/* =========================================================================
   Costless Code 官方网站样式表 · 东方暖纸美学与工业杂志设计系统
   ========================================================================= */

:root {
  /* 暖纸基调色彩系统 */
  --paper-bg: #FAF8F5;
  --paper-sub: #F4EFE9;
  --paper-card: #FFFFFF;
  --paper-card-sub: #F9F6F1;
  --paper-border: #E5DED5;
  --paper-border-light: rgba(26, 26, 26, 0.06);

  /* 陶土砖红品牌强调色 */
  --brick: #D94A3A;
  --brick-dark: #B93A2C;
  --brick-light: #FDEEEB;
  --brick-glow: rgba(217, 74, 58, 0.16);
  --brick-glow-subtle: rgba(217, 74, 58, 0.08);

  /* 墨碳黑文字系统 */
  --ink-title: #141414;
  --ink-body: #3D3833;
  --ink-muted: #7E7770;
  --ink-faint: #A8A199;

  /* 辅助色彩 */
  --accent-blue: #2A6F97;
  --accent-green: #2A9D8F;
  --accent-amber: #E76F51;

  /* 字体系统 */
  --serif: 'Newsreader', Georgia, 'Songti SC', 'Noto Serif CJK SC', serif;
  --sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: 'DM Mono', 'JetBrains Mono', Consolas, monospace;

  /* 动画曲线与物理缓动 */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--paper-bg);
  color: var(--ink-body);
  font-family: var(--sans);
  line-height: 1.68;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* =========================================================================
   暖纸微光 Canvas 背景与网格底纹
   ========================================================================= */
#ambient-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -2;
  opacity: 0.65;
}

.ambient-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  background-image: 
    linear-gradient(to right, rgba(26, 26, 26, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(26, 26, 26, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* 容器与版心 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}

/* 顶部导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--paper-border-light);
  transition: all .24s ease;
}

.navbar.scrolled {
  background: rgba(250, 248, 245, 0.96);
  border-bottom-color: var(--paper-border);
  box-shadow: 0 4px 20px rgba(26, 26, 26, 0.04);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink-title);
}

.brand-badge {
  width: 32px;
  height: 32px;
  background: var(--brick);
  color: #FFFFFF;
  border-radius: 8px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--brick-glow);
  transition: transform .2s var(--ease-spring);
}

.nav-brand:hover .brand-badge {
  transform: scale(1.05) rotate(-2deg);
}

.brand-text {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 4px;
}

.brand-sub {
  color: var(--brick);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  transition: color .18s ease;
  position: relative;
  padding: 4px 0;
}

.nav-link:hover {
  color: var(--ink-title);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--brick);
  transition: width .2s var(--ease-spring);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-icon-link {
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1px solid var(--paper-border-light);
  background: transparent;
  transition: all .18s ease;
  text-decoration: none;
}

.nav-icon-link:hover {
  color: var(--ink-title);
  background: rgba(26, 26, 26, 0.04);
  border-color: var(--paper-border);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle span {
  width: 100%;
  height: 2.5px;
  background: var(--ink-title);
  border-radius: 2px;
  transition: all .2s ease;
}

/* 按钮基础系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .2s var(--ease-spring);
  white-space: nowrap;
}

.btn-primary {
  background: var(--brick);
  color: #FFFFFF;
  border-color: var(--brick);
  box-shadow: 0 4px 16px var(--brick-glow);
}

.btn-primary:hover {
  background: var(--brick-dark);
  border-color: var(--brick-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(217, 74, 58, 0.28);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: #FFFFFF;
  color: var(--ink-title);
  border-color: var(--paper-border);
  box-shadow: 0 2px 8px rgba(26, 26, 26, 0.03);
}

.btn-outline:hover {
  background: var(--paper-sub);
  border-color: var(--ink-muted);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(26, 26, 26, 0.06);
}

.btn-nav {
  padding: 8px 18px;
  font-size: 13.5px;
  background: var(--ink-title);
  color: #FFFFFF;
}

.btn-nav:hover {
  background: #2E2A27;
  transform: translateY(-1px);
}

.btn-hero {
  padding: 14px 28px;
  font-size: 15.5px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 58px;
}

.btn-hero .btn-sub {
  font-size: 11px;
  opacity: 0.85;
  font-family: var(--mono);
  font-weight: 400;
}

/* HERO 区块 */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-body);
  box-shadow: 0 2px 10px rgba(26, 26, 26, 0.04);
  margin-bottom: 28px;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brick);
  box-shadow: 0 0 6px var(--brick);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.badge-tag {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--brick);
  letter-spacing: 0.04em;
}

.badge-sep {
  color: var(--paper-border);
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(42px, 6.2vw, 76px);
  font-weight: 500;
  line-height: 1.14;
  color: var(--ink-title);
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.title-accent {
  color: var(--brick);
  font-style: italic;
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.title-outline {
  position: relative;
}

.title-outline::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 100%;
  height: 10px;
  background: rgba(217, 74, 58, 0.12);
  z-index: -1;
  border-radius: 4px;
}

.hero-desc {
  font-size: clamp(16px, 1.8vw, 20px);
  color: var(--ink-muted);
  max-width: 680px;
  line-height: 1.7;
  margin-bottom: 38px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-pill-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.pill-item {
  display: flex;
  align-items: center;
  gap: 7px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--paper-border-light);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--ink-body);
  backdrop-filter: blur(8px);
}

.pill-icon {
  font-size: 14px;
}

/* 产品界面拟真卡片 */
.hero-showcase {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  perspective: 1000px;
}

.showcase-window {
  background: #FAF8F5;
  border: 1.5px solid var(--paper-border);
  border-radius: 16px;
  box-shadow: 
    0 24px 64px rgba(26, 26, 26, 0.12),
    0 4px 16px rgba(26, 26, 26, 0.04);
  overflow: hidden;
  transition: transform .3s var(--ease-spring), box-shadow .3s var(--ease-spring);
  text-align: left;
}

.showcase-window:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 32px 80px rgba(217, 74, 58, 0.14),
    0 8px 24px rgba(26, 26, 26, 0.06);
}

.mock-titlebar {
  height: 40px;
  background: #EDE6DD;
  border-bottom: 1px solid var(--paper-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  user-select: none;
}

.mock-lights {
  display: flex;
  gap: 6px;
}

.mock-lights .light {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.mock-lights .red { background: #FF5F56; }
.mock-lights .yellow { background: #FFBD2E; }
.mock-lights .green { background: #27C93F; }

.mock-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-body);
}

.mock-logo {
  background: var(--brick);
  color: #FFFFFF;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 11px;
}

.mock-status {
  display: flex;
  gap: 8px;
  font-size: 11px;
  font-family: var(--mono);
}

.mock-quota {
  background: #FAF8F5;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--paper-border);
}

.mock-mode {
  background: var(--brick-light);
  color: var(--brick);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
}

/* 界面内部布局 */
.mock-body {
  display: grid;
  grid-template-columns: 200px 1fr 280px;
  min-height: 480px;
  background: #FAF8F5;
}

/* 侧边栏模拟 */
.mock-sidebar {
  background: #F4EFE9;
  border-right: 1px solid var(--paper-border);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mock-sb-btn {
  background: var(--brick);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mock-sb-btn kbd {
  background: rgba(0,0,0,0.18);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 10px;
  font-family: var(--mono);
}

.mock-sb-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mock-sb-title {
  font-size: 11px;
  color: var(--ink-muted);
  font-weight: 600;
  margin-bottom: 4px;
}

.mock-sb-file {
  padding: 5px 8px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--ink-body);
}

.mock-sb-file.active {
  background: #FAF8F5;
  font-weight: 600;
  border: 1px solid var(--paper-border);
}

.mock-sb-fm {
  margin-top: auto;
  border-top: 1px solid var(--paper-border);
  padding-top: 10px;
}

.mock-fm-title {
  font-size: 11px;
  color: var(--brick);
  font-weight: 600;
  margin-bottom: 6px;
}

.mock-tree-item {
  font-size: 11.5px;
  padding: 3px 6px;
  color: var(--ink-muted);
}

/* 中部对话区域模拟 */
.mock-chat {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px 20px;
  background: #FAF8F5;
}

.mock-msg {
  margin-bottom: 14px;
}

.user-bubble {
  background: #EDE6DD;
  color: var(--ink-title);
  padding: 10px 14px;
  border-radius: 12px 12px 2px 12px;
  font-size: 13.5px;
  max-width: 82%;
  margin-left: auto;
  border: 1px solid var(--paper-border);
}

.mock-ai-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.mock-ai-avatar {
  width: 20px;
  height: 20px;
  background: var(--brick);
  color: #FFFFFF;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

.mock-ai-name {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.mock-route-tag {
  background: var(--brick-light);
  color: var(--brick);
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: var(--mono);
}

.ai-bubble {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 12px;
  padding: 14px;
  font-size: 13px;
  box-shadow: 0 2px 8px rgba(26,26,26,0.03);
}

.mock-reasoning {
  color: var(--ink-muted);
  font-size: 12px;
  margin-bottom: 10px;
  font-style: italic;
}

.mock-code-block {
  background: #1A1A1A;
  color: #ECECEC;
  border-radius: 8px;
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  overflow-x: auto;
}

.mock-code-bar {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  padding-bottom: 6px;
  margin-bottom: 8px;
  font-size: 10.5px;
  color: #999;
}

.syn-kwd { color: #FF7B72; font-weight: 600; }
.syn-type { color: #79C0FF; }
.syn-str { color: #A5D6FF; }
.syn-com { color: #8B949E; font-style: italic; }

/* 拟真悬浮输入坞卡片 */
.mock-dock-card {
  background: #FFFFFF;
  border: 1.5px solid var(--brick);
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: 0 6px 20px var(--brick-glow);
  margin-top: 20px;
}

.mock-dock-input {
  font-size: 12.5px;
  color: var(--ink-muted);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(26,26,26,0.05);
  margin-bottom: 8px;
}

.mock-dock-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mock-bar-left, .mock-bar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mock-chip {
  font-size: 11px;
  background: var(--paper-sub);
  padding: 2px 7px;
  border-radius: 5px;
  border: 1px solid var(--paper-border-light);
  color: var(--ink-body);
}

.mock-chip.perm {
  color: var(--brick);
  font-weight: 600;
}

.mock-ring {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--brick);
  font-size: 7px;
  font-family: var(--mono);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mock-send-btn {
  width: 24px;
  height: 24px;
  background: var(--brick);
  color: #FFFFFF;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
}

/* 右侧 IDE 分屏模拟 */
.mock-ide {
  background: #F9F6F1;
  border-left: 1px solid var(--paper-border);
  display: flex;
  flex-direction: column;
}

.mock-ide-tabs {
  display: flex;
  border-bottom: 1px solid var(--paper-border);
  background: #EDE6DD;
  font-size: 11px;
}

.mock-tab {
  padding: 8px 10px;
  cursor: pointer;
}

.mock-tab.active {
  background: #F9F6F1;
  font-weight: 600;
  border-bottom: 2px solid var(--brick);
}

.mock-ide-editor {
  padding: 14px 10px;
  display: flex;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.8;
}

.mock-editor-lines {
  display: flex;
  flex-direction: column;
  color: #C0B7AC;
  text-align: right;
  user-select: none;
}

.mock-editor-code {
  color: var(--ink-body);
}

/* SECTION 通用样式 */
.section {
  padding: 100px 0;
  position: relative;
}

.section-head {
  margin-bottom: 56px;
}

.section-head.text-center {
  text-align: center;
}

.section-tag {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--brick);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(30px, 3.8vw, 48px);
  font-weight: 500;
  line-height: 1.22;
  color: var(--ink-title);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16.5px;
  color: var(--ink-muted);
  max-width: 640px;
  line-height: 1.68;
}

.section-head.text-center .section-subtitle {
  margin: 0 auto;
}

/* 指标度量卡片矩阵 */
.metrics-section {
  padding: 40px 0 80px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-card {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 14px;
  padding: 28px 24px;
  box-shadow: 0 4px 16px rgba(26, 26, 26, 0.03);
  transition: transform .24s var(--ease-spring), border-color .24s ease;
}

.metric-card:hover {
  transform: translateY(-4px);
  border-color: var(--brick);
}

.metric-num {
  font-family: var(--serif);
  font-size: 46px;
  font-weight: 600;
  color: var(--brick);
  line-height: 1;
  margin-bottom: 10px;
}

.metric-unit {
  font-size: 20px;
  margin-left: 2px;
  font-family: var(--sans);
  color: var(--ink-title);
}

.metric-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 6px;
}

.metric-desc {
  font-size: 13px;
  color: var(--ink-muted);
  line-height: 1.55;
}

/* 交互式智能路由器沙盘 */
.playground-card {
  background: #FFFFFF;
  border: 1.5px solid var(--paper-border);
  border-radius: 18px;
  box-shadow: 0 16px 40px rgba(26, 26, 26, 0.05);
  overflow: hidden;
}

.playground-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--paper-border);
  background: var(--paper-sub);
}

.pg-tab {
  background: transparent;
  border: none;
  padding: 20px 24px;
  text-align: left;
  cursor: pointer;
  transition: all .2s ease;
  border-right: 1px solid var(--paper-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pg-tab:last-child {
  border-right: none;
}

.pg-tab.active {
  background: #FFFFFF;
  border-top: 3px solid var(--brick);
}

.pg-tab-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-muted);
}

.pg-tab.active .pg-tab-tag {
  color: var(--brick);
  font-weight: 600;
}

.pg-tab-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-title);
}

.playground-stage {
  padding: 40px;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: center;
}

/* 仪表盘 */
.router-dial-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.dial-meter {
  width: 220px;
  height: 110px;
  background: conic-gradient(from 180deg at 50% 100%, #2A9D8F 0deg 60deg, #E76F51 60deg 120deg, #D94A3A 120deg 180deg);
  border-radius: 110px 110px 0 0;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-end;
}

.dial-meter::after {
  content: '';
  position: absolute;
  bottom: 0;
  width: 150px;
  height: 75px;
  background: #FFFFFF;
  border-radius: 75px 75px 0 0;
}

.dial-pointer {
  position: absolute;
  bottom: 0;
  left: calc(50% - 3px);
  width: 6px;
  height: 85px;
  background: var(--ink-title);
  border-radius: 3px;
  transform-origin: bottom center;
  transform: rotate(-60deg);
  transition: transform .6s var(--ease-spring);
  z-index: 2;
}

.dial-scale {
  position: absolute;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ink-muted);
}

.dial-scale.scale-1 { bottom: -24px; left: 0; }
.dial-scale.scale-2 { top: -24px; left: calc(50% - 22px); }
.dial-scale.scale-3 { bottom: -24px; right: 0; }

.dial-badge-label {
  margin-top: 36px;
  background: var(--brick-light);
  color: var(--brick);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  transition: all .2s ease;
}

/* 动态对比数据 */
.router-data-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.data-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--paper-border-light);
  font-size: 14.5px;
}

.data-key {
  color: var(--ink-muted);
}

.data-val {
  font-weight: 600;
  color: var(--ink-title);
}

.data-val.highlight {
  color: var(--brick);
  font-family: var(--mono);
}

.data-val.savings {
  color: #2A9D8F;
  font-weight: 700;
}

.data-progress-bar {
  width: 100%;
  height: 10px;
  background: var(--paper-sub);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 8px;
}

.data-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #2A9D8F, var(--brick));
  border-radius: 6px;
  transition: width .6s var(--ease-spring);
}

/* 全栈内置三大支柱卡片 */
.feature-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 16px;
  padding: 36px 30px;
  box-shadow: 0 4px 20px rgba(26, 26, 26, 0.03);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform .25s var(--ease-spring), border-color .25s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--brick);
  box-shadow: 0 12px 32px var(--brick-glow-subtle);
}

.f-card-icon {
  width: 48px;
  height: 48px;
  background: var(--paper-sub);
  border: 1px solid var(--paper-border);
  border-radius: 12px;
  font-family: var(--mono);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brick);
  margin-bottom: 20px;
}

.f-card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 12px;
  line-height: 1.35;
}

.f-card-desc {
  font-size: 14.5px;
  color: var(--ink-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.f-card-badge {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--brick);
  background: var(--brick-light);
  padding: 4px 10px;
  border-radius: 6px;
  align-self: flex-start;
}

/* 双根安全沙箱与快照卡片 */
.safety-box {
  background: #FFFFFF;
  border: 1.5px solid var(--paper-border);
  border-radius: 20px;
  padding: 56px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  box-shadow: 0 16px 48px rgba(26, 26, 26, 0.04);
}

.safety-list {
  list-style: none;
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.safety-list li {
  font-size: 14.5px;
  color: var(--ink-body);
  line-height: 1.65;
  position: relative;
  padding-left: 20px;
}

.safety-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--brick);
  font-weight: 800;
}

.checkpoint-card {
  background: #FAF8F5;
  border: 1px solid var(--paper-border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 6px 24px rgba(26, 26, 26, 0.06);
}

.cp-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--paper-border);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.cp-dot {
  width: 8px;
  height: 8px;
  background: #2A9D8F;
  border-radius: 50%;
}

.cp-tag {
  margin-left: auto;
  background: #E8F5E9;
  color: #2E7D32;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
}

.cp-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cp-file {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-family: var(--mono);
  background: #FFFFFF;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--paper-border-light);
}

.cp-diff.modified { color: #E76F51; margin-left: auto; font-weight: 600; }
.cp-diff.added { color: #2A9D8F; margin-left: auto; font-weight: 600; }

.btn-undo {
  width: 100%;
  margin-top: 10px;
  background: #1A1A1A;
  color: #FFFFFF;
  border-radius: 8px;
  font-size: 13px;
  padding: 10px;
  cursor: pointer;
  border: none;
  font-weight: 600;
}

.btn-undo:hover {
  background: var(--brick);
}

/* 多智能体网格 */
.agent-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.agent-card {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 14px;
  padding: 30px 26px;
  box-shadow: 0 4px 16px rgba(26, 26, 26, 0.03);
  transition: all .22s ease;
}

.agent-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(26, 26, 26, 0.06);
}

.agent-card.highlight-card {
  border: 1.5px solid var(--brick);
  background: #FFFDFB;
  box-shadow: 0 8px 28px var(--brick-glow);
}

.agent-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.agent-icon {
  font-size: 26px;
}

.agent-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-title);
}

.agent-role {
  font-size: 12px;
  color: var(--brick);
  font-family: var(--mono);
}

.agent-desc {
  font-size: 13.5px;
  color: var(--ink-muted);
  line-height: 1.6;
}

.agent-desc code {
  background: var(--paper-sub);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--mono);
  color: var(--brick);
  font-size: 12px;
}

/* 现代悬浮输入坞 DEMO 区块 */
.dock-demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.dock-feature-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.df-item {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  border-radius: 12px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  cursor: pointer;
  transition: all .2s ease;
}

.df-item:hover, .df-item.active {
  border-color: var(--brick);
  background: #FFFDFB;
  transform: translateX(4px);
  box-shadow: 0 4px 16px var(--brick-glow-subtle);
}

.df-num {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--brick);
}

.df-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 4px;
}

.df-desc {
  font-size: 13px;
  color: var(--ink-muted);
}

.dock-interactive-card {
  background: #FAF8F5;
  border: 1.5px solid var(--brick);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 30px var(--brick-glow);
}

.dock-card-header {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.dh-chip {
  font-size: 11px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  padding: 3px 8px;
  border-radius: 5px;
  color: var(--ink-muted);
}

.dock-card-input-area {
  min-height: 70px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  color: var(--ink-body);
  margin-bottom: 12px;
}

.dock-card-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dc-left, .dc-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dc-btn {
  width: 26px;
  height: 26px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--ink-muted);
}

.dc-badge {
  font-size: 11.5px;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  padding: 3px 8px;
  border-radius: 6px;
  color: var(--ink-body);
}

.dc-circle {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-family: var(--mono);
}

.dc-send-btn {
  width: 28px;
  height: 28px;
  background: var(--brick);
  color: #FFFFFF;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  box-shadow: 0 2px 6px var(--brick-glow);
}

/* 下载中心卡片区 */
.download-section {
  background: #F4EFE9;
  border-top: 1px solid var(--paper-border);
  border-bottom: 1px solid var(--paper-border);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.download-card {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 16px;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 0 4px 16px rgba(26, 26, 26, 0.03);
  transition: all .25s var(--ease-spring);
}

.download-card:hover:not(.disabled) {
  transform: translateY(-6px);
  box-shadow: 0 14px 36px rgba(26, 26, 26, 0.08);
}

.download-card.featured-download {
  border: 2px solid var(--brick);
  box-shadow: 0 12px 36px var(--brick-glow);
}

.dl-badge-recommend {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--brick);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.04em;
}

.dl-os-icon {
  font-size: 36px;
  margin-bottom: 14px;
}

.dl-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 4px;
}

.dl-version {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--brick);
  font-weight: 600;
  margin-bottom: 12px;
}

.dl-desc {
  font-size: 13px;
  color: var(--ink-muted);
  line-height: 1.6;
  margin-bottom: 24px;
  flex: 1 1 auto;
}

.btn-dl {
  width: 100%;
  padding: 12px;
  font-size: 14px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.dl-meta {
  font-size: 11.5px;
  color: var(--ink-faint);
  text-align: center;
}

.download-card.disabled {
  opacity: 0.65;
  background: rgba(255, 255, 255, 0.6);
}

.download-card.disabled button {
  cursor: not-allowed;
  opacity: 0.7;
}

.system-req-box {
  background: #FFFFFF;
  border: 1px solid var(--paper-border);
  border-radius: 12px;
  padding: 18px 24px;
  font-size: 13px;
  color: var(--ink-muted);
}

.req-title {
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 8px;
}

.req-items {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

/* 页脚 */
.footer {
  background: #FAF8F5;
  padding: 60px 0 40px;
  border-top: 1px solid var(--paper-border);
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.footer-slogan {
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  color: var(--brick);
  margin-bottom: 10px;
}

.footer-copy {
  font-size: 12.5px;
  color: var(--ink-muted);
  line-height: 1.65;
}

.footer-col-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink-title);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-col a {
  text-decoration: none;
  font-size: 13px;
  color: var(--ink-muted);
  transition: color .18s ease;
}

.footer-links-col a:hover {
  color: var(--brick);
}

/* 动效系统：轻量级平滑滚动进入 (Compact Spring & Hardware Accelerated) */
.reveal {
  opacity: 0;
  transform: translate3d(0, 16px, 0);
  -webkit-transform: translate3d(0, 16px, 0);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: opacity 0.52s cubic-bezier(0.16, 1, 0.3, 1), transform 0.52s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
  -webkit-transform: translate3d(0, 0, 0);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-trio {
    grid-template-columns: 1fr;
  }
  .safety-box {
    grid-template-columns: 1fr;
    padding: 36px;
  }
  .agent-grid {
    grid-template-columns: 1fr;
  }
  .dock-demo-grid {
    grid-template-columns: 1fr;
  }
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mock-body {
    grid-template-columns: 1fr;
  }
  .mock-sidebar, .mock-ide {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .navbar.menu-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: #FAF8F5;
    padding: 20px 28px;
    border-bottom: 1px solid var(--paper-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  }
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .playground-stage {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .playground-tabs {
    grid-template-columns: 1fr;
  }
  .footer-container {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}