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

:root {
  --black: #000000;
  --panel: #121212;
  --line: rgba(255, 255, 255, 0.09);
  --line-soft: rgba(255, 255, 255, 0.05);
  --text: #E6EAF4;
  --body-text: #C6CFE2;
  --muted: #93A0BC;
  --blue: #4A6BFF;
  --blue-soft: rgba(74, 107, 255, 0.16);
  --glow: rgba(74, 107, 255, 0.35);
  --radius: 10px;
  --rail: 280px;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding-left: var(--rail);
  background: var(--black);
  color: var(--text);
  font-family: Quicksand, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: 0.01em;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 左侧固定竖排导航 ---------- */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  width: var(--rail);
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 26px 20px;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, #080B12 0%, #000000 62%);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 4px;
  text-decoration: none;
}

.brand-mark {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: radial-gradient(circle at 32% 30%, var(--blue), #0B1230 78%);
  box-shadow: 0 0 14px var(--glow);
}

.brand-logo {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 8px;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-shadow: 0 0 12px rgba(74, 107, 255, 0.28);
}

.rail-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  font-size: 16px;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.rail-nav a:hover,
.rail-nav a:focus-visible {
  color: #FFFFFF;
  background: var(--blue-soft);
  transform: translateX(3px);
  box-shadow: inset 0 0 0 1px rgba(74, 107, 255, 0.3);
}

.rail-nav a.is-on {
  color: #FFFFFF;
  background: linear-gradient(90deg, rgba(74, 107, 255, 0.22), rgba(74, 107, 255, 0));
  box-shadow: inset 2px 0 0 var(--blue);
}

.ico {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  opacity: 0.72;
}

.rail-cta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid rgba(96, 126, 255, 0.45);
  background: linear-gradient(140deg, #2B3FB8, #101A44);
  box-shadow: 0 0 22px rgba(74, 107, 255, 0.22);
  color: #FFFFFF;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.rail-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(74, 107, 255, 0.45);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 32px;
  min-height: 100vh;
  min-height: 100svh;
  padding: 96px 40px 0;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -14% -20% auto -20%;
  height: 62%;
  background: radial-gradient(58% 62% at 26% 22%, rgba(74, 107, 255, 0.22), transparent 72%);
  pointer-events: none;
}

.hero-text {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 22px;
}

.hero h1 {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(2rem, 5.4vw, 4rem);
  line-height: 1.14;
  letter-spacing: -0.012em;
  text-shadow: 0 0 26px rgba(74, 107, 255, 0.3);
}

.hero-jump {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 9px 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(8px);
  color: var(--text);
  font-size: 16px;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.hero-jump:hover {
  border-color: rgba(74, 107, 255, 0.6);
  transform: translateY(2px);
}

.hero-fig {
  position: relative;
  flex: 1 1 auto;
  min-height: 34vh;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(180deg, #0A0E18, #000000);
}

.hero-fig img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  will-change: transform;
}

.hero-fig::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 55%;
  background: linear-gradient(180deg, transparent, #000000);
  pointer-events: none;
}

/* ---------- 正文 + 右侧栏 ---------- */
.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
  align-items: start;
  gap: 44px;
  padding: 70px 40px 92px;
}

.prose {
  min-width: 0;
}

.prose > article {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.prose > article:first-child {
  padding-top: 0;
  border-top: 0;
}

.prose h2 {
  margin: 0.25em 0 0.75em;
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  text-shadow: 0 0 16px rgba(74, 107, 255, 0.2);
}

.prose h3 {
  margin: 1.6em 0 0.6em;
  font-size: 1.16rem;
  color: #FFFFFF;
}

.prose p {
  margin: 0 0 1.1em;
  color: var(--body-text);
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.3em;
  color: var(--body-text);
}

.prose li {
  margin: 0.45em 0;
}

.prose a {
  color: #9DB2FF;
  text-decoration-color: rgba(157, 178, 255, 0.4);
  text-underline-offset: 3px;
}

.prose a:hover {
  color: #FFFFFF;
}

.prose figure {
  margin: 1.5em 0;
}

.prose img,
.prose figure img {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  height: auto;
}

.prose blockquote {
  margin: 1.5em 0;
  padding: 14px 18px;
  border-left: 2px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
}

.prose strong {
  color: #FFFFFF;
}

.prose hr {
  margin: 2em 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.eyebrow,
.prose small {
  display: block;
  margin-bottom: 2px;
  font-family: Caveat, Quicksand, sans-serif;
  font-size: 17px;
  letter-spacing: 0.14em;
  color: var(--blue);
  text-shadow: 0 0 10px rgba(74, 107, 255, 0.4);
}

.side {
  position: sticky;
  top: 104px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.015));
  backdrop-filter: blur(12px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55);
}

.side-title {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.side-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px;
  border-bottom: 1px solid var(--line-soft);
  border-radius: 8px;
  color: var(--muted);
  font-size: 16px;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, padding-left 0.2s ease;
}

.side-list a:hover {
  padding-left: 14px;
  color: #FFFFFF;
  background: var(--blue-soft);
}

/* ---------- 页脚 ---------- */
.foot {
  padding: 20px 40px 44px;
}

.foot-cta {
  padding: 52px 26px;
  border: 1px solid rgba(74, 107, 255, 0.28);
  border-radius: var(--radius);
  background: radial-gradient(82% 130% at 50% 0%, rgba(74, 107, 255, 0.22), rgba(18, 18, 18, 0.92) 72%);
  box-shadow: inset 0 0 60px rgba(74, 107, 255, 0.14);
  text-align: center;
}

.foot-cta h2 {
  margin: 0 0 22px;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  text-shadow: 0 0 20px rgba(74, 107, 255, 0.3);
}

.foot-btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 34px;
  border: 1px solid rgba(120, 145, 255, 0.5);
  border-radius: 999px;
  background: linear-gradient(140deg, #2B3FB8, #0E1740);
  box-shadow: 0 0 26px rgba(74, 107, 255, 0.32);
  color: #FFFFFF;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.foot-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(74, 107, 255, 0.55);
}

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 20px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 16px;
}

.foot-bar p {
  margin: 0;
}

.foot-bar a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 6px;
  color: var(--muted);
  text-decoration: none;
}

.foot-bar a:hover {
  color: #FFFFFF;
}

/* ---------- 断点 ---------- */
@media (max-width: 1180px) {
  .stage {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .side {
    position: static;
  }
}

@media (max-width: 1023px) {
  body {
    padding-left: 0;
  }

  .rail {
    position: sticky;
    inset: auto;
    top: 0;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    padding: 10px 14px 12px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(0, 0, 0, 0.88);
    backdrop-filter: blur(14px);
  }

  .brand {
    min-height: 44px;
    padding: 0;
  }

  .rail-cta {
    margin: 0 0 0 auto;
    min-height: 44px;
    padding: 8px 16px;
    font-size: 16px;
  }

  .rail-nav {
    order: 3;
    width: 100%;
    margin-top: 2px;
  }

  .rail-nav ul {
    flex-direction: row;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: 2px;
  }

  .rail-nav ul::-webkit-scrollbar {
    display: none;
  }

  .rail-nav a {
    padding: 8px 12px;
    white-space: nowrap;
    transform: none;
  }

  .rail-nav a:hover {
    transform: none;
  }

  .hero {
    gap: 26px;
    min-height: auto;
    padding: 54px 18px 0;
  }

  .hero h1 {
    max-width: none;
  }

  .hero-fig {
    min-height: 42vh;
  }

  .stage {
    padding: 44px 18px 64px;
  }

  .foot {
    padding: 16px 18px 36px;
  }

  .foot-cta {
    padding: 40px 18px;
  }

  .prose > article {
    scroll-margin-top: 138px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .hero h1 {
    font-size: clamp(1.75rem, 8.4vw, 2.4rem);
  }

  .prose h2 {
    font-size: 1.35rem;
  }

  .prose > article {
    padding: 34px 0;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }

  .hero-fig img {
    transform: none !important;
  }
}

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