/* =========================================================================
   湖州高峰科技有限公司 · 官网样式表
   纯 CSS，无任何构建依赖，双击 index.html 即可预览
   -------------------------------------------------------------------------
   配色规范（改这里即可全站换色，变量名为唯一色值来源）：
   --brand        主色（商务深蓝）
   --brand-dark   主色加深，用于 hover / 页脚
   --accent       强调色（CTA 按钮、高亮）
   -------------------------------------------------------------------------
   响应式断点：
   断点一 768px  —— 平板 / 桌面布局切换（导航展开、栅格多列）
   断点二 480px  —— 小屏手机微调字号与间距
   ========================================================================= */

/* ============ 1. 设计变量 ============ */
:root {
  /* 主色系 */
  --brand: #1b4a8a;
  --brand-dark: #12325f;
  --brand-light: #eaf1fa;
  --brand-mid: #2d6bb8;

  /* 强调色 */
  --accent: #e8871e;
  --accent-dark: #cf7312;

  /* 中性色 */
  --ink: #1a2434;
  --text: #3f4a5a;
  --muted: #7b8798;
  --line: #e3e8ef;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;

  /* 尺寸 */
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(20, 40, 80, .06);
  --shadow: 0 8px 24px rgba(20, 40, 80, .09);
  --shadow-lg: 0 18px 48px rgba(20, 40, 80, .14);
  --container: 1200px;
  --header-h: 72px;

  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ============ 2. 基础重置 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden; /* 防止移动端横向滚动 */
}

img { max-width: 100%; display: block; border: 0; }
a { color: inherit; text-decoration: none; transition: color .25s var(--ease); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea { font: inherit; color: inherit; }

h1, h2, h3, h4 { color: var(--ink); line-height: 1.35; font-weight: 700; }
h1 { font-size: clamp(26px, 4.2vw, 46px); }
h2 { font-size: clamp(22px, 3vw, 34px); }
h3 { font-size: clamp(17px, 2vw, 20px); }

/* 无障碍：键盘可聚焦 */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 3px solid rgba(45, 107, 184, .45);
  outline-offset: 2px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--brand); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ============ 3. 通用布局 ============ */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

.section { padding: 76px 0; }
.section-services { background: var(--bg-soft); }
.section-flow { background: var(--bg-soft); }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 44px; }
.section-tag {
  font-size: 13px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  color: var(--brand-mid); margin-bottom: 10px;
}
.section-head h2 { margin-bottom: 14px; }
.section-sub { color: var(--muted); font-size: 15.5px; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

/* ============ 4. 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 11px 26px; border-radius: 8px;
  font-weight: 600; font-size: 15.5px; white-space: nowrap;
  transition: transform .22s var(--ease), background .22s var(--ease), box-shadow .22s var(--ease), color .22s var(--ease);
}
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 4px 14px rgba(27, 74, 138, .28); }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-2px); box-shadow: 0 8px 22px rgba(27, 74, 138, .34); }

.btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(232, 135, 30, .3); }
.btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 22px rgba(232, 135, 30, .36); }

.btn-ghost { background: rgba(255, 255, 255, .12); color: #fff; border: 1.5px solid rgba(255, 255, 255, .65); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: #fff; color: var(--brand); border-color: #fff; transform: translateY(-2px); }

.btn-sm { min-height: 40px; padding: 8px 18px; font-size: 14.5px; }
.btn-block { width: 100%; }

/* ============ 5. 页头与导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line); backdrop-filter: blur(10px);
  transition: box-shadow .3s var(--ease);
}
.site-header.is-scrolled { box-shadow: 0 6px 20px rgba(20, 40, 80, .09); }

.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}

/* Logo（企业商标图形标 assets/img/logo-mark.png） */
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-mark-img {
  width: 42px; height: 42px; border-radius: 9px; flex-shrink: 0;
  object-fit: contain; background: #fff;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 17px; color: var(--ink); letter-spacing: .5px; }
.logo-text small { font-size: 10px; letter-spacing: .18em; color: var(--muted); }

.nav-desktop { display: none; align-items: center; gap: 30px; }
.nav-desktop a { font-size: 15.5px; color: var(--text); position: relative; padding: 6px 0; }
.nav-desktop a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--brand); transition: width .28s var(--ease);
}
.nav-desktop a:hover, .nav-desktop a.active { color: var(--brand); }
.nav-desktop a:hover::after, .nav-desktop a.active::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 10px; }
.header-tel { display: none; }

/* 汉堡按钮 */
.menu-btn { width: 44px; height: 44px; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; border-radius: 8px; }
.menu-btn span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease), opacity .25s var(--ease); }
.menu-btn.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.is-open span:nth-child(2) { opacity: 0; }
.menu-btn.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端菜单 */
.nav-mobile {
  display: none; flex-direction: column; gap: 4px;
  padding: 12px 20px 22px; border-top: 1px solid var(--line); background: #fff;
}
.nav-mobile.is-open { display: flex; }
.nav-mobile a { padding: 14px 4px; font-size: 16px; border-bottom: 1px solid var(--line); color: var(--ink); }
.nav-mobile a:last-child { border-bottom: 0; margin-top: 10px; color: #fff; }

/* ============ 6. 首页轮播 Banner ============ */
.hero { position: relative; }
.slides { position: relative; height: 460px; overflow: hidden; background: var(--brand-dark); }

.slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .8s var(--ease), visibility .8s var(--ease); }
.slide.is-active { opacity: 1; visibility: visible; z-index: 2; }

/* 背景层：当前为 CSS 渐变占位；正式上线请替换为 <img src="assets/img/banner-x.jpg" alt="..."> */
.slide-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.slide-bg-1 { background: linear-gradient(120deg, #0e2b52 0%, #1b4a8a 45%, #2d6bb8 100%); }
.slide-bg-2 { background: linear-gradient(120deg, #12325f 0%, #24549b 50%, #3f7fc4 100%); }
.slide-bg-3 { background: linear-gradient(120deg, #10304f 0%, #1c5b7a 50%, #2a8fa8 100%); }
/* 装饰光斑，让纯渐变背景不显单调 */
.slide-bg::before,
.slide-bg::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(2px);
}
.slide-bg::before {
  width: 460px; height: 460px; right: -110px; top: -150px;
  background: radial-gradient(circle, rgba(255,255,255,.16) 0%, rgba(255,255,255,0) 68%);
}
.slide-bg::after {
  width: 620px; height: 620px; left: -160px; bottom: -300px;
  background: radial-gradient(circle, rgba(232,135,30,.20) 0%, rgba(232,135,30,0) 66%);
}

.slide-mask {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(8, 22, 42, .82) 0%, rgba(8, 22, 42, .62) 52%, rgba(8, 22, 42, .28) 100%);
}

.slide-content {
  position: relative; z-index: 3; height: 100%;
  max-width: var(--container); margin: 0 auto; padding: 0 20px;
  display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  color: #fff;
}
.slide-tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .12em;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .3);
  color: #fff;
}
.slide-content h1, .slide-content h2 {
  color: #fff; max-width: 780px; text-shadow: 0 2px 14px rgba(0, 0, 0, .28);
}
.slide-desc {
  margin-top: 16px; max-width: 640px; font-size: 16px; line-height: 1.8;
  color: rgba(255, 255, 255, .9);
}
.slide-btns { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

/* 轮播切换箭头 */
.hero-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 6;
  width: 46px; height: 46px; border-radius: 50%;
  background: rgba(255, 255, 255, .18); color: #fff; font-size: 17px;
  border: 1px solid rgba(255, 255, 255, .38); backdrop-filter: blur(6px);
  display: grid; place-items: center;
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.hero-arrow:hover { background: rgba(255, 255, 255, .92); color: var(--brand); }
.hero-prev { left: 14px; }
.hero-next { right: 14px; }
.hero-prev:hover { transform: translateY(-50%) translateX(-2px); }
.hero-next:hover { transform: translateY(-50%) translateX(2px); }

/* 指示点 */
.hero-dots {
  position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%);
  z-index: 6; display: flex; gap: 10px;
}
.hero-dots .dot {
  width: 10px; height: 10px; border-radius: 999px;
  background: rgba(255, 255, 255, .45);
  transition: width .3s var(--ease), background .3s var(--ease);
}
.hero-dots .dot:hover { background: rgba(255, 255, 255, .8); }
.hero-dots .dot.is-active { width: 30px; background: var(--accent); }

/* 自动播放进度条 */
.hero-progress { position: absolute; left: 0; bottom: 0; width: 100%; height: 3px; background: rgba(255, 255, 255, .16); z-index: 6; }
.hero-progress span { display: block; height: 100%; width: 0; background: var(--accent); }

/* ============ 7. 核心业务卡片 ============ */
.svc-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 26px; box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.svc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(45, 107, 184, .35); }
.svc-ico {
  width: 56px; height: 56px; border-radius: 14px; margin-bottom: 18px;
  display: grid; place-items: center; font-size: 26px;
  background: var(--brand-light); color: var(--brand);
}
.svc-card h3 { margin-bottom: 10px; }
.svc-card p { font-size: 15px; color: var(--muted); }

/* ============ 8. 产品展示区 ============ */
.filter-bar { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 36px; }
.filter-btn {
  min-height: 42px; padding: 8px 20px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; color: var(--text); font-size: 15px;
  transition: all .25s var(--ease);
}
.filter-btn:hover { border-color: var(--brand-mid); color: var(--brand); }
.filter-btn.is-active { background: var(--brand); border-color: var(--brand); color: #fff; box-shadow: 0 4px 14px rgba(27, 74, 138, .25); }

.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; display: flex; flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), opacity .3s var(--ease);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-card.is-hidden { display: none; }

.product-media { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: var(--brand-light); }
.product-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.product-card:hover .product-media img { transform: scale(1.06); }

/* 产品图：真实图片位于 assets/img/product-1.jpg ~ product-10.jpg（1200×900）
   新增产品卡时在 .product-media 内放 <img src="assets/img/product-N.jpg" alt="..." loading="lazy"> 即可 */

.product-body { padding: 22px 22px 26px; display: flex; flex-direction: column; flex: 1; }
.product-badge {
  align-self: flex-start; font-size: 12px; font-weight: 700; letter-spacing: .06em;
  color: var(--brand); background: var(--brand-light);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 12px;
}
.product-body h3 { margin-bottom: 10px; font-size: 18px; }
.product-body p { font-size: 14.5px; color: var(--muted); flex: 1; }

.product-empty { text-align: center; color: var(--muted); padding: 30px 0; }

/* ============ 9. 关于我们 ============ */
.about-grid { align-items: center; gap: 44px; }
.about-visual { position: relative; }
.about-img {
  display: block; width: 100%; height: auto;
  aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  background: var(--brand-light);
}
.about-badge {
  position: absolute; right: -8px; bottom: -18px;
  background: #fff; border-radius: var(--radius); padding: 16px 22px;
  box-shadow: var(--shadow-lg); border-left: 4px solid var(--accent);
  display: flex; flex-direction: column; gap: 2px;
}
.about-badge strong { font-size: 26px; color: var(--brand); line-height: 1.1; }
.about-badge span { font-size: 12.5px; color: var(--muted); }

.about-text h2 { margin: 8px 0 18px; }
.about-text p { margin-bottom: 14px; font-size: 15.5px; }
.about-points { margin: 20px 0 26px; display: flex; flex-direction: column; gap: 10px; }
.about-points li { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; color: var(--text); }
.about-points span {
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; margin-top: 3px;
  background: var(--brand-light); color: var(--brand);
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
}

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 28px; }
.stat { text-align: center; padding: 16px 8px; background: var(--bg-soft); border-radius: var(--radius); }
.stat strong { display: block; font-size: 24px; color: var(--brand); line-height: 1.2; }
.stat strong em { font-style: normal; font-size: 15px; color: var(--accent); margin-left: 1px; }
.stat span { font-size: 12.5px; color: var(--muted); }

/* ============ 10. 服务流程 ============ */
.flow-list { display: grid; grid-template-columns: 1fr; gap: 18px; }
.flow-list li {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 26px 24px; position: relative; box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.flow-list li:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.flow-no {
  display: block; font-size: 26px; font-weight: 800; color: var(--brand-light);
  letter-spacing: -.02em; margin-bottom: 6px;
}
.flow-list h3 { margin-bottom: 8px; font-size: 17.5px; }
.flow-list p { font-size: 14.5px; color: var(--muted); }

/* ============ 11. 联系与留言表单 ============ */
.contact-grid { gap: 42px; align-items: start; }
.contact-info h2 { margin: 8px 0 14px; }
.contact-lead { font-size: 15.5px; color: var(--muted); margin-bottom: 26px; }

.contact-list { display: flex; flex-direction: column; gap: 18px; }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; }
.ci-ico {
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 11px;
  background: var(--brand-light); color: var(--brand);
  display: grid; place-items: center; font-size: 19px;
}
.contact-list em { display: block; font-style: normal; font-size: 12.5px; color: var(--muted); margin-bottom: 2px; }
.contact-list a, .contact-list span { font-size: 15.5px; color: var(--ink); font-weight: 600; word-break: break-all; }
.contact-list a:hover { color: var(--brand); }
.contact-list li > div > span { font-weight: 500; }

.contact-form-wrap { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px 28px 26px; box-shadow: var(--shadow); }
.form-title { font-size: 19px; margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }

.field { margin-bottom: 18px; position: relative; }
.field label { display: block; font-size: 14.5px; font-weight: 600; color: var(--ink); margin-bottom: 7px; }
.field label i { color: #d9534f; font-style: normal; }
.field input, .field textarea {
  width: 100%; padding: 12px 14px; min-height: 46px;
  border: 1.5px solid var(--line); border-radius: 8px; background: #fcfdff;
  font-size: 15px; transition: border-color .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: #a8b2c1; }
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--brand-mid); background: #fff;
  box-shadow: 0 0 0 4px rgba(45, 107, 184, .12);
}
.field.has-error input, .field.has-error textarea { border-color: #d9534f; background: #fff8f8; }
.field.is-valid input, .field.is-valid textarea { border-color: #4a9e6a; }

.field-error { font-size: 13px; color: #d9534f; margin-top: 6px; min-height: 0; }
.field-counter { position: absolute; right: 2px; bottom: -20px; font-size: 12.5px; color: var(--muted); }

/* 隐藏蜜罐字段（防机器人，人不可见） */
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-tip { font-size: 12.5px; color: var(--muted); text-align: center; margin-top: 12px; }

/* 提交结果提示条 */
.form-alert {
  margin-top: 18px; padding: 14px 16px; border-radius: 8px;
  font-size: 14.5px; line-height: 1.7;
  animation: alertIn .35s var(--ease);
}
.form-alert.is-success { background: #eef7f1; border: 1px solid #bfe0cc; color: #2f6d47; }
.form-alert.is-error { background: #fdf2f2; border: 1px solid #f3c9c9; color: #a94442; }
@keyframes alertIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

/* ============ 12. 页脚 ============ */
.site-footer { background: #101a2b; color: #b9c3d1; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 34px; padding: 56px 20px 44px; }
.footer-col h3 { color: #fff; font-size: 16px; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col li, .footer-col a { font-size: 14.5px; color: #b9c3d1; line-height: 1.7; }
.footer-col a:hover { color: var(--accent); }
.footer-logo {
  display: inline-block; background: #fff; border-radius: 10px;
  padding: 6px 8px; margin-bottom: 16px; line-height: 0;
}
.footer-logo img { height: 56px; width: auto; }
.footer-about p { font-size: 14.5px; color: #9aa6b8; margin-top: 0; line-height: 1.8; }
.logo-light .logo-text strong { color: #fff; }
.footer-contact li { word-break: break-all; }

.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 20px 0; text-align: center; font-size: 13.5px; color: #8b97aa; }
.footer-bottom a { color: #8b97aa; }
.footer-bottom a:hover { color: var(--accent); }
.footer-bottom .sep { margin: 0 6px; opacity: .5; }

/* ============ 13. 移动端固定 CTA 栏 + 回到顶部 ============ */
.mobile-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 90;
  display: flex; background: #fff; border-top: 1px solid var(--line);
  box-shadow: 0 -4px 18px rgba(20, 40, 80, .1);
}
.mobile-cta a {
  flex: 1; min-height: 54px; display: flex; align-items: center; justify-content: center; gap: 7px;
  font-size: 15.5px; font-weight: 600; color: var(--brand);
}
.mobile-cta a.is-main { background: var(--accent); color: #fff; }
.mobile-cta a:active { opacity: .88; }

.back-top {
  position: fixed; right: 16px; bottom: 74px; z-index: 92;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--brand); color: #fff; font-size: 18px;
  display: grid; place-items: center; box-shadow: var(--shadow);
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.back-top:hover { background: var(--brand-dark); transform: translateY(-3px); }

/* ============ 14. 滚动进入动画（尊重系统"减少动效"设置） ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* =========================================================================
   15. 响应式：平板及以上（≥768px）
   ========================================================================= */
@media (min-width: 768px) {
  .section { padding: 92px 0; }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .slides { height: 560px; }
  .slide-desc { font-size: 17px; }

  .nav-desktop { display: flex; }
  .header-tel { display: inline-flex; }
  .menu-btn { display: none; }
  .nav-mobile { display: none !important; }

  .flow-list { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1.3fr; }
  .mobile-cta { display: none; }
  .back-top { bottom: 28px; right: 24px; }
  .about-badge { right: -22px; }
}

/* =========================================================================
   16. 响应式：桌面大屏（≥1024px）
   ========================================================================= */
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .flow-list { grid-template-columns: repeat(4, 1fr); }
  .slides { height: 620px; }
  .hero-arrow { width: 52px; height: 52px; }
  .hero-prev { left: 28px; }
  .hero-next { right: 28px; }
  .contact-form-wrap { padding: 36px 34px 30px; }
}

/* =========================================================================
   17. 响应式：小屏手机（≤480px）微调
   ========================================================================= */
@media (max-width: 480px) {
  .section { padding: 58px 0; }
  .slides { height: 520px; }
  .slide-content { justify-content: flex-end; padding-bottom: 72px; }
  .slide-tag { margin-bottom: 12px; font-size: 12px; }
  .slide-desc { font-size: 14.5px; margin-top: 12px; }
  .slide-btns { width: 100%; gap: 10px; margin-top: 22px; }
  .slide-btns .btn { flex: 1; padding: 11px 14px; font-size: 14.5px; }
  .hero-arrow { display: none; }          /* 小屏靠指示点与滑动切换，避免遮挡文字 */
  .stats { grid-template-columns: 1fr; gap: 10px; }
  .stat { padding: 12px 8px; }
  .about-badge { right: 8px; bottom: -14px; padding: 12px 16px; }
  .contact-form-wrap { padding: 24px 18px 22px; }
  .logo-text strong { font-size: 15.5px; }
  .logo-text small { font-size: 8.5px; letter-spacing: .1em; }
  .logo-mark-img { width: 36px; height: 36px; }
  .footer-logo img { height: 48px; }
}

/* ============ 18. 打印样式（方便把方案页直接打印给客户） ============ */
@media print {
  .site-header, .mobile-cta, .back-top, .hero-arrow, .hero-dots, .hero-progress, .filter-bar { display: none !important; }
  body { color: #000; }
  .slide { position: relative; opacity: 1; visibility: visible; page-break-after: always; }
  .slides { height: auto; }
}