@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@300;400;500;600;700;900&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* ═══════════════════════════════════════════
   基础重置 & 自定义属性
═══════════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #c8ff00;
  --c-gray-900: #0a0a0a;
  --c-gray-800: #141414;
  --c-gray-700: #1e1e1e;
  --c-gray-600: #2a2a2a;
  --c-gray-400: #666666;
  --c-gray-200: #cccccc;
  --font-main: 'Archivo', 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-sub: 'Space Grotesk', system-ui, sans-serif;
  --nav-h: 72px;
  --header-h: 56px;
  --radius-pill: 999px;
  --radius-card: 4px;
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-black);
  color: var(--c-white);
}

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

/* scroll-margin for fixed bottom nav */
article[id] {
  scroll-margin-top: calc(var(--header-h) + 8px);
}

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

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

ul, ol {
  list-style: none;
}

/* ═══════════════════════════════════════════
   顶部品牌栏
═══════════════════════════════════════════ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 4px;
}

.brand-name {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: -0.04em;
  color: var(--c-white);
  white-space: nowrap;
}

.header-tagline {
  font-family: var(--font-sub);
  font-size: 0.75rem;
  color: var(--c-gray-400);
  letter-spacing: 0.04em;
  text-align: right;
  max-width: 240px;
  display: none;
}

/* ═══════════════════════════════════════════
   Hero 区块
═══════════════════════════════════════════ */
.hero-block {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  padding-top: var(--header-h);
  background: var(--c-black);
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 8rem 2rem 4rem;
  max-width: 1200px;
  width: 100%;
}

.hero-h1 {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: clamp(3rem, 12vw, 10rem);
  letter-spacing: -0.05em;
  line-height: 0.9;
  color: var(--c-white);
  margin-bottom: 2.5rem;
}

.hero-sub {
  font-family: var(--font-sub);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--c-gray-200);
  max-width: 600px;
  margin: 0 auto 3rem;
  line-height: 1.7;
  font-weight: 300;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.9rem 3rem;
  background: var(--c-accent);
  color: var(--c-black);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  border-radius: var(--radius-pill);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero-cta:hover, .hero-cta:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(200,255,0,0.35);
  outline: none;
}

/* 斜切色带分割线 */
.hero-slash {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 120px;
  background: var(--c-black);
  clip-path: polygon(0 60%, 100% 0, 100% 100%, 0 100%);
  z-index: 8;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.18;
  filter: grayscale(100%) contrast(1.4);
}

/* ═══════════════════════════════════════════
   正文主体布局
═══════════════════════════════════════════ */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
}

.content-article {
  min-width: 0;
}

.page-content-section {
  /* page.content 直接渲染 */
}

/* page.content 内部元素样式 */
.page-content-section h2 {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-top: 5rem;
  margin-bottom: 1.5rem;
  color: var(--c-white);
}

.page-content-section h2:first-child {
  margin-top: 0;
}

.page-content-section h3 {
  font-family: var(--font-main);
  font-weight: 700;
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  letter-spacing: -0.03em;
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: var(--c-white);
}

.page-content-section p {
  font-family: var(--font-sub);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-gray-200);
  margin-bottom: 1.25rem;
}

.page-content-section a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition-base);
}

.page-content-section a:hover {
  opacity: 0.75;
}

.page-content-section ul,
.page-content-section ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--c-gray-200);
  font-family: var(--font-sub);
  font-size: 1rem;
  line-height: 1.75;
}

.page-content-section ol {
  list-style: decimal;
}

.page-content-section li {
  margin-bottom: 0.4rem;
}

.page-content-section blockquote {
  border-left: 3px solid var(--c-accent);
  padding-left: 1.5rem;
  margin: 2rem 0;
  color: var(--c-gray-200);
  font-style: italic;
}

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

.page-content-section article {
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 3rem;
}

.page-content-section article:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* small 眉题 */
small {
  display: block;
  font-family: var(--font-sub);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.5rem;
}

/* ═══════════════════════════════════════════
   Aside 侧边栏
═══════════════════════════════════════════ */
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}

.aside-inner {
  background: var(--c-gray-800);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-card);
  padding: 2rem 1.5rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.aside-eyebrow {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: 0.4rem;
}

.aside-title {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--c-white);
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
}

.aside-nav-list li {
  list-style: none;
}

.aside-nav-link {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-sub);
  font-size: 0.88rem;
  color: var(--c-gray-200);
  border-radius: var(--radius-card);
  transition: background var(--transition-base), color var(--transition-base);
}

.aside-nav-link:hover, .aside-nav-link:focus-visible {
  background: rgba(200,255,0,0.08);
  color: var(--c-accent);
  outline: none;
}

.aside-badge {
  background: rgba(200,255,0,0.06);
  border: 1px solid rgba(200,255,0,0.2);
  border-radius: var(--radius-card);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.badge-label {
  font-size: 0.68rem;
  color: var(--c-gray-400);
  letter-spacing: 0.08em;
}

.badge-val {
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--c-accent);
}

/* ═══════════════════════════════════════════
   Footer
═══════════════════════════════════════════ */
.site-footer {
  background: var(--c-gray-900);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-bottom: calc(var(--nav-h) + 2rem);
}

/* 大 CTA 块 */
.footer-cta-block {
  text-align: center;
  padding: 8rem 2rem 6rem;
  background: var(--c-black);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-eyebrow {
  color: var(--c-accent);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  margin-bottom: 1rem;
}

.footer-cta-title {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 6rem);
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--c-white);
  margin-bottom: 1.5rem;
}

.footer-cta-desc {
  font-family: var(--font-sub);
  font-size: 1.05rem;
  color: var(--c-gray-400);
  margin-bottom: 2.5rem;
}

.footer-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.9rem 3rem;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  border-radius: var(--radius-pill);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base);
}

.footer-cta-btn:hover, .footer-cta-btn:focus-visible {
  background: var(--c-accent);
  color: var(--c-black);
  transform: translateY(-2px);
  outline: none;
}

/* 三栏区 */
.footer-columns {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 4rem 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-col-heading {
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray-400);
  margin-bottom: 1.25rem;
}

.footer-brand-name {
  font-family: var(--font-main);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.04em;
  color: var(--c-white);
  margin-bottom: 0.75rem;
}

.footer-brand-desc {
  font-family: var(--font-sub);
  font-size: 0.875rem;
  color: var(--c-gray-400);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.footer-logo {
  opacity: 0.6;
  max-width: 120px;
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-nav-list li {
  list-style: none;
}

.footer-nav-list a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--font-sub);
  font-size: 0.9rem;
  color: var(--c-gray-400);
  transition: color var(--transition-base);
}

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

.footer-address {
  font-style: normal;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-contact-list li {
  list-style: none;
}

.footer-contact-list a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--font-sub);
  font-size: 0.9rem;
  color: var(--c-gray-400);
  transition: color var(--transition-base);
}

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

/* 底栏 */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copyright {
  font-family: var(--font-sub);
  font-size: 0.78rem;
  color: var(--c-gray-400);
  line-height: 1.5;
}

.footer-legal {
  font-family: var(--font-sub);
  font-size: 0.78rem;
  color: var(--c-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ═══════════════════════════════════════════
   底部固定胶囊导航条
═══════════════════════════════════════════ */
.bottom-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 300;
  padding: 0.75rem 1rem;
  background: rgba(0,0,0,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.bottom-nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* nav > p > a 结构保证 */
.bottom-nav-inner > p {
  display: flex;
  align-items: center;
}

.bottom-nav-brand {
  flex-shrink: 0;
}

.bottom-brand-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 1.1rem;
  background: var(--c-white);
  color: var(--c-black);
  font-family: var(--font-main);
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: -0.03em;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: background var(--transition-base), color var(--transition-base);
}

.bottom-brand-link:hover {
  background: var(--c-accent);
}

.bottom-nav-links {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 1;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex-wrap: nowrap;
}

.bottom-nav-links::-webkit-scrollbar {
  display: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 1rem;
  font-family: var(--font-sub);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-gray-200);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  flex-shrink: 0;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.nav-link:hover, .nav-link:focus-visible {
  background: rgba(200,255,0,0.12);
  color: var(--c-accent);
  border-color: rgba(200,255,0,0.3);
  outline: none;
}

/* ═══════════════════════════════════════════
   Scroll Reveal 动效
═══════════════════════════════════════════ */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.4,0,0.2,1), transform 0.7s cubic-bezier(0.4,0,0.2,1);
  }
  .reveal.revealed {
    opacity: 1;
    transform: none;
  }
  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ═══════════════════════════════════════════
   响应式断点
═══════════════════════════════════════════ */
@media (min-width: 900px) {
  .header-tagline {
    display: block;
  }
}

@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr 240px;
    gap: 2.5rem;
  }
  .footer-columns {
    grid-template-columns: 1fr 1fr;
  }
  .footer-col-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 52px;
    --nav-h: 68px;
  }

  .content-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .content-aside {
    position: static;
    order: -1;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.5rem;
  }

  .footer-cta-block {
    padding: 5rem 1.5rem 4rem;
  }

  .main-content {
    padding: 4rem 1.25rem 3rem;
  }

  .hero-content {
    padding: 6rem 1.5rem 3rem;
  }

  .bottom-nav-bar {
    padding: 0.65rem 0.75rem;
  }

  .bottom-nav-inner {
    gap: 0.5rem;
  }

  .nav-link {
    font-size: 0.78rem;
    padding: 0 0.75rem;
    min-height: 44px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 1.25rem 1.5rem;
  }

  .page-content-section h2 {
    margin-top: 3.5rem;
  }

  .page-content-section article {
    margin-top: 2rem;
    padding-top: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: clamp(2.5rem, 14vw, 5rem);
  }

  .bottom-brand-link {
    font-size: 0.78rem;
    padding: 0 0.75rem;
    min-height: 44px;
  }
}

/* ═══════════════════════════════════════════
   Focus visible 无障碍
═══════════════════════════════════════════ */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ═══════════════════════════════════════════
   卡片通用
═══════════════════════════════════════════ */
.card {
  background: var(--c-gray-800);
  border-radius: var(--radius-card);
  box-shadow: 0 4px 24px rgba(0,0,0,0.35);
  padding: 1.5rem;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  transform: translateY(-2px);
}

/* 斜切装饰区块 */
.slash-section {
  position: relative;
  background: var(--c-gray-900);
  padding: 6rem 2rem;
  clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
  margin: 4rem 0;
}

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