@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap');

/* ============================================================
   CSS 变量 & 重置
============================================================ */
:root {
  --c-red: #ff0000;
  --c-purple: #8b00ff;
  --c-dark: #261717;
  --c-dark-alt: #1a0f0f;
  --c-dark-mid: #3a2020;
  --c-glass-bg: rgba(255,255,255,0.10);
  --c-glass-border: rgba(255,255,255,0.18);
  --c-glass-bg-hover: rgba(255,255,255,0.18);
  --c-text: #f0e8e8;
  --c-text-muted: rgba(240,232,232,0.65);
  --c-text-dim: rgba(240,232,232,0.42);
  --nav-w: 220px;
  --radius-card: 4px;
  --radius-md: 12px;
  --blur: 15px;
  --font: 'Roboto', system-ui, -apple-system, sans-serif;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--c-dark);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ============================================================
   磁场背景
============================================================ */
.mag-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.mag-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,0,0,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,0,0,0.07) 1px, transparent 1px);
  background-size: 48px 48px;
}

.mag-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: orbFloat 12s ease-in-out infinite alternate;
}

.mag-orb--red {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #ff0000 0%, transparent 70%);
  top: -180px;
  right: -120px;
  animation-delay: 0s;
}

.mag-orb--purple {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #8b00ff 0%, transparent 70%);
  bottom: -150px;
  left: 10%;
  animation-delay: -5s;
}

@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

@media (prefers-reduced-motion: reduce) {
  .mag-orb { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   左侧固定导航 (Header)
============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.25rem;
  background: rgba(38,23,23,0.75);
  -webkit-backdrop-filter: blur(var(--blur));
  backdrop-filter: blur(var(--blur));
  border-right: 1px solid var(--c-glass-border);
  gap: 1.5rem;
  overflow-y: auto;
}

.site-header__brand {
  flex-shrink: 0;
}

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

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--c-red), var(--c-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-logo { max-height: 40px; width: auto; }

/* 导航 dl */
.site-header__nav { flex: 1; }

.nav-dl {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-dt {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

.nav-dl dd a {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--c-text-muted);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.nav-dl dd a:hover,
.nav-dl dd a:focus-visible {
  background: var(--c-glass-bg-hover);
  color: var(--c-text);
}

/* CTA 按钮 */
.site-header__cta { flex-shrink: 0; }

.btn-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--c-red), var(--c-purple));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: opacity var(--transition), transform var(--transition);
}

.btn-cta:hover { opacity: 0.88; transform: translateY(-1px); }

/* ============================================================
   主内容偏移
============================================================ */
main,
.site-footer {
  margin-left: var(--nav-w);
  position: relative;
  z-index: 1;
}

/* ============================================================
   Hero Section
============================================================ */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  scroll-margin-top: 0;
}

.hero-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 3rem 4rem;
  display: grid;
  grid-template-columns: 200px 1fr 280px;
  gap: 2.5rem;
  align-items: center;
}

/* Hero Aside */
.hero-aside {
  display: flex;
  flex-direction: column;
}

.aside-glass {
  background: var(--c-glass-bg);
  -webkit-backdrop-filter: blur(var(--blur));
  backdrop-filter: blur(var(--blur));
  border: 1px solid var(--c-glass-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
}

.aside-glass--sm {
  padding: 1rem 0.85rem;
}

.aside-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-red);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.aside-tips {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.aside-tips li {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  padding-left: 0.75rem;
  border-left: 2px solid var(--c-purple);
}

/* Hero Content */
.hero-content { display: flex; flex-direction: column; gap: 1.25rem; }

.hero-h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  background: linear-gradient(135deg, #fff 30%, var(--c-red) 70%, var(--c-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  max-width: 520px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--c-red), var(--c-purple));
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 24px rgba(255,0,0,0.25);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(139,0,255,0.35);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.4rem;
  border-radius: 6px;
  border: 1px solid var(--c-glass-border);
  background: var(--c-glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--c-text);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition);
}

.btn-ghost:hover {
  background: var(--c-glass-bg-hover);
  border-color: rgba(255,255,255,0.32);
}

/* Hero Media Cards */
.hero-media {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
}

.hero-card {
  padding: 1.25rem 1rem;
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.hero-card--top { transform: translateX(20px); }
.hero-card--bot { transform: translateX(-20px); }

.glass-card {
  background: var(--c-glass-bg);
  -webkit-backdrop-filter: blur(var(--blur));
  backdrop-filter: blur(var(--blur));
  border: 1px solid var(--c-glass-border);
  border-bottom: 3px solid var(--c-red);
  border-radius: var(--radius-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
  transform: translateY(-4px) !important;
  box-shadow: 0 12px 40px rgba(255,0,0,0.18);
}

.hc-icon { font-size: 1.5rem; }
.hc-label { font-size: 0.75rem; color: var(--c-text-dim); font-weight: 500; }
.hc-val { font-size: 1rem; font-weight: 700; color: var(--c-text); }

/* ============================================================
   正文区
============================================================ */
.content-section {
  scroll-margin-top: 0;
}

.content-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 3rem 4rem;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2.5rem;
  align-items: start;
}

/* 正文侧边 aside */
.content-aside {
  position: sticky;
  top: 2rem;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.aside-nav-list li a {
  display: block;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  padding: 0.35rem 0.6rem;
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  min-height: 32px;
  display: flex;
  align-items: center;
}

.aside-nav-list li a:hover {
  color: var(--c-text);
  border-left-color: var(--c-red);
}

/* 正文内容 */
.content-main { min-width: 0; }

/* page.content 内部的 div 样式 */
.content-main div {
  scroll-margin-top: 2rem;
  padding: 3rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.content-main div:last-child { border-bottom: none; }

.content-main h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 1.25rem;
  line-height: 1.3;
  background: linear-gradient(135deg, var(--c-text) 60%, var(--c-red));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content-main h2 span {
  background: inherit;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content-main h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--c-text);
}

.content-main h3 span {
  color: inherit;
}

.content-main p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text-muted);
  margin-bottom: 1rem;
}

.content-main ul,
.content-main ol {
  margin: 0.75rem 0 1rem 1.25rem;
  list-style: disc;
}

.content-main ol { list-style: decimal; }

.content-main li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text-muted);
  margin-bottom: 0.4rem;
}

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

.content-main a {
  color: #ff6666;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

.content-main a:hover { color: var(--c-red); }

.content-main blockquote {
  border-left: 3px solid var(--c-purple);
  padding: 0.75rem 1.25rem;
  background: var(--c-glass-bg);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  margin: 1rem 0;
  color: var(--c-text-muted);
  font-style: italic;
}

.content-main table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.92rem;
}

.content-main th,
.content-main td {
  padding: 0.65rem 1rem;
  border: 1px solid rgba(255,255,255,0.1);
  text-align: left;
  color: var(--c-text-muted);
}

.content-main th {
  background: rgba(255,0,0,0.12);
  color: var(--c-text);
  font-weight: 600;
}

/* Stagger list animation */
@media (prefers-reduced-motion: no-preference) {
  .content-main li {
    animation: fadeUp 0.4s ease both;
  }
  .content-main li:nth-child(1) { animation-delay: 0.05s; }
  .content-main li:nth-child(2) { animation-delay: 0.10s; }
  .content-main li:nth-child(3) { animation-delay: 0.15s; }
  .content-main li:nth-child(4) { animation-delay: 0.20s; }
  .content-main li:nth-child(5) { animation-delay: 0.25s; }
  .content-main li:nth-child(6) { animation-delay: 0.30s; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Parallax effect for hero */
@media (prefers-reduced-motion: no-preference) {
  .hero-media {
    transition: transform 0.1s linear;
  }
}

/* ============================================================
   页脚
============================================================ */
.site-footer {
  background: rgba(26,15,15,0.92);
  -webkit-backdrop-filter: blur(var(--blur));
  backdrop-filter: blur(var(--blur));
  border-top: 1px solid var(--c-glass-border);
  position: relative;
  z-index: 2;
}

.footer-cta-block {
  text-align: center;
  padding: 4rem 2rem 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  background: linear-gradient(180deg, rgba(255,0,0,0.06) 0%, transparent 100%);
}

.footer-cta-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--c-text), var(--c-red));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-cta-title span {
  background: inherit;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-cta-desc {
  font-size: 1rem;
  color: var(--c-text-muted);
  margin-bottom: 1.5rem;
}

/* 页脚三栏 */
.footer-cols {
  padding: 2.5rem 3rem;
}

.footer-cols nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-dl dt {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-red);
  margin-bottom: 0.75rem;
}

.footer-dl dd {
  margin-bottom: 0.45rem;
}

.footer-dl dd a {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}

.footer-dl dd a:hover { color: var(--c-text); }

.footer-info {
  font-size: 0.88rem;
  color: var(--c-text-dim);
}

.footer-bar {
  padding: 1.25rem 3rem;
  border-top: 1px solid rgba(255,255,255,0.07);
  font-size: 0.8rem;
  color: var(--c-text-dim);
  text-align: center;
}

/* ============================================================
   Scroll margin for sections inside page.content
============================================================ */
div[id] {
  scroll-margin-top: 2rem;
}

/* ============================================================
   Focus visible
============================================================ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--c-red);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
   响应式
============================================================ */
@media (max-width: 960px) {
  :root { --nav-w: 0px; }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 0.75rem 1.25rem;
    border-right: none;
    border-bottom: 1px solid var(--c-glass-border);
    overflow-y: visible;
    gap: 0;
    z-index: 200;
  }

  .site-header__brand { flex: 0 0 auto; }

  .site-header__nav {
    flex: 1;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 0.5rem;
  }

  .nav-dl {
    flex-direction: row;
    align-items: center;
    gap: 0;
    flex-wrap: nowrap;
  }

  .nav-dt { display: none; }

  .nav-dl dd a {
    white-space: nowrap;
    padding: 0.5rem 0.6rem;
    font-size: 0.82rem;
  }

  .site-header__cta { flex: 0 0 auto; }

  .btn-cta {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.82rem;
    white-space: nowrap;
  }

  main, .site-footer {
    margin-left: 0;
    padding-top: 64px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    padding: 3rem 1.5rem 2.5rem;
    gap: 2rem;
  }

  .hero-aside { display: none; }

  .hero-media {
    flex-direction: row;
    justify-content: center;
  }

  .hero-card--top,
  .hero-card--bot { transform: none; }

  .content-wrap {
    grid-template-columns: 1fr;
    padding: 2rem 1.5rem 3rem;
    gap: 1.5rem;
  }

  .content-aside { display: none; }

  .footer-cols { padding: 2rem 1.5rem; }

  .footer-cols nav {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .footer-bar { padding: 1rem 1.5rem; }
}

@media (max-width: 600px) {
  .hero-h1 { font-size: 1.6rem; }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-primary,
  .btn-ghost {
    width: 100%;
    justify-content: center;
  }

  .hero-media {
    flex-direction: column;
    align-items: center;
  }

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

  .footer-cta-block { padding: 2.5rem 1.25rem 2rem; }
}

@media (max-width: 375px) {
  .nav-dl dd a { padding: 0.5rem 0.4rem; font-size: 0.78rem; }
  .hero-inner { padding: 2.5rem 1rem 2rem; }
  .content-wrap { padding: 1.5rem 1rem 2rem; }
}

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