/* 玺之泉科技官网 — 全局样式
   设计方向：图纸感工作室（纸色底 + 墨色字 + 铜强调），突出业务模块而非空泛品牌叙事 */

@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Serif+SC:wght@500;600;700&display=swap");

:root {
  --ink: #161411;
  --inkA: #ca8722;
  --ink-soft: #2b2722;
  --paper: #f3eee4;
  --paper-deep: #e7dfd0;
  --cream: #faf7f0;
  --copper: #c45d28;
  --copper-deep: #9a4318;
  --muted: #6a635b;
  --line: rgba(22, 20, 17, 0.12);
  --line-strong: rgba(22, 20, 17, 0.28);
  --white: #fffdf8;
  --shadow: 0 18px 50px rgba(22, 20, 17, 0.08);
  --max: 1180px;
  --header-h: 76px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-en: "Fraunces", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  /* 图纸网格底纹，强化「工程交付」气质 */
  background-image:
    linear-gradient(rgba(22, 20, 17, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 20, 17, 0.035) 1px, transparent 1px);
  background-size: 42px 42px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 80;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 238, 228, 0.92);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  letter-spacing: 0.04em;
}

.logo-mark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
}

.logo-en {
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav a {
  font-size: 14px;
  color: var(--ink-soft);
}

.nav a:hover,
.nav a.is-active {
  color: var(--copper);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  background: var(--inkA);
  color: var(--paper);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  background: var(--copper);
  border-color: var(--copper);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 4px auto;
  background: var(--ink);
}

/* ---------- 通用布局 ---------- */
.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 88px 0;
}

.kicker {
  margin: 0 0 12px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper);
}

.h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.25;
}

.lead {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.section-head {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 420px);
  gap: 32px;
  align-items: end;
  margin-bottom: 48px;
}

/* ---------- 首页 Hero：先抛业务主张 ---------- */
.hero {
  padding: 72px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 48px;
  align-items: end;
}

.hero h1 {
  margin: 10px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.12;
  font-weight: 700;
}

.hero h1 em {
  font-style: normal;
  color: var(--copper);
}

.hero-copy {
  max-width: 520px;
  margin: 0 0 28px;
  color: var(--ink-soft);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-aside {
  border: 1px solid var(--line-strong);
  background: var(--cream);
  padding: 28px 24px;
}

.hero-aside p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat b {
  display: block;
  font-family: var(--font-en);
  font-size: 28px;
  line-height: 1.1;
}

.stat span {
  font-size: 12px;
  color: var(--muted);
}

/* ---------- 业务清单（首页核心） ---------- */
.business-list {
  border-top: 1px solid var(--line-strong);
}

.biz-row {
  display: grid;
  grid-template-columns: 72px 1.1fr 1.4fr 88px;
  gap: 20px;
  align-items: start;
  padding: 28px 8px;
  border-bottom: 1px solid var(--line);
}

.biz-row:hover {
  background: rgba(196, 93, 40, 0.06);
}

.biz-no {
  font-family: var(--font-en);
  font-size: 22px;
  color: var(--copper);
}

.biz-row h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 24px;
}

.biz-row .tag {
  font-size: 12px;
  color: var(--muted);
}

.biz-row p {
  margin: 0;
  color: var(--ink-soft);
}

.biz-link {
  justify-self: end;
  align-self: center;
  color: var(--copper);
  font-size: 14px;
}

/* ---------- 能力条 / 流程 ---------- */
.band {
  background: var(--ink);
  color: var(--paper);
  /* 深色区块取消浅色网格，避免脏 */
  background-image: none;
}

.band .kicker {
  color: #e2a27a;
}

.band .lead,
.band .h2 {
  color: var(--paper);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 40px;
  background: rgba(243, 238, 228, 0.12);
  border: 1px solid rgba(243, 238, 228, 0.16);
}

.step {
  padding: 28px 22px 32px;
  background: var(--ink);
}

.step strong {
  display: block;
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
}

.step p {
  margin: 0;
  color: rgba(243, 238, 228, 0.72);
  font-size: 14px;
}

/* ---------- 案例卡 ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.case-card {
  display: flex;
  flex-direction: column;
  min-height: 320px;
  padding: 24px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.case-card .meta {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.case-card h3 {
  margin: 18px 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
}

.case-card p {
  margin: 0 0 auto;
  color: var(--ink-soft);
  font-size: 14px;
}

.case-card .result {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--copper-deep);
}

/* ---------- 内页页头 ---------- */
.page-hero {
  padding: 64px 0 28px;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.15;
}

/* ---------- 业务详情页：每条业务一块完整说明 ---------- */
.service-block {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.service-block .index {
  font-family: var(--font-en);
  font-size: 42px;
  color: var(--copper);
  line-height: 1;
}

.service-block h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 32px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 22px;
}

.chip {
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  font-size: 12px;
  color: var(--ink-soft);
}

.deliver {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.deliver h4 {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.deliver ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

/* ---------- 关于 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.value {
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--cream);
}

.value h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
}

.value p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 联系表单 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
}

.contact-card,
.form {
  padding: 28px;
  background: var(--cream);
  border: 1px solid var(--line);
}

.contact-card dt {
  margin-top: 16px;
  font-size: 12px;
  color: var(--muted);
}

.contact-card dd {
  margin: 4px 0 0;
  font-size: 16px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 12px;
  border: 1px solid var(--line-strong);
  background: var(--white);
  color: var(--ink);
  font-size: 14px;
}

.field textarea {
  min-height: 120px;
  resize: vertical;
}

.form-note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.form-success {
  display: none;
  padding: 16px;
  margin-bottom: 16px;
  border: 1px solid var(--copper);
  color: var(--copper-deep);
  background: rgba(196, 93, 40, 0.08);
}

.form.is-sent .form-success {
  display: block;
}

.form.is-sent .form-fields {
  display: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 48px 0 28px;
  border-top: 1px solid var(--line-strong);
  background: var(--paper-deep);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px;
}

.site-footer h4 {
  margin: 0 0 12px;
  font-family: var(--font-display);
}

.site-footer a,
.site-footer p {
  color: var(--ink-soft);
  font-size: 14px;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 8px;
}

.copyright {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

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

  .nav.is-open {
    display: flex;
  }

  .nav a,
  .nav .btn {
    padding: 12px 0;
  }

  .hero-grid,
  .section-head,
  .biz-row,
  .steps,
  .case-grid,
  .service-block,
  .deliver,
  .split,
  .values,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .biz-link {
    justify-self: start;
  }

  .section {
    padding: 64px 0;
  }
}