
  position: relative;
  overflow: hidden;
}
.sock-wave-bg::before {
  content: "";
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255, 217, 90, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.sock-wave-bg::after {
  content: "";
  position: absolute;
  bottom: -80px; left: -80px;
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(126, 192, 255, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* 袜子条纹装饰 */
.sock-stripe {
  background: repeating-linear-gradient(
    45deg,
    var(--sock-yellow-100),
    var(--sock-yellow-100) 12px,
    var(--sock-blue-100) 12px,
    var(--sock-blue-100) 24px
  );
}

/* 柔光卡片 */
.glow-card {
  position: relative;
  background: var(--pure-white);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: all .4s var(--ease);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}
.glow-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--sock-yellow-400), var(--sock-blue-400), var(--sock-orange-400));
}
.glow-card::after {
  content: "";
  position: absolute;
  top: -50%; right: -30%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(255, 217, 90, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.glow-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--sock-yellow-200);
}

/* 元气拼布网格 */
.patch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.patch-cell {
  background: var(--pure-white);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
  transition: transform .4s var(--ease-bounce), box-shadow .4s var(--ease), border-color .4s var(--ease);
  overflow: hidden;
}
.patch-cell::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--sock-yellow-100), transparent);
  opacity: 0;
  transition: opacity .4s var(--ease);
}
.patch-cell:nth-child(8n+1) { background: var(--sock-yellow-50); border-color: var(--sock-yellow-200); }
.patch-cell:nth-child(8n+3) { background: var(--sock-blue-50); border-color: var(--sock-blue-200); }
.patch-cell:nth-child(8n+5) { background: var(--sock-yellow-100); border-color: var(--sock-yellow-300); }
.patch-cell:nth-child(8n+7) { background: var(--sock-blue-100); border-color: var(--sock-blue-300); }
.patch-cell:hover {
  transform: translateY(-6px) rotate(-0.5deg);
  box-shadow: var(--shadow);
  border-color: var(--sock-blue-400);
}
.patch-cell:hover::before { opacity: 1; }

/* 斜角面板 */
.bevel-panel {
  background: var(--pure-white);
  border-radius: var(--radius-lg);
  padding: 48px;
  position: relative;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line-soft);
}
.bevel-panel::before {
  content: "";
  position: absolute;
  top: -1px; left: 40px;
  width: 120px; height: 6px;
  background: linear-gradient(90deg, var(--sock-yellow-400), var(--sock-blue-500));
  border-radius: 0 0 4px 4px;
}

/* ==========================================================================
   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(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  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(255, 255, 255, 0.97);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-weight: 800; font-size: 1.25rem; color: var(--ink-900);
  letter-spacing: 0.02em;
}
.brand img { width: 42px; height: 42px; border-radius: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(135deg, var(--sock-yellow-400), var(--sock-blue-400));
  display: grid; place-items: center; color: var(--pure-white);
  font-size: 1.15rem; font-weight: 900;
  box-shadow: 0 4px 14px rgba(43, 135, 230, 0.25);
}
.brand-text small { display: block; font-size: 0.65rem; font-weight: 500; 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: 10px 14px;
  font-size: 0.93rem;
  color: var(--ink-700);
  border-radius: 10px;
  transition: all .3s var(--ease);
  font-weight: 500;
}
.main-nav > li > a:hover,
.main-nav > li.active > a {
  color: var(--sock-blue-500);
  background: var(--sock-blue-50);
}
/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px); left: 0;
  min-width: 220px;
  background: var(--pure-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 10px;
  opacity: 0; visibility: hidden;
  transform: translateY(8px);
  transition: all .3s var(--ease);
}
.dropdown-menu::before {
  content: "";
  position: absolute;
  top: -6px; left: 24px;
  width: 12px; height: 12px;
  background: var(--pure-white);
  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: 10px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--ink-700);
}
.dropdown-menu li a:hover { background: var(--sock-yellow-50); color: var(--sock-blue-500); }

.nav-cta {
  margin-left: 10px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--sock-yellow-400), var(--sock-orange-400));
  color: var(--pure-white);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all .3s var(--ease);
  box-shadow: 0 4px 16px rgba(255, 140, 66, 0.3);
}
.nav-cta:hover { background: linear-gradient(135deg, var(--sock-yellow-500), var(--sock-orange-500)); color: var(--pure-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255, 140, 66, 0.38); }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--sock-yellow-100);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2.5px;
  background: var(--ink-700);
  border-radius: 2px;
  transition: all .3s var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* 移动抽屉 */
.mobile-drawer {
  position: fixed;
  top: 78px; right: 0;
  width: 82%; max-width: 340px;
  height: calc(100vh - 78px);
  background: var(--pure-white);
  border-left: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  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 solid var(--line-soft);
  color: var(--ink-700);
  font-weight: 600;
  border-radius: 8px;
}
.mobile-drawer li a:hover { color: var(--sock-blue-500); background: var(--sock-blue-50); }
.mobile-sub { padding-left: 20px; }
.overlay {
  position: fixed; inset: 0;
  background: rgba(26, 43, 74, 0.38);
  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: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all .35s var(--ease);
  border: 2px solid transparent;
  cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--sock-yellow-400), var(--sock-orange-400)); color: var(--pure-white); box-shadow: 0 4px 16px rgba(255, 140, 66, 0.28); }
.btn-primary:hover { background: linear-gradient(135deg, var(--sock-yellow-500), var(--sock-orange-500)); color: var(--pure-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255, 140, 66, 0.36); }
.btn-blue { background: linear-gradient(135deg, var(--sock-blue-400), var(--sock-blue-500)); color: var(--pure-white); box-shadow: 0 4px 16px rgba(43, 135, 230, 0.28); }
.btn-blue:hover { background: linear-gradient(135deg, var(--sock-blue-500), var(--sock-blue-600)); color: var(--pure-white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(43, 135, 230, 0.36); }
.btn-outline { border-color: var(--sock-blue-300); color: var(--sock-blue-500); background: var(--pure-white); }
.btn-outline:hover { background: var(--sock-blue-50); color: var(--sock-blue-600); transform: translateY(-2px); border-color: var(--sock-blue-400); }
.btn-ghost { color: var(--ink-700); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--sock-blue-300); color: var(--sock-blue-500); }
.btn-warm { background: var(--sock-yellow-300); color: var(--ink-900); }
.btn-warm:hover { background: var(--sock-yellow-200); color: var(--ink-900); transform: translateY(-2px); box-shadow: var(--shadow-yellow); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }

.txt-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--sock-blue-500); font-weight: 700; 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(--sock-blue-400); }
.txt-link:hover::after { transform: translateX(4px); }

/* ==========================================================================
   板块标题
   ========================================================================== */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-yellow { background: var(--sock-yellow-50); }
.section-blue { background: var(--sock-blue-50); }
.section-cloud { background: var(--cloud); }
.section-white { background: var(--pure-white); }
.section-mist { background: var(--mist); }
.section-dark  { background: var(--ink-900); color: #C8D8F0; }
.section-dark h2, .section-dark h3 { color: var(--pure-white); }

.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: 8px;
  padding: 6px 18px;
  background: var(--sock-yellow-100);
  color: var(--sock-yellow-700);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.eyebrow.blue { background: var(--sock-blue-100); color: var(--sock-blue-600); }
.eyebrow.dark { background: rgba(255,255,255,0.1); color: var(--sock-yellow-300); }
.section-head p { font-size: 1.05rem; color: var(--ink-500); margin-top: 14px; }
.section-head.center p { margin-left: auto; margin-right: auto; }

/* 3D立方体装饰标记 */
.cube-mark {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--sock-yellow-400), var(--sock-blue-400));
  border-radius: 8px;
  color: var(--pure-white);
  font-weight: 900;
  margin-right: 10px;
  vertical-align: middle;
}
.cube-mark svg { width: 18px; height: 18px; }

/* ==========================================================================
   卡片
   ========================================================================== */
.card {
  background: var(--pure-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  transition: all .4s var(--ease);
  height: 100%;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--sock-yellow-200); }
.card-img { border-radius: var(--radius); overflow: hidden; margin-bottom: 22px; position: relative; }
.card-img img { width: 100%; height: 240px; object-fit: cover; transition: transform .6s var(--ease); }
.card:hover .card-img img { transform: scale(1.05); }
.card h3 { margin-bottom: 12px; }
.card p { font-size: 0.95rem; }

/* 缝线卡片（袜子元素） */
.stitch-card {
  background: var(--pure-white);
  border-radius: var(--radius);
  padding: 36px 32px;
  border: 2px dashed var(--sock-yellow-300);
  position: relative;
  transition: all .4s var(--ease);
}
.stitch-card::before {
  content: "";
  position: absolute; inset: 8px;
  border: 1px solid var(--line-soft);
  border-radius: calc(var(--radius) - 6px);
  pointer-events: none;
}
.stitch-card:hover { background: var(--sock-yellow-50); transform: translateY(-4px); border-color: var(--sock-blue-300); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: linear-gradient(135deg, var(--ink-900) 0%, #1E3A5F 60%, var(--sock-blue-700) 100%);
  color: #A8B8D0;
  padding: 80px 0 0;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 24px;
  background: linear-gradient(135deg, var(--ink-900) 50%, transparent 50%);
  background-size: 48px 24px;
  background-repeat: repeat-x;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 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(--pure-white); font-size: 1rem; margin-bottom: 22px; letter-spacing: 0.04em; }
.footer-col p { color: #8898B0; font-size: 0.92rem; line-height: 1.85; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: #A8B8D0; font-size: 0.92rem; transition: all .3s var(--ease); }
.footer-col ul li a:hover { color: var(--sock-yellow-300); padding-left: 6px; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 14px; font-size: 0.92rem; color: #A8B8D0; }
.footer-contact .ic { color: var(--sock-yellow-300); 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: #6C7C98;
}
.footer-bottom a { color: #6C7C98; }
.footer-bottom a:hover { color: var(--sock-yellow-300); }
.footer-icp a { color: #8898B0; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  display: grid; place-items: center;
  color: #A8B8D0;
  transition: all .3s var(--ease);
}
.footer-social a:hover { background: var(--sock-yellow-400); color: var(--ink-900); border-color: var(--sock-yellow-400); }

/* ==========================================================================
   页面通用：面包屑、页头横幅
   ========================================================================== */
.page-hero {
  padding: 150px 0 70px;
  background:
    radial-gradient(circle at 18% 22%, rgba(255, 217, 90, 0.12) 0%, transparent 48%),
    radial-gradient(circle at 82% 78%, rgba(126, 192, 255, 0.12) 0%, transparent 50%),
    linear-gradient(135deg, var(--pure-white) 0%, var(--cloud) 100%);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -1px;
  width: 120px; height: 6px;
  background: linear-gradient(90deg, var(--sock-yellow-400), var(--sock-blue-500));
  transform: translateX(-50%);
  border-radius: 4px;
}
.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  font-size: 0.86rem; color: var(--ink-300);
  margin-bottom: 18px;
}
.breadcrumb a:hover { color: var(--sock-blue-500); }
.breadcrumb span.sep { color: var(--ink-300); }
.page-hero h1 { margin-bottom: 16px; }
.page-hero p { font-size: 1.08rem; max-width: 680px; }

/* ==========================================================================
   表单
   ========================================================================== */
.form-row { margin-bottom: 20px; }
.form-label { display: block; font-size: 0.9rem; color: var(--ink-700); margin-bottom: 8px; font-weight: 600; }
.form-label .req { color: var(--sock-orange-400); }
.form-control {
  width: 100%;
  padding: 14px 18px;
  background: var(--pure-white);
  border: 2px solid var(--line);
  border-radius: 12px;
  font-size: 0.96rem;
  transition: all .3s var(--ease);
}
.form-control:focus {
  outline: none;
  border-color: var(--sock-blue-300);
  box-shadow: 0 0 0 4px var(--sock-blue-100);
}
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 14px;
  background: var(--sock-yellow-100); color: var(--sock-yellow-700);
  border-radius: 999px; font-size: 0.78rem; font-weight: 600;
}
.tag.blue { background: var(--sock-blue-100); color: var(--sock-blue-600); }

/* ==========================================================================
   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; }

/* 装饰：网格背景 */
.bg-grid {
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* 装饰：元气拼色色块背景 */
.sock-patch-bg {
  background:
    linear-gradient(135deg, var(--sock-yellow-50) 0%, var(--sock-yellow-50) 25%, var(--pure-white) 25%, var(--pure-white) 50%, var(--sock-blue-50) 50%, var(--sock-blue-50) 75%, var(--sock-yellow-100) 75%);
  background-size: 60px 60px;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sock-yellow-400), var(--sock-blue-400));
  color: var(--pure-white);
  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 { transform: translateY(-4px); box-shadow: var(--shadow-lg); }