/* 鼎筑建材 — Unkey 构架节奏 × 建材工业视觉 */
:root {
  --bg: #f2efe8;
  --bg-deep: #e7e2d7;
  --ink: #1a1916;
  --ink-soft: #4a4740;
  --muted: #7a756a;
  --line: #d4cfc3;
  --accent: #2c4a45;
  --accent-2: #b86a2b;
  --brand-red: #e31c23;
  --white: #fcfbf8;
  --shadow: 0 18px 50px rgba(26, 25, 22, 0.08);
  --font-display: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --max: 1120px;
  --radius: 2px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(44, 74, 69, 0.07), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(184, 106, 43, 0.06), transparent 50%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  letter-spacing: -0.015em;
}

h3 {
  font-size: 1.15rem;
}

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

.lead {
  font-size: 1.05rem;
  max-width: 42rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(242, 239, 232, 0.88);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.logo-img {
  display: block;
  height: 48px;
  width: auto;
  max-width: 260px;
  background: transparent;
  object-fit: contain;
}

@media (max-width: 720px) {
  .logo-img {
    height: 36px;
    max-width: 180px;
  }
}

.brand-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}

.video-frame {
  position: relative;
  border: 1px solid var(--line);
  background: #111;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-frame iframe,
.video-frame video {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  object-fit: cover;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(252, 251, 248, 0.9);
  text-align: center;
  padding: 1.5rem;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.7)),
    url("https://images.unsplash.com/photo-1503387762-592deb58ef4e?auto=format&fit=crop&w=1200&q=70")
      center / cover;
}

.video-placeholder strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.stat-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.news-list {
  display: grid;
  gap: 1rem;
}

.news-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1rem;
  padding: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.news-item img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  background: var(--bg-deep);
}

.news-item .meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.news-item h3 a {
  color: inherit;
  text-decoration: none;
}

.news-item h3 a:hover {
  color: var(--accent);
}

.news-item .news-thumb {
  display: block;
}

/* Word 导入正文 HTML */
.article-body,
.article-html {
  line-height: 1.75;
  color: var(--ink-soft);
}

.article-body img,
.article-html img,
.article-cover {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.25rem auto;
  border: 1px solid var(--line);
}

.article-cover {
  margin: 0 0 1.25rem;
}

.article-body h2,
.article-html h2 {
  font-size: 1.35rem;
  margin: 1.5rem 0 0.65rem;
  color: var(--ink);
}

.article-body h3,
.article-html h3 {
  font-size: 1.15rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--ink);
}

.article-body h4,
.article-html h4 {
  font-size: 1.05rem;
  margin: 1rem 0 0.45rem;
  color: var(--ink-soft);
}

.article-body p,
.article-html p {
  margin: 0.65rem 0;
}

.article-body ul,
.article-html ul,
.article-body ol,
.article-html ol {
  padding-left: 1.25rem;
  margin: 0.65rem 0;
}

.article-body table,
.article-html table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.article-body .article-html table,
.article-html table {
  display: table;
}

.article-body blockquote,
.article-html blockquote {
  margin: 1rem 0;
  padding: 0.35rem 0 0.35rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
}

.article-body .caption,
.article-html .caption,
.article-body .subtitle,
.article-html .subtitle {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.article-body th,
.article-html th,
.article-body td,
.article-html td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

.article-body strong,
.article-html strong {
  font-weight: 700;
  color: var(--ink);
}

@media (max-width: 960px) {
  .brand-hero-grid,
  .news-item,
  .stat-band {
    grid-template-columns: 1fr;
  }
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--line);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.product-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.product-card .body {
  padding: 1.15rem 1.2rem 1.35rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card .tag {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-red);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.product-card h3 {
  margin-bottom: 0.45rem;
}

.product-card p {
  font-size: 0.92rem;
  flex: 1;
}

.product-card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.product-card .more {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  background: var(--accent);
  color: var(--white) !important;
  border-radius: var(--radius);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

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

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Hero — Unkey: full-bleed visual + title + CTA */
.hero {
  position: relative;
  min-height: min(88vh, 820px);
  display: grid;
  align-items: end;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(26, 25, 22, 0.15) 0%,
    rgba(26, 25, 22, 0.35) 45%,
    rgba(26, 25, 22, 0.88) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 0 3.5rem;
  color: var(--white);
}

.hero-content .eyebrow {
  color: #d8c7a8;
}

.hero-content h1,
.hero-content p {
  color: var(--white);
}

.hero-content p {
  opacity: 0.9;
  margin-top: 1rem;
  max-width: 36rem;
}

.hero .btn-primary {
  background: var(--accent-2);
}

.hero .btn-secondary {
  border-color: rgba(252, 251, 248, 0.55);
  color: var(--white);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(252, 251, 248, 0.2);
  font-size: 0.85rem;
  color: rgba(252, 251, 248, 0.75);
}

.trust-strip strong {
  display: block;
  color: var(--white);
  font-size: 1.1rem;
  font-family: var(--font-display);
}

/* Sections */
.section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  gap: 1rem;
  margin-bottom: 2.5rem;
  max-width: 46rem;
}

.section-alt {
  background: var(--bg-deep);
}

/* Control plane → 品类总览 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.category-card {
  background: var(--white);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.category-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.category-card .body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.category-card h3 {
  margin-bottom: 0.5rem;
}

.category-card a.more {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.feature-tile {
  padding: 1.1rem;
  border: 1px solid var(--line);
  background: rgba(252, 251, 248, 0.7);
}

.feature-tile h3 {
  margin-bottom: 0.4rem;
  font-size: 1rem;
}

.feature-tile p {
  font-size: 0.9rem;
}

/* Split panels — BuildDeploy / Gateway style */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.split.reverse {
  grid-template-columns: 0.95fr 1.05fr;
}

.split.reverse .split-copy {
  order: 2;
}

.split-media {
  border: 1px solid var(--line);
  overflow: hidden;
  background: #ddd8ce;
  min-height: 320px;
}

.split-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.panel-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.panel-item {
  padding: 0.95rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(252, 251, 248, 0.65);
}

.panel-item strong {
  display: block;
  margin-bottom: 0.2rem;
}

.panel-item span {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Spec table */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--white);
  margin-top: 1.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
}

th {
  background: #ebe6db;
  font-weight: 600;
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

/* Production / system cards */
.system-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.system-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.35rem;
}

.system-card .num {
  font-family: var(--font-display);
  color: var(--accent-2);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

/* Scale metrics */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.metric {
  padding: 1.4rem 1.2rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.metric strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  margin-bottom: 0.35rem;
}

/* Cases */
.cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.case-card {
  background: var(--white);
  border: 1px solid var(--line);
  overflow: hidden;
}

.case-card img {
  height: 180px;
  width: 100%;
  object-fit: cover;
}

.case-card .body {
  padding: 1.1rem 1.2rem 1.3rem;
}

.case-card .meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

/* FAQ — GEO */
.faq {
  display: grid;
  gap: 0.75rem;
}

.faq details {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1rem 1.15rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details[open] summary {
  margin-bottom: 0.65rem;
  color: var(--accent);
}

.faq details p {
  font-size: 0.95rem;
}

/* CTA */
.cta {
  position: relative;
  overflow: hidden;
  color: var(--white);
  border-bottom: 1px solid var(--line);
}

.cta-bg {
  position: absolute;
  inset: 0;
}

.cta-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(26, 25, 22, 0.78);
}

.cta .container {
  position: relative;
  z-index: 1;
  padding: 5rem 0;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: start;
}

.cta h2,
.cta p {
  color: var(--white);
}

.cta p {
  opacity: 0.88;
  margin-top: 0.85rem;
}

.form {
  display: grid;
  gap: 0.75rem;
  background: rgba(252, 251, 248, 0.08);
  border: 1px solid rgba(252, 251, 248, 0.2);
  padding: 1.25rem;
}

.form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.85rem;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid rgba(252, 251, 248, 0.25);
  background: rgba(252, 251, 248, 0.95);
  color: var(--ink);
  border-radius: var(--radius);
  font: inherit;
}

.form textarea {
  min-height: 90px;
  resize: vertical;
}

.form-note {
  font-size: 0.8rem;
  opacity: 0.75;
}

/* Footer */
.site-footer {
  padding: 3rem 0 2rem;
  background: #1a1916;
  color: rgba(252, 251, 248, 0.78);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 1.5rem;
}

.site-footer h3 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.site-footer a {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.site-footer a:hover {
  color: var(--white);
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(252, 251, 248, 0.12);
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-bottom .beian {
  color: inherit;
  text-decoration: none;
}

.footer-bottom .beian:hover {
  color: var(--white);
  text-decoration: underline;
}

/* Inner pages */
.page-hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background: var(--bg-deep);
}

.page-hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
}

.page-hero p {
  margin-top: 0.85rem;
  max-width: 40rem;
}

.prose {
  max-width: 46rem;
}

.prose h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.45rem;
}

.prose h3 {
  margin: 1.5rem 0 0.5rem;
}

.prose p,
.prose li {
  color: var(--ink-soft);
}

.prose ul {
  padding-left: 1.2rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.breadcrumb a:hover {
  color: var(--accent);
}

/* Motion */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
}

/* Responsive */
@media (max-width: 960px) {
  .category-grid,
  .split,
  .split.reverse,
  .cta .container,
  .footer-grid,
  .cases,
  .system-grid {
    grid-template-columns: 1fr;
  }

  .split.reverse .split-copy {
    order: 0;
  }

  .feature-row,
  .metrics {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem;
    gap: 0.85rem;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

@media (max-width: 560px) {
  .feature-row,
  .metrics {
    grid-template-columns: 1fr;
  }

  .container {
    width: min(100% - 1.5rem, var(--max));
  }
}

/* 计算器页 */
.calc-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
  align-items: start;
}
.calc-panel,
.calc-aside,
.calc-results {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1.35rem 1.4rem;
}
.calc-form label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
}
.calc-form input,
.calc-form select {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  font: inherit;
  background: #fff;
}
.calc-form .btn {
  width: 100%;
  margin-top: 0.5rem;
  text-align: center;
  justify-content: center;
}
.calc-privacy {
  margin-top: 0.85rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.calc-aside h2,
.calc-results h2 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}
.calc-results h3 {
  font-size: 1.05rem;
  margin: 1rem 0 0.5rem;
}
.calc-svg {
  width: 100%;
  max-width: 380px;
  display: block;
  margin: 0 auto 1rem;
  background: #f7f4ee;
}
.calc-card-info {
  font-size: 0.9rem;
  color: var(--ink-soft);
  background: #f0f5f4;
  padding: 0.85rem 1rem;
}
.calc-card-info ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}
.calc-row {
  display: grid;
  grid-template-columns: 1.4fr 1.6fr 0.7fr 0.5fr;
  gap: 0.5rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.92rem;
}
.calc-row .q {
  font-weight: 700;
  text-align: right;
}
.calc-note {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  background: #fff8e8;
  border-left: 4px solid var(--accent-2);
  font-size: 0.9rem;
}
.calc-note ol {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}
.calc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.calc-tab {
  border: 1px solid var(--line);
  background: #f7f4ee;
  padding: 0.55rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.calc-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.calc-results .meta {
  color: var(--muted);
  margin-bottom: 0.75rem;
}
@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
  .calc-row {
    grid-template-columns: 1fr 1fr;
  }
}