/* ============================================================
   厚科官网设计系统 · 工程蓝图 × 东方编辑感
   暖纸白 + 墨蓝 + 朱砂 ｜ 宋体标题 + 黑体正文 ｜ 无外部依赖
   ============================================================ */

:root {
  /* ⚠️ 调色板 = 白底蓝色科技（2026-07 转蓝 → 转纯白底）。变量名为历史遗留，值已是蓝色系。 */
  --paper: #ffffff;        /* 主底色 = 纯白 */
  --paper-deep: #f2f7fd;   /* 交替区块的极淡蓝，制造节奏又不脏 */
  --surface: #ffffff;
  --ink: #0e2136;          /* 蓝调深墨 */
  --ink-soft: #33465e;
  --ink-mute: #6a7c93;
  --line: #cdd9e8;         /* 蓝图蓝网格线 */
  --line-soft: #dbe5f2;
  --vermilion: #1f6feb;    /* 主强调 = 科技蓝 */
  --vermilion-deep: #1552c0;
  --pine: #0e9bc7;         /* 次强调 = 青 */
  --navy: #0a1a30;         /* 深蓝段落底 */
  --navy-ink: #071324;

  /* signature 品牌渐变（蓝 → 青） */
  --ember: #38bdf8;        /* 深底上用的亮蓝 */
  --grad-brand: linear-gradient(100deg, #1f6feb 0%, #22c3e6 100%);
  --grad-brand-3: linear-gradient(105deg, #1f6feb 0%, #22c3e6 60%, #6ea8ff 120%);
  --grad-ember: linear-gradient(100deg, #38bdf8 0%, #22d3ee 100%); /* 深色底上更亮，用于数字 */

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-body: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;

  --w-max: 1200px;
  --gutter: clamp(20px, 4vw, 48px);
  --radius: 2px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* 纸张纹理 + 蓝图网格底 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .22;   /* 纯白底上网格要更克制，保留蓝图气质但不显脏 */
}

/* 抬升到蓝图底纹之上。注意：不要在此包含 header.site-header——
   它的选择器优先级会盖掉 .site-header 的 sticky 与 z-index:50，
   导致下拉菜单被 main 覆盖而点不中。 */
main, footer.site-footer { position: relative; z-index: 1; }

::selection { background: var(--vermilion); color: #fff; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.wrap {
  max-width: var(--w-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-bar {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
}

.brand-seal {
  height: 40px;
  width: auto;
  display: block;
}

.brand-name { display: flex; flex-direction: column; }
.brand-name b { font-family: var(--font-display); font-size: 18px; letter-spacing: 2px; }
.brand-name span { font-family: var(--font-mono); font-size: 10px; color: var(--ink-mute); letter-spacing: 1.5px; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 4px; }

.nav-links > li { position: relative; }

.nav-links > li > a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  transition: color .2s;
}

.nav-links > li > a:hover,
.nav-links > li > a[aria-current="page"] {
  color: var(--vermilion);
}

.nav-links > li > a[aria-current="page"] { border-bottom-color: var(--vermilion); }

/* 下拉 */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 230px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 rgba(15, 29, 43, .12);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  /* 收起时略作延迟，鼠标斜向移动更宽容 */
  transition: opacity .18s ease .16s, visibility .18s ease .16s, transform .18s ease .16s;
}

/* 悬停桥：填补导航项与下拉之间的空隙，避免鼠标移过去时菜单消失 */
.dropdown-menu::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -10px;   /* 与 .dropdown-menu 的 calc(100% + 10px) 间隙等高，避免盖住相邻导航项 */
  height: 10px;
}

.nav-links li:hover .dropdown-menu,
.nav-links li:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

.dropdown-menu a {
  display: block;
  padding: 9px 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.dropdown-menu a:hover { background: var(--paper-deep); color: var(--vermilion); }

.nav-cta {
  padding: 9px 20px;
  background: var(--navy);
  color: #fff !important;
  font-size: 14px;
  letter-spacing: 1px;
  transition: background .2s;
  border-bottom: none !important;
}

.nav-cta:hover { background: var(--vermilion); }

/* 移动端开关 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  width: 42px;
  height: 42px;
  cursor: pointer;
  font-size: 18px;
  color: var(--ink);
}

/* ---------- 通用区块 ---------- */

section { padding: clamp(64px, 10vw, 124px) 0; }

.section-head { margin-bottom: clamp(38px, 6vw, 68px); max-width: 760px; }

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--vermilion);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.kicker::before { content: ""; width: 34px; height: 3px; background: var(--grad-brand); border-radius: 2px; }

h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.35; }

h2 { font-size: clamp(26px, 3.6vw, 38px); letter-spacing: 1px; }

.section-head p { margin-top: 14px; color: var(--ink-soft); font-size: 16.5px; }

.btn {
  display: inline-block;
  padding: 13px 30px;
  font-size: 15px;
  letter-spacing: 2px;
  border: 1px solid var(--navy);
  transition: all .2s;
}

.btn-solid { background: var(--grad-brand); border-color: transparent; color: #fff; box-shadow: 4px 4px 0 var(--navy); }
.btn-solid:hover { filter: brightness(1.06); box-shadow: 6px 6px 0 var(--navy); transform: translateY(-1px); }

.btn-ghost { color: var(--ink); }
.btn-ghost:hover { border-color: var(--vermilion); color: var(--vermilion); }

.text-link {
  font-size: 14.5px;
  color: var(--vermilion);
  letter-spacing: .5px;
  border-bottom: 1px solid transparent;
}

.text-link:hover { border-bottom-color: var(--vermilion); }

/* ---------- Hero ---------- */

.hero { padding: clamp(72px, 11vw, 140px) 0 clamp(56px, 8vw, 96px); position: relative; overflow: hidden; }

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2.5px;
  color: var(--ink-mute);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 7px 16px;
  margin-bottom: 30px;
}

.hero-tag i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--vermilion);
  animation: pulse 2.2s infinite;
}

@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .3 } }

.hero h1 {
  font-size: clamp(42px, 7.2vw, 88px);
  letter-spacing: -1px;
  line-height: 1.08;
  max-width: 15em;
}

.hero h1 em {
  font-style: normal;
  background: var(--grad-brand-3);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--vermilion);
  position: relative;
}

.hero-sub {
  margin-top: 26px;
  max-width: 620px;
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--ink-soft);
}

.hero-actions { margin-top: 40px; display: flex; gap: 18px; flex-wrap: wrap; }

/* 右侧装饰印章 */
.hero-stamp {
  position: absolute;
  right: var(--gutter);
  top: 50%;
  transform: translateY(-50%) rotate(6deg);
  width: clamp(140px, 18vw, 230px);
  aspect-ratio: 1;
  border: 2px solid rgba(31, 111, 235, .5);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 58px);
  color: rgba(31, 111, 235, .55);
  letter-spacing: 6px;
  writing-mode: vertical-rl;
  pointer-events: none;
  user-select: none;
}

.hero-stamp::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(31, 111, 235, .3);
}

/* ---------- 数字条 ---------- */

.stats-band { background: radial-gradient(130% 150% at 88% -10%, rgba(56,189,248,.18), transparent 55%), var(--navy); color: #fff; padding: 0; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat {
  padding: clamp(28px, 4vw, 44px) clamp(18px, 2.5vw, 32px);
  border-left: 1px solid rgba(255, 255, 255, .12);
}

.stat:first-child { border-left: none; }

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  color: #fff;
  letter-spacing: 1px;
}

.stat b i { font-style: normal; background: var(--grad-ember); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: #38bdf8; }

.stat span { display: block; margin-top: 8px; font-size: 13.5px; color: rgba(255, 255, 255, .65); }

/* ---------- 卡片网格 ---------- */

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: clamp(26px, 3vw, 38px);
  position: relative;
  transition: transform .25s ease, box-shadow .25s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 rgba(15, 29, 43, .14);
}

.card .card-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 2px;
  margin-bottom: 18px;
  display: flex;
  justify-content: space-between;
}

.card .card-no::after { content: "→"; color: var(--vermilion); transition: transform .2s; }
.card:hover .card-no::after { transform: translateX(4px); }

.card h3 { font-size: 21px; margin-bottom: 12px; letter-spacing: 1px; }
.card p { font-size: 14.8px; color: var(--ink-soft); flex: 1; }
.card .text-link { margin-top: 20px; }

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--pine);
  border: 1px solid currentColor;
  padding: 3px 10px;
  margin-bottom: 16px;
  align-self: flex-start;
}

/* ---------- 负责任的 AI ---------- */

.principles { background: var(--paper-deep); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.principle-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }

.principle {
  background: var(--paper-deep);
  padding: clamp(26px, 3.4vw, 42px);
}

.principle b {
  font-family: var(--font-display);
  font-size: 19px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.principle b::before {
  content: attr(data-no);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--vermilion);
}

.principle p { font-size: 14.8px; color: var(--ink-soft); }

/* ---------- 能力栈横条 ---------- */

.cap-strip { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }

.cap-item {
  font-family: var(--font-display);
  font-size: clamp(16px, 1.8vw, 20px);
  padding: 14px 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  position: relative;
}

.cap-item::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 3px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s;
}

.cap-item:hover::before { transform: scaleX(1); }

/* ---------- 服务流程 ---------- */

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }

.step {
  padding: clamp(22px, 3vw, 36px) clamp(18px, 2.4vw, 30px);
  border-left: 1px solid var(--line);
  position: relative;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--vermilion);
  letter-spacing: 2px;
}

.step b { display: block; font-family: var(--font-display); font-size: 20px; margin: 12px 0 10px; }
.step p { font-size: 14.3px; color: var(--ink-soft); }

/* ---------- CTA 横幅 ---------- */

.cta-band {
  background: radial-gradient(110% 130% at 12% 0%, rgba(31,111,235,.24), transparent 52%), radial-gradient(120% 140% at 92% 105%, rgba(34,211,238,.18), transparent 55%), var(--navy);
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 56px 56px;
}

.cta-band .wrap { position: relative; }

.cta-band h2 { color: #fff; }

.cta-band p { margin: 18px auto 34px; max-width: 560px; color: rgba(255,255,255,.72); }

.cta-band .btn-solid { background: var(--grad-brand); border-color: transparent; box-shadow: 4px 4px 0 rgba(255,255,255,.22); }
.cta-band .btn-solid:hover { background: #fff; color: var(--navy); }

/* ---------- 页脚 ---------- */

.site-footer {
  background: var(--navy-ink);
  color: rgba(255,255,255,.6);
  padding: clamp(44px, 6vw, 64px) 0 28px;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-brand b { font-family: var(--font-display); color: #fff; font-size: 19px; letter-spacing: 2px; display: block; margin-bottom: 12px; }
.footer-brand p { font-size: 13.5px; max-width: 300px; }

.footer-col h4 { color: #fff; font-size: 14px; letter-spacing: 2px; margin-bottom: 16px; font-weight: 600; }
.footer-col li { margin-bottom: 10px; }
.footer-col a:hover { color: #38bdf8; }

.footer-contact li { margin-bottom: 10px; display: flex; gap: 10px; }
.footer-contact .mono { font-family: var(--font-mono); color: #fff; }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: rgba(255,255,255,.4);
}

.footer-bottom a:hover { color: #38bdf8; }

/* ---------- 内页通用 ---------- */

.page-hero {
  padding: clamp(56px, 8vw, 100px) 0 clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 1px;
  color: var(--ink-mute);
  margin-bottom: 26px;
}

.breadcrumb a:hover { color: var(--vermilion); }
.breadcrumb span::before { content: "/"; margin: 0 8px; color: var(--line); }

.page-hero h1 { font-size: clamp(32px, 5vw, 62px); letter-spacing: -0.5px; line-height: 1.12; max-width: 18em; }

.page-hero .lede { margin-top: 20px; max-width: 640px; font-size: 17px; color: var(--ink-soft); }

/* 痛点列表 */
.pain-list { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }

.pain {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--vermilion);
  padding: 22px 26px;
  font-size: 15px;
  color: var(--ink-soft);
}

.pain b { display: block; color: var(--ink); font-size: 16.5px; margin-bottom: 6px; font-weight: 600; }

/* 能力清单 */
.ability-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }

.ability { background: var(--surface); padding: 26px 30px; }
.ability b { font-family: var(--font-display); font-size: 18px; display: block; margin-bottom: 8px; }
.ability p { font-size: 14.5px; color: var(--ink-soft); }

/* 场景 */
.scene { border-top: 1px solid var(--line); padding: 26px 0; display: grid; grid-template-columns: 220px 1fr; gap: 24px; }
.scene:last-child { border-bottom: 1px solid var(--line); }
.scene b { font-family: var(--font-display); font-size: 18px; }
.scene p { font-size: 15px; color: var(--ink-soft); }

/* 方案架构讲述 */
.arch-note {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  padding: clamp(26px, 3.4vw, 42px);
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 860px;
}

.arch-note strong { color: var(--ink); }

/* ---------- 案例详情 ---------- */

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.meta-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 6px 14px;
  color: var(--ink-soft);
}

.case-body { display: grid; grid-template-columns: 1fr 300px; gap: clamp(32px, 5vw, 64px); align-items: start; }

.case-article > h2 {
  font-size: 24px;
  margin: 44px 0 18px;
  padding-top: 14px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.case-article > h2::before {
  content: attr(data-no);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--vermilion);
  letter-spacing: 2px;
}

.case-article > h2:first-child { margin-top: 0; }

.case-article p { margin-bottom: 16px; color: var(--ink-soft); font-size: 15.5px; }
.case-article strong { color: var(--ink); }

.case-article ul { margin: 0 0 16px; }
.case-article ul li {
  padding-left: 22px;
  position: relative;
  margin-bottom: 10px;
  color: var(--ink-soft);
  font-size: 15.5px;
}

.case-article ul li::before {
  content: "▪";
  position: absolute;
  left: 0;
  color: var(--vermilion);
  font-size: 12px;
  top: 4px;
}

/* 成效高亮块 */
.result-highlight {
  background: var(--navy);
  color: #fff;
  padding: clamp(26px, 3.4vw, 40px);
  margin: 24px 0;
}

.result-highlight b {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.3vw, 38px);
  display: block;
  background: var(--grad-ember);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: #38bdf8;
  margin-bottom: 8px;
}

.result-highlight span { font-size: 14.5px; color: rgba(255,255,255,.75); }

/* 侧栏 */
.case-aside {
  position: sticky;
  top: 96px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 28px;
}

.case-aside h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2.5px;
  color: var(--ink-mute);
  margin-bottom: 14px;
  font-weight: 500;
}

.case-aside h4:not(:first-child) { margin-top: 28px; }

.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tech-tags span {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  padding: 4px 10px;
  color: var(--ink-soft);
}

.case-aside .text-link { display: block; margin-top: 8px; font-size: 14px; }

.disclaim {
  font-size: 12.5px;
  color: var(--ink-mute);
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  margin-top: 28px;
}

/* ---------- 关于页 ---------- */

.timeline { border-left: 2px solid var(--line); margin-left: 8px; }

.timeline-item { position: relative; padding: 0 0 36px 34px; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  border: 2px solid var(--vermilion);
  border-radius: 50%;
}

.timeline-item b { font-family: var(--font-mono); color: var(--vermilion); font-size: 14px; letter-spacing: 1px; display: block; margin-bottom: 6px; }
.timeline-item h3 { font-size: 19px; margin-bottom: 8px; }
.timeline-item p { font-size: 15px; color: var(--ink-soft); max-width: 640px; }

.contact-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.contact-block { padding: clamp(28px, 4vw, 46px); border-left: 1px solid var(--line); }
.contact-block:first-child { border-left: none; }
.contact-block h3 { font-size: 20px; margin-bottom: 18px; }
.contact-block li { margin-bottom: 12px; font-size: 15px; color: var(--ink-soft); display: flex; gap: 12px; }
.contact-block .mono { font-family: var(--font-mono); color: var(--ink); }

/* ---------- 入场动画 ---------- */

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 配图：SVG 插画与图标 ---------- */

.hero .wrap { position: relative; z-index: 1; }

.hero-figure {
  position: absolute;
  right: clamp(24px, 4vw, 72px);
  top: 50%;
  transform: translateY(-50%);
  width: clamp(320px, 36vw, 480px);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
.hero-figure svg { width: 100%; height: auto; display: block; }

/* Hero 配图为深色几何图。用 screen 混合「只提亮暗部、保留亮线条」，
   把纯黑抬成站内深蓝色调，避免浅底上黑白反差过硬。 */
.hero-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid #c3d2e6;
  box-shadow: 0 18px 40px rgba(15, 40, 80, .12);
}

.hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: #4a7cc4;
  mix-blend-mode: screen;
  opacity: .72;   /* 白底反差更大，暗部要再提亮，让它读作「蓝色面板」而非黑块 */
  pointer-events: none;
}

/* 方案卡片图标（线性，hover 转朱砂） */
.card-icon {
  width: 48px; height: 48px;
  display: block;
  margin-bottom: 20px;
  color: var(--ink);
  transition: color .25s ease, transform .25s ease;
}
.card:hover .card-icon { color: var(--vermilion); transform: translateY(-2px); }

/* 精选案例卡小图标 */
.case-ico { width: 36px; height: 36px; display: block; margin-bottom: 14px; color: var(--pine); }
.card:hover .case-ico { color: var(--vermilion); }

/* 负责任的 AI 原则图标（置于卡片右上） */
.principle { position: relative; }
.principle-ico {
  position: absolute;
  top: clamp(24px, 3.2vw, 40px);
  right: clamp(24px, 3.2vw, 40px);
  width: 30px; height: 30px;
  color: var(--vermilion);
  opacity: .85;
}

/* 能力栈抽象小图 + 服务流程连接线（点缀） */
.figure-inline { display: block; margin: 8px 0 0; color: var(--ink-mute); }

@media (max-width: 1020px) {
  .hero-figure { display: none; }
}

/* ---------- 照片：蓝色 duotone 与图文分栏 ---------- */

.media-duotone {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--navy);
}
.media-duotone img {
  display: block; width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.03) brightness(1.05);
}
.media-duotone::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(21, 82, 192, .72), rgba(34, 195, 230, .42));
  mix-blend-mode: multiply;
}

/* 图文分栏（文字 + 蓝调照片） */
.photo-split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 60px); align-items: center; }
.photo-split .media-duotone { aspect-ratio: 4 / 3; }
.photo-split .split-body h2 { margin-bottom: 18px; }
.photo-split .split-body p { color: var(--ink-soft); font-size: 15.5px; line-height: 1.8; }

/* 双图并排 */
.photo-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.photo-strip .media-duotone { aspect-ratio: 16 / 10; }

/* 深色段照片氛围底（照片作背景，深蓝叠层保可读） */
.band-photo { position: relative; }
.band-photo::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background-image: var(--band-img);
  background-size: cover; background-position: center;
  opacity: .28;
}
.band-photo > .wrap { position: relative; z-index: 1; }

/* 页头下方宽幅页图 */
.photo-band-sec { padding-top: 0; }
.hero-photo { aspect-ratio: 16 / 5; }
@media (max-width: 700px) { .hero-photo { aspect-ratio: 16 / 9; } }

@media (max-width: 820px) {
  .photo-split { grid-template-columns: 1fr; }
  .photo-strip { grid-template-columns: 1fr; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1020px) {
  .case-body { grid-template-columns: 1fr; }
  .case-aside { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stamp { display: none; }
}

@media (max-width: 820px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 0 20px;
    gap: 0;
  }

  .nav-links.open { display: flex; }
  .nav-links > li > a { padding: 13px var(--gutter); border-bottom: none; }

  /* 移动端下拉为静态展开，悬停桥会挡住导航项点击，需禁用 */
  .dropdown-menu::before { display: none; }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--line);
    margin: 0 var(--gutter) 8px;
    padding: 0;
  }

  .nav-cta { margin: 10px var(--gutter) 0; text-align: center; }

  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat { border-left: none; border-top: 1px solid rgba(255,255,255,.12); }
  .grid-2, .grid-3, .principle-list, .pain-list, .ability-list { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .step { border-left: none; border-top: 1px solid var(--line); }
  .scene { grid-template-columns: 1fr; gap: 8px; }
  .contact-panel { grid-template-columns: 1fr; }
  .contact-block { border-left: none; border-top: 1px solid var(--line); }
}

@media (max-width: 520px) {
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}