/* =========================================================
   天斧网 · 官网样式（洲宇风格 v3 · BIM 单业务线）
   白底大留白 + 项目大图 + 极简克制；藏青主色 + 青强调；无橙色
   移动优先 · 断点 375 / 768 / 1280 · WCAG AA
   ========================================================= */

:root {
  /* ── 藏青主色阶梯 900→50 ── */
  --brand-900: #08192B;
  --brand-800: #0F2A43;
  --brand-700: #163D5C;
  --brand-600: #1B3F63;
  --brand-500: #2A557F;
  --brand-400: #4E759B;
  --brand-300: #8AA6C0;
  --brand-200: #C2D2E1;
  --brand-100: #E3EBF2;
  --brand-50:  #F2F6FA;

  /* ── 青强调色 深→浅（BIM）── */
  --bim-900: #075A66;
  --bim-800: #0B7E8E;
  --bim-700: #0E9DB0;
  --bim-600: #35B2C2;
  --bim-500: #61C6D3;
  --bim-300: #AEE2E9;
  --bim-100: #EAF9FB;
  --bim-50:  #F4FCFD;

  /* ── 中性 ── */
  --white: #FFFFFF;
  --gray-50: #FAFBFC;  --gray-100: #F4F6F8; --gray-200: #E8EBEF;
  --gray-300: #D7DCE2; --gray-400: #AEB6C0; --gray-500: #828B96;
  --gray-600: #5A626C; --gray-700: #3A414A; --gray-800: #262B31;
  --text: #1B2025;
  --text-muted: #5A626C;
  --border: #E4E8ED;
  --border-strong: #CBD2DA;

  /* ── 语义（表单/链接/CTA）── */
  --link: var(--bim-900);
  --link-hover: var(--bim-800);
  --cta-bg: var(--bim-800);
  --cta-bg-hover: var(--bim-900);
  --cta-text: #FFFFFF;
  --success: #1B7E4F;  --success-bg: #E6F4EE;
  --danger: #C0392B;   --danger-bg: #FBEDEB;
  --focus: var(--bim-800);

  /* ── 字体 ── */
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-num: "Inter", system-ui, sans-serif;
  --fw-regular: 400; --fw-medium: 500; --fw-semibold: 600; --fw-bold: 700;
  --fs-hero: clamp(32px, 6vw, 56px);
  --fs-h2: clamp(26px, 4vw, 40px);
  --fs-h3: clamp(18px, 2.5vw, 22px);
  --fs-body: 16px;
  --fs-sm: 14px;
  --fs-xs: 12px;
  --fs-stat: clamp(28px, 5vw, 44px);

  /* ── 间距（8px 基准）── */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --space-9: 96px; --space-10: 128px;
  --section-py: clamp(48px, 8vw, 96px);
  --container-max: 1280px;
  --container-pad: 24px;

  /* ── 圆角 / 阴影 / 描边 ── */
  --radius-sm: 6px;  --radius-md: 10px; --radius-lg: 16px; --radius-pill: 999px;
  --border-w: 1px;
  --shadow-sm: 0 1px 2px rgba(15,42,67,.06), 0 1px 3px rgba(15,42,67,.04);
  --shadow-hover: 0 6px 16px rgba(15,42,67,.08);
}

/* 断点间距升级 */
@media (min-width: 768px) { :root { --container-pad: 40px; } }
@media (min-width: 1280px) { :root { --container-pad: 64px; } }

/* =========================================================
   基础重置
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: var(--radius-sm); }

.skip-link {
  position: absolute; left: var(--space-4); top: -60px;
  background: var(--brand-800); color: #fff; padding: 10px 16px;
  border-radius: var(--radius-md); z-index: 200; transition: top .2s ease;
}
.skip-link:focus { top: var(--space-2); }

.container { width: 100%; max-width: var(--container-max); margin-inline: auto; padding-inline: var(--container-pad); }
.section { padding-block: var(--section-py); }
.section:nth-of-type(even) { background: var(--gray-50); }

/* =========================================================
   排版工具
   ========================================================= */
.eyebrow {
  display: inline-block; font-size: var(--fs-xs); font-weight: var(--fw-semibold);
  letter-spacing: .08em; color: var(--bim-900); background: var(--bim-100);
  padding: 4px 12px; border-radius: var(--radius-pill); margin-bottom: var(--space-3);
}
.sec-title { font-size: var(--fs-h2); line-height: 1.22; color: var(--brand-800); font-weight: var(--fw-bold); letter-spacing: -.01em; margin-bottom: var(--space-3); }
.sec-sub { font-size: var(--fs-body); color: var(--text-muted); max-width: 62ch; }
.sec-head { margin-bottom: var(--space-7); }
.note { font-size: var(--fs-sm); color: var(--gray-500); margin-top: var(--space-4); }

.logo-mark {
  width: 38px; height: 38px; border-radius: var(--radius-md); flex: none;
  background: linear-gradient(135deg, var(--brand-600), var(--brand-900));
  color: #fff; font-weight: var(--fw-bold); font-size: 20px;
  display: grid; place-items: center;
}

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  height: 46px; padding-inline: var(--space-6);
  font-weight: var(--fw-semibold); font-size: var(--fs-body);
  border-radius: var(--radius-md); border: var(--border-w) solid transparent;
  background: none; color: inherit; white-space: nowrap;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn--cta { background: var(--cta-bg); color: var(--cta-text); }
.btn--cta:hover { background: var(--cta-bg-hover); transform: translateY(-1px); }
.btn--ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.5); }
.btn--ghost:hover { background: rgba(255,255,255,.22); }
.btn--block { width: 100%; }

/* =========================================================
   导航 Nav（洲宇式极简）
   ========================================================= */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(8px); -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: var(--border-w) solid var(--border);
}
.site-nav__inner { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-pad); height: 64px; display: flex; align-items: center; gap: var(--space-5); }
.site-nav__brand { display: flex; align-items: center; gap: var(--space-2); font-weight: var(--fw-bold); color: var(--brand-800); font-size: 18px; letter-spacing: .5px; }
.site-nav__links { display: none; gap: var(--space-6); margin-left: auto; }
.site-nav__link { color: var(--text); font-size: 15px; font-weight: var(--fw-medium); padding-block: 6px; position: relative; transition: color .2s ease; }
.site-nav__link::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--brand-700); transform: scaleX(0); transform-origin: left; transition: transform .25s ease; }
.site-nav__link:hover, .site-nav__link[aria-current="page"] { color: var(--brand-700); }
.site-nav__link:hover::after, .site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__cta { display: none; margin-left: var(--space-2); }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; margin-left: auto; background: none; border: 0; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); display: block; transition: .25s ease; }
.site-nav.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
.site-nav.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero（全幅大图 + 叠加文案）
   ========================================================= */
.hero { position: relative; isolation: isolate; overflow: hidden; height: 70vh; min-height: 480px; }
.hero__slides { position: relative; width: 100%; height: 100%; }
.hero__slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1s ease; z-index: 0; }
.hero__slide.is-active { opacity: 1; z-index: 1; }
.hero__media { width: 100%; height: 100%; object-fit: cover; }
.hero__scrim { position: absolute; inset: 0; background: linear-gradient(0deg, rgba(8,25,43,.92), rgba(8,25,43,.25)); z-index: 2; pointer-events: none; }
.hero__content { position: absolute; left: var(--container-pad); right: var(--container-pad); bottom: var(--space-6); max-width: 680px; color: #fff; z-index: 3; }
.hero__eyebrow { display: inline-block; font-size: var(--fs-xs); font-weight: var(--fw-semibold); letter-spacing: .12em; color: var(--bim-300); margin-bottom: var(--space-3); }
.hero__title { font-size: var(--fs-hero); font-weight: var(--fw-bold); line-height: 1.12; letter-spacing: -.01em; }
.hero__sub { font-size: var(--fs-body); color: rgba(255,255,255,.86); margin: var(--space-4) 0 var(--space-6); max-width: 52ch; }
.hero__cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* Hero 轮播箭头 */
.hero__arrow { position: absolute; top: 50%; transform: translateY(-50%); z-index: 4;
  width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(255,255,255,.15); color: #fff;
  display: grid; place-items: center; cursor: pointer; backdrop-filter: blur(4px);
  transition: background .2s ease, transform .2s ease; }
.hero__arrow:hover { background: rgba(255,255,255,.28); }
.hero__arrow:active { transform: translateY(-50%) scale(.95); }
.hero__arrow--prev { left: var(--space-4); }
.hero__arrow--next { right: var(--space-4); }

/* Hero 轮播指示点 */
.hero__dots { position: absolute; left: 50%; bottom: var(--space-4); transform: translateX(-50%); z-index: 4;
  display: flex; gap: var(--space-2); }
.hero__dot { width: 10px; height: 10px; border-radius: 50%; border: 0; padding: 0; cursor: pointer;
  background: rgba(255,255,255,.4); transition: background .2s ease, transform .2s ease; }
.hero__dot.is-active { background: #fff; transform: scale(1.2); }
.hero__dot:hover { background: rgba(255,255,255,.75); }

/* =========================================================
   占位图 .ph
   ========================================================= */
.ph { position: relative; display: grid; place-items: center; overflow: hidden;
  background: linear-gradient(135deg, var(--brand-700), var(--bim-800));
  color: rgba(255,255,255,.9); }
.ph::after { content: attr(data-ph); font-size: var(--fs-xs); letter-spacing: .08em; }
.ph--hero { aspect-ratio: 4/3; }
.ph--case { aspect-ratio: 4/3; }
/* 真实图片兼容：把 .ph 占位节点替换为 <img class="...__media" src="..." alt="..."> 即自动填满容器 */
.hero__media { width: 100%; object-fit: cover; }

/* =========================================================
   关于 About
   ========================================================= */
.about__grid { display: grid; gap: var(--space-7); align-items: start; }
.about__side { display: grid; gap: var(--space-6); }
.stat-bar { display: flex; flex-wrap: wrap; gap: var(--space-5); }
.stat { flex: 1 1 40%; }
.stat__num { font: 700 var(--fs-stat)/1.1 var(--font-num); color: var(--brand-800); }
.stat__label { font-size: var(--fs-sm); color: var(--text-muted); margin-top: var(--space-2); }
.facts { display: grid; gap: var(--space-3); }
.facts li { background: #fff; border: var(--border-w) solid var(--border); border-radius: var(--radius-md); padding: var(--space-3) var(--space-4); display: flex; justify-content: space-between; gap: var(--space-3); font-size: var(--fs-sm); }
.facts li b { color: var(--brand-600); font-weight: var(--fw-semibold); flex: none; }
.facts li span { color: var(--text-muted); text-align: right; }

/* =========================================================
   业务领域 · 洲宇风格全屏图卡
   ========================================================= */
.biz-panels {
  display: flex;
  gap: var(--space-3);
  height: 480px;
}
.biz-panel {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  border: none;
  padding: 0;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  background: var(--brand-800);
  text-align: left;
  transition: flex .55s cubic-bezier(.4, 0, .2, 1);
  -webkit-tap-highlight-color: transparent;
}
.biz-panel__bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform .6s ease, filter .55s ease;
}
.biz-panel__bg--anim { width: 100%; height: 100%; display: block; }
.biz-panel__bg--ph {
  background:
    radial-gradient(120% 120% at 18% 8%, rgba(14, 157, 176, .50), transparent 60%),
    linear-gradient(155deg, var(--bim-700), var(--brand-900));
}
.biz-panel__shade {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8, 25, 43, .08) 0%, rgba(8, 25, 43, .50) 52%, rgba(8, 25, 43, .92) 100%);
  transition: background .55s ease;
}
.biz-panel__tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-size: var(--fs-xs); font-weight: var(--fw-semibold);
  letter-spacing: .06em; color: #fff;
  background: rgba(255, 255, 255, .18);
  border: 1px solid rgba(255, 255, 255, .35);
  padding: 3px 10px; border-radius: var(--radius-pill);
  backdrop-filter: blur(4px);
}
.biz-panel__index {
  position: absolute; top: 14px; right: 18px; z-index: 2;
  font-size: 28px; font-weight: 700; line-height: 1;
  color: rgba(255, 255, 255, .55);
  font-feature-settings: "tnum";
}
.biz-panel__body {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: var(--space-5);
  color: #fff;
}
.biz-panel__title {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  margin: 0;
  color: #fff;
  letter-spacing: .01em;
  text-shadow: 0 1px 8px rgba(0, 0, 0, .35);
}
/* 收起态：仅露标题，描述与按钮淡出收起 */
.biz-panel__desc,
.biz-panel__more {
  opacity: 0;
  transform: translateY(8px);
  max-height: 0;
  overflow: hidden;
  transition: opacity .4s ease, transform .4s ease, max-height .4s ease;
}
.biz-panel__desc {
  font-size: var(--fs-sm);
  line-height: 1.7;
  margin: var(--space-3) 0 0;
  color: rgba(255, 255, 255, .82);
}
.biz-panel__more {
  display: inline-block;
  margin-top: var(--space-4);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--bim-200);
}
.biz-panel__more i { font-style: normal; display: inline-block; transition: transform .3s ease; }

/* 悬停展开：当前卡放大，其余压暗 */
.biz-panels:hover .biz-panel { flex: 1 1 0; }
.biz-panels .biz-panel:hover { flex: 2.6 1 0; }
.biz-panels:hover .biz-panel:not(:hover) .biz-panel__bg { filter: brightness(.58); }
.biz-panels:hover .biz-panel:not(:hover) .biz-panel__shade {
  background: linear-gradient(180deg, rgba(8, 25, 43, .42), rgba(8, 25, 43, .86));
}
.biz-panels .biz-panel:hover .biz-panel__bg { transform: scale(1.06); }
.biz-panels .biz-panel:hover .biz-panel__desc,
.biz-panels .biz-panel:hover .biz-panel__more {
  opacity: 1; transform: translateY(0); max-height: 260px;
}
.biz-panels .biz-panel:hover .biz-panel__more i { transform: translateX(4px); }

/* 详情弹窗 —— 全屏大图，文字压在图片上（洲宇详情页风格） */
.biz-modal {
  position: fixed; inset: 0; z-index: 1000;
}
.biz-modal[hidden] { display: none; }
.biz-modal__backdrop { position: absolute; inset: 0; background: #000; }
.biz-modal__dialog {
  position: relative; z-index: 1;
  width: 100%; height: 100%; max-width: none; max-height: none;
  background: #000; border-radius: 0; overflow: hidden;
  animation: bizPop .35s ease;
}
@keyframes bizPop {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: none; }
}
.biz-modal__media {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
}
.biz-modal__canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.biz-modal__media--ph { background: linear-gradient(155deg, var(--bim-700), var(--brand-900)); }
.biz-modal__media--video {
  display: flex; align-items: center; justify-content: center;
  background: #000;
}
.biz-modal__media--video video {
  width: 100%; height: 100%;
  object-fit: contain;
  background: #000;
}
.biz-modal__content {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: min(580px, 46%);
  padding: var(--space-8) var(--space-7) var(--space-7);
  display: flex; flex-direction: column; justify-content: flex-start;
  color: #fff;
  background: linear-gradient(90deg, rgba(8, 25, 43, .94) 0%, rgba(8, 25, 43, .72) 78%, transparent 100%);
  overflow-y: auto;
}
.biz-modal__kicker {
  font-size: var(--fs-xs); font-weight: var(--fw-semibold);
  letter-spacing: .12em; color: var(--bim-300); text-transform: uppercase;
}
.biz-modal__title {
  font-size: var(--fs-h2); font-weight: var(--fw-bold);
  color: #fff; margin: var(--space-2) 0 var(--space-4);
  text-shadow: 0 2px 10px rgba(0, 0, 0, .35);
}
.biz-modal__desc {
  font-size: var(--fs-sm); color: rgba(255, 255, 255, .82);
  line-height: 1.8; margin-bottom: var(--space-4);
}
.biz-modal__points { display: grid; gap: 8px; margin-bottom: var(--space-5); }
.biz-modal__points li {
  font-size: var(--fs-sm); color: rgba(255, 255, 255, .9);
  padding-left: 20px; position: relative; line-height: 1.6;
}
.biz-modal__points li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 7px; height: 7px; border-radius: 50%; background: var(--bim-300);
}
.biz-modal__detail {
  font-size: var(--fs-sm); color: rgba(255, 255, 255, .86); line-height: 1.9;
  padding-top: var(--space-4); border-top: 1px solid rgba(255, 255, 255, .18);
  margin-bottom: var(--space-6);
}
.biz-modal__close {
  position: absolute; top: 18px; right: 18px; z-index: 3;
  width: 44px; height: 44px; border-radius: 50%;
  border: none; cursor: pointer;
  background: rgba(255, 255, 255, .92); color: var(--brand-800);
  font-size: 24px; line-height: 1; display: grid; place-items: center;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .25);
  transition: background .2s ease, transform .2s ease;
}
.biz-modal__close:hover { background: #fff; transform: rotate(90deg); }
.biz-modal__cta { align-self: flex-start; }

/* 移动端：竖排卡片 + 弹窗底部浮层 */
@media (max-width: 860px) {
  .biz-panels { flex-direction: column; height: auto; gap: var(--space-4); }
  .biz-panel { height: 200px; }
  .biz-panel__desc, .biz-panel__more { opacity: 1; transform: none; max-height: 260px; }
  .biz-panels:hover .biz-panel:not(:hover) .biz-panel__bg { filter: none; }
  .biz-panel__index { font-size: 22px; }
  .biz-modal__content {
    width: 100%; top: auto; left: 0; right: 0; bottom: 0;
    max-height: 72vh; padding: var(--space-7) var(--space-5) var(--space-5);
    justify-content: flex-end;
    background: linear-gradient(0deg, rgba(8, 25, 43, .96) 0%, rgba(8, 25, 43, .80) 60%, transparent 100%);
  }
  .biz-modal__close { top: 12px; right: 12px; }
}

.value-strip { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); margin-top: var(--space-7); padding: var(--space-5); background: var(--brand-50); border: var(--border-w) solid var(--brand-100); border-radius: var(--radius-lg); }
.value-strip__item { display: flex; align-items: baseline; gap: 8px; font-size: var(--fs-sm); color: var(--brand-700); }
.value-strip__item span { font-weight: var(--fw-bold); color: var(--bim-800); }

/* =========================================================
   项目案例：全屏不规则拼贴画廊轮播（无标题/无筛选）
   每屏 3 项：左侧大图跨两行，右侧上下两张横图；
   不足 3 项时优雅降级（1 项全屏、2 项左右均分）
   ========================================================= */
#cases { padding: 0 clamp(48px, 11vw, 160px); min-height: 100vh; }
#cases .case-wall--full { margin: 0; height: 100vh; min-height: 600px; }
.case-wall { position: relative; }
.case-wall__viewport { overflow: hidden; height: 100%; border-radius: var(--radius-lg); }
.case-wall__track { display: flex; height: 100%; transition: transform .7s cubic-bezier(.22, 1, .36, 1); }
.case-wall__page { flex: 0 0 100%; display: grid; gap: var(--space-3); height: 100%; min-height: 420px; }
/* 3 项拼贴：仅左右镜像两种模板（左侧大图 / 右侧大图），由 JS 随机切换 */
.case-wall__page--3 { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.case-wall__page--left  { grid-template-areas: "big wide1" "big wide2"; }
.case-wall__page--right { grid-template-areas: "wide1 big" "wide2 big"; }
.case-wall__page--3 .case-wall__slide:nth-child(1) { grid-area: big; }
.case-wall__page--3 .case-wall__slide:nth-child(2) { grid-area: wide1; }
.case-wall__page--3 .case-wall__slide:nth-child(3) { grid-area: wide2; }
/* 2 项：左右各一，均跨两行 */
.case-wall__page--2 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
}
.case-wall__page--2 .case-wall__slide { grid-row: 1 / 3; }
/* 1 项：铺满整屏 */
.case-wall__page--1 {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
}
.case-wall__page--1 .case-wall__slide { grid-row: 1 / 3; grid-column: 1; }
.case-wall__slide { position: relative; overflow: hidden; border-radius: var(--radius-md); cursor: pointer; background: linear-gradient(135deg, var(--bim-50), var(--brand-50)); }
.case-wall__slide:hover .case-wall__cover { transform: scale(1.05); }
.case-wall__slide[hidden] { display: none; }
.case-wall__cover, .case-wall__cover.ph { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; background: linear-gradient(135deg, var(--bim-50), var(--brand-50)); transition: transform .7s cubic-bezier(.22, 1, .36, 1); }
.case-wall__overlay { position: absolute; left: 0; right: 0; bottom: 0; padding: var(--space-5); background: linear-gradient(0deg, rgba(8, 25, 43, .92), transparent 70%); color: #fff; z-index: 2; }
.case-wall__title { font-weight: var(--fw-semibold); font-size: var(--fs-h3); }
.case-wall__tag { font-size: var(--fs-xs); color: var(--bim-300); margin-top: 4px; letter-spacing: .04em; }
.case-wall__desc { font-size: var(--fs-sm); color: rgba(255, 255, 255, .82); margin-top: 8px; line-height: 1.6; max-width: 520px; }
.case-wall__play { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 3; width: 64px; height: 64px; border-radius: 50%; background: rgba(255, 255, 255, .95); color: var(--brand-800); display: grid; place-items: center; font-size: 24px; box-shadow: 0 6px 24px rgba(0, 0, 0, .3); }
.case-wall__badge { position: absolute; top: 16px; left: 16px; z-index: 3; font-size: var(--fs-xs); font-weight: var(--fw-semibold); letter-spacing: .06em; color: #fff; background: var(--bim-800); padding: 4px 12px; border-radius: var(--radius-pill); }
.case-wall__arrow { position: absolute; top: 50%; transform: translateY(-50%); z-index: 5; width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer; background: rgba(255, 255, 255, .92); color: var(--brand-800); font-size: 28px; line-height: 1; display: grid; place-items: center; box-shadow: 0 4px 14px rgba(0, 0, 0, .2); transition: background .2s ease, opacity .2s ease; }
.case-wall__arrow:hover { background: #fff; }
.case-wall__arrow--prev { left: -24px; }
.case-wall__arrow--next { right: -24px; }
.case-wall__arrow[disabled] { opacity: .35; cursor: default; }
.case-wall__dots { display: flex; gap: 10px; justify-content: center; margin-top: var(--space-5); }
.case-wall__dot { width: 10px; height: 10px; border-radius: 50%; border: none; cursor: pointer; padding: 0; background: rgba(8, 25, 43, .25); transition: background .2s ease, transform .2s ease; }
.case-wall__dot.is-active { background: var(--bim-800); transform: scale(1.25); }

/* 轮播进入动效 */
.case-wall__page { animation: casePageIn .7s ease; }
@keyframes casePageIn {
  from { opacity: .6; transform: scale(.98); }
  to { opacity: 1; transform: scale(1); }
}

/* 滚动揭示动画 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

@media (max-width: 860px) {
  #cases { padding: 0 var(--space-4); min-height: auto; }
  #cases .case-wall--full { height: auto; min-height: auto; }
  .case-wall__viewport { border-radius: var(--radius-md); }
  .case-wall__slide { height: 48vh; min-height: 280px; border-radius: var(--radius-sm); }
  .case-wall__arrow { width: 40px; height: 40px; font-size: 22px; }
  .case-wall__arrow--prev { left: 10px; }
  .case-wall__arrow--next { right: 10px; }
  .case-wall__overlay { padding: var(--space-4); }
  .case-wall__title { font-size: 16px; }
  .case-wall__desc { font-size: var(--fs-xs); }
}

/* 案例灯箱（全屏沉浸） */
.case-lightbox { position: fixed; inset: 0; z-index: 1100; }
.case-lightbox[hidden] { display: none; }
.case-lightbox__backdrop { position: absolute; inset: 0; background: #000; }
.case-lightbox__stage { position: absolute; inset: 0; display: grid; place-items: center; }
.case-lightbox__close { position: absolute; top: 18px; right: 18px; z-index: 3; width: 44px; height: 44px; border-radius: 50%; border: none; cursor: pointer; background: rgba(255, 255, 255, .92); color: var(--brand-800); font-size: 24px; line-height: 1; display: grid; place-items: center; box-shadow: 0 2px 12px rgba(0, 0, 0, .25); transition: background .2s ease, transform .2s ease; }
.case-lightbox__close:hover { background: #fff; transform: rotate(90deg); }

/* 公众号二维码弹窗 + 导航/联系入口 */
.site-nav__wx {
  margin-left: var(--space-2);
  white-space: nowrap;
}
@media (min-width: 768px) { .site-nav__wx { margin-left: var(--space-3); } }

.site-footer__qr {
  display: block; width: 108px; height: 108px; padding: 6px; margin-top: 12px;
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  cursor: pointer; transition: transform .2s ease, box-shadow .2s ease;
}
.site-footer__qr:hover { transform: translateY(-3px); box-shadow: 0 10px 24px -10px rgba(0,0,0,.25); }
.site-footer__qr img { width: 100%; height: 100%; object-fit: contain; display: block; border-radius: 6px; }
.site-footer__qr-name { margin: 10px 0 0; font-size: 13px; color: #64748b; line-height: 1.5; }

.qr-pop { position: fixed; inset: 0; z-index: 1200; }
.qr-pop[hidden] { display: none; }
.qr-pop__backdrop { position: absolute; inset: 0; background: rgba(8,25,43,.62); -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px); }
.qr-pop__dialog { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: min(340px, 88vw); background: #fff; border-radius: 18px; padding: 26px 24px 22px; text-align: center; box-shadow: 0 30px 70px -20px rgba(0,0,0,.5); animation: qrIn .25s ease; }
@keyframes qrIn { from { opacity: 0; transform: translate(-50%, -46%) scale(.96); } to { opacity: 1; transform: translate(-50%, -50%) scale(1); } }
.qr-pop__close { position: absolute; top: 10px; right: 12px; width: 34px; height: 34px; border: none; border-radius: 50%; background: #f1f5f9; color: #475569; font-size: 22px; line-height: 1; cursor: pointer; display: grid; place-items: center; transition: background .2s ease; }
.qr-pop__close:hover { background: #e2e8f0; }
.qr-pop__img { width: 220px; height: 220px; object-fit: contain; border-radius: 12px; background: #f8fafc; margin: 6px auto 0; display: block; }
.qr-pop__name { margin: 14px 0 4px; font-size: 16px; font-weight: var(--fw-bold); color: var(--brand-800); }
.qr-pop__desc { margin: 0; font-size: 13px; color: #64748b; line-height: 1.6; }

/* 照片轮播（炫酷淡入 + 缓慢推近） */
.case-gallery { position: absolute; inset: 0; }
.case-gallery__track { position: absolute; inset: 0; }
.case-slide { position: absolute; inset: 0; margin: 0; opacity: 0; transform: scale(1.08); transition: opacity .8s ease, transform 1.2s ease; }
.case-slide.is-active { opacity: 1; transform: scale(1); }
.case-slide img { width: 100%; height: 100%; object-fit: cover; display: block; }
.case-gallery__arrow { position: absolute; top: 50%; transform: translateY(-50%); z-index: 2; width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer; background: rgba(8, 25, 43, .5); color: #fff; font-size: 26px; line-height: 1; display: grid; place-items: center; -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); transition: background .2s ease; }
.case-gallery__arrow:hover { background: rgba(8, 25, 43, .8); }
.case-gallery__arrow.prev { left: 18px; }
.case-gallery__arrow.next { right: 18px; }
.case-gallery__dots { position: absolute; left: 0; right: 0; bottom: 72px; z-index: 2; display: flex; gap: 10px; justify-content: center; }
.case-dot { width: 10px; height: 10px; border-radius: 50%; border: none; cursor: pointer; padding: 0; background: rgba(255, 255, 255, .4); transition: background .2s ease, transform .2s ease; }
.case-dot.is-active { background: #fff; transform: scale(1.25); }
.case-gallery__cap { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 64px var(--space-6) var(--space-6); background: linear-gradient(0deg, rgba(8, 25, 43, .82), rgba(8, 25, 43, .35) 50%, transparent); color: #fff; pointer-events: none; }
.case-gallery__title { display: block; font-size: var(--fs-h2); font-weight: var(--fw-bold); text-shadow: 0 2px 10px rgba(0, 0, 0, .4); }
.case-gallery__desc { display: block; font-size: var(--fs-sm); color: rgba(255, 255, 255, .86); margin-top: 8px; max-width: 720px; line-height: 1.7; }

/* 视频播放 */
.case-video { position: absolute; inset: 0; display: grid; place-items: center; background: #000; }
.case-video video { width: 100%; height: 100%; object-fit: contain; }
.case-video__cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 64px var(--space-6) var(--space-6); background: linear-gradient(0deg, rgba(8, 25, 43, .82), rgba(8, 25, 43, .35) 50%, transparent); color: #fff; font-size: var(--fs-sm); line-height: 1.7; pointer-events: none; }

/* 占位提示 */
.case-stage__ph { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: var(--space-6); color: rgba(255, 255, 255, .85); background: linear-gradient(135deg, var(--bim-800), var(--brand-900)); font-size: var(--fs-h3); }
.case-stage__ph small { display: block; margin-top: 10px; font-size: var(--fs-sm); color: rgba(255, 255, 255, .6); line-height: 1.6; }

@media (max-width: 860px) {
  .case-gallery__cap { padding: var(--space-4); }
  .case-gallery__dots { bottom: 64px; }
}

/* =========================================================
   服务流程 Process（高科技卡片流程）
   ========================================================= */
.process__track { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-5); }
.process__node {
  position: relative; padding: var(--space-5) var(--space-4) var(--space-6);
  background: linear-gradient(155deg, rgba(255,255,255,.82), rgba(234,249,251,.5));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.process__node::before {
  content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--bim-900), var(--bim-500)); opacity: .9;
}
.process__node:hover { transform: translateY(-6px); border-color: var(--bim-600); box-shadow: 0 20px 44px -20px rgba(14,157,176,.5); }
.process__dot {
  width: 58px; height: 58px; border-radius: 16px; display: grid; place-items: center;
  background: radial-gradient(circle at 30% 25%, var(--bim-500), var(--bim-800));
  box-shadow: 0 0 0 6px rgba(14,157,176,.12), 0 12px 26px -12px rgba(14,157,176,.6);
  margin-bottom: var(--space-4);
}
.process__step { font: 700 20px/1 var(--font-num); color: #fff; letter-spacing: .02em; }
.process__title { font-size: var(--fs-h3); color: var(--brand-800); font-weight: var(--fw-bold); margin: 0 0 var(--space-2); }
.process__desc { font-size: var(--fs-sm); color: var(--text-muted); line-height: 1.75; margin: 0; }

/* =========================================================
   下载软件 Software
   ========================================================= */
.software-grid { display: grid; gap: var(--space-5); grid-template-columns: 1fr; }
@media (min-width: 768px) { .software-grid { grid-template-columns: 1fr 1fr; } }

.soft-card {
  display: flex; gap: var(--space-4); align-items: flex-start;
  background: #fff; border: var(--border-w) solid var(--border);
  border-radius: var(--radius-lg); padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.soft-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: var(--brand-100); }
@media (prefers-reduced-motion: reduce) { .soft-card:hover { transform: none; } }

.soft-card__icon {
  flex: 0 0 auto; width: 52px; height: 52px; border-radius: var(--radius-md);
  background: var(--brand-50); color: var(--bim-700);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.soft-card__icon img { width: 100%; height: 100%; object-fit: cover; }
.soft-card__icon--ph svg { width: 26px; height: 26px; }

.soft-card__main { flex: 1 1 auto; min-width: 0; }
.soft-card__head { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.soft-card__name { font-size: var(--fs-h3); font-weight: var(--fw-semibold); color: var(--brand-800); margin: 0; }
.soft-card__ver {
  font-size: var(--fs-xs); font-weight: var(--fw-semibold); color: var(--bim-700);
  background: var(--bim-50); border: var(--border-w) solid var(--bim-100);
  padding: 2px 10px; border-radius: var(--radius-pill);
}
.soft-card__desc { font-size: var(--fs-sm); color: var(--text-muted); line-height: 1.7; margin: var(--space-2) 0 var(--space-3); }
.soft-card__meta { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); font-size: var(--fs-xs); color: var(--text-muted); }

.soft-card__btn { align-self: center; flex: 0 0 auto; text-decoration: none; }
.soft-card__btn--off {
  color: var(--text-muted); background: var(--gray-50);
  border: var(--border-w) dashed var(--border);
  padding: 0 var(--space-5); height: 44px; line-height: 44px;
  border-radius: var(--radius-md); font-size: var(--fs-sm); font-weight: var(--fw-semibold);
}

/* =========================================================
   联系 Contact + 表单
   ========================================================= */
.contact__grid { display: grid; gap: var(--space-8); align-items: start; }
.contact__info { display: grid; gap: var(--space-3); margin-top: var(--space-5); }
.contact__info li { display: flex; gap: var(--space-2); font-size: var(--fs-sm); color: var(--text-muted); }
.contact__info li b { color: var(--brand-600); min-width: 48px; flex: none; }
.contact__qr { margin-top: var(--space-6); }
.contact__qr-title { font-size: var(--fs-sm); font-weight: var(--fw-semibold); color: var(--text); margin-bottom: var(--space-3); }
.contact__qr-img {
  display: block; width: 160px; height: 160px; padding: 8px;
  background: #fff; border: var(--border-w) solid var(--border); border-radius: var(--radius-md);
  cursor: pointer; transition: transform .2s ease, box-shadow .2s ease;
}
.contact__qr-img:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.contact__qr-img img { width: 100%; height: 100%; object-fit: contain; border-radius: 6px; }
.contact__qr-desc { margin-top: var(--space-3); font-size: var(--fs-xs); color: var(--text-muted); line-height: 1.6; max-width: 200px; }
.form { display: grid; gap: var(--space-4); background: #fff; border: var(--border-w) solid var(--border); border-radius: var(--radius-lg); padding: var(--space-6); }
.field { display: grid; gap: 6px; }
.field label { font-size: var(--fs-sm); font-weight: var(--fw-semibold); color: var(--text); }
.field input, .field select, .field textarea {
  font: inherit; width: 100%; height: 46px; padding: 0 var(--space-4);
  border: var(--border-w) solid var(--border-strong); border-radius: var(--radius-sm);
  background: #fff; color: var(--text); transition: border-color .2s ease, box-shadow .2s ease;
}
.field textarea { height: auto; min-height: 120px; padding: var(--space-3) var(--space-4); resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid var(--focus); outline-offset: 1px; border-color: var(--bim-800); }
.field .hint { font-size: var(--fs-xs); color: var(--gray-500); }
.field--error input, .field--error select, .field--error textarea { border-color: var(--danger); }
.field--error .hint { color: var(--danger); }
.form-note { font-size: var(--fs-xs); color: var(--gray-500); }
.form-status { font-size: var(--fs-sm); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); display: none; }
.form-status.is-success { display: block; background: var(--success-bg); color: var(--success); }
.form-status.is-error { display: block; background: var(--danger-bg); color: var(--danger); }

/* =========================================================
   页脚 Footer
   ========================================================= */
.site-footer { background: var(--brand-900); color: rgba(255,255,255,.78); }
.site-footer__top { display: grid; gap: var(--space-7); grid-template-columns: 1fr; padding: var(--space-9) 0; }
.site-footer .brand { color: #fff; font-size: 18px; font-weight: var(--fw-bold); display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-3); }
.site-footer .logo-mark { background: linear-gradient(135deg, var(--brand-500), var(--brand-900)); }
.site-footer p { font-size: var(--fs-sm); color: var(--gray-300); line-height: 1.7; }
.site-footer h4 { font-size: var(--fs-sm); color: #fff; margin-bottom: var(--space-3); font-weight: var(--fw-semibold); }
.site-footer ul { display: grid; gap: 10px; }
.site-footer ul li a, .site-footer ul li span { color: rgba(255,255,255,.78); font-size: var(--fs-sm); }
.site-footer ul li a:hover { color: #fff; }
.footer-muted { opacity: .85; }
.site-footer__bottom { border-top: var(--border-w) solid rgba(255,255,255,.12); padding: var(--space-5) 0; font-size: var(--fs-xs); display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: space-between; color: var(--gray-400); line-height: 1.7; }
.footer-weak { opacity: .6; }
a.footer-weak { color: rgba(255,255,255,.78); text-decoration: none; }
a.footer-weak:hover { opacity: 1; color: #fff; }
.footer-icp { color: rgba(255,255,255,.78); text-decoration: none; transition: color .2s ease; }
.footer-icp:hover { color: #fff; }

/* =========================================================
   响应式：平板 ≥768
   ========================================================= */
@media (min-width: 768px) {
  .site-nav__links { display: flex; }
  .site-nav__cta { display: inline-flex; }
  .nav-toggle { display: none; }

  .hero { height: 80vh; min-height: 520px; max-height: 720px; }
  .hero__scrim { background: linear-gradient(90deg, rgba(8,25,43,.82), rgba(8,25,43,.30) 45%, transparent 75%); }
  .hero__content { left: var(--container-pad); right: auto; bottom: var(--space-8); }
  .hero__arrow--prev { left: var(--space-7); }
  .hero__arrow--next { right: var(--space-7); }

  .about__grid { grid-template-columns: 1.2fr 1fr; }
  .stat { flex: 1 1 160px; }
  .value-strip { grid-template-columns: repeat(5, 1fr); }
  .process__track { grid-template-columns: repeat(3, 1fr); }
  .software-grid { grid-template-columns: 1fr 1fr; }
  .contact__grid { grid-template-columns: 1fr 1fr; }
  .site-footer__top { grid-template-columns: 1.5fr 1fr 1fr 1.2fr; }
}

/* =========================================================
   响应式：桌面 ≥1280
   ========================================================= */
@media (min-width: 1280px) {
  .biz-panels { height: 520px; }
  .process__track { grid-template-columns: repeat(5, 1fr); }
}

/* =========================================================
   移动端导航抽屉
   ========================================================= */
@media (max-width: 767px) {
  .site-nav__links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: var(--space-4);
    background: #fff; padding: var(--space-4) var(--container-pad);
    border-bottom: var(--border-w) solid var(--border); box-shadow: var(--shadow-hover);
  }
  .site-nav.open .site-nav__links { display: flex; }
  .site-nav.open .site-nav__cta { display: inline-flex; margin-top: var(--space-2); }
}

/* =========================================================
   动效降级
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .case-wall__slide:hover, .btn:hover { transform: none !important; }
}