@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

/* =========================================
   CSS 变量 & 基础重置
   ========================================= */
:root {
  --c-dark: #111111;
  --c-light: #F5F5F5;
  --c-red: #E63946;
  --c-mid: #2a2a2a;
  --c-border: #333333;
  --c-muted: #888888;
  --font-display: 'Bebas Neue', 'Arial Black', sans-serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', Arial, sans-serif;
  --radius-card: 18px;
  --nav-height: 96px;
  --transition-base: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 17px;
  background: var(--c-dark);
  color: var(--c-light);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  background: var(--c-dark);
  color: var(--c-light);
  overflow-x: hidden;
}

article[id] {
  scroll-margin-top: calc(var(--nav-height) + 12px);
}

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

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

ul, ol {
  list-style: none;
}

/* =========================================
   布局工具
   ========================================= */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* =========================================
   顶部导航 — 双行
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-dark);
  border-bottom: 1px solid var(--c-border);
}

.header-brand-row {
  border-bottom: 1px solid var(--c-border);
  padding: 10px 0;
}

.header-brand-inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

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

.brand-text {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.06em;
  color: var(--c-light);
  line-height: 1;
}

.header-tagline {
  font-size: 0.8rem;
  color: var(--c-muted);
  letter-spacing: 0.05em;
  line-height: 1.3;
  max-width: 360px;
}

.header-nav-row {
  padding: 0;
}

.header-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-nav-list {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.main-nav-list li {
  border-right: 1px solid var(--c-border);
}

.main-nav-list li:first-child {
  border-left: 1px solid var(--c-border);
}

.nav-link {
  display: block;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--c-light);
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: background var(--transition-base), color var(--transition-base);
}

.nav-link:hover,
.nav-link:focus-visible {
  background: var(--c-red);
  color: var(--c-light);
  outline: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 10px 12px;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-light);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* =========================================
   Hero 区块
   ========================================= */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--c-dark);
  border-bottom: 2px solid var(--c-red);
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-top: 48px;
  padding-bottom: 48px;
  position: relative;
  z-index: 2;
}

.hero-bg-text {
  position: absolute;
  top: 50%;
  right: -20px;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: clamp(100px, 18vw, 240px);
  color: transparent;
  -webkit-text-stroke: 1px rgba(245,245,245,0.06);
  letter-spacing: 0.02em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

.hero-content {
  flex: 1;
  max-width: 680px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-red);
  margin-bottom: 12px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: 0.03em;
  color: var(--c-light);
  margin-bottom: 20px;
  overflow: hidden;
}

.hero-sub {
  font-size: 1.05rem;
  line-height: 1.65;
  color: rgba(245,245,245,0.75);
  max-width: 520px;
  margin-bottom: 28px;
}

.hero-cta {
  display: inline-block;
  background: var(--c-red);
  color: var(--c-light);
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  padding: 13px 36px;
  border-radius: 6px;
  min-height: 48px;
  line-height: 1.4;
  transition: background var(--transition-base), transform 0.2s ease;
}

.hero-cta:hover {
  background: #c0282f;
  transform: translateY(-2px);
}

.hero-deco {
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.deco-badge {
  width: 100px;
  height: 100px;
  border: 2px solid var(--c-red);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.deco-num {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1;
  color: var(--c-red);
}

.deco-label {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  color: var(--c-light);
}

/* =========================================
   正文布局 main > section > article
   ========================================= */
.site-main {
  flex: 1;
  padding: 60px 0 80px;
}

.content-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}

/* aside 在左侧 */
.content-aside {
  position: sticky;
  top: calc(var(--nav-height) + 16px);
}

.aside-inner {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  background: var(--c-mid);
}

.aside-title {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--c-red);
  margin-bottom: 16px;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 10px;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.aside-link {
  display: block;
  font-size: 0.83rem;
  font-weight: 500;
  color: rgba(245,245,245,0.75);
  padding: 7px 10px;
  border-radius: 8px;
  min-height: 36px;
  line-height: 1.4;
  transition: background var(--transition-base), color var(--transition-base);
}

.aside-link:hover {
  background: rgba(230,57,70,0.15);
  color: var(--c-light);
}

.aside-badge {
  margin-top: 20px;
  border-top: 1px solid var(--c-border);
  padding-top: 14px;
  text-align: center;
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.1em;
  color: rgba(245,245,245,0.12);
  user-select: none;
}

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

.content-section-inner {
  /* 容纳 page.content 注入的各个 article */
}

/* =========================================
   page.content 内部样式（各 article）
   ========================================= */
.content-section-inner article,
.content-section-inner > * + * {
  margin-top: 0;
}

.content-section-inner article {
  padding: 48px 0;
  border-bottom: 1px solid var(--c-border);
}

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

.content-section-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: 0.04em;
  line-height: 1.05;
  color: var(--c-light);
  margin-bottom: 6px;
}

.content-section-inner .subtitle,
.content-section-inner .subhead,
.content-section-inner .desc,
.content-section-inner .lead {
  font-size: 1.02rem;
  color: var(--c-red);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}

.content-section-inner h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  color: var(--c-light);
  margin: 28px 0 10px;
}

.content-section-inner p {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(245,245,245,0.85);
  margin-bottom: 16px;
  max-width: 72ch;
}

.content-section-inner ul,
.content-section-inner ol {
  list-style: none;
  margin-bottom: 16px;
}

.content-section-inner ul li,
.content-section-inner ol li {
  position: relative;
  padding-left: 22px;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(245,245,245,0.85);
  margin-bottom: 8px;
}

.content-section-inner ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--c-red);
  border-radius: 50%;
}

.content-section-inner ol {
  counter-reset: ol-counter;
}

.content-section-inner ol li {
  counter-increment: ol-counter;
}

.content-section-inner ol li::before {
  content: counter(ol-counter, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--c-red);
  line-height: 1.75;
}

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

.content-section-inner a {
  color: var(--c-red);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-base);
}

.content-section-inner a:hover {
  color: #ff6b74;
}

.content-section-inner blockquote {
  border-left: 3px solid var(--c-red);
  padding: 14px 20px;
  margin: 20px 0;
  background: var(--c-mid);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  font-style: italic;
  color: rgba(245,245,245,0.8);
}

/* 描边卡片 */
.content-section-inner .card,
.content-section-inner figure {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin: 20px 0;
  background: var(--c-mid);
}

/* =========================================
   页脚 — 极简 p + small
   ========================================= */
.site-footer {
  background: var(--c-mid);
  border-top: 2px solid var(--c-border);
  padding: 0;
}

.footer-cta-block {
  background: var(--c-red);
  padding: 40px 24px;
  text-align: center;
}

.footer-cta-text {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4rem);
  letter-spacing: 0.06em;
  color: var(--c-light);
  margin: 0;
}

/* footer 内 nav > dl > dt/dd > a */
.footer-nav {
  padding: 40px 24px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-nav-dl {
  display: grid;
  grid-template-columns: auto repeat(7, 1fr);
  gap: 8px 16px;
  align-items: center;
}

.footer-nav-group {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  white-space: nowrap;
  padding-right: 12px;
  border-right: 1px solid var(--c-border);
}

.footer-nav-dl dd {
  display: flex;
}

.footer-nav-dl dd a {
  font-size: 0.83rem;
  font-weight: 500;
  color: rgba(245,245,245,0.65);
  padding: 8px 10px;
  min-height: 40px;
  display: flex;
  align-items: center;
  border-radius: 6px;
  transition: color var(--transition-base), background var(--transition-base);
  white-space: nowrap;
}

.footer-nav-dl dd a:hover {
  color: var(--c-light);
  background: rgba(245,245,245,0.08);
}

.footer-copy {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 10px;
  font-size: 0.8rem;
  color: var(--c-muted);
  text-align: center;
}

.footer-copy small {
  font-size: inherit;
}

.footer-disclaimer {
  display: block;
  max-width: 1200px;
  margin: 0 auto 24px;
  padding: 0 24px;
  font-size: 0.75rem;
  color: rgba(136,136,136,0.65);
  text-align: center;
}

/* =========================================
   Kinetic Typography 动效
   ========================================= */
@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes titleReveal {
  from {
    opacity: 0;
    transform: translateY(60px) skewY(3deg);
    letter-spacing: 0.3em;
  }
  to {
    opacity: 1;
    transform: translateY(0) skewY(0deg);
    letter-spacing: 0.03em;
  }
}

@keyframes charBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes underlineExpand {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.hero-title {
  animation: titleReveal 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.1s;
}

.hero-eyebrow {
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-sub {
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.25s;
}

.hero-cta {
  animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.4s;
}

/* Scroll reveal — JS 触发 */
.kinetic-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.scroll-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.stagger-list li {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-list.is-visible li {
  opacity: 1;
  transform: translateX(0);
}

.stagger-list.is-visible li:nth-child(1) { transition-delay: 0s; }
.stagger-list.is-visible li:nth-child(2) { transition-delay: 0.07s; }
.stagger-list.is-visible li:nth-child(3) { transition-delay: 0.14s; }
.stagger-list.is-visible li:nth-child(4) { transition-delay: 0.21s; }
.stagger-list.is-visible li:nth-child(5) { transition-delay: 0.28s; }
.stagger-list.is-visible li:nth-child(6) { transition-delay: 0.35s; }

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .kinetic-reveal,
  .scroll-reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  .stagger-list li {
    opacity: 1 !important;
    transform: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* h2 + p.subtitle 标题装饰 */
.content-section-inner h2 + .subtitle,
.content-section-inner h2 + .subhead,
.content-section-inner h2 + .desc,
.content-section-inner h2 + .lead {
  display: inline-block;
  position: relative;
}

.content-section-inner h2 + .subtitle::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--c-red);
  margin-top: 4px;
  transform-origin: left;
  animation: underlineExpand 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
}

/* =========================================
   移动端响应式
   ========================================= */
@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .content-aside {
    position: static;
  }

  .aside-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
  }

  .aside-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .aside-badge {
    display: none;
  }

  .footer-nav-dl {
    grid-template-columns: 1fr 1fr;
  }

  .footer-nav-group {
    grid-column: 1 / -1;
    border-right: none;
    border-bottom: 1px solid var(--c-border);
    padding-bottom: 8px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-dark);
    border-bottom: 1px solid var(--c-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .main-nav.is-open {
    max-height: 480px;
  }

  .main-nav-list {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }

  .main-nav-list li {
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--c-border);
  }

  .main-nav-list li:first-child {
    border-left: none;
  }

  .nav-link {
    padding: 14px 24px;
    font-size: 0.95rem;
  }

  .header-nav-row {
    position: relative;
  }

  .header-brand-inner {
    flex-wrap: wrap;
  }

  .hero-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    padding-top: 36px;
    padding-bottom: 36px;
  }

  .hero-deco {
    align-self: flex-end;
  }

  .hero-bg-text {
    font-size: 28vw;
    right: -10px;
    opacity: 0.5;
  }

  .footer-nav-dl {
    grid-template-columns: 1fr 1fr;
    gap: 6px 12px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 16px;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-title {
    font-size: clamp(2.4rem, 10vw, 3.5rem);
  }

  .deco-badge {
    width: 72px;
    height: 72px;
  }

  .deco-num {
    font-size: 1.8rem;
  }

  .footer-nav-dl {
    grid-template-columns: 1fr;
  }

  .footer-cta-text {
    font-size: 1.8rem;
  }
}

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