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

/* ============================================================
   设计令牌
   ============================================================ */
:root {
  --c-mint:    #5cc6b0;
  --c-sand:    #d4c4a8;
  --c-dark:    #172623;
  --c-dark2:   #1e302c;
  --c-dark3:   #243b36;
  --c-dark4:   #0f1a18;
  --c-mint-dim:#3a9e8a;
  --c-sand-dim:#b0a08a;
  --c-text:    #c8d8d4;
  --c-text2:   #8fa89f;
  --c-accent:  #5cc6b0;
  --c-warn:    #c67b5c;

  --nav-w:     220px;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-hud:  'Orbitron', 'Arial Black', sans-serif;
  --font-body: 'JetBrains Mono', monospace;

  --radius:    0;
  --card-line: 3px;
  --trans:     0.25s ease-out;
}

/* ============================================================
   重置与基础
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-dark4);
  color: var(--c-text);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  background: var(--c-dark4);
  /* 有机土壤肌理底纹 */
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23noise)' opacity='0.06'/%3E%3C/svg%3E");
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: var(--c-mint); text-decoration: none; transition: color var(--trans); }
a:hover { color: var(--c-sand); }
ul, ol { list-style: none; }
h1,h2,h3,h4 { font-family: var(--font-hud); line-height: 1.2; }
p { margin-bottom: 1em; }

/* ============================================================
   滚动锚点边距（固定左导航补偿）
   ============================================================ */
section[id] { scroll-margin-top: 80px; }

@media (min-width: 900px) {
  section[id] { scroll-margin-top: 40px; }
}

/* ============================================================
   页面骨架
   ============================================================ */
.page-shell {
  display: flex;
  min-height: 100vh;
}

.page-body {
  flex: 1 1 0;
  margin-left: var(--nav-w);
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   左侧固定竖排导航
   ============================================================ */
.sidenav {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-w);
  height: 100vh;
  background: var(--c-dark2);
  border-right: 1px solid rgba(92,198,176,0.18);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
}

/* 品牌独占一行 */
.sidenav-brand {
  padding: 28px 20px 20px;
  border-bottom: 1px solid rgba(92,198,176,0.15);
  flex-shrink: 0;
}

.brand-link {
  display: block;
}

.site-logo-img {
  max-width: 140px;
  max-height: 48px;
  object-fit: contain;
}

.site-logo-text {
  font-family: var(--font-hud);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--c-mint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
}

/* 有序导航列表 */
.sidenav-list {
  flex: 1 1 0;
  padding: 16px 0;
  list-style: none;
  counter-reset: nav-counter;
}

.sidenav-list > li {
  counter-increment: nav-counter;
  position: relative;
}

.sidenav-list > li > a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-text2);
  letter-spacing: 0.04em;
  transition: background var(--trans), color var(--trans), padding-left var(--trans);
  min-height: 44px;
  border-left: 2px solid transparent;
  word-break: keep-all;
}

.sidenav-list > li > a::before {
  content: counter(nav-counter, decimal-leading-zero);
  font-family: var(--font-hud);
  font-size: 0.65rem;
  color: var(--c-mint-dim);
  flex-shrink: 0;
  opacity: 0.7;
}

.sidenav-list > li > a:hover {
  color: var(--c-mint);
  background: rgba(92,198,176,0.07);
  padding-left: 26px;
  border-left-color: var(--c-mint);
}

.sidenav-hud-line {
  height: 1px;
  background: linear-gradient(90deg, var(--c-mint) 0%, transparent 100%);
  margin: 0 20px 20px;
  opacity: 0.3;
  flex-shrink: 0;
}

/* ============================================================
   Hero 区
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-dark4) 0%, var(--c-dark2) 60%, var(--c-dark3) 100%);
  border-bottom: 1px solid rgba(92,198,176,0.15);
}

.hero-text {
  flex: 0 0 52%;
  padding: 80px 48px 80px 56px;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-hud);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-dark4);
  background: var(--c-mint);
  padding: 5px 14px;
  margin-bottom: 28px;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
}

.hero-h1 {
  font-family: var(--font-hud);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 900;
  color: var(--c-sand);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 20px;
  line-height: 1.1;
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--c-text2);
  max-width: 420px;
  margin-bottom: 36px;
  line-height: 1.75;
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-hud);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-dark4);
  background: var(--c-mint);
  padding: 14px 36px;
  border: none;
  position: relative;
  transition: background var(--trans), transform var(--trans);
  min-height: 44px;
}

.hero-cta::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--c-mint);
  transform: translate(4px, 4px);
  pointer-events: none;
  transition: transform var(--trans);
}

.hero-cta:hover {
  background: var(--c-mint-dim);
  color: #fff;
  transform: translate(-2px, -2px);
}
.hero-cta:hover::after {
  transform: translate(6px, 6px);
}

.hero-media {
  flex: 0 0 48%;
  position: relative;
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-hud-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(92,198,176,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(92,198,176,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: hud-pulse 6s ease-in-out infinite alternate;
}

@keyframes hud-pulse {
  from { opacity: 0.5; }
  to   { opacity: 1; }
}

.hero-orb {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(92,198,176,0.22) 0%, rgba(23,38,35,0) 70%);
  border: 1px solid rgba(92,198,176,0.25);
  position: relative;
  animation: orb-spin 20s linear infinite;
}

.hero-orb::before {
  content: '';
  position: absolute;
  inset: 20px;
  border-radius: 50%;
  border: 1px dashed rgba(212,196,168,0.2);
  animation: orb-spin 12s linear infinite reverse;
}

.hero-orb::after {
  content: 'DHT';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-hud);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--c-mint);
  letter-spacing: 0.3em;
  opacity: 0.5;
}

@keyframes orb-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.hud-label {
  position: absolute;
  font-family: var(--font-hud);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--c-mint);
  opacity: 0.55;
  text-transform: uppercase;
}
.hud-label-1 { top: 18%; left: 12%; }
.hud-label-2 { bottom: 28%; right: 10%; }
.hud-label-3 { bottom: 14%; left: 16%; }

/* ============================================================
   主体正文容器（main > div.wrap > section > article）
   ============================================================ */
.main-content {
  flex: 1 1 auto;
  padding: 0;
  background: var(--c-dark4);
}

.wrap {
  width: 100%;
}

.content-section {
  width: 100%;
  padding: 64px 48px;
}

.content-article {
  display: flex;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: flex-start;
}

/* ============================================================
   Aside（内容左侧）
   ============================================================ */
.content-aside {
  flex: 0 0 200px;
  position: sticky;
  top: 40px;
  align-self: flex-start;
}

.aside-inner {
  background: var(--c-dark2);
  border: 1px solid rgba(92,198,176,0.15);
  border-bottom: var(--card-line) solid var(--c-mint);
  padding: 24px 20px;
}

.aside-title {
  font-family: var(--font-hud);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mint);
  margin-bottom: 4px;
}

.aside-inner > .subtitle {
  font-size: 0.72rem;
  color: var(--c-text2);
  margin-bottom: 16px;
}

.aside-nav-list {
  list-style: none;
  counter-reset: aside-counter;
  margin-bottom: 20px;
}

.aside-nav-list li {
  counter-increment: aside-counter;
  margin-bottom: 2px;
}

.aside-nav-list li a {
  display: block;
  font-size: 0.72rem;
  color: var(--c-text2);
  padding: 5px 0;
  border-bottom: 1px solid rgba(92,198,176,0.08);
  transition: color var(--trans), padding-left var(--trans);
  line-height: 1.4;
}

.aside-nav-list li a:hover {
  color: var(--c-mint);
  padding-left: 6px;
}

.aside-stat {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(92,198,176,0.15);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-stat-val {
  font-family: var(--font-hud);
  font-size: 1.1rem;
  color: var(--c-mint);
  letter-spacing: 0.1em;
}

.aside-stat-label {
  font-size: 0.68rem;
  color: var(--c-text2);
  letter-spacing: 0.08em;
}

/* ============================================================
   正文主区
   ============================================================ */
.content-main {
  flex: 1 1 0;
  min-width: 0;
}

/* ============================================================
   page.content 里的各类元素样式
   ============================================================ */
.content-main h2,
.content-main h2.section-title {
  font-family: var(--font-hud);
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: var(--c-sand);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 48px 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(92,198,176,0.2);
  position: relative;
}

.content-main h2::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--c-mint);
  margin-right: 12px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* h2 + p.subtitle 契约 */
.content-main h2 + p,
.content-main h2 + .subtitle {
  font-size: 0.88rem;
  color: var(--c-text2);
  margin-bottom: 16px;
  font-style: italic;
}

.content-main h3 {
  font-family: var(--font-hud);
  font-size: 0.9rem;
  color: var(--c-mint);
  letter-spacing: 0.1em;
  margin: 32px 0 10px;
  text-transform: uppercase;
}

.content-main p {
  font-size: 0.95rem;
  color: var(--c-text);
  line-height: 1.85;
  margin-bottom: 1.1em;
}

.content-main ul,
.content-main ol {
  margin: 0 0 1.2em 0;
  padding-left: 0;
  list-style: none;
}

.content-main ul li,
.content-main ol li {
  padding: 6px 0 6px 24px;
  position: relative;
  font-size: 0.93rem;
  color: var(--c-text);
  border-bottom: 1px solid rgba(92,198,176,0.07);
  line-height: 1.7;
}

.content-main ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--c-mint);
  font-size: 0.8rem;
}

.content-main ol {
  counter-reset: ol-counter;
}
.content-main ol li {
  counter-increment: ol-counter;
}
.content-main ol li::before {
  content: counter(ol-counter, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-hud);
  font-size: 0.65rem;
  color: var(--c-mint-dim);
}

.content-main blockquote {
  border-left: 3px solid var(--c-mint);
  background: var(--c-dark2);
  margin: 20px 0;
  padding: 16px 20px;
  font-style: italic;
  color: var(--c-text2);
  font-size: 0.92rem;
}

.content-main a {
  color: var(--c-mint);
  text-decoration: underline;
  text-decoration-color: rgba(92,198,176,0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--trans), color var(--trans);
}

.content-main a:hover {
  color: var(--c-sand);
  text-decoration-color: var(--c-sand);
}

.content-main strong {
  color: var(--c-sand);
  font-weight: 500;
}

.content-main em {
  color: var(--c-mint);
  font-style: normal;
}

.content-main code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(92,198,176,0.1);
  color: var(--c-mint);
  padding: 2px 6px;
  border: 1px solid rgba(92,198,176,0.2);
}

.content-main pre {
  background: var(--c-dark2);
  border: 1px solid rgba(92,198,176,0.15);
  border-left: 3px solid var(--c-mint);
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* section 分隔 */
.content-main section {
  padding-top: 56px;
  margin-top: 0;
  border-top: 1px solid rgba(92,198,176,0.1);
}

.content-main section:first-child {
  border-top: none;
  padding-top: 0;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--c-dark2);
  border-top: 1px solid rgba(92,198,176,0.18);
}

/* 大 CTA 块 */
.footer-cta-block {
  background: linear-gradient(135deg, var(--c-dark3) 0%, var(--c-dark2) 100%);
  border-bottom: 1px solid rgba(92,198,176,0.15);
  padding: 64px 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.footer-cta-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(92,198,176,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(92,198,176,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.footer-cta-title {
  font-family: var(--font-hud);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  color: var(--c-sand);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.footer-cta-sub {
  font-size: 0.9rem;
  color: var(--c-text2);
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

.footer-cta-btn {
  display: inline-block;
  font-family: var(--font-hud);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-dark4);
  background: var(--c-mint);
  padding: 14px 40px;
  position: relative;
  z-index: 1;
  transition: background var(--trans), transform var(--trans);
  min-height: 44px;
}

.footer-cta-btn:hover {
  background: var(--c-sand);
  color: var(--c-dark4);
  transform: translateY(-2px);
}

/* 三栏 */
.footer-cols {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid rgba(92,198,176,0.12);
}

.footer-col {
  padding: 48px 40px;
  border-right: 1px solid rgba(92,198,176,0.1);
}

.footer-col:last-child {
  border-right: none;
}

.footer-logo {
  margin-bottom: 16px;
}

.footer-brand-desc {
  font-size: 0.82rem;
  color: var(--c-text2);
  line-height: 1.7;
}

.footer-col-title {
  font-family: var(--font-hud);
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-mint);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(92,198,176,0.2);
}

.footer-nav ol {
  list-style: none;
}

.footer-nav ol li {
  margin-bottom: 4px;
}

.footer-nav ol li a {
  font-size: 0.82rem;
  color: var(--c-text2);
  padding: 5px 0;
  display: inline-block;
  min-height: 40px;
  line-height: 2.8;
  transition: color var(--trans), padding-left var(--trans);
}

.footer-nav ol li a:hover {
  color: var(--c-mint);
  padding-left: 8px;
}

.footer-info-text {
  font-size: 0.82rem;
  color: var(--c-text2);
  line-height: 1.75;
  margin-bottom: 12px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-contact-item {
  font-size: 0.8rem;
  color: var(--c-text2);
  font-family: var(--font-mono);
}

/* 底栏 */
.footer-bottom {
  padding: 20px 40px;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--c-text2);
  font-family: var(--font-mono);
}

.footer-hud-tag {
  font-family: var(--font-hud);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: rgba(92,198,176,0.35);
  text-transform: uppercase;
}

/* ============================================================
   p.subtitle 契约（标题装饰）
   ============================================================ */
.subtitle {
  font-size: 0.88rem;
  color: var(--c-text2);
  font-style: italic;
  margin-bottom: 1em;
}

h2 + .subtitle,
h2 + p.subtitle {
  margin-top: -4px;
}

/* ============================================================
   动效（Hover Micro + Stagger）
   ============================================================ */
.sidenav-list > li {
  opacity: 0;
  transform: translateX(-12px);
  animation: stagger-in 0.4s ease-out forwards;
}

.sidenav-list > li:nth-child(1) { animation-delay: 0.05s; }
.sidenav-list > li:nth-child(2) { animation-delay: 0.10s; }
.sidenav-list > li:nth-child(3) { animation-delay: 0.15s; }
.sidenav-list > li:nth-child(4) { animation-delay: 0.20s; }
.sidenav-list > li:nth-child(5) { animation-delay: 0.25s; }
.sidenav-list > li:nth-child(6) { animation-delay: 0.30s; }
.sidenav-list > li:nth-child(7) { animation-delay: 0.35s; }
.sidenav-list > li:nth-child(8) { animation-delay: 0.40s; }

@keyframes stagger-in {
  to { opacity: 1; transform: translateX(0); }
}

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

/* ============================================================
   汉堡按钮（移动端）
   ============================================================ */
.nav-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  background: var(--c-dark2);
  border: 1px solid rgba(92,198,176,0.3);
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-mint);
  transition: transform var(--trans), opacity var(--trans);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 899px) {
  :root { --nav-w: 0px; }

  .page-body { margin-left: 0; }

  .sidenav {
    transform: translateX(-100%);
    transition: transform var(--trans);
    width: 260px;
    box-shadow: 4px 0 24px rgba(0,0,0,0.5);
  }

  .sidenav.open {
    transform: translateX(0);
  }

  .nav-toggle { display: flex; }

  .hero {
    flex-direction: column;
    min-height: 100vh;
    padding-top: 70px;
  }

  .hero-text {
    flex: none;
    padding: 40px 24px 32px;
  }

  .hero-media {
    flex: 0 0 260px;
    width: 100%;
    min-height: 260px;
  }

  .hero-orb {
    width: 180px;
    height: 180px;
  }

  .content-section {
    padding: 40px 20px;
  }

  .content-article {
    flex-direction: column;
    gap: 28px;
  }

  .content-aside {
    flex: none;
    width: 100%;
    position: static;
  }

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

  .footer-col {
    border-right: none;
    border-bottom: 1px solid rgba(92,198,176,0.1);
    padding: 32px 24px;
  }

  .footer-col:last-child { border-bottom: none; }

  .footer-cta-block {
    padding: 48px 24px;
  }

  .footer-bottom {
    padding: 16px 24px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-h1 { font-size: 1.5rem; }
  .hero-badge { font-size: 0.6rem; }
  .hero-text { padding: 36px 16px 28px; }
  .content-section { padding: 32px 14px; }
  .footer-cta-block { padding: 36px 16px; }
  .footer-col { padding: 28px 16px; }
}