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

/* ===== 变量 ===== */
:root {
  --mint: #b4fde1;
  --ice: #add8e6;
  --dark: #172620;
  --dark2: #1e3328;
  --dark3: #243d30;
  --mint-dim: #8ff5cc;
  --ice-dim: #88c8dc;
  --white: #f4fefa;
  --card-bg: #eafff6;
  --card-bg2: #e4f4fc;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --border: 3px solid var(--dark);
  --shadow-clay: 4px 4px 0px var(--dark), inset -2px -2px 8px rgba(0,0,0,0.12);
  --shadow-clay-mint: 4px 4px 0px var(--dark), inset -2px -2px 8px rgba(23,38,32,0.15);
  --shadow-hover: 6px 6px 0px var(--dark), inset -2px -2px 10px rgba(0,0,0,0.14);
  --font-code: 'Fira Code', 'Courier New', monospace;
  --font-sans: 'Fira Sans', system-ui, -apple-system, sans-serif;
  --nav-h: 64px;
  --transition: 200ms ease-out;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}
body {
  font-family: var(--font-sans);
  background: var(--dark);
  color: var(--dark);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  max-width: 100vw;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

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

/* ===== 整体包裹 ===== */
.page-wrap {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--dark);
  padding-bottom: var(--nav-h);
  overflow-x: hidden;
  max-width: 100%;
}

/* ===== 顶部 header ===== */
.site-header {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  border-bottom: var(--border);
  padding: 20px 16px 16px;
  overflow: hidden;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo { height: 40px; width: auto; }
.brand-text {
  font-family: var(--font-code);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.04em;
}
.header-tagline {
  font-size: 0.85rem;
  color: var(--ice-dim);
  font-family: var(--font-code);
  letter-spacing: 0.02em;
  opacity: 0.85;
}

/* ===== Hero ===== */
.hero-block {
  position: relative;
  min-height: 70vh;
  background: linear-gradient(160deg, var(--dark2) 0%, var(--dark3) 55%, #1a4030 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: var(--border);
  padding: 60px 16px 100px;
}
.hero-text-layer {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
  max-width: 680px;
  padding: 0 4px;
}
.hero-h1 {
  font-family: var(--font-code);
  font-size: clamp(1.4rem, 4.5vw, 2.6rem);
  font-weight: 700;
  color: var(--mint);
  line-height: 1.3;
  margin-bottom: 20px;
  text-shadow: 2px 2px 0 var(--dark);
  word-break: break-all;
}
.hero-sub {
  font-size: clamp(0.9rem, 2.2vw, 1.1rem);
  color: var(--ice);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  word-break: break-all;
}
.clay-btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--mint) 0%, var(--ice) 100%);
  color: var(--dark);
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  border: var(--border);
  box-shadow: var(--shadow-clay);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  letter-spacing: 0.04em;
  max-width: 100%;
  word-break: break-all;
}
.clay-btn:hover, .clay-btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
  outline: none;
}
.clay-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px var(--dark), inset -2px -2px 6px rgba(0,0,0,0.15);
}

/* bubbles */
.hero-deco { position: absolute; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }
.bubble {
  position: absolute;
  border-radius: 50%;
  opacity: 0.18;
}
.b1 {
  width: 240px; height: 240px;
  background: radial-gradient(circle, var(--mint) 0%, transparent 70%);
  top: -60px; right: -60px;
  animation: float1 6s ease-in-out infinite;
}
.b2 {
  width: 160px; height: 160px;
  background: radial-gradient(circle, var(--ice) 0%, transparent 70%);
  bottom: 20px; left: -40px;
  animation: float2 8s ease-in-out infinite;
}
.b3 {
  width: 100px; height: 100px;
  background: radial-gradient(circle, var(--mint) 0%, transparent 70%);
  top: 40%; left: 60%;
  animation: float1 5s ease-in-out infinite reverse;
}
@keyframes float1 {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}
@keyframes float2 {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(16px) scale(0.96); }
}

/* 斜切色带 */
.hero-slash {
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 60px;
  background: var(--dark);
  clip-path: polygon(0 60%, 100% 0%, 100% 100%, 0% 100%);
  z-index: 3;
}

/* ===== 主体内容 ===== */
main { background: var(--dark); overflow: hidden; }

.content-sections {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  grid-template-rows: auto 1fr;
  gap: 0 28px;
  max-width: 1060px;
  margin: 0 auto;
  padding: 48px 16px 64px;
  position: relative;
  overflow: hidden;
}

/* figure deco */
.content-figure-deco {
  grid-column: 1 / -1;
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
  pointer-events: none;
}
.fig-dot {
  display: inline-block;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 3px solid var(--mint);
  flex-shrink: 0;
}
.fd1 { background: var(--mint); box-shadow: 2px 2px 0 rgba(0,0,0,0.25); }
.fd2 { background: var(--ice); box-shadow: 2px 2px 0 rgba(0,0,0,0.2); }

/* aside */
.content-aside {
  grid-column: 2;
  grid-row: 2;
  align-self: start;
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  min-width: 0;
}
.aside-inner {
  background: linear-gradient(145deg, var(--card-bg) 0%, var(--card-bg2) 100%);
  border: var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-clay-mint);
  padding: 20px 16px;
}
.aside-eyebrow {
  display: block;
  font-family: var(--font-code);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--dark3);
  letter-spacing: 0.1em;
  margin-bottom: 6px;
  opacity: 0.7;
}
.aside-title {
  font-family: var(--font-code);
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  border-bottom: 2px solid var(--mint-dim);
  padding-bottom: 8px;
}
.aside-nav-list { display: flex; flex-direction: column; gap: 8px; }
.aside-link {
  display: block;
  font-family: var(--font-code);
  font-size: 0.82rem;
  color: var(--dark2);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  background: rgba(180,253,225,0.3);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  font-weight: 500;
  word-break: break-all;
}
.aside-link:hover {
  background: var(--mint);
  border-color: var(--dark);
  transform: translateX(4px);
}

/* main content area */
.main-content-area {
  grid-column: 1;
  grid-row: 2;
  min-width: 0;
  overflow: hidden;
}

/* ===== page.content 内部样式（section 块） ===== */
.main-content-area section {
  background: linear-gradient(145deg, var(--card-bg) 0%, #f0faff 100%);
  border: var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-clay-mint);
  padding: 28px 20px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}
.main-content-area section::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, var(--mint) 0%, var(--ice) 100%);
  border-radius: 4px 0 0 4px;
}
.main-content-area h2 {
  font-family: var(--font-code);
  font-size: clamp(1.05rem, 2.8vw, 1.45rem);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  line-height: 1.3;
  word-break: break-all;
}
.main-content-area h3 {
  font-family: var(--font-code);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark2);
  margin: 20px 0 10px;
  word-break: break-all;
}
.main-content-area p {
  font-size: 1rem;
  line-height: 1.75;
  color: #1a3028;
  margin-bottom: 14px;
  word-break: break-all;
}
.main-content-area ul,
.main-content-area ol {
  padding-left: 20px;
  margin-bottom: 14px;
}
.main-content-area ul { list-style: disc; }
.main-content-area ol { list-style: decimal; }
.main-content-area li {
  font-size: 1rem;
  line-height: 1.7;
  color: #1a3028;
  margin-bottom: 6px;
  word-break: break-all;
}
.main-content-area a {
  color: var(--dark2);
  border-bottom: 2px solid var(--mint-dim);
  transition: border-color var(--transition), color var(--transition);
  word-break: break-all;
}
.main-content-area a:hover {
  color: var(--dark);
  border-bottom-color: var(--dark);
}
.main-content-area strong { font-weight: 700; color: var(--dark); }
.main-content-area em { font-style: italic; color: var(--dark2); }
.main-content-area table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 14px;
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
}
.main-content-area th,
.main-content-area td {
  border: 2px solid var(--mint-dim);
  padding: 8px 12px;
  text-align: left;
  white-space: nowrap;
}
.main-content-area th {
  background: var(--mint);
  font-family: var(--font-code);
  font-weight: 700;
}
.main-content-area blockquote {
  border-left: 4px solid var(--mint);
  padding: 12px 16px;
  margin: 16px 0;
  background: rgba(180,253,225,0.2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  word-break: break-all;
}

/* small eyebrow before h2/h3 */
.main-content-area small {
  display: block;
  font-family: var(--font-code);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--dark3);
  opacity: 0.65;
  margin-bottom: 4px;
  text-transform: none;
}

/* clay card generic */
.clay-card {
  background: linear-gradient(145deg, var(--card-bg) 0%, var(--card-bg2) 100%);
  border: var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-clay-mint);
}

/* ===== 底部固定导航条 ===== */
.bottom-nav-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  width: 100%;
  height: var(--nav-h);
  background: linear-gradient(90deg, var(--dark2) 0%, var(--dark3) 100%);
  border-top: var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  z-index: 1000;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.35);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.bottom-nav-bar::-webkit-scrollbar { display: none; }

.bottom-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  padding: 0 8px;
  min-width: 40px;
  min-height: 40px;
  justify-content: center;
}
.bottom-logo-mark { height: 30px; width: auto; }
.bottom-brand-text {
  font-family: var(--font-code);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--mint);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.bottom-pills {
  display: flex;
  gap: 6px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  min-width: 0;
}
.bottom-pills::-webkit-scrollbar { display: none; }

.bottom-pill {
  display: flex;
  align-items: center;
  white-space: nowrap;
  font-family: var(--font-code);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ice);
  background: rgba(173,216,230,0.12);
  border: 2px solid rgba(173,216,230,0.3);
  border-radius: 999px;
  padding: 0 12px;
  min-height: 40px;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  flex-shrink: 0;
}
.bottom-pill:hover, .bottom-pill:focus-visible {
  background: rgba(180,253,225,0.2);
  border-color: var(--mint);
  color: var(--mint);
  outline: none;
}

.clay-btn-sm {
  display: flex;
  align-items: center;
  white-space: nowrap;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--mint) 0%, var(--ice) 100%);
  color: var(--dark);
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0 14px;
  min-height: 40px;
  border-radius: 999px;
  border: var(--border);
  box-shadow: 3px 3px 0px var(--dark), inset -1px -1px 5px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.clay-btn-sm:hover, .clay-btn-sm:focus-visible {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--dark), inset -1px -1px 5px rgba(0,0,0,0.1);
  outline: none;
}

/* ===== 页脚 ===== */
.site-footer {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  border-top: var(--border);
  padding: 36px 16px 28px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
  width: 100%;
  overflow: hidden;
}

.footer-nav { grid-column: 1; min-width: 0; }
.footer-dl {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer-dl dt,
.footer-dl dd { margin: 0; }
.footer-dl a {
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--ice-dim);
  padding: 4px 0;
  min-height: 40px;
  line-height: 1.4;
  display: flex;
  align-items: center;
  transition: color var(--transition);
  letter-spacing: 0.02em;
  word-break: break-all;
}
.footer-dl a:hover { color: var(--mint); }

.footer-brand-sec { grid-column: 2; min-width: 0; }
.footer-brand-name {
  font-family: var(--font-code);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--mint);
  margin-bottom: 10px;
  word-break: break-all;
}
.footer-desc {
  font-size: 0.8rem;
  color: var(--ice-dim);
  line-height: 1.65;
  opacity: 0.8;
  word-break: break-all;
}

.footer-copy-sec {
  grid-column: 3;
  text-align: right;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}
.footer-copy {
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--ice-dim);
  opacity: 0.65;
  word-break: break-all;
}
.footer-links {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 8px;
}
.footer-link {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--ice-dim);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.footer-link:hover { color: var(--mint); }
.footer-sep { color: var(--ice-dim); opacity: 0.4; }

/* ===== 导航 pill ===== */
.nav-pill {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

/* ===== Scroll reveal ===== */
@media (prefers-reduced-motion: no-preference) {
  .main-content-area section {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.5s ease-out, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  .main-content-area section.revealed {
    opacity: 1;
    transform: translateY(0);
  }
  .aside-inner {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.5s ease-out 0.2s, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s;
  }
  .aside-inner.revealed {
    opacity: 1;
    transform: translateX(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .main-content-area section,
  .aside-inner {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto; }
  .bubble { animation: none !important; }
  .clay-btn, .clay-btn-sm, .bottom-pill, .aside-link { transition: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .content-sections {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    padding: 28px 12px 48px;
    gap: 20px 0;
  }
  .content-figure-deco { grid-column: 1; }
  .main-content-area { grid-column: 1; grid-row: 2; }
  .content-aside { grid-column: 1; grid-row: 3; position: static; }
  .aside-inner { width: 100%; }

  .site-footer {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
    padding: 28px 12px 24px;
  }
  .footer-nav { grid-column: 1 / -1; }
  .footer-brand-sec { grid-column: 1; }
  .footer-copy-sec { grid-column: 2; }

  .hero-block { padding: 44px 12px 80px; min-height: 70vh; }

  .main-content-area section { padding: 20px 14px; }
}

@media (max-width: 480px) {
  .site-footer {
    grid-template-columns: 1fr;
    padding: 24px 12px 20px;
  }
  .footer-brand-sec { grid-column: 1; }
  .footer-copy-sec { grid-column: 1; text-align: left; }
  .footer-links { justify-content: flex-start; }

  .bottom-nav-bar { padding: 0 8px; gap: 5px; }
  .bottom-pill { padding: 0 9px; font-size: 0.68rem; }
  .clay-btn-sm { padding: 0 10px; font-size: 0.7rem; }

  .header-inner { flex-direction: column; align-items: flex-start; gap: 6px; }

  .hero-block { padding: 40px 10px 76px; }

  .content-sections { padding: 24px 10px 40px; }

  .main-content-area section { padding: 18px 12px; margin-bottom: 20px; }
}