/* ═══════════════════════════════════════════════════════════════
   VEPAGOO 品牌站点样式表
   ─ 配色取自品牌 Logo 与亚马逊旗舰店视觉：
     品牌红 #C00000（Logo 红杠/店铺横幅采样）+ 炭黑 #141414
   ─ 字体：Oswald（标题，硬朗机械感）+ Inter（正文）
   ═══════════════════════════════════════════════════════════════ */

/* ---------- 全局变量：改配色只需要动这里 ---------- */
:root {
  --red: #c00000;          /* 品牌红（Logo 红杠采样） */
  --red-bright: #d92b2b;   /* 红色 hover 提亮 */
  --red-deep: #8f0000;     /* 红色按下/深色点缀 */
  --ink: #141414;          /* 炭黑：标题/页眉背景（Logo 黑字采样） */
  --charcoal: #1b1c1e;     /* 深色区块背景 */
  --coal-deep: #0f0f10;    /* 最深：页脚背景 */
  --body: #2b2b2e;         /* 正文主色 */
  --slate: #6b6f76;        /* 次要文字 */
  --line: #e8e6e2;         /* 分隔线/描边（暖灰） */
  --bg-alt: #f6f4f0;       /* 暖沙色区块背景 */
  --white: #ffffff;
  --radius: 14px;          /* 卡片统一圆角 */
  --shadow: 0 10px 30px rgba(20, 20, 20, 0.09);      /* 常规卡片阴影 */
  --shadow-lg: 0 22px 50px rgba(20, 20, 20, 0.16);   /* hover 抬升阴影 */
  --font-head: "Oswald", "Arial Narrow", sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--body);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* 页面统一内容宽度 */
.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- 通用排版 ---------- */
/* 小眉题：区块顶部的红色大写引导文字 */
.eyebrow {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 0.6rem;
}
.eyebrow.on-dark { color: #ff6b6b; }
.section-title {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(2rem, 4.2vw, 2.9rem);
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin-bottom: 1rem;
}
.section-title.on-dark { color: var(--white); }
.section-sub { color: var(--slate); max-width: 640px; margin: 0 auto 3rem; font-size: 1.05rem; }
.section-sub.on-dark { color: #b9bcc2; }
.center { text-align: center; }
.center.section-sub { margin-left: auto; margin-right: auto; }
.text-red { color: var(--red-bright); }

/* 区块通用垂直间距 */
.section { padding: 5.5rem 0; }
.section-alt { background: var(--bg-alt); }
/* 炭黑区块（核心技术/联系我们），右上一抹品牌红氛围光 */
.section-dark {
  background:
    radial-gradient(900px 420px at 88% 0%, rgba(192, 0, 0, 0.22), transparent 62%),
    linear-gradient(165deg, #202124 0%, var(--charcoal) 55%, #151517 100%);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.72rem 1.5rem;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn .icon { width: 1.05em; height: 1.05em; }
.btn:hover { transform: translateY(-2px); }
/* 品牌红主按钮：全站最高优先级 CTA（亚马逊方向） */
.btn-red { background: var(--red); color: var(--white); box-shadow: 0 6px 18px rgba(192, 0, 0, 0.35); }
.btn-red:hover { background: var(--red-bright); box-shadow: 0 10px 24px rgba(192, 0, 0, 0.45); }
/* 炭黑实心按钮 */
.btn-dark { background: var(--ink); color: var(--white); box-shadow: var(--shadow); }
.btn-dark:hover { background: #000; }
/* 浅色描边按钮：用在深色背景上 */
.btn-outline-light { border-color: rgba(255, 255, 255, 0.65); color: var(--white); }
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.12); border-color: var(--white); }
.btn-lg { padding: 0.95rem 2.1rem; font-size: 1.06rem; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 1.1rem 0;
  transition: background 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
}
/* 滚动后加 .scrolled：变为实色炭黑并缩小高度（js/main.js 控制） */
.site-header.scrolled {
  background: rgba(15, 15, 16, 0.96);
  backdrop-filter: blur(8px);
  padding: 0.6rem 0;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}
.header-inner { display: flex; align-items: center; gap: 2rem; }

/* Logo：官方白字词标位图（381×74 紧凑裁剪透明 PNG，等比缩放） */
.brand { display: inline-flex; align-items: center; }
.brand-mark { height: 30px; width: auto; flex-shrink: 0; }

/* 桌面导航链接 */
.main-nav { display: flex; gap: 1.9rem; margin-left: auto; }
.main-nav a {
  font-weight: 500;
  font-size: 0.96rem;
  color: rgba(255, 255, 255, 0.88);
  position: relative;
  padding: 0.3rem 0;
}
/* hover 下划线动效 */
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 0;
  height: 2px;
  background: var(--red-bright);
  transition: right 0.25s ease;
}
.main-nav a:hover { color: var(--white); }
.main-nav a:hover::after { right: 0; }
.nav-cta-mobile { display: none; } /* 仅移动端菜单里显示 */

/* 移动端汉堡按钮（桌面隐藏） */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span { width: 24px; height: 2.5px; background: var(--white); border-radius: 2px; transition: 0.25s; }
/* 打开状态：三横变叉 */
.menu-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Hero 首屏 ---------- */
/* 背景源图为旗舰店超宽横幅（1920×536），因此 Hero 采用适中高度而非满屏，
   避免过度放大导致画质变软 */
.hero {
  position: relative;
  min-height: clamp(560px, 76vh, 700px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  color: var(--white);
  background: var(--charcoal);
}
/* 背景图铺满 */
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% center; /* 让右侧皮卡与山湖场景更多露出 */
}
/* 炭黑渐变遮罩：保证左侧标题可读性 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(97deg, rgba(10, 10, 11, 0.93) 10%, rgba(15, 15, 17, 0.72) 42%, rgba(18, 18, 20, 0.24) 74%, rgba(18, 18, 20, 0.10) 100%);
  z-index: 1;
}
.hero-content { position: relative; z-index: 2; padding: 8rem 0 9.5rem; }
.hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.7rem, 6.5vw, 4.6rem);
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0.4rem 0 1.3rem;
}
.hero-sub { max-width: 580px; font-size: 1.1rem; color: #e2e2e4; margin-bottom: 2.2rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* 首屏底部信任数据条：半透明炭黑玻璃质感 + 红色顶边 */
.trust-strip {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  background: rgba(12, 12, 13, 0.8);
  backdrop-filter: blur(6px);
  border-top: 2px solid rgba(192, 0, 0, 0.75);
}
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { text-align: center; padding: 1.25rem 0.5rem; }
.trust-item strong {
  display: block;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.85rem;
  color: #ff5a5a;
  line-height: 1.1;
}
.trust-item span { font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; color: #b9bcc2; }
/* 相邻数据之间的细分隔线 */
.trust-item + .trust-item { border-left: 1px solid rgba(255, 255, 255, 0.12); }

/* ---------- 产品分类卡片 ---------- */
.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.8rem; }
.category-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
  display: flex;
  flex-direction: column;
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.category-media { aspect-ratio: 16 / 8; overflow: hidden; }
.category-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.category-card:hover .category-media img { transform: scale(1.05); }
.category-body { padding: 1.5rem 1.7rem 1.7rem; }
.category-body h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.45rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-bottom: 0.45rem;
}
.category-body p { color: var(--slate); font-size: 0.97rem; margin-bottom: 0.9rem; }
/* 卡片底部的"伪链接"文字，箭头 hover 前移 */
.card-link { font-weight: 600; color: var(--red); font-size: 0.95rem; }
.card-link::after { content: " →"; transition: margin-left 0.2s ease; }
.category-card:hover .card-link::after,
.contact-card:hover .card-link::after { margin-left: 6px; }

/* ---------- 精选产品卡片（由 JS 渲染进 #product-grid） ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.4rem;
  margin-bottom: 1.2rem;
}
.product-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.2rem 1.4rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
.product-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
/* 产品图：白底图统一等高展示 */
.product-media { height: 200px; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; }
.product-media img { max-height: 100%; object-fit: contain; }
/* 品类小标签 */
.product-tag {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red-deep);
  background: #f9e9e9;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.55rem;
}
.product-card h3 { font-size: 0.99rem; font-weight: 600; line-height: 1.35; color: var(--body); margin-bottom: 0.5rem; }
/* 星级评分行 */
.product-rating { display: flex; align-items: center; gap: 0.4rem; font-size: 0.88rem; color: var(--slate); margin-bottom: 0.7rem; }
.stars { position: relative; display: inline-block; font-size: 0.95rem; line-height: 1; color: #e0ddd8; letter-spacing: 2px; }
/* 用两层星星重叠 + 宽度百分比实现半星效果 */
.stars::before { content: "★★★★★"; }
.stars i {
  position: absolute;
  left: 0; top: 0;
  overflow: hidden;
  white-space: nowrap;
  color: #f5a623;
  font-style: normal;
}
.stars i::before { content: "★★★★★"; }
.product-bottom { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
.product-price { font-family: var(--font-head); font-weight: 600; font-size: 1.4rem; color: var(--ink); }
/* 小号"去亚马逊"按钮 */
.btn-amazon {
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  padding: 0.5rem 0.9rem;
  background: var(--ink);
  color: var(--white);
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: background 0.2s ease;
}
.btn-amazon:hover { background: var(--red); }
.btn-amazon svg { width: 0.9em; height: 0.9em; }
/* 价格波动免责说明 */
.price-note { text-align: center; font-size: 0.82rem; color: #a3a7ad; margin-bottom: 2rem; }

/* ---------- 选型工具（Find Your Perfect Fit） ---------- */
/* 区块背景：暖沙底 + 品牌红氛围光斑 */
.fit-finder { background:
  radial-gradient(680px 340px at 12% 8%, rgba(192, 0, 0, 0.08), transparent 65%),
  radial-gradient(680px 340px at 88% 92%, rgba(20, 20, 20, 0.07), transparent 65%),
  var(--bg-alt);
}
.finder-card {
  max-width: 780px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2.2rem 2.4rem 1.8rem;
}
/* 模式切换标签 */
.finder-tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-alt);
  padding: 0.35rem;
  border-radius: 10px;
  margin-bottom: 1.8rem;
}
.finder-tab {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.65rem 0.8rem;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--slate);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.finder-tab .icon { width: 1.2em; height: 1.2em; }
.finder-tab.active { background: var(--ink); color: var(--white); box-shadow: 0 4px 12px rgba(20, 20, 20, 0.3); }
/* 表单面板：非激活的隐藏 */
.finder-panel { display: none; }
.finder-panel.active { display: block; animation: fadeUp 0.35s ease; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.finder-fields { display: grid; gap: 1.1rem; margin-bottom: 1.4rem; }
.finder-fields.three { grid-template-columns: repeat(3, 1fr); }
.finder-fields.two { grid-template-columns: repeat(2, 1fr); }
.finder-fields label span {
  display: block;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.4rem;
}
.finder-fields label em { color: var(--red); font-style: normal; } /* 必填星号 */
.finder-fields input,
.finder-fields select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--body);
  background: var(--bg-alt);
  border: 1.5px solid var(--line);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}
.finder-fields select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--slate) 50%), linear-gradient(135deg, var(--slate) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; cursor: pointer; }
.finder-fields input:focus,
.finder-fields select:focus {
  outline: none;
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(192, 0, 0, 0.14);
  background-color: var(--white);
}
/* 带单位后缀（in / lbs）的输入框 */
.unit-wrap { position: relative; }
.unit-wrap i {
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  font-style: normal;
  font-size: 0.85rem;
  color: #a3a7ad;
  pointer-events: none;
}
.finder-note { margin-top: 1.2rem; font-size: 0.85rem; color: #a3a7ad; text-align: center; }
.finder-note a { color: var(--red); font-weight: 600; }
.finder-note a:hover { text-decoration: underline; }

/* ---------- 核心技术卡片 ---------- */
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.4rem; margin-top: 3rem; }
.tech-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  transition: background 0.25s ease, transform 0.25s ease;
}
.tech-card:hover { background: rgba(255, 255, 255, 0.1); transform: translateY(-4px); }
.tech-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(192, 0, 0, 0.22);
  color: #ff6b6b;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.1rem;
}
.tech-icon svg { width: 28px; height: 28px; }
.tech-card h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.22rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 0.5rem;
}
.tech-card p { color: #b9bcc2; font-size: 0.94rem; }

/* ---------- 品牌故事 ---------- */
.story-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3.5rem;
  align-items: center;
  margin-bottom: 3.5rem;
}
.story-media { position: relative; }
.story-media img { border-radius: var(--radius); box-shadow: var(--shadow-lg); }
/* 悬浮在图片左下角的"10+ Years"角标 */
.story-badge {
  position: absolute;
  left: -1.2rem;
  bottom: 1.6rem;
  background: var(--ink);
  color: var(--white);
  border-radius: 12px;
  padding: 1rem 1.4rem;
  box-shadow: var(--shadow-lg);
  max-width: 250px;
  border-left: 4px solid var(--red);
}
.story-badge strong {
  display: block;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.55rem;
  text-transform: uppercase;
  color: #ff5a5a;
  line-height: 1.15;
}
.story-badge span { font-size: 0.85rem; color: #c9ccd2; }
.story-body p { color: var(--slate); margin-bottom: 1.1rem; }
/* 使命列表：红色对勾 */
.mission-list { list-style: none; margin-top: 1.4rem; }
.mission-list li {
  position: relative;
  padding-left: 1.9rem;
  margin-bottom: 0.75rem;
  color: var(--slate);
}
.mission-list li::before {
  content: "✔";
  position: absolute;
  left: 0;
  top: 0.05rem;
  color: var(--red);
  font-weight: 700;
}
.mission-list strong { color: var(--ink); }
/* 官方支持横幅 */
.collage img { border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.6rem; max-width: 980px; margin: 0 auto; }
.contact-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 2rem 1.8rem;
  text-align: center;
  transition: background 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}
.contact-card:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-5px); border-color: rgba(217, 43, 43, 0.6); }
.contact-icon {
  width: 58px;
  height: 58px;
  margin: 0 auto 1.1rem;
  border-radius: 50%;
  background: rgba(192, 0, 0, 0.22);
  color: #ff6b6b;
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-icon svg { width: 28px; height: 28px; }
.contact-card h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 0.3rem;
}
.contact-card p { color: #b9bcc2; font-size: 0.97rem; margin-bottom: 0.8rem; word-break: break-all; }
.contact-card .card-link { color: #ff6b6b; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--coal-deep); color: #9a9ea6; padding: 4rem 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand .brand { margin-bottom: 1rem; }
.footer-brand .brand-mark { height: 26px; }
.footer-brand p { font-size: 0.95rem; max-width: 300px; }
.footer-col h4 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 1rem;
}
.footer-col a { display: block; font-size: 0.93rem; padding: 0.28rem 0; transition: color 0.2s ease; }
.footer-col a:hover { color: #ff6b6b; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.4rem 0;
  font-size: 0.82rem;
  color: #6d7178;
}

/* ---------- 入场动画：JS 给 .reveal 加 .visible 触发 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }
/* 用户系统设置了"减少动态效果"时直接显示 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ═══════════════ 响应式断点 ═══════════════ */
/* 平板：≤1024px */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* 手机 / 小平板：≤820px */
@media (max-width: 820px) {
  .section { padding: 3.8rem 0; }

  /* 导航折叠为全屏下拉菜单 */
  .menu-toggle { display: flex; }
  .header-cta { display: none; }
  .main-nav {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: min(320px, 82vw);
    background: var(--coal-deep);
    flex-direction: column;
    gap: 0;
    padding: 5.5rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -14px 0 40px rgba(0, 0, 0, 0.35);
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav a { padding: 0.9rem 0; font-size: 1.1rem; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
  .nav-cta-mobile { display: block; color: #ff6b6b !important; font-weight: 600; }

  .brand-mark { height: 24px; }
  .hero { min-height: clamp(520px, 82vh, 660px); }
  .hero-content { padding: 7rem 0 3.5rem; }
  /* 移动端信任条改为文档流内实色区块，避免与按钮重叠 */
  .trust-strip { position: static; background: #131315; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  /* 四宫格数据在手机上分两行，去掉跨行分隔线 */
  .trust-item:nth-child(3) { border-left: 0; }
  .trust-item { padding: 0.9rem 0.4rem; }
  .trust-item strong { font-size: 1.5rem; }

  .category-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .finder-card { padding: 1.6rem 1.3rem 1.4rem; }
  .finder-fields.three, .finder-fields.two { grid-template-columns: 1fr; }
  .finder-tabs { flex-direction: column; }
  .finder-tab { font-size: 0.95rem; padding: 0.6rem 0.5rem; }
  .story-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .story-badge { left: 1rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
}

/* 窄屏手机：≤480px 产品卡改单列 */
@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}