/* =========================================================
   半岛官方中文站 · 共享样式
   /assets/site.css
   设计主题：数据蓝图 Technical Blueprint
   ========================================================= */

:root {
  --color-midnight: #0A1E3C;
  --color-navy: #142C4A;
  --color-orange: #FF6B35;
  --color-text: #F5F7FA;
  --color-muted: #A0B0C9;
  --color-line: #2A3E5C;
  --color-success: #00C896;
  --color-warning: #FFD166;
  --color-light: #E8ECF1;
  --color-data: #4A90E2;

  --font-heading: 'Montserrat', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'Consolas', 'SF Mono', monospace;

  --container-w: 1200px;
  --container-pad: 24px;
  --header-h: 76px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.28);

  --z-skip: 3000;
  --z-progress: 1100;
  --z-header: 1000;
  --z-top: 900;
}

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

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

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-midnight);
  background-image:
    linear-gradient(rgba(42, 62, 92, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 62, 92, 0.22) 1px, transparent 1px);
  background-size: 48px 48px;
}

@media (min-width: 1024px) {
  body {
    background-attachment: fixed;
  }
}

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

a {
  color: var(--color-data);
  text-decoration-thickness: 1px;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

::selection {
  background: var(--color-orange);
  color: var(--color-midnight);
}

:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}

#main-content {
  flex: 1;
  outline: none;
}

@media (max-width: 767px) {
  :root {
    --container-pad: 16px;
    --header-h: 64px;
  }
}

/* ---------- 通用容器与辅助 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.text-muted {
  color: var(--color-muted);
}

.section {
  padding-block: 64px;
}

@media (max-width: 767px) {
  .section {
    padding-block: 40px;
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn--accent {
  background: var(--color-orange);
  color: var(--color-midnight);
  border-color: var(--color-orange);
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background: #ff8558;
  border-color: #ff8558;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-line);
}

.btn--outline:hover,
.btn--outline:focus-visible {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn--lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: var(--z-skip);
  padding: 12px 20px;
  background: var(--color-orange);
  color: var(--color-midnight);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(10, 30, 60, 0.92);
  border-top: 3px solid var(--color-orange);
  border-bottom: 1px solid var(--color-line);
}

@supports (backdrop-filter: blur(6px)) {
  .site-header {
    backdrop-filter: blur(6px);
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--header-h);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--color-text);
}

.site-brand__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-orange);
  color: var(--color-midnight);
  border-radius: 6px;
}

.site-brand__badge-text {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 16px;
  line-height: 1;
  letter-spacing: -0.03em;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.site-brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.site-header__cta-btn {
  flex-shrink: 0;
}

.site-header__coords {
  border-top: 1px solid var(--color-line);
  background: rgba(10, 30, 60, 0.55);
}

.site-header__coords-inner {
  display: flex;
  align-items: center;
  gap: 8px 24px;
  flex-wrap: wrap;
  padding-block: 5px;
}

.site-header__coord {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.site-header__coord:first-child {
  color: var(--color-orange);
}

/* ---------- 主导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text);
  background: rgba(255, 107, 53, 0.08);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-orange);
  border-bottom-color: var(--color-orange);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-orange);
  opacity: 0.7;
}

.site-nav__mobile-cta {
  display: none;
}

.site-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.site-nav-toggle:hover,
.site-nav-toggle:focus-visible {
  border-color: var(--color-orange);
  background: rgba(255, 107, 53, 0.08);
}

.site-nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
}

.site-nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease, background-color 0.2s ease;
}

.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);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  background: var(--color-midnight);
  border-top: 1px solid var(--color-line);
}

.site-footer::before {
  content: '';
  display: block;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--color-orange) 0 8px,
    transparent 8px 16px
  );
  opacity: 0.45;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 32px;
  padding-block: 56px 48px;
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
  margin-bottom: 16px;
}

.site-footer__brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--color-orange);
  color: var(--color-orange);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 13px;
  border-radius: 4px;
}

.site-footer__brand-name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
}

.site-footer__blurb {
  max-width: 34em;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
}

.site-footer__trust {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 16px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--color-warning);
  background: rgba(255, 209, 102, 0.06);
  border: 1px solid rgba(255, 209, 102, 0.3);
  border-left: 3px solid var(--color-warning);
  border-radius: 0 6px 6px 0;
  line-height: 1.6;
}

.site-footer__trust-dot {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  letter-spacing: 0;
}

.site-footer__heading-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-orange);
  letter-spacing: 0.04em;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer__link {
  display: inline-block;
  font-size: 14px;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
  color: var(--color-orange);
  padding-left: 4px;
}

.site-footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-footer__contact-value {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
}

.site-footer__bottom {
  border-top: 1px solid var(--color-line);
  background: rgba(6, 18, 38, 0.6);
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  flex-wrap: wrap;
  padding-block: 16px;
}

.site-footer__copyright,
.site-footer__cityline {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px;
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb__link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--color-orange);
}

.breadcrumb__sep {
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 12px;
}

.breadcrumb__current {
  color: var(--color-text);
}

/* ---------- 内页头部标题区 ---------- */
.page-hero {
  position: relative;
  padding-block: 56px 48px;
  border-bottom: 1px solid var(--color-line);
  background:
    radial-gradient(rgba(255, 107, 53, 0.12) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, rgba(42, 62, 92, 0.3) 1px, transparent 1px) 0 0 / 48px 48px;
}

.page-hero__index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.page-hero__index::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--color-orange);
}

.page-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.2;
}

.page-hero__lead {
  max-width: 640px;
  margin-top: 12px;
  color: var(--color-muted);
}

/* ---------- 章节标题 ---------- */
.section-title {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.section-title__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
  line-height: 1.6;
  border: 1px solid rgba(255, 107, 53, 0.45);
  border-radius: 3px;
  padding: 2px 10px;
  background: rgba(255, 107, 53, 0.08);
  white-space: nowrap;
}

.section-title__text {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
}

.section-title__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-line), transparent);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
  background: var(--color-navy);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  border-color: var(--color-orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
}

.card__text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid > * {
  grid-column: span 12;
}

@media (min-width: 641px) {
  .grid--2 > *,
  .grid--3 > *,
  .grid--4 > * {
    grid-column: span 6;
  }
}

@media (min-width: 1024px) {
  .grid--3 > * {
    grid-column: span 4;
  }

  .grid--4 > * {
    grid-column: span 3;
  }
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-muted);
  background: transparent;
}

.tag--orange {
  color: var(--color-orange);
  border-color: rgba(255, 107, 53, 0.5);
  background: rgba(255, 107, 53, 0.1);
}

.tag--success {
  color: var(--color-success);
  border-color: rgba(0, 200, 150, 0.5);
  background: rgba(0, 200, 150, 0.08);
}

.tag--warning {
  color: var(--color-warning);
  border-color: rgba(255, 209, 102, 0.5);
  background: rgba(255, 209, 102, 0.08);
}

/* ---------- 数据标签 ---------- */
.data-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: 1.6;
}

.data-label::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--color-orange);
  flex-shrink: 0;
}

/* ---------- 图片占位框架 ---------- */
.visual-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-navy);
  background-image:
    linear-gradient(rgba(42, 62, 92, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 62, 92, 0.4) 1px, transparent 1px);
  background-size: 24px 24px;
}

.visual-frame--wide {
  aspect-ratio: 16 / 9;
}

.visual-frame--square {
  aspect-ratio: 1 / 1;
}

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

.visual-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.1em;
}

.visual-frame__corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 0 solid var(--color-orange);
  z-index: 1;
}

.visual-frame__corner--tl {
  top: 8px;
  left: 8px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.visual-frame__corner--tr {
  top: 8px;
  right: 8px;
  border-top-width: 2px;
  border-right-width: 2px;
}

.visual-frame__corner--bl {
  bottom: 8px;
  left: 8px;
  border-bottom-width: 2px;
  border-left-width: 2px;
}

.visual-frame__corner--br {
  bottom: 8px;
  right: 8px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

/* ---------- 滚动进度与返回顶部 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-progress);
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-warning));
  border-radius: 0 3px 3px 0;
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.6);
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: var(--z-top);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-navy);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease,
    visibility 0.25s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: var(--color-midnight);
}

.back-to-top__arrow {
  font-size: 16px;
  line-height: 1;
}

.back-to-top__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* ---------- 滚动显现 ---------- */
[data-reveal].js-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  .site-header__coords-inner {
    gap: 4px 16px;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: block;
    background: var(--color-midnight);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.35s ease, opacity 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open="true"] {
    max-height: calc(100vh - var(--header-h) - 4px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 0;
    gap: 4px;
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 0;
    border-radius: 4px;
  }

  .site-nav__link[aria-current="page"] {
    background: rgba(255, 107, 53, 0.1);
  }

  .site-nav__mobile-cta {
    display: flex;
    margin: 14px 16px 16px;
  }

  .site-header__cta-btn {
    display: none;
  }

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

@media (min-width: 1024px) {
  .site-nav__mobile-cta {
    display: none;
  }

  .site-nav-toggle {
    display: none;
  }

  .site-header__cta-btn {
    display: inline-flex;
  }
}

@media (max-width: 767px) {
  .site-header__coords {
    display: none;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-block: 44px 36px;
  }

  .breadcrumb {
    padding-block: 12px;
  }
}

@media (min-width: 641px) and (max-width: 1023px) {
  .site-footer__main {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 动效偏好 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}