@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@300;400;500;600;700&family=Orbitron:wght@400;500;600;700&display=swap');

/* ============================================================
   CSS 自定义属性 & 全局重置
   ============================================================ */
:root {
  --c-white: #ffffff;
  --c-light: #f5f5f5;
  --c-dark: #1f1f1f;
  --c-dark-60: rgba(31,31,31,0.6);
  --c-dark-10: rgba(31,31,31,0.1);
  --c-dark-04: rgba(31,31,31,0.04);
  --c-accent: #1f1f1f;

  /* 阴影四级 */
  --shadow-sm: 0 1px 3px rgba(31,31,31,0.10), 0 1px 2px rgba(31,31,31,0.08);
  --shadow-md: 0 4px 12px rgba(31,31,31,0.12), 0 2px 6px rgba(31,31,31,0.08);
  --shadow-lg: 0 8px 24px rgba(31,31,31,0.14), 0 4px 12px rgba(31,31,31,0.10);
  --shadow-xl: 0 16px 48px rgba(31,31,31,0.18), 0 8px 24px rgba(31,31,31,0.12);

  --font-display: 'Orbitron', 'Exo 2', 'Courier New', monospace;
  --font-body: 'Exo 2', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --radius-card: 4px;
  --nav-height: 100px;
  --transition-base: 0.28s cubic-bezier(0.4,0,0.2,1);

  --z-base: 1;
  --z-card: 2;
  --z-float: 3;
  --z-overlay: 4;
  --z-header: 100;
  --z-fullmenu: 200;
}

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

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

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

/* Scroll margin for sticky nav */
section[id] {
  scroll-margin-top: calc(var(--nav-height) + 16px);
}

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

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

ul {
  list-style: none;
}

/* ============================================================
   全屏遮罩菜单
   ============================================================ */
.fullscreen-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-fullmenu);
  pointer-events: none;
  visibility: hidden;
}

.fullscreen-menu.is-open {
  pointer-events: all;
  visibility: visible;
}

.fullscreen-menu__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(31,31,31,0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.fullscreen-menu.is-open .fullscreen-menu__backdrop {
  opacity: 1;
}

.fullscreen-menu__panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  height: 100%;
  padding: 2.5rem 5vw;
  transform: translateX(-40px);
  transition: transform 0.38s cubic-bezier(0.4,0,0.2,1);
}

.fullscreen-menu.is-open .fullscreen-menu__panel {
  transform: translateX(0);
}

.menu-close-btn {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: none;
  border: 1.5px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-card);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0;
  transition: border-color var(--transition-base);
}

.menu-close-btn:hover {
  border-color: rgba(255,255,255,0.5);
}

.menu-close-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--c-white);
}

.menu-close-btn span:first-child {
  transform: rotate(45deg) translateY(5.25px);
}

.menu-close-btn span:last-child {
  transform: rotate(-45deg) translateY(-5.25px);
}

.fullscreen-menu__nav p {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.fmenu-link {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 600;
  color: var(--c-white);
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease calc(var(--i, 0) * 0.06s),
              transform 0.3s ease calc(var(--i, 0) * 0.06s),
              color var(--transition-base);
}

.fullscreen-menu.is-open .fmenu-link {
  opacity: 1;
  transform: translateY(0);
}

.fmenu-link:hover {
  color: var(--c-light);
  padding-left: 1rem;
}

.fullscreen-menu__brand {
  margin-top: 3rem;
}

.fmenu-brand-name {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* ============================================================
   站点头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--c-white);
  border-bottom: 1px solid var(--c-dark-10);
  box-shadow: var(--shadow-md);
}

.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 5vw;
  border-bottom: 1px solid var(--c-dark-04);
}

.header-brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.brand-text-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-dark);
  letter-spacing: 0.06em;
}

.header-brand-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-card);
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base),
              box-shadow var(--transition-base), transform var(--transition-base);
  border: 1.5px solid transparent;
  white-space: nowrap;
  min-height: 40px;
}

.primary-cta {
  background: var(--c-dark);
  color: var(--c-white);
  border-color: var(--c-dark);
}

.primary-cta:hover {
  background: #333;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.secondary-cta {
  background: transparent;
  color: var(--c-dark);
  border-color: var(--c-dark-10);
}

.secondary-cta:hover {
  border-color: var(--c-dark);
  background: var(--c-light);
}

.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: 1.5px solid var(--c-dark-10);
  border-radius: var(--radius-card);
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.hamburger-btn:hover {
  border-color: var(--c-dark);
  background: var(--c-light);
}

.hamburger-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--c-dark);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* 导航行 */
.header-nav-row {
  padding: 0 5vw;
}

.header-inline-nav p {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.header-inline-nav p a {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-dark-60);
  padding: 0.6rem 0.9rem;
  min-height: 40px;
  letter-spacing: 0.02em;
  position: relative;
  transition: color var(--transition-base);
}

.header-inline-nav p a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0.9rem;
  right: 0.9rem;
  height: 2px;
  background: var(--c-dark);
  transform: scaleX(0);
  transition: transform var(--transition-base);
  transform-origin: left;
}

.header-inline-nav p a:hover {
  color: var(--c-dark);
}

.header-inline-nav p a:hover::after {
  transform: scaleX(1);
}

/* ============================================================
   Hero 区域
   ============================================================ */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  flex-direction: column;
  background: var(--c-white);
  overflow: hidden;
  border-bottom: 1px solid var(--c-dark-10);
}

.hero-inner {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 3rem;
  padding: 3rem 5vw 2rem;
  position: relative;
  z-index: var(--z-card);
}

.hero-content {
  flex: 1;
  min-width: 0;
}

.hero-eyebrow {
  margin-bottom: 0.75rem;
}

.hero-eyebrow span {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-dark-60);
  border: 1px solid var(--c-dark-10);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-card);
}

.hero-h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--c-dark);
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1rem;
  color: var(--c-dark-60);
  max-width: 520px;
  margin-bottom: 1.75rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-cta {
  font-size: 0.88rem;
  padding: 0.7rem 1.75rem;
}

/* Hero 图标装饰 */
.hero-visual {
  flex-shrink: 0;
  width: 160px;
  height: 140px;
  position: relative;
}

.hero-icon-stack {
  position: relative;
  width: 100%;
  height: 100%;
}

.hicon {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-white);
  border: 1px solid var(--c-dark-10);
  border-radius: var(--radius-card);
}

.hicon-1 {
  width: 96px;
  height: 96px;
  top: 0;
  left: 0;
  z-index: var(--z-card);
  box-shadow: var(--shadow-lg);
  transform: translateZ(8px);
}

.hicon-2 {
  width: 64px;
  height: 64px;
  bottom: 0;
  right: 0;
  z-index: var(--z-float);
  box-shadow: var(--shadow-md);
  transform: translateZ(16px);
}

.hicon-3 {
  width: 44px;
  height: 44px;
  top: 60px;
  right: 20px;
  z-index: var(--z-base);
  box-shadow: var(--shadow-sm);
  background: var(--c-light);
}

/* 深度装饰条 */
.hero-depth-bar {
  display: flex;
  gap: 4px;
  padding: 0 5vw 1.25rem;
}

.depth-line {
  height: 3px;
  border-radius: 2px;
}

.dl1 { flex: 4; background: var(--c-dark); }
.dl2 { flex: 2; background: var(--c-dark-10); }
.dl3 { flex: 1; background: var(--c-dark-04); }

/* ============================================================
   主体内容区
   ============================================================ */
.site-main {
  max-width: 1320px;
  margin: 0 auto;
  padding: 3rem 5vw 5rem;
}

.layer-section {
  display: grid;
  grid-template-columns: 1fr 280px;
  grid-template-rows: auto 1fr;
  gap: 2rem;
  position: relative;
}

.content-figure {
  grid-column: 1 / 2;
  grid-row: 1 / 2;
  position: relative;
  height: 6px;
  margin-bottom: -0.5rem;
  display: flex;
  gap: 3px;
}

.figure-layer {
  border-radius: 2px;
}

.fl1 { flex: 5; background: var(--c-dark); opacity: 0.85; }
.fl2 { flex: 3; background: var(--c-dark-10); }
.fl3 { flex: 2; background: var(--c-dark-04); }

.content-body {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
  min-width: 0;
}

/* 正文内容样式 */
.content-body h2 {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 700;
  color: var(--c-dark);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-dark-10);
}

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

.content-body h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-dark);
  margin-top: 1.75rem;
  margin-bottom: 0.6rem;
  letter-spacing: 0.03em;
}

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

.content-body p {
  font-size: 1rem;
  line-height: 1.75;
  color: #333;
  margin-bottom: 1rem;
}

.content-body ul,
.content-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

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

.content-body li {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 0.4rem;
}

.content-body strong {
  font-weight: 600;
  color: var(--c-dark);
}

.content-body em {
  font-style: italic;
}

.content-body blockquote {
  border-left: 3px solid var(--c-dark);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--c-light);
  font-size: 0.95rem;
  color: var(--c-dark-60);
}

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

.content-body a:hover { opacity: 0.7; }

/* section 内容块：page.content 内部的 section 样式 */
.content-body section {
  margin-bottom: 2.5rem;
  padding: 1.75rem;
  background: var(--c-white);
  border: 1px solid var(--c-dark-10);
  border-bottom: 3px solid var(--c-dark);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: var(--z-base);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.content-body section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* 侧边栏 */
.content-aside {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: sticky;
  top: calc(var(--nav-height) + 1.5rem);
  align-self: start;
}

.aside-card {
  background: var(--c-light);
  border: 1px solid var(--c-dark-10);
  border-bottom: 3px solid var(--c-dark);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: var(--z-card);
}

.aside-title {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-dark);
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-dark-10);
}

.aside-title span {
  display: inline;
}

.aside-nav-list li {
  border-bottom: 1px solid var(--c-dark-04);
}

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

.aside-nav-list li a {
  display: block;
  font-size: 0.875rem;
  padding: 0.45rem 0;
  color: var(--c-dark-60);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.aside-nav-list li a:hover {
  color: var(--c-dark);
  padding-left: 0.5rem;
}

.aside-tip-text {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--c-dark-60);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--c-dark);
  color: var(--c-white);
  margin-top: 4rem;
}

.footer-top {
  padding: 3.5rem 5vw 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 2.5rem;
  max-width: 1320px;
  margin: 0 auto;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.75rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.5);
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 1rem;
}

.footer-col-title span {
  display: inline;
}

.footer-col-nav ul li {
  margin-bottom: 0.1rem;
}

.footer-col-nav ul li a {
  display: inline-flex;
  align-items: center;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  padding: 0.3rem 0;
  min-height: 40px;
  transition: color var(--transition-base);
}

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

.footer-about-text {
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.5);
}

.footer-address {
  font-style: normal;
  margin-bottom: 1.25rem;
}

.contact-item {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 0.4rem;
}

.contact-item a {
  color: rgba(255,255,255,0.8);
  transition: color var(--transition-base);
}

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

.subscribe-label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  letter-spacing: 0.06em;
}

.subscribe-form {
  display: flex;
  gap: 0;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.subscribe-input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: none;
  padding: 0.6rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--c-white);
  outline: none;
  min-width: 0;
}

.subscribe-input::placeholder {
  color: rgba(255,255,255,0.3);
}

.subscribe-btn {
  background: var(--c-white);
  color: var(--c-dark);
  border: none;
  padding: 0.6rem 1rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base);
  white-space: nowrap;
  min-height: 40px;
}

.subscribe-btn:hover {
  background: var(--c-light);
}

/* 底栏 */
.footer-bottom {
  padding: 1.25rem 5vw;
}

.footer-bottom-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-copyright {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

.footer-bottom-links {
  display: flex;
  gap: 0;
}

.footer-bottom-links li a {
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
  padding: 0.4rem 0.75rem;
  min-height: 40px;
  transition: color var(--transition-base);
}

.footer-bottom-links li a:hover {
  color: var(--c-white);
}

/* ============================================================
   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);
  }

  .reveal-stagger {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.4s ease calc(var(--stagger, 0) * 0.08s),
                transform 0.4s ease calc(var(--stagger, 0) * 0.08s);
  }

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

/* ============================================================
   响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .layer-section {
    grid-template-columns: 1fr 240px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 120px;
  }

  .hero-visual {
    display: none;
  }

  .hero-inner {
    padding: 2rem 5vw 1.5rem;
  }

  .layer-section {
    grid-template-columns: 1fr;
  }

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

  .content-body {
    grid-column: 1;
    grid-row: 2;
  }

  .content-aside {
    grid-column: 1;
    grid-row: 3;
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .aside-card {
    flex: 1 1 240px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .header-inline-nav p {
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
  }

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

  .header-inline-nav p a {
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 1.6rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .cta-btn {
    width: 100%;
    justify-content: center;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .content-body section {
    padding: 1.25rem;
  }
}

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