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

/* ===========================
   CSS 自定义属性
   =========================== */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-gray-10: #1a1a1a;
  --c-gray-20: #333333;
  --c-gray-40: #666666;
  --c-gray-60: #999999;
  --c-gray-80: #cccccc;
  --c-gray-90: #e6e6e6;
  --c-gray-95: #f4f4f4;
  --c-surface: #0d0d0d;

  --font-body: 'Nunito Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-heading: 'Rubik', 'Helvetica Neue', Helvetica, Arial, sans-serif;

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

  --header-h: 64px;
  --nav-h: 40px;
  --grid-gap: 1rem;
  --grid-cols: 12;
  --max-w: 1280px;
  --border-w: 2px;
  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 8px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-white);
  background: var(--c-black);
  overflow-x: hidden;
}

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

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

ol, ul {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
}

/* ===========================
   12列网格工具类
   =========================== */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-9 { grid-column: span 9; }
.col-start-7 { grid-column-start: 7; }

/* ===========================
   站点包裹
   =========================== */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===========================
   头部 / 导航
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-black);
  border-bottom: var(--border-w) solid var(--c-white);
}

.header-inner {
  height: var(--header-h);
  align-items: center;
}

.header-brand .col-span-3 {
  display: flex;
  align-items: center;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: opacity var(--transition);
}

.brand-link:hover {
  opacity: 0.7;
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--c-white);
  white-space: nowrap;
}

.brand-logo {
  height: 36px;
  width: auto;
}

/* 导航：nav > ol > li > a */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.site-nav ol {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.site-nav ol li a {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  padding: 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--c-gray-80);
  border-left: 1px solid var(--c-gray-20);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.site-nav ol li:first-child a {
  border-left: none;
}

.site-nav ol li a:hover {
  color: var(--c-white);
  background: var(--c-gray-10);
}

/* 顶部公告条 */
.header-tagline {
  background: var(--c-white);
  color: var(--c-black);
  text-align: center;
  padding: 4px var(--space-4);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: none;
  border-top: 1px solid var(--c-gray-80);
}

.tagline-inner {
  display: block;
}

/* ===========================
   Hero 区块
   =========================== */
.hero-block {
  position: relative;
  min-height: 70vh;
  background: var(--c-surface);
  overflow: hidden;
  display: flex;
  align-items: center;
}

/* 点阵底纹 */
.hero-dot-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* 斜切底边 */
.hero-slash {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-black);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-block: var(--space-7);
}

.hero-text {
  text-align: right;
  padding-block: var(--space-5);
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-gray-60);
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-3);
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--c-gray-60);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  max-width: 480px;
  margin-left: auto;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 var(--space-4);
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  border: var(--border-w) solid var(--c-white);
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}

.hero-cta:hover {
  background: var(--c-black);
  color: var(--c-white);
}

.hero-media {
  position: absolute;
  left: 0;
  top: 0;
  width: 50%;
  height: 100%;
  z-index: 1;
  overflow: hidden;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

/* ===========================
   主体内容
   =========================== */
.site-main {
  flex: 1;
  background: var(--c-black);
}

/* main > article > figure/aside 交错 */
.content-section {
  align-items: start;
  padding-block: var(--space-7);
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
  border-bottom: 1px solid var(--c-gray-20);
}

/* aside 在内容左侧 */
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 40px + var(--space-3));
}

.aside-inner {
  padding: var(--space-3);
  border-left: var(--border-w) solid var(--c-white);
  background: var(--c-gray-10);
}

.aside-eyebrow {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-gray-40);
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
}

.aside-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
}

.aside-nav-list li {
  border-bottom: 1px solid var(--c-gray-20);
}

.aside-nav-list li:last-child {
  border-bottom: none;
}

.aside-nav-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: var(--space-1) 0;
  font-size: 0.875rem;
  color: var(--c-gray-80);
  transition: color var(--transition), padding-left var(--transition);
}

.aside-nav-list li a:hover {
  color: var(--c-white);
  padding-left: var(--space-1);
}

/* figure 区块 */
.content-figure {
  padding: var(--space-4);
  border-bottom: var(--border-w) solid var(--c-white);
  background: var(--c-gray-10);
}

.figure-caption {
  display: block;
  font-size: 0.75rem;
  color: var(--c-gray-40);
  margin-top: var(--space-2);
  font-style: normal;
  letter-spacing: 0.05em;
}

/* 眉题 + h2 */
.section-eyebrow {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-gray-40);
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
}

.section-heading {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.prose p {
  color: var(--c-gray-80);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

/* ===========================
   主正文内容区（page.content 注入）
   =========================== */
.main-content-section {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-block: var(--space-6);
}

.main-content-inner {
  width: 100%;
}

/* page.content 内部元素样式 */
.main-content-inner article {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--c-gray-20);
  scroll-margin-top: calc(var(--header-h) + 40px + var(--space-2));
}

.main-content-inner article:last-child {
  border-bottom: none;
}

.main-content-inner h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.375rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.025em;
  margin-bottom: var(--space-3);
  line-height: 1.15;
  padding-bottom: var(--space-2);
  border-bottom: var(--border-w) solid var(--c-white);
}

.main-content-inner h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 600;
  color: var(--c-white);
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.main-content-inner p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-gray-80);
  margin-bottom: var(--space-2);
}

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

.main-content-inner ul {
  list-style: disc;
}

.main-content-inner ol {
  list-style: decimal;
}

.main-content-inner li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-gray-80);
  margin-bottom: var(--space-1);
}

.main-content-inner a {
  color: var(--c-white);
  border-bottom: 1px solid var(--c-gray-40);
  transition: border-color var(--transition);
}

.main-content-inner a:hover {
  border-color: var(--c-white);
}

.main-content-inner strong {
  font-weight: 700;
  color: var(--c-white);
}

.main-content-inner blockquote {
  border-left: 4px solid var(--c-white);
  padding-left: var(--space-3);
  margin: var(--space-4) 0;
  color: var(--c-gray-60);
  font-style: italic;
}

.main-content-inner table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
  font-size: 0.9375rem;
}

.main-content-inner th,
.main-content-inner td {
  padding: var(--space-2);
  text-align: left;
  border: 1px solid var(--c-gray-20);
  color: var(--c-gray-80);
}

.main-content-inner th {
  background: var(--c-gray-10);
  color: var(--c-white);
  font-weight: 600;
}

/* ===========================
   页脚：footer > article×n
   =========================== */
.site-footer {
  background: var(--c-gray-10);
  border-top: var(--border-w) solid var(--c-white);
  margin-top: auto;
}

.footer-main {
  padding-block: var(--space-6);
  align-items: start;
}

.footer-col {
  padding: var(--space-2);
}

.footer-brand {
  margin-bottom: var(--space-2);
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--c-gray-60);
  line-height: 1.6;
}

.footer-eyebrow {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-gray-40);
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
}

.footer-col-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
}

.footer-nav-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.875rem;
  color: var(--c-gray-60);
  border-bottom: 1px solid var(--c-gray-20);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-nav-list li:last-child a {
  border-bottom: none;
}

.footer-nav-list li a:hover {
  color: var(--c-white);
  padding-left: var(--space-1);
}

.footer-contact {
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--c-gray-60);
}

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

.footer-bottom {
  border-top: 1px solid var(--c-gray-20);
  padding-block: var(--space-3);
  text-align: center;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--c-gray-60);
  margin-bottom: 4px;
}

.footer-note {
  font-size: 0.75rem;
  color: var(--c-gray-40);
}

/* ===========================
   卡片样式（正文内部可能出现）
   =========================== */
.card {
  border-radius: 0;
  background: var(--c-gray-10);
  border-bottom: var(--border-w) solid var(--c-white);
  padding: var(--space-3);
  transition: background var(--transition);
}

.card:hover {
  background: var(--c-gray-20);
}

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

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===========================
   响应式断点
   =========================== */
@media (max-width: 1024px) {
  .col-span-3 { grid-column: span 4; }
  .col-span-9 { grid-column: span 8; }
  .col-span-6 { grid-column: span 6; }
  .col-start-7 { grid-column-start: 7; }
  .col-span-4 { grid-column: span 6; }
}

@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  .grid-12 {
    grid-template-columns: 1fr;
    padding-inline: var(--space-2);
  }

  .col-span-3,
  .col-span-4,
  .col-span-6,
  .col-span-9 {
    grid-column: 1 / -1;
  }

  .col-start-7 {
    grid-column-start: 1;
  }

  .header-inner {
    display: flex;
    justify-content: space-between;
    padding-inline: var(--space-2);
    gap: var(--space-2);
  }

  .header-brand {
    flex-shrink: 0;
  }

  .site-nav ol {
    gap: 0;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
  }

  .site-nav ol li a {
    padding: 0 var(--space-1);
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .hero-block {
    min-height: 100svh;
    min-height: 100vh;
  }

  .hero-content {
    padding-block: var(--space-5);
  }

  .hero-text {
    text-align: left;
    padding-block: var(--space-4);
  }

  .hero-sub {
    margin-left: 0;
  }

  .hero-media {
    width: 100%;
    opacity: 0.2;
  }

  .content-aside {
    position: static;
  }

  .content-section {
    padding-block: var(--space-5);
    padding-inline: var(--space-2);
  }

  .main-content-section {
    padding-inline: var(--space-2);
    padding-block: var(--space-4);
  }

  .footer-main {
    grid-template-columns: 1fr;
    padding-inline: var(--space-2);
  }

  .footer-col {
    grid-column: 1 / -1;
    padding: var(--space-1) 0;
  }

  .main-content-inner article {
    scroll-margin-top: calc(var(--header-h) + 40px + var(--space-2));
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .site-nav {
    overflow: hidden;
  }

  .site-nav ol {
    max-width: calc(100vw - 140px);
  }

  .brand-text {
    font-size: 0.9375rem;
  }

  .footer-bottom {
    padding-inline: var(--space-2);
  }
}

/* ===========================
   无障碍聚焦样式
   =========================== */
:focus-visible {
  outline: 2px solid var(--c-white);
  outline-offset: 2px;
}

a:focus-visible {
  outline: 2px solid var(--c-white);
  outline-offset: 2px;
}

/* ===========================
   打印
   =========================== */
@media print {
  .site-header,
  .hero-block,
  .site-footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}

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