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

/* ===== 基础变量 ===== */
:root {
  --green: #69ff69;
  --cyan: #00ffff;
  --dark: #172617;
  --dark2: #0d1a0d;
  --dark3: #1e331e;
  --mid: #2a3d2a;
  --text: #d8f0d8;
  --text-dim: #8aaa8a;
  --white: #ffffff;
  --chrome1: #c8e8c8;
  --chrome2: #a0c8a0;
  --card-radius: 28px;
  --nav-h: 64px;
  --font-head: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --glow-green: 0 0 12px #69ff69, 0 0 28px #69ff6960;
  --glow-cyan: 0 0 12px #00ffff, 0 0 28px #00ffff60;
  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--dark2);
}
body, .y2k-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--dark2);
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--green); }
img { max-width: 100%; height: auto; display: block; }
ul, menu { list-style: none; }

/* ===== scroll-margin for fixed nav ===== */
article[id] { scroll-margin-top: calc(var(--nav-h) + 12px); }

/* ===== Site Wrapper ===== */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: var(--nav-h);
}

/* ===== Bottom Fixed Nav ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
}

.nav-details {
  position: relative;
  height: 100%;
}

.nav-summary {
  display: block;
  list-style: none;
  height: var(--nav-h);
  background: linear-gradient(90deg, var(--dark3) 0%, #1a2e1a 50%, var(--dark3) 100%);
  border-top: 1.5px solid var(--green);
  box-shadow: 0 -2px 24px #69ff6930;
  cursor: pointer;
  user-select: none;
}
.nav-summary::-webkit-details-marker { display: none; }

.nav-bar-inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 20px;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  min-width: 40px;
  min-height: 40px;
  padding: 4px;
}
.logo-mark { width: 40px; height: 40px; object-fit: contain; }
.logo-text-icon {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--green);
  text-shadow: var(--glow-green);
  letter-spacing: 0.04em;
}

.hamburger-icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 8px;
  cursor: pointer;
}
.hamburger-icon span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--green);
  border-radius: 2px;
  box-shadow: var(--glow-green);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Open state hamburger */
.nav-details[open] .hamburger-icon span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-details[open] .hamburger-icon span:nth-child(2) { opacity: 0; }
.nav-details[open] .hamburger-icon span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Full-screen overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  bottom: var(--nav-h);
  background: linear-gradient(160deg, var(--dark2) 0%, #0a150a 60%, #001a1a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: overlayIn 0.28s ease forwards;
  overflow-y: auto;
}
@keyframes overlayIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-overlay-inner {
  width: 100%;
  max-width: 520px;
  padding: 40px 28px;
  text-align: center;
}

.nav-overlay-brand {
  margin-bottom: 36px;
}
.brand-large {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 8vw, 4rem);
  font-weight: 700;
  color: transparent;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 18px #69ff6980);
  letter-spacing: 0.06em;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nav-menu li a {
  display: block;
  padding: 14px 24px;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text);
  border-radius: 12px;
  border: 1px solid transparent;
  min-height: 48px;
  transition: all var(--transition);
  letter-spacing: 0.03em;
}
.nav-menu li a:hover {
  color: var(--green);
  border-color: var(--green);
  background: #69ff6912;
  text-shadow: var(--glow-green);
  transform: translateX(6px);
}

.nav-close-btn {
  display: inline-block;
  margin-top: 32px;
  padding: 12px 32px;
  border: 1.5px solid var(--cyan);
  border-radius: 24px;
  color: var(--cyan);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
}
.nav-close-btn:hover {
  background: var(--cyan);
  color: var(--dark2);
}

/* ===== Hero ===== */
.hero-header {
  position: relative;
  min-height: 45vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 56px 24px 0;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  padding-bottom: 32px;
}

.hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
  margin-bottom: 16px;
  text-shadow: 0 0 32px #69ff6950;
}
.hero-h1 strong {
  color: var(--green);
  text-shadow: var(--glow-green);
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 480px;
  margin-bottom: 28px;
  line-height: 1.7;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 28px;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--green) 0%, var(--cyan) 100%);
  color: var(--dark2);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  box-shadow: 0 0 20px #69ff6960;
  transition: all var(--transition);
  border: none;
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px #69ff69a0, 0 6px 20px #00000060;
  color: var(--dark2);
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.hero-chrome-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--green), var(--cyan), var(--green), transparent);
  opacity: 0.7;
}

.hero-glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.18;
  animation: orbPulse 6s ease-in-out infinite;
}
.orb-green {
  width: 320px; height: 320px;
  background: var(--green);
  top: -80px; right: 10%;
  animation-delay: 0s;
}
.orb-cyan {
  width: 240px; height: 240px;
  background: var(--cyan);
  top: 20%; right: 30%;
  animation-delay: -3s;
}
@keyframes orbPulse {
  0%, 100% { transform: scale(1); opacity: 0.18; }
  50% { transform: scale(1.15); opacity: 0.28; }
}

.hero-grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(0deg, transparent 24px, #69ff6908 25px, transparent 26px),
    linear-gradient(90deg, transparent 24px, #69ff6906 25px, transparent 26px);
  background-size: 50px 50px;
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  padding: 40px 0 60px;
}

.wrap {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.content-section {
  width: 100%;
}

.content-article {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

/* ===== Aside (左侧) ===== */
.content-aside {
  flex: 0 0 220px;
  position: sticky;
  top: 24px;
  background: linear-gradient(160deg, var(--dark3), var(--mid));
  border: 1px solid #69ff6930;
  border-radius: var(--card-radius);
  padding: 28px 20px;
  box-shadow: 0 0 24px #69ff6910;
}

.aside-inner { display: flex; flex-direction: column; gap: 14px; }

.aside-title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--green);
  text-shadow: var(--glow-green);
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.aside-link {
  display: block;
  padding: 8px 12px;
  font-size: 0.88rem;
  color: var(--text-dim);
  border-radius: 10px;
  border-left: 2px solid transparent;
  min-height: 36px;
  transition: all var(--transition);
  line-height: 1.4;
}
.aside-link:hover {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: #00ffff0d;
  padding-left: 16px;
}

.aside-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-dim);
  padding: 8px 12px;
  border-radius: 10px;
  background: #69ff690d;
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: var(--glow-green);
  animation: dotBlink 2s step-end infinite;
  flex-shrink: 0;
}
@keyframes dotBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ===== Content Main ===== */
.content-main {
  flex: 1;
  min-width: 0;
}

/* page.content 内部样式 */
.content-main h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--white);
  margin: 48px 0 8px;
  padding-top: 12px;
  position: relative;
}
.content-main h2::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  margin-top: 10px;
  box-shadow: 0 0 10px #69ff6960;
}

.content-main h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--green);
  margin: 28px 0 8px;
  text-shadow: 0 0 8px #69ff6940;
}

.content-main p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 16px;
}

.content-main ul, .content-main ol {
  margin: 12px 0 20px 20px;
}
.content-main li {
  margin-bottom: 8px;
  line-height: 1.7;
  color: var(--text);
}
.content-main ul li::marker { color: var(--green); }

.content-main strong { color: var(--green); font-weight: 600; }
.content-main em { color: var(--cyan); font-style: italic; }

.content-main a {
  color: var(--cyan);
  border-bottom: 1px solid #00ffff40;
  transition: all var(--transition);
}
.content-main a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

.content-main article {
  padding: 20px 0;
  border-bottom: 1px solid #69ff6918;
}
.content-main article:last-child { border-bottom: none; }

/* 副标题 / subtitle class */
.subtitle, .subhead, .desc, .lead {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 20px;
  margin-top: -4px;
}

/* 卡片样式（若正文里有 .card） */
.content-main .card {
  background: linear-gradient(135deg, var(--dark3), var(--mid));
  border: 1px solid #69ff6928;
  border-radius: var(--card-radius);
  padding: 24px 28px;
  margin-bottom: 20px;
  border-bottom: 3px solid var(--green);
  box-shadow: 0 4px 20px #00000040;
  transition: transform var(--transition), box-shadow var(--transition);
}
.content-main .card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px #69ff6920;
}

/* table */
.content-main table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
}
.content-main th {
  background: var(--dark3);
  color: var(--green);
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid var(--green);
  font-weight: 600;
}
.content-main td {
  padding: 10px 14px;
  border-bottom: 1px solid #69ff6918;
  color: var(--text);
}
.content-main tr:hover td { background: #69ff690a; }

/* blockquote */
.content-main blockquote {
  border-left: 3px solid var(--cyan);
  background: #00ffff08;
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 20px 0;
  color: var(--text);
  font-style: italic;
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(160deg, #0a150a, #001212);
  border-top: 1px solid #69ff6930;
  padding: 60px 24px 32px;
}

.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid #69ff6920;
}

.footer-brand-super {
  font-family: var(--font-head);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  color: transparent;
  background: linear-gradient(135deg, var(--green) 0%, var(--cyan) 60%, var(--green) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 20px #69ff6960);
  letter-spacing: 0.02em;
}

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.7;
  max-width: 320px;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 8px;
}

.footer-address {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-contact-item {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-link-list li a {
  font-size: 0.9rem;
  color: var(--text-dim);
  padding: 6px 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.footer-link-list li a:hover { color: var(--green); }

.footer-bottom {
  max-width: 1200px;
  margin: 32px auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.footer-copy { color: var(--text-dim); }
.footer-bottom-right {
  color: #69ff6960;
  font-size: 0.8rem;
}

/* ===== Parallax / Scroll 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .hero-content { animation: fadeUp 0.7s ease both; }
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .content-main article {
    animation: sectionReveal linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 20%;
  }
  @keyframes sectionReveal {
    from { opacity: 0.3; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .content-aside { display: none; }
  .content-article { flex-direction: column; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 640px) {
  .hero-header {
    min-height: 45vh;
    padding: 40px 16px 0;
  }
  .hero-h1 { font-size: clamp(1.6rem, 8vw, 2.4rem); }
  .wrap { padding: 0 14px; }
  .bottom-nav { height: var(--nav-h); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-brand-super { font-size: clamp(2.4rem, 12vw, 4rem); }
  .nav-menu li a { font-size: 1rem; padding: 12px 16px; }
  article[id] { scroll-margin-top: calc(var(--nav-h) + 8px); }
}

@media (max-width: 375px) {
  body { font-size: 16px; }
  .hero-h1 { font-size: 1.7rem; }
}

/* ===== Chrome / Y2K 装饰细节 ===== */
.content-main article:first-child { padding-top: 0; }

::selection {
  background: var(--green);
  color: var(--dark2);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 霓虹 scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark2); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--green), var(--cyan));
  border-radius: 3px;
}

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