@import url('https://fonts.googleapis.com/css2?family=Noto+Naskh+Arabic:wght@400;500;600;700&family=Noto+Sans+Arabic:wght@300;400;500;700&display=swap');

/* ============================================================
   CSS 自定义属性
   ============================================================ */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-gray-10: #f0f0f0;
  --c-gray-20: #e0e0e0;
  --c-gray-40: #999999;
  --c-gray-60: #555555;
  --c-gray-80: #222222;
  --c-accent: #000000;

  --font-primary: 'Noto Sans Arabic', 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Noto Naskh Arabic', Georgia, serif;

  --base: 8px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  --grid-cols: 12;
  --grid-gap: 16px;
  --grid-max: 1280px;
  --content-max: 880px;

  --header-height: 112px;
  --scroll-offset: 112px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-black);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

/* ============================================================
   Scroll margin — 吸顶导航偏移
   ============================================================ */
div[id] {
  scroll-margin-top: var(--scroll-offset);
}

/* ============================================================
   布局容器
   ============================================================ */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   顶部导航：两行
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-black);
  color: var(--c-white);
  border-bottom: 2px solid var(--c-white);
}

.header-brand-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid rgba(255,255,255,0.15);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: var(--c-white);
  text-decoration: none;
  min-height: 40px;
}

.brand-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.brand-name {
  white-space: nowrap;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--c-gray-40);
  letter-spacing: 0.06em;
  display: none;
}

@media (min-width: 768px) {
  .brand-tagline {
    display: inline;
  }
}

/* 菜单行 */
.header-nav-row {
  padding: 0 var(--space-4);
  overflow-x: auto;
  scrollbar-width: none;
}

.header-nav-row::-webkit-scrollbar {
  display: none;
}

.header-nav-row nav > ol {
  display: flex;
  gap: 0;
  align-items: stretch;
}

.header-nav-row nav > ol > li > a {
  display: flex;
  align-items: center;
  height: 48px;
  padding: 0 var(--space-2);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--c-gray-20);
  white-space: nowrap;
  border-right: 1px solid rgba(255,255,255,0.08);
  transition: color 0.15s, background 0.15s;
  min-height: 40px;
}

.header-nav-row nav > ol > li:first-child > a {
  border-left: 1px solid rgba(255,255,255,0.08);
}

.header-nav-row nav > ol > li > a:hover {
  color: var(--c-white);
  background: rgba(255,255,255,0.06);
  text-decoration: none;
}

/* ============================================================
   Hero 区块
   ============================================================ */
.hero-section {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-black);
  color: var(--c-white);
  overflow: hidden;
}

/* 网格底纹 */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-7) var(--space-4);
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.hero-icon {
  margin-bottom: var(--space-2);
  opacity: 0.9;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.hero-sub {
  font-size: 1rem;
  color: var(--c-gray-40);
  max-width: 520px;
  line-height: 1.7;
}

/* ============================================================
   主内容区
   ============================================================ */
.site-main {
  flex: 1;
  background: var(--c-white);
}

.content-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: auto 1fr;
  gap: 0;
  max-width: var(--grid-max);
  margin: 0 auto;
  border-left: 1px solid var(--c-gray-20);
  border-right: 1px solid var(--c-gray-20);
}

/* figure 装饰条：横跨整行 */
.content-figure {
  grid-column: 1 / -1;
  grid-row: 1;
  display: block;
  height: var(--space-2);
  background: var(--c-black);
  margin: 0;
}

.figure-accent {
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    90deg,
    var(--c-black) 0px,
    var(--c-black) 32px,
    var(--c-white) 32px,
    var(--c-white) 40px
  );
}

/* aside 在内容左侧 */
.content-aside {
  grid-column: 1;
  grid-row: 2;
  border-right: 1px solid var(--c-gray-20);
  padding: var(--space-5) var(--space-3);
  position: sticky;
  top: var(--scroll-offset);
  align-self: start;
  max-height: calc(100vh - var(--scroll-offset));
  overflow-y: auto;
}

.aside-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray-60);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-1);
  border-bottom: 2px solid var(--c-black);
}

.aside-title > span {
  display: inline-block;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-nav-list li a {
  display: flex;
  align-items: center;
  padding: var(--space-1) var(--space-1);
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--c-gray-60);
  min-height: 40px;
  border-left: 2px solid transparent;
  padding-left: var(--space-2);
  transition: color 0.15s, border-color 0.15s;
}

.aside-nav-list li a:hover {
  color: var(--c-black);
  border-left-color: var(--c-black);
  text-decoration: none;
}

/* 正文内容区 */
.content-body {
  grid-column: 2;
  grid-row: 2;
  padding: var(--space-6) var(--space-5);
  min-width: 0;
}

/* ============================================================
   page.content 内部样式（div 通用）
   ============================================================ */
.content-body div {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--c-gray-20);
}

.content-body div:last-child {
  border-bottom: none;
}

.content-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.875rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.content-body h2 > span {
  display: inline;
}

.content-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.content-body h3 > span {
  display: inline;
}

.content-body p {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: var(--space-3);
  color: var(--c-gray-80);
}

.content-body ul,
.content-body ol {
  margin-bottom: var(--space-3);
  padding-left: var(--space-3);
}

.content-body ul {
  list-style: disc;
}

.content-body ol {
  list-style: decimal;
}

.content-body li {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: var(--space-1);
  color: var(--c-gray-80);
}

.content-body a {
  color: var(--c-black);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content-body a:hover {
  text-decoration: none;
}

.content-body strong {
  font-weight: 600;
}

.content-body blockquote {
  border-left: 4px solid var(--c-black);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-3) 0;
  font-style: italic;
  color: var(--c-gray-60);
  background: var(--c-gray-10);
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
  font-size: 0.9375rem;
}

.content-body th,
.content-body td {
  border: 1px solid var(--c-gray-20);
  padding: var(--space-1) var(--space-2);
  text-align: left;
}

.content-body th {
  background: var(--c-black);
  color: var(--c-white);
  font-weight: 600;
}

.content-body tr:nth-child(even) td {
  background: var(--c-gray-10);
}

/* ============================================================
   卡片样式（content 内如有 .card 类）
   ============================================================ */
.content-body .card {
  border: 1px solid var(--c-gray-20);
  border-bottom: 3px solid var(--c-black);
  border-radius: 0;
  padding: var(--space-3);
  margin-bottom: var(--space-3);
  transition: box-shadow 0.2s;
}

.content-body .card:hover {
  box-shadow: 4px 4px 0 var(--c-black);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  border-top: 2px solid var(--c-white);
  padding: var(--space-6) var(--space-4) var(--space-3);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  max-width: var(--grid-max);
  margin: 0 auto;
  padding-bottom: var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-address {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-style: normal;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-white);
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--c-gray-40);
  line-height: 1.6;
  max-width: 320px;
}

.footer-links-col ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 0;
}

.footer-links-col ul > li > a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: var(--space-1) var(--space-1);
  font-size: 0.8125rem;
  color: var(--c-gray-40);
  letter-spacing: 0.04em;
  transition: color 0.15s;
}

.footer-links-col ul > li > a:hover {
  color: var(--c-white);
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--grid-max);
  margin: var(--space-3) auto 0;
  font-size: 0.75rem;
  color: var(--c-gray-60);
}

/* ============================================================
   动效：Stagger List + Scroll Reveal
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .content-body div {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  .content-body div.is-visible {
    opacity: 1;
    transform: none;
  }

  .aside-nav-list li {
    opacity: 0;
    transform: translateX(-12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .aside-nav-list li.is-visible {
    opacity: 1;
    transform: none;
  }

  .aside-nav-list li:nth-child(1) { transition-delay: 0.05s; }
  .aside-nav-list li:nth-child(2) { transition-delay: 0.10s; }
  .aside-nav-list li:nth-child(3) { transition-delay: 0.15s; }
  .aside-nav-list li:nth-child(4) { transition-delay: 0.20s; }
  .aside-nav-list li:nth-child(5) { transition-delay: 0.25s; }
  .aside-nav-list li:nth-child(6) { transition-delay: 0.30s; }
  .aside-nav-list li:nth-child(7) { transition-delay: 0.35s; }
}

/* ============================================================
   响应式断点
   ============================================================ */

/* 平板 768–1023 */
@media (max-width: 1023px) {
  .content-section {
    grid-template-columns: 160px 1fr;
  }

  .content-body {
    padding: var(--space-5) var(--space-4);
  }
}

/* 移动端 < 768 */
@media (max-width: 767px) {
  :root {
    --scroll-offset: 96px;
  }

  .header-brand-row {
    padding: var(--space-2) var(--space-2);
  }

  .header-nav-row {
    padding: 0 var(--space-2);
  }

  .header-nav-row nav > ol > li > a {
    font-size: 0.75rem;
    padding: 0 var(--space-1);
    height: 44px;
    min-height: 44px;
  }

  .hero-section {
    min-height: 70vh;
  }

  .hero-inner {
    padding: var(--space-5) var(--space-2);
  }

  /* 移动端：aside 改为顶部折叠横条 */
  .content-section {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
  }

  .content-figure {
    grid-column: 1;
    grid-row: 1;
  }

  .content-aside {
    grid-column: 1;
    grid-row: 2;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--c-gray-20);
    padding: var(--space-3) var(--space-2);
    max-height: none;
    overflow: visible;
  }

  .aside-nav-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
  }

  .content-body {
    grid-column: 1;
    grid-row: 3;
    padding: var(--space-4) var(--space-2);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .footer-links-col ul {
    grid-template-columns: 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-1);
    text-align: center;
  }
}

/* 极小屏 375 */
@media (max-width: 400px) {
  .aside-nav-list {
    grid-template-columns: 1fr;
  }

  .footer-links-col ul {
    grid-template-columns: 1fr;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}