@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Orbitron:wght@700;900&display=swap');

:root {
  --mint: #b4fde1;
  --sky: #add8e6;
  --ink: #172620;
  --ink-2: #1e332b;
  --line: rgba(180, 253, 225, 0.35);
  --txt: #e6fbf2;
  --dim: #9dbcb0;
  --r: 18px;
  --mono: 'JetBrains Mono', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', ui-monospace, monospace;
  --disp: 'Orbitron', 'JetBrains Mono', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ease: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--ink);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--txt);
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 1px 1px, rgba(180, 253, 225, 0.16) 1px, transparent 0),
    radial-gradient(900px 620px at 82% -8%, rgba(173, 216, 230, 0.22), transparent 62%),
    radial-gradient(720px 540px at 6% 104%, rgba(180, 253, 225, 0.16), transparent 58%);
  background-size: 22px 22px, auto, auto;
  background-attachment: fixed;
}

a {
  color: var(--mint);
}

img {
  max-width: 100%;
}

/* ---------- 顶部细条 ---------- */
.announce {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 22px;
  font-family: var(--disp);
  font-size: 15px;
  letter-spacing: 0.22em;
  color: var(--ink);
  background: linear-gradient(100deg, var(--mint), var(--sky));
  border-bottom: 3px solid rgba(23, 38, 32, 0.55);
  box-shadow: 0 6px 0 rgba(180, 253, 225, 0.12), 0 12px 24px rgba(0, 0, 0, 0.35);
}

/* ---------- 左侧竖排导航 ---------- */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: 244px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 18px;
  overflow-y: auto;
  background: linear-gradient(180deg, rgba(30, 51, 43, 0.97), rgba(23, 38, 32, 0.99));
  border-right: 3px solid var(--line);
  box-shadow: inset -8px 0 20px rgba(0, 0, 0, 0.42), 10px 0 28px rgba(0, 0, 0, 0.45);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 6px 8px;
  border-radius: 14px;
  text-decoration: none;
  color: var(--mint);
  font-family: var(--disp);
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: 0.06em;
  text-shadow: 0 0 14px rgba(180, 253, 225, 0.55);
}

.mark {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border-radius: 12px;
  border: 3px solid var(--line);
  object-fit: cover;
  box-shadow: inset -2px -3px 8px rgba(23, 38, 32, 0.4), 4px 4px 10px rgba(0, 0, 0, 0.45);
}

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

.rail-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: 14px;
  border: 3px solid transparent;
  color: var(--txt);
  font-size: 16px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.2s ease-out, background 0.2s ease-out, transform 0.2s var(--ease);
}

.rail-link:hover,
.rail-link:focus-visible,
.rail-link.is-on {
  border-color: rgba(180, 253, 225, 0.6);
  color: #ffffff;
  background: linear-gradient(140deg, rgba(180, 253, 225, 0.24), rgba(173, 216, 230, 0.14));
  box-shadow: inset -2px -3px 8px rgba(0, 0, 0, 0.32), 0 5px 12px rgba(0, 0, 0, 0.32);
}

.rail-link:active {
  transform: translateY(2px);
}

/* ---------- 主体 ---------- */
.stage {
  margin-left: 244px;
  min-height: 100vh;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: center;
  min-height: calc(100vh - 44px);
  padding: clamp(26px, 5vw, 64px) clamp(18px, 4vw, 56px);
  background-image:
    linear-gradient(rgba(180, 253, 225, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(180, 253, 225, 0.075) 1px, transparent 1px);
  background-size: 46px 46px;
}

.hero-art {
  margin: 0;
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  border-radius: 26px;
  border: 4px solid rgba(180, 253, 225, 0.55);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(173, 216, 230, 0.34), rgba(180, 253, 225, 0.18) 55%, rgba(23, 38, 32, 0.55));
  box-shadow:
    inset -4px -6px 16px rgba(23, 38, 32, 0.55),
    inset 4px 6px 14px rgba(255, 255, 255, 0.22),
    10px 12px 0 rgba(180, 253, 225, 0.14),
    0 22px 42px rgba(0, 0, 0, 0.45);
  animation: bob 7s ease-in-out infinite;
}

.hero-img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.blob {
  display: grid;
  gap: 14px;
  place-items: center;
}

.blob i {
  display: block;
  border-radius: 50%;
  border: 3px solid var(--line);
  background: radial-gradient(circle at 30% 28%, #ffffff, var(--mint) 46%, #6ed6b2);
  box-shadow: inset -3px -4px 10px rgba(23, 38, 32, 0.35), 0 8px 18px rgba(0, 0, 0, 0.38);
}

.blob i:nth-child(1) {
  width: 88px;
  height: 88px;
}

.blob i:nth-child(2) {
  width: 54px;
  height: 54px;
  background: radial-gradient(circle at 30% 28%, #ffffff, var(--sky) 46%, #74b2ca);
}

.blob i:nth-child(3) {
  width: 32px;
  height: 32px;
}

@keyframes bob {
  50% {
    transform: translateY(-10px);
  }
}

.hero-copy {
  text-align: center;
}

.hero-copy h1 {
  margin: 0 0 0.55em;
  font-size: clamp(28px, 4.4vw, 52px);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: #f4fffb;
  text-shadow: 0 0 20px rgba(180, 253, 225, 0.5);
}

.lede {
  margin: 0 auto 26px;
  max-width: 34ch;
  color: var(--dim);
  font-size: 17px;
}

.jump {
  display: inline-flex;
  align-items: center;
  min-height: 50px;
  padding: 0 26px;
  border-radius: 16px;
  border: 3px solid rgba(23, 38, 32, 0.55);
  background: linear-gradient(150deg, var(--mint), #8ce4c2);
  color: var(--ink);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.08em;
  text-decoration: none;
  box-shadow:
    inset -3px -4px 10px rgba(23, 38, 32, 0.26),
    inset 3px 4px 8px rgba(255, 255, 255, 0.5),
    5px 6px 0 rgba(180, 253, 225, 0.18),
    0 12px 22px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s var(--ease);
}

.jump:active {
  transform: translateY(3px);
}

/* ---------- 正文与侧栏 ---------- */
.read {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 286px;
  gap: clamp(18px, 3vw, 40px);
  align-items: start;
  max-width: 1220px;
  margin: 0 auto;
  padding: clamp(22px, 4vw, 52px) clamp(16px, 4vw, 56px) 44px;
}

.body {
  min-width: 0;
}

.body > section {
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 34px);
  border-radius: 22px;
  border: 3px solid rgba(180, 253, 225, 0.22);
  background: linear-gradient(160deg, rgba(30, 51, 43, 0.82), rgba(23, 38, 32, 0.9));
  box-shadow: inset -3px -4px 14px rgba(0, 0, 0, 0.36), 0 14px 28px rgba(0, 0, 0, 0.28);
}

.body section[id] {
  scroll-margin-top: 82px;
}

.body h2 {
  margin: 0.1em 0 0.6em;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.36;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.body h3 {
  margin: 1.5em 0 0.5em;
  font-size: 19px;
  line-height: 1.45;
  color: var(--sky);
}

.body p {
  margin: 0 0 1em;
}

.body ul,
.body ol {
  padding-left: 1.35em;
}

.body li {
  margin: 0.4em 0;
}

.body hr {
  height: 3px;
  margin: 1.1em 0;
  border: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--mint), transparent);
}

.body blockquote {
  margin: 1.1em 0;
  padding: 12px 18px;
  border-radius: 14px;
  border: 3px solid rgba(173, 216, 230, 0.35);
  background: rgba(173, 216, 230, 0.1);
  color: var(--dim);
}

.body img {
  height: auto;
  border-radius: 16px;
  border: 3px solid rgba(180, 253, 225, 0.3);
}

.body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

.body th,
.body td {
  padding: 8px 10px;
  border: 2px solid rgba(180, 253, 225, 0.2);
  text-align: left;
}

.side {
  position: sticky;
  top: 76px;
  padding: 20px 18px;
  border-radius: 20px;
  border: 3px solid rgba(173, 216, 230, 0.42);
  background: linear-gradient(160deg, rgba(173, 216, 230, 0.18), rgba(23, 38, 32, 0.82));
  box-shadow:
    inset -3px -4px 12px rgba(0, 0, 0, 0.4),
    inset 3px 4px 10px rgba(255, 255, 255, 0.1),
    6px 8px 0 rgba(173, 216, 230, 0.12),
    0 16px 30px rgba(0, 0, 0, 0.34);
}

.side h2 {
  margin: 0 0 10px;
  font-family: var(--disp);
  font-size: 16px;
  letter-spacing: 0.2em;
  color: var(--sky);
}

.side hr {
  height: 3px;
  margin: 0 0 12px;
  border: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--sky), transparent);
}

.side ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 5px;
}

.side li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 12px;
  border-radius: 12px;
  border: 3px solid transparent;
  color: var(--txt);
  font-size: 16px;
  text-decoration: none;
  transition: background 0.2s ease-out, border-color 0.2s ease-out;
}

.side li a:hover,
.side li a:focus-visible {
  border-color: rgba(173, 216, 230, 0.55);
  background: rgba(173, 216, 230, 0.16);
  color: #ffffff;
}

/* ---------- 页脚 ---------- */
.foot {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  max-width: 1220px;
  margin: 8px auto 0;
  padding: clamp(24px, 4vw, 44px) clamp(18px, 4vw, 44px) 22px;
  border: 3px solid rgba(180, 253, 225, 0.28);
  border-bottom: 0;
  border-radius: 26px 26px 0 0;
  background: linear-gradient(160deg, rgba(30, 51, 43, 0.94), rgba(23, 38, 32, 0.98));
  box-shadow: inset 0 6px 18px rgba(0, 0, 0, 0.32);
}

.foot-brand {
  min-width: 0;
}

.foot-home {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 6px;
  border-radius: 14px;
  text-decoration: none;
  color: var(--mint);
  font-family: var(--disp);
  font-size: 16px;
  letter-spacing: 0.06em;
}

.foot nav dl {
  margin: 0;
}

.foot dt {
  margin: 0 0 8px;
  font-family: var(--disp);
  font-size: 15px;
  letter-spacing: 0.22em;
  color: var(--mint);
}

.foot dd {
  margin: 0;
}

.foot dd a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 4px 10px;
  border-radius: 12px;
  color: var(--dim);
  font-size: 16px;
  text-decoration: none;
  transition: color 0.2s ease-out, background 0.2s ease-out;
}

.foot dd a:hover,
.foot dd a:focus-visible {
  color: #ffffff;
  background: rgba(180, 253, 225, 0.14);
}

.foot-act {
  display: flex;
  align-items: flex-start;
}

.to-top {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 14px;
  border: 3px solid rgba(180, 253, 225, 0.55);
  background: linear-gradient(150deg, var(--mint), #86e2c0);
  color: var(--ink);
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  box-shadow: inset -2px -3px 8px rgba(23, 38, 32, 0.3), 4px 5px 0 rgba(180, 253, 225, 0.16), 0 10px 20px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s var(--ease);
}

.to-top:active {
  transform: translateY(3px);
}

.colophon {
  grid-column: 1 / -1;
  padding-top: 14px;
  border-top: 3px dashed rgba(180, 253, 225, 0.22);
  color: var(--dim);
  font-size: 15px;
}

.colophon p {
  margin: 0;
}

/* ---------- 动效 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(20px);
}

.js .reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity 0.5s ease-out, transform 0.55s var(--ease);
}

/* ---------- 断点 ---------- */
@media (max-width: 1000px) {
  .read {
    grid-template-columns: minmax(0, 1fr) 250px;
  }
}

@media (max-width: 900px) {
  .rail {
    position: static;
    inset: auto;
    width: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    overflow: visible;
    border-right: 0;
    border-bottom: 3px solid var(--line);
    box-shadow: inset 0 -6px 16px rgba(0, 0, 0, 0.3);
  }

  .rail-nav {
    flex: 1 1 100%;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .rail-link {
    flex: 0 1 auto;
    padding: 6px 12px;
  }

  .stage {
    margin-left: 0;
  }

  .announce {
    position: static;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
    padding-top: 22px;
    padding-bottom: 8px;
    background-size: 34px 34px;
  }

  .hero-copy {
    order: 1;
  }

  .hero-art {
    order: 2;
    aspect-ratio: 16 / 10;
  }

  .read {
    grid-template-columns: minmax(0, 1fr);
  }

  .side {
    position: static;
    order: 2;
  }

  .foot {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 17px;
  }

  .hero-copy h1 {
    font-size: 30px;
  }

  .foot {
    grid-template-columns: 1fr;
    border-radius: 22px 22px 0 0;
  }

  .body > section {
    padding: 18px 16px;
    border-radius: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

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