@charset "UTF-8";
/* ==========================================================================
   一起拼科技 · 官网样式
   设计取向：浅色专业商务 + 品牌蓝（取自 logo 原生色值 #335BFF / #0A96F5）
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 品牌色：直接取自 logo.svg 原生 fill，保证品牌一致性 */
  --brand: #335bff;
  --brand-600: #2a4ce0;
  --brand-700: #1f39b4;
  --brand-soft: #eef2ff;
  --accent: #0a96f5;
  --accent-soft: #e6f5ff;

  /* 中性色 */
  --ink: #0d1526;          /* 标题 */
  --ink-2: #1e2a44;        /* 次级标题 */
  --body: #4a5875;         /* 正文 */
  --muted: #78849c;        /* 辅助文字 */
  --line: #e4eaf4;         /* 分隔线 */
  --line-2: #eef2f8;
  --surface: #ffffff;
  --surface-2: #f6f9fd;    /* 浅灰底区块 */
  --surface-3: #eef4fb;

  /* 深色区（CTA / 页脚） */
  --navy: #0a1730;
  --navy-2: #122444;

  /* 语义色 */
  --ok: #12a878;
  --warn: #e8890c;

  /* 排版 */
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;

  /* 尺寸 */
  --wrap: 1200px;
  --nav-h: 72px;
  --r-sm: 8px;
  --r: 14px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* 阴影：克制的柔和投影，不用发光 */
  --sh-1: 0 1px 2px rgba(13, 21, 38, .05), 0 1px 3px rgba(13, 21, 38, .04);
  --sh-2: 0 2px 6px rgba(13, 21, 38, .05), 0 8px 24px rgba(13, 21, 38, .06);
  --sh-3: 0 4px 12px rgba(13, 21, 38, .07), 0 18px 48px rgba(13, 21, 38, .10);
  --sh-brand: 0 6px 18px rgba(51, 91, 255, .24);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--body);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, picture, video { display: block; max-width: 100%; }
img { height: auto; }

a {
  color: var(--brand);
  text-decoration: none;
  transition: color .18s var(--ease);
}
a:hover { color: var(--brand-700); }

button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: rgba(51, 91, 255, .16); color: var(--ink); }

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--brand);
  color: #fff;
  border-radius: var(--r-sm);
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; color: #fff; }

/* ---------- 3. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 32px;
}

.section { padding-block: 108px; }
.section--tint { background: var(--surface-2); }
.section--tight { padding-block: 64px 16px; }

/* 区块标题 */
.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 5px 14px 5px 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: var(--r-pill);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}

.h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}
.h3 {
  font-size: clamp(19px, 2vw, 22px);
  line-height: 1.45;
  font-weight: 650;
  color: var(--ink);
}
.sec-desc {
  margin-top: 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--body);
}
/* 主色短语整体不拆行，避免出现「…量 / 身构建…」这类难看的断字 */
.h2 em {
  font-style: normal;
  color: var(--brand);
  white-space: nowrap;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 26px;
  font-size: 15.5px;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  white-space: nowrap;
  transition: background .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease),
              box-shadow .2s var(--ease);
}
.btn svg { flex: none; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--brand);
  color: #fff;
  box-shadow: var(--sh-brand);
}
.btn--primary:hover {
  background: var(--brand-600);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(51, 91, 255, .32);
}

.btn--ghost {
  background: #fff;
  color: var(--ink-2);
  border-color: var(--line);
}
.btn--ghost:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: var(--brand-soft);
}

.btn--light {
  background: #fff;
  color: var(--navy);
}
.btn--light:hover { background: #eaf1ff; color: var(--brand-700); }

.btn--outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, .34);
}
.btn--outline-light:hover {
  background: rgba(255, 255, 255, .1);
  border-color: rgba(255, 255, 255, .6);
  color: #fff;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

/* 文字链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
}
.link-arrow svg { transition: transform .2s var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ==========================================================================
   5. 导航
   ========================================================================== */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease),
              background .25s var(--ease);
}
.nav.is-stuck {
  background: rgba(255, 255, 255, .95);
  border-bottom-color: var(--line);
  box-shadow: 0 2px 14px rgba(13, 21, 38, .05);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 32px;
}

.logo { display: flex; align-items: center; flex: none; }
.logo img { width: 132px; height: auto; }

.nav__menu {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  border-radius: var(--r-sm);
  transition: color .18s var(--ease), background .18s var(--ease);
}
.nav__link:hover { color: var(--brand); background: var(--brand-soft); }
.nav__link.is-active { color: var(--brand); font-weight: 600; }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 1px;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
}

.nav__cta { margin-left: 12px; height: 40px; padding: 0 20px; font-size: 14.5px; }

.nav__burger {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  padding: 0;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}
.nav__burger span {
  display: block;
  width: 18px;
  height: 1.8px;
  margin: 3.4px auto;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.2px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.2px) rotate(-45deg); }

/* 语言切换按钮 */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.lang-toggle:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }

/* ==========================================================================
   6. 首屏：居中文案区（浅蓝渐变 + 细网格，不用图片做背景）
   --------------------------------------------------------------------------
   说明：原站 banner 是自带完整文案的成品宣传图（标题/副标题/产品标签俱全），
   因此首屏文案与 banner 必须各自独立，不能叠放，否则出现双重标题。
   ========================================================================== */
.hero {
  position: relative;
  padding-top: calc(var(--nav-h) + 92px);
  padding-bottom: 80px;
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(880px 420px at 50% -6%, rgba(51, 91, 255, .11), transparent 68%),
    radial-gradient(660px 360px at 88% 14%, rgba(10, 150, 245, .09), transparent 70%),
    /* 底部色收在中性浅灰白，与下方 banner 顶部（近白）自然衔接，无明显分界 */
    linear-gradient(180deg, #f1f6ff 0%, #f7faff 58%, #eff3f9 100%);
}
/* 细网格纹理，向四周淡出 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(51, 91, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51, 91, 255, .055) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: radial-gradient(circle at 50% 36%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 50% 36%, #000 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner { position: relative; z-index: 1; }
.hero__content { max-width: 880px; margin-inline: auto; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 34px;
  padding: 0 16px 0 12px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--brand-700);
  background: #fff;
  border: 1px solid rgba(51, 91, 255, .16);
  border-radius: var(--r-pill);
  box-shadow: var(--sh-1);
}
.hero__badge i {
  width: 7px;
  height: 7px;
  background: var(--brand);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(51, 91, 255, .16);
}

.hero__title {
  margin-top: 26px;
  font-size: clamp(32px, 4.4vw, 54px);
  line-height: 1.22;
  font-weight: 750;
  letter-spacing: -.02em;
  color: var(--ink);
}
.hero__title em {
  font-style: normal;
  color: var(--brand);
  position: relative;
  white-space: nowrap;
}
.hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .1em;
  height: .16em;
  background: rgba(51, 91, 255, .18);
  border-radius: 4px;
  z-index: -1;
}

.hero__desc {
  margin: 22px auto 0;
  max-width: 680px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--body);
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 28px;
}
.hero__tags li {
  padding: 5px 14px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink-2);
  background: rgba(255, 255, 255, .82);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.hero__tags li:hover { border-color: rgba(51, 91, 255, .4); color: var(--brand); }

.hero .btn-row { justify-content: center; }

/* ==========================================================================
   6b. 主视觉通栏：原站成品 banner，自带文案，故完整展示、不叠加、不裁切
   ========================================================================== */
.banner-band {
  position: relative;
  background: #edf4fd;
  overflow: hidden;
}

.slider {
  position: relative;
  /* 与 banner 原生比例一致，切换时不产生高度跳动 */
  aspect-ratio: 2880 / 900;
}
.slider__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .8s var(--ease);
}
.slider__slide.is-active { opacity: 1; }
.slider__slide picture { display: block; height: 100%; }
.slider__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 轮播指示器：胶囊条，浮于图右下 */
.slider__dots {
  position: absolute;
  right: 30px;
  bottom: 26px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, .72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--r-pill);
  box-shadow: 0 2px 12px rgba(13, 21, 38, .12);
}
.slider__dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  background: rgba(51, 91, 255, .28);
  border: 0;
  border-radius: 50%;
  transition: background .25s var(--ease), width .25s var(--ease);
}
.slider__dots button:hover { background: rgba(51, 91, 255, .55); }
.slider__dots button.is-active {
  width: 24px;
  background: var(--brand);
  border-radius: var(--r-pill);
}

/* ==========================================================================
   7. 数据条
   ========================================================================== */
.metrics {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--sh-2);
  overflow: hidden;
}
.metrics__item {
  padding: 28px 30px;
  border-left: 1px solid var(--line-2);
}
.metrics__item:first-child { border-left: 0; }
.metrics__num {
  font-size: 34px;
  line-height: 1.1;
  font-weight: 720;
  letter-spacing: -.02em;
  color: var(--ink);
}
.metrics__num span { font-size: 18px; font-weight: 600; color: var(--brand); margin-left: 2px; }
.metrics__label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

/* ==========================================================================
   8. 产品中心
   ========================================================================== */
.prod-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.prod-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              border-color .25s var(--ease);
}
.prod-card:hover {
  transform: translateY(-4px);
  border-color: rgba(51, 91, 255, .32);
  box-shadow: var(--sh-3);
}

.prod-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  background: var(--brand-soft);
  border-radius: 12px;
}
.prod-card__icon img { width: 28px; height: 28px; }

.prod-card__name {
  font-size: 17.5px;
  font-weight: 680;
  color: var(--ink);
}
.prod-card__desc {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--body);
}
.prod-card__list {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}
.prod-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}
.prod-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
}

/* ==========================================================================
   9. 全链路流程
   ========================================================================== */
.chain {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 12px;
  position: relative;
}
.chain__node {
  position: relative;
  padding: 22px 12px 20px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.chain__node:hover { border-color: rgba(51, 91, 255, .3); box-shadow: var(--sh-2); }
.chain__node:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -12px;
  width: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  opacity: .5;
}
.chain__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-size: 13px;
  font-weight: 700;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 50%;
}
.chain__name {
  margin-top: 12px;
  font-size: 16px;
  font-weight: 650;
  color: var(--ink);
}
.chain__meta {
  margin-top: 5px;
  font-size: 12.5px;
  color: var(--muted);
}

.chain-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding: 16px 22px;
  font-size: 14.5px;
  color: var(--ink-2);
  background: var(--accent-soft);
  border: 1px solid rgba(10, 150, 245, .18);
  border-radius: var(--r);
}
.chain-note svg { flex: none; color: var(--accent); }

/* ==========================================================================
   10. 优势
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.why-card {
  padding: 30px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
              border-color .25s var(--ease);
}
.why-card:hover {
  transform: translateY(-4px);
  border-color: rgba(51, 91, 255, .3);
  box-shadow: var(--sh-3);
}
.why-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  background: var(--accent-soft);
  border-radius: 12px;
}
.why-card__icon img { width: 26px; height: 26px; }
.why-card__title {
  font-size: 17.5px;
  font-weight: 680;
  color: var(--ink);
}
.why-card__desc {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--body);
}

/* ==========================================================================
   11. 关于我们
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: stretch;
}

.about__figure {
  position: relative;
  height: 100%;
  min-height: 320px;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-3);
}
.about__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.about__tag {
  position: absolute;
  left: 20px;
  bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  background: rgba(10, 23, 48, .78);
  backdrop-filter: blur(8px);
  border-radius: var(--r-sm);
}
.about__tag i {
  width: 7px; height: 7px; background: #34d399; border-radius: 50%;
}

.about__lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--body);
}
.about__lead + .about__lead { margin-top: 22px; }

.about__points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 24px;
  margin-top: 34px;
  padding: 22px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.about__points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-2);
}
.about__points svg { flex: none; margin-top: 4px; color: var(--brand); }

/* ==========================================================================
   12. 联系我们
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 48px;
  align-items: stretch;
}

.info-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--sh-1);
}
/* 二维码块推至卡片底部，与右侧表单底边对齐 */
.info-card .qr-block { margin-top: auto; padding-top: 22px; }
.info-card__title {
  font-size: 17px;
  font-weight: 680;
  color: var(--ink);
  margin-bottom: 18px;
}

.info-list li {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-2);
}
.info-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.info-list__ico {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: none;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 10px;
}
.info-list__k { font-size: 12.5px; color: var(--muted); }
.info-list__v {
  margin-top: 2px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}
/* 电话 / 邮箱：可直接点击拨打与发信 */
.info-list__v a {
  color: var(--brand-700);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease), color .2s var(--ease);
  word-break: break-all;
}
.info-list__v a:hover { color: var(--brand); border-bottom-color: currentColor; }

.qr-block {
  display: flex;
  gap: 18px;
  align-items: center;
  margin-top: 22px;
  padding: 18px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.qr-block img {
  width: 104px;
  height: 104px;
  flex: none;
  padding: 5px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.qr-block__t { font-size: 14.5px; font-weight: 650; color: var(--ink); }
.qr-block__d { margin-top: 4px; font-size: 13px; color: var(--muted); }

/* 表单 */
.form-card {
  padding: 34px 34px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-2);
  display: flex;
  flex-direction: column;
}
.form-card form {
  display: flex;
  flex: 1;
  flex-direction: column;
}
/* 需求输入框随左侧卡片高度自动撑满，保持两卡底部对齐 */
.field--grow { flex: 1; display: flex; flex-direction: column; }
.field--grow textarea { flex: 1; min-height: 104px; }
.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.field { margin-bottom: 16px; }
.field label {
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-2);
}
.field label .req { color: #e5484d; margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 14px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.field textarea { min-height: 104px; resize: vertical; }
.field input::placeholder,
.field textarea::placeholder { color: #a4aec2; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(51, 91, 255, .13);
}
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] { border-color: #e5484d; }

.field__err {
  display: none;
  margin-top: 6px;
  font-size: 12.5px;
  color: #d13438;
}
.field.has-error .field__err { display: block; }

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.form-check input { margin-top: 3px; accent-color: var(--brand); flex: none; }

.form-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: auto;
  padding-top: 20px;
}
.form-note { font-size: 12.5px; color: var(--muted); }

.form-tip {
  display: none;
  margin-top: 14px;
  padding: 12px 16px;
  font-size: 14px;
  border-radius: var(--r-sm);
}
.form-tip--ok { background: #e8f8f1; color: #0a7a55; border: 1px solid #b7e6d1; }
.form-tip--err { background: #fdecec; color: #b3261e; border: 1px solid #f6c9c6; }
.form-tip.is-show { display: block; }

/* FAQ */
.faq { margin-top: 64px; }
.faq__list {
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: #fff;
}
.faq__item + .faq__item { border-top: 1px solid var(--line); }
.faq__q {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 24px;
  font-size: 15.5px;
  font-weight: 600;
  text-align: left;
  color: var(--ink);
  background: none;
  border: 0;
  transition: background .18s var(--ease);
}
.faq__q:hover { background: var(--surface-2); }
.faq__q span { flex: 1; }
.faq__q svg { flex: none; color: var(--brand); transition: transform .25s var(--ease); }
.faq__q[aria-expanded="true"] svg { transform: rotate(180deg); }
.faq__a {
  display: none;
  padding: 0 24px 20px 24px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--body);
}
.faq__a.is-open { display: block; }

/* ==========================================================================
   13. CTA 通栏
   ========================================================================== */
.cta-band {
  position: relative;
  padding-block: 84px;
  background: var(--navy);
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -8%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(51, 91, 255, .34), transparent 66%);
}
.cta-band::after {
  content: "";
  position: absolute;
  bottom: -70%;
  left: -6%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(10, 150, 245, .22), transparent 68%);
}
.cta-band__inner { position: relative; z-index: 1; text-align: center; }
.cta-band__title {
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1.35;
  font-weight: 720;
  color: #fff;
}
.cta-band__desc {
  max-width: 620px;
  margin: 16px auto 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .72);
}
.cta-band .btn-row { justify-content: center; }

/* ==========================================================================
   14. 页脚
   ========================================================================== */
.footer {
  padding-block: 60px 28px;
  background: var(--navy);
  color: rgba(255, 255, 255, .6);
  font-size: 14px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.35fr .75fr .7fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer__logo img { width: 148px; filter: brightness(0) invert(1); opacity: .95; }
.footer__slogan {
  margin-top: 18px;
  max-width: 300px;
  line-height: 1.8;
}
/* 页脚公众号二维码：补齐品牌栏高度，四栏视觉平衡 */
.footer__qr {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 24px;
  padding: 14px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 12px;
  width: fit-content;
}
.footer__qr img {
  width: 88px;
  height: 88px;
  flex: none;
  padding: 4px;
  background: #fff;
  border-radius: 8px;
}
.footer__qr-t { font-size: 13.5px; font-weight: 650; color: rgba(255, 255, 255, .9); }
.footer__qr-d { margin-top: 5px; font-size: 12.5px; line-height: 1.65; color: rgba(255, 255, 255, .48); }
.footer__col h3 {
  margin-bottom: 16px;
  font-size: 14.5px;
  font-weight: 650;
  color: #fff;
}
.footer__col li { padding: 5px 0; }
.footer__col a { color: rgba(255, 255, 255, .6); }
.footer__col a:hover { color: #fff; }

/* 页脚联系方式：电话与邮箱更醒目，地址以标签区分两地 */
.footer__contact li { padding: 0 0 9px; line-height: 1.75; }
.footer__contact li:last-child { padding-bottom: 0; }
.footer__contact a { font-weight: 600; color: rgba(255, 255, 255, .86); }
.footer__contact a:hover { color: #fff; text-decoration: underline; }
.footer__contact-addr { color: rgba(255, 255, 255, .52); }
.footer__contact-addr span {
  display: block;
  margin-bottom: 2px;
  font-size: 12px;
  font-weight: 600;
  color: rgba(255, 255, 255, .78);
  letter-spacing: .04em;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, .45);
}
.footer__bottom a {
  color: rgba(255, 255, 255, .6);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer__bottom a:hover { color: #fff; border-bottom-color: rgba(255, 255, 255, .4); }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  color: #fff;
  background: var(--brand);
  border: 0;
  border-radius: 50%;
  box-shadow: var(--sh-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease),
              visibility .25s, background .2s var(--ease);
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--brand-600); color: #fff; }

/* ---------- 滚动入场（渐进增强） ----------
   默认可见；仅当 JS 就绪（html.js）时才启用入场动画。
   这样脚本异常、被拦截或爬虫无 JS 时，页面内容依然完整可读。 */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
html.js .reveal.is-in { opacity: 1; transform: none; }

/* ==========================================================================
   15. 响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .prod-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .chain { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
  .chain__node:nth-child(n + 5)::after { display: none; }
}

@media (max-width: 1024px) {
  :root { --nav-h: 64px; }
  .wrap, .nav__inner { padding-inline: 24px; }

  .nav__burger { display: block; }
  .nav__menu {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px 24px 22px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--sh-3);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .nav__menu.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__link { padding: 12px 8px; font-size: 16px; }
  .nav__link.is-active::after { display: none; }
  .nav__cta { margin: 10px 0 0; height: 46px; }

  .hero {
    padding-top: calc(var(--nav-h) + 64px);
    padding-bottom: 60px;
  }
  .hero__content { max-width: 100%; }

  .section { padding-block: 72px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metrics__item:nth-child(odd) { border-left: 0; }
  .metrics__item:nth-child(n + 3) { border-top: 1px solid var(--line-2); }

  .why-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about__figure { height: auto; min-height: 0; }
  .about__figure img { height: auto; aspect-ratio: 16 / 10; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .prod-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  /* 品牌栏独占一行，其余四栏两两成对，避免出现落单的空档 */
  .footer__col:first-child { grid-column: 1 / -1; }
  .footer__slogan { max-width: 460px; }
}

@media (max-width: 640px) {
  .wrap, .nav__inner { padding-inline: 18px; }
  .section { padding-block: 56px; }
  .sec-head { margin-bottom: 36px; }
  /* 窄屏放开限制，避免长短语溢出容器 */
  .h2 em { white-space: normal; }
  .hero__title { font-size: 30px; }
  .hero__desc { font-size: 15.5px; }
  .hero__tags { gap: 6px; }
  .hero__tags li { padding: 4px 11px; font-size: 12.5px; }

  /* 移动端换用竖版 banner，比例同步切换 */
  .slider { aspect-ratio: 828 / 795; }
  .slider__dots { right: 14px; bottom: 14px; padding: 7px 11px; gap: 7px; }

  .prod-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .chain { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chain__node:not(:last-child)::after { display: none; }
  .about__points { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 24px 20px; }
  .metrics { grid-template-columns: 1fr; }
  .metrics__item { border-left: 0; }
  .metrics__item + .metrics__item { border-top: 1px solid var(--line-2); }
  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .to-top { right: 16px; bottom: 16px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .nav, .to-top, .slider__dots, .cta-band { display: none !important; }
  body { color: #000; }
}