/* 中环生态 — 科技风官网 */
:root {
  --bg-deep: #030812;
  --bg-panel: #071428;
  --bg-elevated: #0c1f3a;
  --line: rgba(0, 200, 255, 0.12);
  --line-strong: rgba(0, 200, 255, 0.28);
  --text: #e8eef6;
  --text-muted: #8fa3bc;
  --accent: #00c8ff;
  --accent-dim: rgba(0, 200, 255, 0.15);
  --gold: #c9a962;
  --gold-dim: rgba(201, 169, 98, 0.2);
  --max: 1280px;
  --nav-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent-dim);
  color: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* 背景网格 */
.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 70%);
  opacity: 0.5;
}

.bg-glow {
  position: fixed;
  width: 60vw;
  height: 60vw;
  max-width: 800px;
  max-height: 800px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

.bg-glow--tl {
  top: -20%;
  left: -10%;
  background: var(--accent);
}

.bg-glow--br {
  bottom: -30%;
  right: -15%;
  background: var(--gold);
}

/* 导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), backdrop-filter 0.4s;
}

.site-header.is-scrolled {
  background: rgba(3, 8, 18, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(100% - 48px, var(--max));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.brand-name {
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.12em;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding: 8px 14px;
  letter-spacing: 0.04em;
  transition: color 0.25s;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 14px;
  right: 14px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.3s var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--text);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--text);
  width: 44px;
  height: 44px;
  cursor: pointer;
  font-size: 1.25rem;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 24px 80px;
  z-index: 1;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(3, 8, 18, 0.92) 0%,
    rgba(3, 8, 18, 0.75) 45%,
    rgba(5, 20, 40, 0.85) 100%
  );
}

.hero-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: "Barlow Condensed", sans-serif;
  font-size: 0.875rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-eyebrow::before {
  content: "";
  width: 48px;
  height: 1px;
  background: var(--accent);
}

.hero-title {
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  line-height: 1.15;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.75rem);
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 0.2em;
  margin-bottom: 40px;
}

.hero-tagline {
  font-size: 1.0625rem;
  color: var(--text);
  max-width: 640px;
  padding-left: 20px;
  border-left: 2px solid var(--gold);
  margin-bottom: 48px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-meta strong {
  display: block;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 4px;
  letter-spacing: 0.06em;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  animation: float 3s ease-in-out infinite;
}

.hero-scroll span {
  width: 1px;
  height: 40px;
  background: linear-gradient(var(--accent), transparent);
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* 通用区块 */
.section {
  position: relative;
  z-index: 1;
  padding: 120px 24px;
}

.section-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
}

.section-head {
  margin-bottom: 64px;
  max-width: 720px;
}

.section-label {
  font-family: "Barlow Condensed", sans-serif;
  font-size: 0.8125rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.04em;
}

.section-desc {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 1rem;
}

/* 目录卡片 */
.toc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.toc-card {
  background: var(--bg-panel);
  padding: 36px 32px;
  transition: background 0.35s var(--ease);
}

.toc-card:hover {
  background: var(--bg-elevated);
}

.toc-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--gold);
  margin-bottom: 16px;
}

.toc-card h3 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.toc-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 合规三柱 */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pillar-card {
  position: relative;
  padding: 40px 32px;
  background: linear-gradient(160deg, var(--bg-elevated) 0%, var(--bg-panel) 100%);
  border: 1px solid var(--line);
  overflow: hidden;
}

.pillar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.pillar-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 24px;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  font-family: "Noto Serif SC", serif;
  font-size: 1.25rem;
  color: var(--accent);
}

.pillar-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.pillar-card .pillar-sub {
  font-size: 0.8125rem;
  color: var(--gold);
  margin-bottom: 20px;
}

.pillar-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* 机制流程 */
.mechanism-block {
  margin-bottom: 80px;
}

.mechanism-block:last-child {
  margin-bottom: 0;
}

.mechanism-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.mechanism-stat {
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}

.mechanism-stat small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: 0.1em;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.flow-step {
  padding: 28px 24px;
  border: 1px solid var(--line);
  background: rgba(7, 20, 40, 0.6);
  position: relative;
}

.flow-step::after {
  content: "→";
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--line-strong);
  font-size: 0.875rem;
  z-index: 2;
}

.flow-step:last-child::after {
  display: none;
}

.flow-step h4 {
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 10px;
  color: var(--text);
}

.flow-step p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.insight-panel {
  margin-top: 32px;
  padding: 32px 36px;
  border-left: 3px solid var(--gold);
  background: var(--gold-dim);
}

.insight-panel p {
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.8;
}

.insight-panel p + p {
  margin-top: 16px;
}

/* 定发增发时间线 */
.cycle-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line);
  margin-top: 48px;
}

.cycle-node {
  background: var(--bg-panel);
  padding: 28px 20px;
  text-align: center;
}

.cycle-node .num {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.cycle-node h4 {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.cycle-node p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.cycle-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.cycle-feature {
  padding: 28px;
  border: 1px solid var(--line);
}

.cycle-feature h4 {
  font-size: 1rem;
  color: var(--gold);
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.cycle-feature p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* 8倍流通 */
.rule-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.rule-phase {
  padding: 40px;
  border: 1px solid var(--line);
}

.rule-phase--free {
  border-color: rgba(0, 200, 255, 0.35);
}

.rule-phase--force {
  border-color: rgba(201, 169, 98, 0.35);
}

.rule-phase h3 {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.rule-phase p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.goals-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.goal-item {
  padding: 20px 24px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  font-size: 0.875rem;
}

.goal-item strong {
  display: block;
  color: var(--accent);
  margin-bottom: 6px;
  font-weight: 500;
}

/* 商业闭环 */
.loop-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.loop-item {
  position: relative;
  padding: 28px 22px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  min-height: 160px;
}

.loop-item .loop-index {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.6875rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.loop-item h4 {
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 10px;
  line-height: 1.4;
}

.loop-item p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 对比表 */
.compare-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.compare-table th,
.compare-table td {
  padding: 20px 24px;
  text-align: left;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--line);
}

.compare-table thead th {
  background: var(--bg-elevated);
  font-weight: 500;
  letter-spacing: 0.06em;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.compare-table th:first-child {
  width: 18%;
  color: var(--text-muted);
}

.compare-table .col-highlight {
  background: rgba(0, 200, 255, 0.06);
  color: var(--text);
  border-left: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
}

.compare-table tbody tr:last-child td {
  border-bottom: none;
}

.compare-table .col-highlight strong {
  color: var(--accent);
}

/* 国家战略 */
.strategy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.strategy-card {
  padding: 48px 36px;
  background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-panel) 100%);
  border: 1px solid var(--line);
}

.strategy-card h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.5rem;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.strategy-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.strategy-card p:last-child {
  margin-bottom: 0;
}

.strategy-highlight {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.125rem;
  color: var(--accent);
  margin: 20px 0;
}

/* 多方共赢 */
.stakeholder-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.stakeholder-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.stakeholder-label {
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px;
  border-right: 1px solid var(--line);
}

.stakeholder-label span {
  font-family: "Noto Serif SC", serif;
  font-size: 1.5rem;
  writing-mode: vertical-rl;
  letter-spacing: 0.2em;
}

.stakeholder-body {
  padding: 32px 28px;
}

.stakeholder-body h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--gold);
  margin-bottom: 16px;
}

.stakeholder-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* 合规声明 */
.disclaimer-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.disclaimer-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 28px;
  padding: 32px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
}

.disclaimer-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.25rem;
  color: var(--accent);
}

.disclaimer-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 12px;
  font-weight: 500;
}

.disclaimer-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* Footer CTA */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 100px 24px 48px;
  text-align: center;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(5, 20, 40, 0.8));
}

.footer-title {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.footer-sub {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-motto {
  font-size: 1rem;
  color: var(--gold);
  margin-bottom: 48px;
  letter-spacing: 0.12em;
}

.footer-beian {
  margin-top: 20px;
  font-size: 0.75rem;
}

.footer-beian a {
  color: var(--text-muted);
  letter-spacing: 0.06em;
  transition: color 0.25s;
}

.footer-beian a:hover {
  color: var(--accent);
}

/* 动画 */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式 */
@media (max-width: 1024px) {
  .toc-grid,
  .pillar-grid,
  .strategy-grid {
    grid-template-columns: 1fr;
  }

  .cycle-timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .loop-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(3, 8, 18, 0.98);
    padding: 24px;
    border-bottom: 1px solid var(--line);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .cycle-timeline,
  .cycle-features,
  .goals-list,
  .stakeholder-grid {
    grid-template-columns: 1fr;
  }

  .stakeholder-card {
    grid-template-columns: 1fr;
  }

  .stakeholder-label span {
    writing-mode: horizontal-tb;
  }

  .flow-step::after {
    display: none;
  }

  .section {
    padding: 80px 20px;
  }
}