/* ============================================================
   成都创智启源科技有限公司 官网样式
   配色取自公司 Logo：天青蓝 → 湖青绿 渐变
   浅色科技风 · 单页瀑布式 · 全端自适应
   ============================================================ */

:root {
  /* 品牌色（提取自 Logo） */
  --brand: #1E92E0;          /* 主色：Logo 英文字标准蓝 */
  --brand-dark: #1479BF;     /* 深色：正文链接 / 悬停 */
  --brand-light: #4AB5EE;    /* 浅色：装饰 */
  --accent: #29D6C4;         /* 辅助色：Logo 右侧湖青 */
  --accent-dark: #12A897;
  --brand-grad: linear-gradient(135deg, #35B9EC 0%, #29D6C4 100%);

  /* 中性色（浅色体系） */
  --bg: #FFFFFF;
  --bg-soft: #F5F9FD;
  --bg-soft2: #EAF3FB;
  --card: #FFFFFF;
  --border: #E2EDF6;
  --border-strong: #CCE0F0;

  /* 文字 */
  --text: #17324A;
  --text-2: #45607A;
  --text-3: #7B91A8;
  --text-inverse: #FFFFFF;
  --text-on-brand: #FFFFFF;

  /* 功能 */
  --shadow-sm: 0 2px 8px rgba(30, 146, 224, .06);
  --shadow-md: 0 8px 24px rgba(30, 146, 224, .10);
  --shadow-lg: 0 16px 40px rgba(30, 146, 224, .14);

  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 74px;

  --container: 1200px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 14px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
::selection { background: rgba(30, 146, 224, .18); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; width: 100%; }

/* ============ 通用组件 ============ */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius-sm); font-weight: 600; letter-spacing: .02em;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s, color .25s, border-color .25s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand-grad); color: var(--text-on-brand);
  box-shadow: 0 6px 18px rgba(30, 146, 224, .26);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(30, 146, 224, .34); }
.btn-outline {
  border: 1.5px solid var(--border-strong); color: var(--brand-dark); background: rgba(255,255,255,.85);
}
.btn-outline:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

.section { padding: 96px 0; position: relative; }
.section-head { text-align: center; max-width: 660px; margin: 0 auto 56px; }
.section-tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--brand-dark); background: rgba(30, 146, 224, .09);
  border: 1px solid rgba(30, 146, 224, .18);
  padding: 4px 14px; border-radius: 999px; margin-bottom: 16px;
}
.section-title { font-size: clamp(24px, 3vw, 36px); font-weight: 700; letter-spacing: -.5px; line-height: 1.35; }
.section-sub { color: var(--text-3); font-size: clamp(14px, 1.4vw, 17px); margin-top: 12px; }

/* 进场动效 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ 顶部导航 ============ */

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 1000; height: var(--header-h);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s, background .3s;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); border-bottom-color: var(--border); background: rgba(255,255,255,.97); }

.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: var(--header-h); }

.brand { display: flex; align-items: center; flex-shrink: 0; gap: 10px; }
.brand-icon { height: 40px; width: auto; }
.brand-logo { height: 44px; width: auto; }

.brand-fallback { display: none; align-items: center; gap: 10px; }
.brand-fallback-icon {
  width: 38px; height: 38px; border-radius: 10px; background: var(--brand-grad);
  position: relative; flex-shrink: 0;
}
.brand-fallback-icon::before, .brand-fallback-icon::after { content: ""; position: absolute; background: #fff; border-radius: 2px; }
.brand-fallback-icon::before { width: 16px; height: 4px; top: 12px; left: 11px; box-shadow: 0 6px 0 #fff; }
.brand-fallback-icon::after { width: 4px; height: 6px; top: 20px; left: 11px; box-shadow: 12px 0 0 #fff; }
.brand-fallback-text { font-size: 20px; font-weight: 700; color: var(--text); line-height: 1.2; letter-spacing: .02em; }
.brand-fallback-text small { display: block; font-size: 10px; font-weight: 600; color: var(--text-3); letter-spacing: .12em; }

/* 导航：一律不换行 */
.main-nav { display: flex; align-items: center; gap: 2px; }
.nav-link {
  position: relative; padding: 8px 12px; font-size: 15px; color: var(--text-2);
  border-radius: 8px; transition: color .25s; white-space: nowrap !important; word-break: keep-all;
  flex-shrink: 0;
}
.nav-link::after {
  content: ""; position: absolute; left: 50%; bottom: 3px; width: 0; height: 2.5px;
  background: var(--brand-grad); border-radius: 2px; transform: translateX(-50%);
  transition: width .3s var(--ease);
}
.nav-link:hover { color: var(--brand); }
.nav-link.active { color: var(--brand); font-weight: 600; }
.nav-link.active::after { width: 20px; }
.mobile-only { display: none; }

.header-actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.header-phone {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 700; color: var(--brand-dark); white-space: nowrap;
  font-family: "DIN Alternate", "Inter", "Poppins", sans-serif;
}
.header-phone svg { color: var(--brand); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s var(--ease); }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ 首屏 ============ */

.hero {
  position: relative; padding: calc(var(--header-h) + 68px) 0 92px;
  background: linear-gradient(180deg, #EDF6FD 0%, #FFFFFF 100%);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
  position: absolute; inset: 0; opacity: .55;
  background-image:
    linear-gradient(rgba(30,146,224,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,146,224,.07) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(90px); }
.hero-glow-1 { width: 480px; height: 480px; top: -160px; left: -120px; background: rgba(30,146,224,.14); }
.hero-glow-2 { width: 420px; height: 420px; top: -80px; right: -140px; background: rgba(41,214,196,.14); }

.hero-inner { position: relative; display: grid; grid-template-columns: 1.45fr 1fr; gap: 56px; align-items: center; }

.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border-strong);
  color: var(--brand-dark); font-size: 14px; font-weight: 600;
  padding: 7px 16px; border-radius: 999px; box-shadow: var(--shadow-sm);
}
.tag-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(41,214,196,.2); flex-shrink: 0; }

.hero-title {
  font-size: clamp(26px, 4.2vw, 50px); font-weight: 800;
  letter-spacing: -1px; margin: 20px 0 10px; line-height: 1.24;
}
.hero-slogan {
  font-size: clamp(17px, 2.1vw, 26px); font-weight: 700; color: var(--text-2);
  letter-spacing: .02em; margin-bottom: 18px;
}
.hero-slogan em {
  font-style: normal;
  background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-desc { color: var(--text-3); font-size: clamp(14px, 1.4vw, 17px); margin-bottom: 32px; }
.hero-desc .desc-item { display: block; }
.hero-desc .desc-line { display: block; margin-top: 14px; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 26px; }

.hero-points { display: flex; flex-wrap: wrap; gap: 12px 22px; }
.hero-points li { display: flex; align-items: center; gap: 7px; font-size: 15px; color: var(--text-2); font-weight: 500; }
.hero-points svg { color: var(--accent-dark); flex-shrink: 0; }

/* 二维码卡片（保持原图完整比例，避免裁掉定位点） */
.hero-qr { text-align: center; justify-self: center; }
.qr-card {
  position: relative; background: #fff; padding: 16px;
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  width: max-content; margin: 0 auto;
}
.qr-img-box {
  width: 190px; background: #fff; border-radius: 10px; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.qr-img-box img { width: 100%; height: auto; cursor: zoom-in; transition: transform .3s var(--ease); }
.qr-card:hover .qr-img-box img { transform: scale(1.03); }
.qr-placeholder { text-align: center; color: var(--text-3); padding: 28px 12px; min-height: 190px; }
.qr-placeholder svg { color: var(--brand-light); margin: 0 auto 10px; }
.qr-placeholder p { font-size: 13px; line-height: 1.6; }
.qr-placeholder code { font-size: 11px; color: var(--brand); word-break: break-all; }

.qr-title { font-size: 17px; font-weight: 700; margin-top: 12px; color: var(--text); }
.qr-sub { font-size: 13px; color: var(--text-3); margin-top: 2px; }

.qr-corner { position: absolute; width: 22px; height: 22px; border: 3px solid var(--brand); }
.qr-corner-tl { top: -6px; left: -6px; border-right: none; border-bottom: none; border-radius: 6px 0 0 0; }
.qr-corner-tr { top: -6px; right: -6px; border-left: none; border-bottom: none; border-radius: 0 6px 0 0; }
.qr-corner-bl { bottom: -6px; left: -6px; border-right: none; border-top: none; border-radius: 0 0 0 6px; }
.qr-corner-br { bottom: -6px; right: -6px; border-left: none; border-top: none; border-radius: 0 0 6px 0; }

.qr-hint { margin-top: 14px; font-size: 13px; color: var(--text-3); }

.scroll-down {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
  color: var(--text-3); animation: bob 2.2s infinite; padding: 8px;
}
@keyframes bob { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 7px); } }

/* ============ 公司简介 ============ */

.about-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.about-text p { color: var(--text-2); margin-bottom: 16px; }
.about-text strong { color: var(--text); }
.about-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.badge {
  font-size: 13px; font-weight: 600; color: var(--brand-dark);
  background: rgba(30,146,224,.08); border: 1px solid rgba(30,146,224,.16);
  padding: 6px 14px; border-radius: 999px; white-space: nowrap;
}

.about-card {
  position: relative; background: linear-gradient(160deg, #FFFFFF 0%, #F1F8FD 100%);
  border: 1px solid var(--border); border-radius: 20px; padding: 34px 30px;
  box-shadow: var(--shadow-md); overflow: hidden;
}
.about-card-icon {
  width: 64px; height: 64px; border-radius: 16px; overflow: hidden;
  box-shadow: 0 10px 22px rgba(30,146,224,.26); flex-shrink: 0;
}
.about-card-logo { width: 100%; height: 100%; object-fit: contain; }
.about-card-head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.about-card-head .about-card-title { font-size: 20px; line-height: 24px; margin: 0 !important; }
.about-card h3 { font-size: 20px; margin-bottom: 18px; }
.about-list li {
  display: flex; align-items: baseline; gap: 14px;
  padding: 11px 0; border-bottom: 1px dashed var(--border-strong);
  color: var(--text-2); font-size: 15px;
}
.about-list li:last-child { border-bottom: none; }
.list-num {
  font-family: "DIN Alternate", "Inter", sans-serif; font-weight: 700; font-size: 14px;
  color: var(--brand); background: rgba(30,146,224,.09);
  width: 30px; height: 30px; border-radius: 8px;
  display: inline-grid; place-items: center; flex-shrink: 0; transform: translateY(6px);
}
.about-card-deco {
  position: absolute; right: -70px; top: -70px; width: 190px; height: 190px; border-radius: 50%;
  background: radial-gradient(circle, rgba(41,214,196,.16), transparent 70%);
}

/* ============ 核心服务 ============ */

.section-services { background: var(--bg-soft); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.service-card {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 26px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  display: flex; flex-direction: column;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(30,146,224,.35); }

.service-icon {
  width: 58px; height: 58px; border-radius: 14px; display: grid; place-items: center;
  background: rgba(30,146,224,.09); color: var(--brand); margin-bottom: 20px;
  transition: background .3s, color .3s; flex-shrink: 0;
}
.service-card:hover .service-icon { background: var(--brand-grad); color: #fff; }
.service-card h3 { font-size: 19px; margin-bottom: 12px; }
.service-card > p { color: var(--text-3); font-size: 15px; margin-bottom: 18px; }

.service-features { margin-top: auto; display: grid; gap: 8px; }
.service-features li { position: relative; padding-left: 22px; font-size: 14px; color: var(--text-2); }
.service-features li::before {
  content: ""; position: absolute; left: 2px; top: 8px; width: 7px; height: 7px;
  border-radius: 2px; background: var(--brand-grad); transform: rotate(45deg);
}

.service-card-featured {
  border: 1.5px solid transparent;
  background: linear-gradient(#fff, #fff) padding-box, var(--brand-grad) border-box;
  box-shadow: 0 12px 32px rgba(30,146,224,.15);
}
.service-hot {
  position: absolute; top: 18px; right: 18px;
  font-size: 12px; font-weight: 700; color: #fff;
  background: var(--brand-grad); padding: 3px 12px; border-radius: 999px;
  box-shadow: 0 4px 10px rgba(30,146,224,.28);
}

/* ============ AI 落地案例 ============ */

.section-cases {
  background:
    radial-gradient(ellipse 70% 50% at 85% 0%, rgba(41,214,196,.09), transparent 60%),
    radial-gradient(ellipse 60% 45% at 10% 100%, rgba(30,146,224,.08), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, #F3F9FE 50%, #FFFFFF 100%);
}
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.case-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  position: relative; overflow: hidden;
}
.case-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--brand-grad); opacity: 0; transition: opacity .3s;
}
.case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: rgba(30,146,224,.3); }
.case-card:hover::before { opacity: 1; }

.case-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.case-industry {
  font-size: 13px; font-weight: 600; color: var(--text-2);
  background: var(--bg-soft2); padding: 4px 12px; border-radius: 999px; white-space: nowrap;
}
.case-type {
  font-size: 13px; font-weight: 700; color: var(--brand-dark);
  background: rgba(30,146,224,.09); border: 1px dashed rgba(30,146,224,.3);
  padding: 3px 12px; border-radius: 999px; white-space: nowrap;
}
.case-title { font-size: 19px; margin-bottom: 18px; letter-spacing: -.2px; line-height: 1.5; }

.case-body { display: grid; gap: 14px; }
.case-row { display: grid; grid-template-columns: 74px 1fr; gap: 12px; }
.case-label {
  font-size: 13px; font-weight: 700; color: var(--brand);
  height: fit-content; padding-top: 3px; white-space: nowrap;
}
.case-row p { font-size: 14.5px; color: var(--text-2); }
.case-result { background: rgba(41,214,196,.08); border: 1px solid rgba(41,214,196,.22); border-radius: 10px; padding: 10px 12px; }
.case-result .case-label { color: var(--accent-dark); }
.case-result p { color: #1B6B5C; font-weight: 500; }

.cases-note { text-align: center; margin-top: 34px; color: var(--text-3); font-size: 15px; }
.cases-note strong { color: var(--brand); }

/* ============ 服务优势 ============ */

.section-advantages { background: var(--bg-soft); }
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.adv-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.adv-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(30,146,224,.3); }
.adv-icon {
  width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center;
  background: rgba(30,146,224,.09); color: var(--brand); margin-bottom: 16px;
}
.adv-item h4 { font-size: 17px; margin-bottom: 8px; }
.adv-item p { font-size: 14.5px; color: var(--text-3); }

/* ============ 合作流程 ============ */

.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.process-step {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 24px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.process-step:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(30,146,224,.3); }
.step-num {
  position: absolute; top: 18px; right: 22px;
  font-family: "DIN Alternate", "Inter", "Poppins", sans-serif;
  font-size: 42px; font-weight: 800; line-height: 1;
  color: rgba(30,146,224,.10); transition: color .3s;
}
.process-step:hover .step-num { color: rgba(30,146,224,.2); }
.step-icon {
  width: 50px; height: 50px; border-radius: 12px; display: grid; place-items: center;
  background: var(--brand-grad); color: #fff; margin-bottom: 16px;
  box-shadow: 0 8px 18px rgba(30,146,224,.22);
}
.process-step h4 { font-size: 17px; margin-bottom: 8px; }
.process-step p { font-size: 14.5px; color: var(--text-3); }

/* ============ 常见问题 ============ */

.faq-container { max-width: 860px; }
.faq-list { display: grid; gap: 14px; }

.faq-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  overflow: hidden; transition: border-color .3s, box-shadow .3s;
}
.faq-item[open] { border-color: rgba(30,146,224,.35); box-shadow: var(--shadow-md); }
.faq-item summary {
  list-style: none; cursor: pointer; user-select: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 22px; font-weight: 600; font-size: 16px; color: var(--text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--brand); }
.faq-arrow {
  position: relative; width: 11px; height: 11px; flex-shrink: 0;
  border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3);
  transform: rotate(45deg); transition: transform .3s var(--ease); margin-top: -4px;
}
.faq-item[open] .faq-arrow { transform: rotate(-135deg); margin-top: 4px; border-color: var(--brand); }
.faq-answer { padding: 0 22px 20px; }
.faq-answer p { color: var(--text-2); font-size: 15px; }

/* ============ 联系我们 ============ */

.section-contact { background: var(--bg-soft); padding-bottom: 110px; }
.contact-card {
  background:
    radial-gradient(ellipse 55% 70% at 100% 0%, rgba(41,214,196,.12), transparent 60%),
    radial-gradient(ellipse 50% 60% at 0% 100%, rgba(30,146,224,.11), transparent 60%),
    #fff;
  border: 1px solid var(--border); border-radius: 24px;
  box-shadow: var(--shadow-lg); padding: 56px;
}
.contact-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; }
.contact-card .section-tag { margin-bottom: 14px; }
.contact-card .section-title { text-align: left; margin-bottom: 18px; }
.contact-lead { color: var(--text-2); margin-bottom: 28px; }

.contact-list { display: grid; margin-bottom: 30px; }
.contact-list li {
  display: grid; grid-template-columns: 84px 1fr; gap: 14px; align-items: baseline;
  padding: 13px 0; border-bottom: 1px dashed var(--border-strong);
}
.contact-list li:last-child { border-bottom: none; }
.contact-label { font-size: 14px; color: var(--text-3); font-weight: 600; }
.contact-value { font-size: 16px; color: var(--text); font-weight: 500; }
.contact-phone {
  font-family: "DIN Alternate", "Inter", sans-serif; font-size: clamp(20px, 2.2vw, 26px); font-weight: 800;
  color: var(--brand-dark); letter-spacing: .02em;
}
.contact-phone:hover { color: var(--brand); }
.contact-todo { font-style: normal; font-size: 13px; color: var(--text-3); }

.contact-qr { justify-self: center; }
.qr-card-lg { padding: 20px; }
.qr-card-lg .qr-img-box { width: 230px; }

/* ============ 页尾（浅色，适配彩色 Logo） ============ */

.site-footer {
  background: linear-gradient(180deg, #F4F9FE 0%, #FFFFFF 100%);
  border-top: 1px solid var(--border);
  color: var(--text-2); padding: 60px 0 0;
}

.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 44px; padding-bottom: 44px; }
.footer-logo-wrap { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo-icon { height: 44px; width: auto; }
.footer-logo { height: 46px; width: auto; }
.footer-brand .brand-fallback { margin-bottom: 14px; }
.footer-slogan { color: var(--text); font-weight: 600; font-size: 16px; margin-bottom: 8px; }
.footer-desc { font-size: 14px; color: var(--text-3); line-height: 1.9; }
.footer-desc-lead { margin: 0; }
.footer-desc-item { margin: 0; text-indent: 9em; }

.footer-nav h4, .footer-contact h4 { color: var(--text); font-size: 16px; margin-bottom: 18px; letter-spacing: .04em; }
.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a { font-size: 14px; color: var(--text-2); transition: color .25s, transform .25s; width: fit-content; }
.footer-nav a:hover { color: var(--brand); transform: translateX(3px); }

.footer-contact p { font-size: 14px; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.footer-phone svg { color: var(--accent-dark); flex-shrink: 0; }
.footer-wechat svg { color: #2AAE67; flex-shrink: 0; }
.footer-phone a { font-family: "DIN Alternate", "Inter", sans-serif; font-weight: 700; color: var(--brand-dark); font-size: 16px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0; text-align: center;
  font-size: 13.5px; color: var(--text-3);
}
.footer-bottom p { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 4px; }
.footer-bottom a { color: var(--text-3); transition: color .25s; white-space: nowrap; }
.footer-bottom a:hover { color: var(--brand); }

/* ============ 移动端底部操作条 ============ */

.mobile-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 990;
  display: none; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--border); border-top: 1px solid var(--border);
  box-shadow: 0 -6px 24px rgba(23, 50, 74, .10);
  transform: translateY(100%); transition: transform .35s var(--ease);
}
.mobile-bar.show { transform: none; }
.mobile-bar-call, .mobile-bar-wechat {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 0; font-size: 15px; font-weight: 700; background: #fff; color: var(--brand-dark);
}
.mobile-bar-call svg { color: var(--brand); }
.mobile-bar-wechat { background: var(--brand-grad); color: #fff; }

/* ============ 二维码弹层 ============ */

.qr-modal { position: fixed; inset: 0; z-index: 2000; display: grid; place-items: center; padding: 20px; }
.qr-modal[hidden] { display: none; }
.qr-modal-mask { position: absolute; inset: 0; background: rgba(23, 50, 74, .55); backdrop-filter: blur(4px); }
.qr-modal-body {
  position: relative; background: #fff; border-radius: 20px; padding: 24px;
  text-align: center; box-shadow: 0 24px 60px rgba(23,50,74,.3);
  animation: modalIn .3s var(--ease); max-height: 88vh; overflow-y: auto;
}
@keyframes modalIn { from { opacity: 0; transform: scale(.92) translateY(10px); } to { opacity: 1; transform: none; } }
.qr-modal-body img {
  width: min(280px, 62vw); height: auto; border-radius: 12px; margin: 0 auto 18px;
  border: 1px solid var(--border);
}
.qr-modal-title { font-size: 17px; font-weight: 700; }
.qr-modal-sub { font-size: 13px; color: var(--text-3); margin-top: 6px; }
.qr-modal-close {
  position: absolute; top: -14px; right: -14px;
  width: 36px; height: 36px; border-radius: 50%;
  background: #fff; color: var(--text); font-size: 22px; line-height: 1;
  box-shadow: var(--shadow-md); display: grid; place-items: center;
  transition: transform .2s, color .2s;
}
.qr-modal-close:hover { transform: rotate(90deg); color: var(--brand); }

/* ============================================================
   自适应断点
   ============================================================ */

/* 1200px 以下：收紧导航间距，保证一行不换行 */
@media (max-width: 1199px) {
  .container { padding: 0 20px; }
  .nav-link { padding: 8px 10px; font-size: 14.5px; }
  .brand-logo { height: 40px; }
  .header-actions { gap: 10px; }
  .header-phone { font-size: 15px; }
  .hero-inner { gap: 40px; }
  .about-grid { gap: 40px; }
  .services-grid, .adv-grid, .process-grid { gap: 18px; }
  .contact-card { padding: 48px 40px; }
}

/* 1080px 以下：导航收进汉堡菜单 */
@media (max-width: 1080px) {
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg); padding: 12px 20px 20px;
    transform: translateY(-12px); opacity: 0; visibility: hidden; pointer-events: none;
    transition: .3s var(--ease); max-height: calc(100vh - var(--header-h)); overflow-y: auto;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; pointer-events: auto; }
  .nav-link { padding: 13px 10px; font-size: 16px; border-bottom: 1px solid var(--bg-soft); }
  .nav-link::after { display: none; }
  .mobile-only { display: flex; }
  .nav-phone { justify-content: center; border-bottom: none !important; margin-top: 10px; }
  .nav-cta { margin-top: 6px; }

  .hero-inner { grid-template-columns: 1fr; gap: 44px; text-align: center; }
  .hero-content { max-width: 640px; margin: 0 auto; }
  .hero-cta, .hero-points { justify-content: center; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* 992px 以下：三列变两列 */
@media (max-width: 991px) {
  :root { --header-h: 68px; }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 44px; }
  .services-grid, .adv-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: 1fr; }
  .hero { padding-top: calc(var(--header-h) + 48px); padding-bottom: 76px; }
  .contact-card { padding: 40px 32px; }
}

/* 768px 以下：手机端单列 */
@media (max-width: 767px) {
  body { font-size: 15px; }
  :root { --header-h: 62px; }
  .container { padding: 0 16px; }
  .section { padding: 58px 0 64px; }
  .section-head { margin-bottom: 34px; }
  .brand-logo { height: 34px; }
  .brand-icon { height: 32px; }

  .header-actions .btn { display: none; }
  .header-phone { display: none; }
  .menu-toggle { display: flex; }

  .hero { padding-top: calc(var(--header-h) + 36px); padding-bottom: 64px; }
  .hero-title { letter-spacing: -.5px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn-lg { padding: 13px 22px; font-size: 15px; }
  .hero-points { gap: 10px 16px; }
  .hero-points li { font-size: 14px; }
  .scroll-down { display: none; }

  .services-grid, .adv-grid, .process-grid, .cases-grid { grid-template-columns: 1fr; }
  .qr-img-box { width: 174px; }
  .qr-card-lg .qr-img-box { width: 200px; }
  .contact-card { padding: 32px 20px; border-radius: 18px; }
  .contact-list li { grid-template-columns: 1fr; gap: 2px; }
  .case-row { grid-template-columns: 66px 1fr; gap: 10px; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-nav { flex-direction: row; flex-wrap: wrap; gap: 8px 18px; }
  .footer-bottom { font-size: 12.5px; }

  .mobile-bar { display: grid; }
  body { padding-bottom: 53px; }
}

/* 400px 以下：超窄屏微调 */
@media (max-width: 400px) {
  .container { padding: 0 14px; }
  .hero-tag { font-size: 12.5px; padding: 6px 12px; }
  .service-card, .adv-item, .process-step, .case-card { padding: 24px 18px; }
  .section-tag { font-size: 12px; letter-spacing: .12em; }
  .mobile-bar-call span, .mobile-bar-wechat span { font-size: 14px; }
}