/* ==============================
   壹号官网 共享样式 site.css
   技术蓝图 x 展馆卡片
   ============================== */

/* ---------- CSS 变量 ---------- */
:root {
  /* 矿物色板 */
  --rock-dark: #2B3A36;
  --rock-mid: #5F6F6A;
  --rock-deep: #1A2321;
  --cream: #F4EFE6;
  --cream-warm: #EAE2D4;
  --moss-dark: #3E5A2F;
  --moss-light: #7E9E6B;
  --terracotta-dark: #A5572E;
  --terracotta-light: #E4B594;
  --accent-blue: #3B3A5A;

  /* 字体 */
  --font-display: 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-body: 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-meta: 'JetBrains Mono', 'Courier New', monospace;

  /* 布局 */
  --container-w: 1280px;
  --radius-pill: 999px;
  --radius-card: 16px;
  --space-section: clamp(48px, 8vw, 96px);
  --header-h: 72px;
}

/* ---------- Reset ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---------- 基础排版 ---------- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--rock-dark);
  background-color: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.25;
  color: var(--rock-dark);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  letter-spacing: 0.01em;
}

h2 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  letter-spacing: 0.02em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.625rem);
  letter-spacing: 0.03em;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--moss-dark);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

a:hover {
  color: var(--terracotta-dark);
}

ul, ol {
  padding-left: 1.25rem;
}

::selection {
  background: var(--terracotta-light);
  color: var(--rock-deep);
}

:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 4px;
  border-radius: 4px;
}

/* ---------- 可访问性 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  background: var(--rock-deep);
  color: var(--cream);
  padding: 12px 28px;
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: top 0.2s ease, color 0.2s ease;
}

.skip-link:focus {
  top: 16px;
  color: var(--cream);
}

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 20px;
}

@media (min-width: 768px) {
  .container { padding-inline: 40px; }
}

@media (min-width: 1024px) {
  .container { padding-inline: 48px; }
}

#main-content {
  scroll-margin-top: 96px;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

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

@media (max-width: 899px) {
  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
}

/* ---------- 展签 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-meta);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rock-mid);
  position: relative;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--terracotta-dark);
  flex-shrink: 0;
}

/* ---------- 蓝图背景 ---------- */
.blueprint-bg {
  position: relative;
  background-image:
    linear-gradient(rgba(43, 58, 54, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 58, 54, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn--primary {
  background: var(--moss-dark);
  color: var(--cream);
}

.btn--primary:hover {
  background: var(--rock-dark);
  color: var(--cream);
  transform: translateY(-1px);
}

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

.btn--secondary:hover {
  background: var(--rock-dark);
  color: var(--cream);
  transform: translateY(-1px);
}

/* ---------- 卡片 ---------- */
.card {
  display: block;
  background: var(--cream-warm);
  border: 1px solid rgba(43, 58, 54, 0.1);
  border-radius: var(--radius-card);
  padding: 28px;
  position: relative;
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--terracotta-dark);
  box-shadow: 0 8px 32px rgba(26, 35, 33, 0.08);
  transform: translateY(-2px);
}

.card::before,
.card::after {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--terracotta-dark);
  border-style: solid;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.card::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
  border-radius: 4px 0 0 0;
}

.card::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
  border-radius: 0 0 4px 0;
}

.card:hover::before,
.card:hover::after {
  opacity: 1;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--rock-dark);
  margin-bottom: 8px;
}

.card__desc {
  font-size: 0.875rem;
  color: var(--rock-mid);
  margin-bottom: 0;
}

.card__index {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-meta);
  font-size: 0.6875rem;
  color: var(--rock-mid);
  letter-spacing: 0.1em;
}

/* ---------- 图片容器 ---------- */
.figure {
  position: relative;
  display: block;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--cream-warm);
  aspect-ratio: 16 / 9;
}

.figure--square {
  aspect-ratio: 1 / 1;
}

.figure--tall {
  aspect-ratio: 3 / 4;
}

.figure__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border: 1px dashed rgba(95, 111, 106, 0.45);
  border-radius: var(--radius-card);
  font-family: var(--font-meta);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--rock-mid);
  background:
    linear-gradient(45deg, transparent 48%, rgba(95, 111, 106, 0.1) 48%, rgba(95, 111, 106, 0.1) 52%, transparent 52%),
    linear-gradient(-45deg, transparent 48%, rgba(95, 111, 106, 0.1) 48%, rgba(95, 111, 106, 0.1) 52%, transparent 52%);
  background-size: 16px 16px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0;
  margin: 0 0 24px;
  list-style: none;
  font-family: var(--font-meta);
  font-size: 0.75rem;
  color: var(--rock-mid);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: '/';
  color: rgba(95, 111, 106, 0.5);
}

.breadcrumb a {
  color: var(--moss-dark);
  text-decoration: none;
}

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

.breadcrumb [aria-current="page"] {
  color: var(--rock-dark);
  font-weight: 600;
}

/* ---------- 滚动进度条 ---------- */
[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--terracotta-dark), var(--accent-blue));
  z-index: 2100;
  pointer-events: none;
}

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px 16px;
  pointer-events: none;
}

.site-header__capsule {
  position: relative;
  max-width: var(--container-w);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(244, 239, 230, 0.88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(43, 58, 54, 0.1);
  border-radius: 22px;
  padding: 8px 12px 8px 20px;
  box-shadow: 0 8px 32px rgba(26, 35, 33, 0.06);
  pointer-events: auto;
  background-image:
    linear-gradient(rgba(59, 58, 90, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 58, 90, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}

@media (min-width: 900px) {
  .site-header__capsule {
    border-radius: var(--radius-pill);
    padding: 8px 12px 8px 24px;
  }
}

/* 品牌 */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 6px;
  border-radius: 10px;
  background: var(--accent-blue);
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.site-brand:hover .site-brand__mark {
  background: var(--moss-dark);
  transform: rotate(-3deg);
}

.site-brand__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--rock-dark);
  white-space: nowrap;
}

/* 主导航 */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--rock-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.site-nav__link:hover {
  background: var(--moss-dark);
  color: var(--cream);
}

.site-nav__link[aria-current="page"] {
  background: var(--rock-dark);
  color: var(--cream);
  font-weight: 500;
}

/* 头部 CTA */
.site-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--terracotta-dark);
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.site-header__cta:hover {
  background: var(--moss-dark);
  color: var(--cream);
  transform: translateY(-1px);
}

/* 导航抽屉内 CTA（移动端） */
.site-nav__cta {
  display: none;
}

/* 汉堡按钮 */
.site-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 12px;
  background: transparent;
  border: 1px solid rgba(43, 58, 54, 0.18);
  border-radius: 14px;
  cursor: pointer;
  margin-left: auto;
  flex-shrink: 0;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.site-nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--rock-dark);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.site-nav-toggle:hover {
  border-color: var(--rock-dark);
  background: rgba(43, 58, 54, 0.04);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 头部移动端 ---------- */
@media (max-width: 899px) {
  .site-header__cta {
    display: none;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 8px;
    right: 8px;
    flex: none;
    flex-direction: column;
    align-items: stretch;
    background: var(--cream);
    border: 1px solid rgba(43, 58, 54, 0.12);
    border-radius: 18px;
    box-shadow: 0 24px 48px rgba(26, 35, 33, 0.14);
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    z-index: 1001;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    gap: 2px;
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__link {
    display: block;
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 1rem;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--rock-dark);
    color: var(--cream);
  }

  .site-nav__cta {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 16px;
    padding: 14px 24px;
    border-radius: var(--radius-pill);
    background: var(--terracotta-dark);
    color: var(--cream);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
  }

  .site-nav__cta:hover {
    background: var(--moss-dark);
    color: var(--cream);
  }
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--rock-deep);
  color: rgba(244, 239, 230, 0.82);
  padding: 72px 20px 28px;
  position: relative;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(244, 239, 230, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 239, 230, 0.02) 1px, transparent 1px);
  background-size: 32px 32px;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--terracotta-dark) 0%, var(--accent-blue) 50%, var(--moss-dark) 100%);
  opacity: 0.55;
  pointer-events: none;
}

.site-footer__grid {
  max-width: var(--container-w);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 40px;
}

.site-footer__brand {
  grid-column: span 4;
}

.site-footer__brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--cream);
  text-decoration: none;
}

.site-footer__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 6px;
  border-radius: 10px;
  background: var(--accent-blue);
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.site-footer__brand-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--cream);
}

.site-footer__note {
  margin-top: 20px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.6);
  max-width: 320px;
}

.site-footer__nav {
  grid-column: span 2;
}

.site-footer__contact {
  grid-column: span 3;
}

.site-footer__label {
  margin-bottom: 16px;
  font-family: var(--font-meta);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss-light);
}

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

.site-footer__list li {
  margin-bottom: 10px;
}

.site-footer__list a {
  color: rgba(244, 239, 230, 0.75);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--terracotta-light);
}

.site-footer__item-note {
  font-size: 0.75rem;
  color: rgba(244, 239, 230, 0.45);
  margin-top: 12px;
}

.site-footer__bottom {
  max-width: var(--container-w);
  margin-inline: auto;
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid rgba(244, 239, 230, 0.1);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--font-meta);
  font-size: 0.75rem;
  color: rgba(244, 239, 230, 0.45);
}

/* 页脚移动端 */
@media (max-width: 899px) {
  .site-footer {
    padding-top: 56px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

  .site-footer__brand {
    grid-column: span 2;
  }

  .site-footer__nav {
    grid-column: span 1;
  }

  .site-footer__contact {
    grid-column: span 2;
  }

  .site-footer__bottom {
    margin-top: 48px;
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}