/* ==========================================================================
   Seeit 官网样式表 (Official Website Stylesheet)
   设计风格：深度参考 Seeit 应用图标 (深灰黑圆角 #111113 + 冷金属浅灰 #d7d7d9 + 品牌霓虹橙 #ff5a36)
   纯 CSS3 实现，零外部运行时依赖，支持桌面与移动端完美自适应
   ========================================================================== */

:root {
  /* 基础色彩系统 (基准取自 Icon 与桌面面板令牌) */
  --bg-deep: #08080a;
  --bg-base: #0c0c0e;
  --bg-surface: #111113;        /* Seeit Icon 核心底色 */
  --bg-card: #151518;
  --bg-card-hover: #1a1a1e;
  --bg-input: #121215;
  --bg-glass: rgba(17, 17, 19, 0.75);

  /* 边框与微光 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-strong: rgba(255, 255, 255, 0.24);
  --border-glow: rgba(255, 90, 54, 0.35);

  /* 字体色彩 */
  --text-pure: #ffffff;
  --text-main: #ededf0;
  --text-icon: #d7d7d9;        /* Seeit Icon 核心浅灰 */
  --text-muted: #8e8e96;
  --text-faint: #5a5a62;

  /* 强调色体系 */
  --primary: #ff5a36;          /* Seeit 标志性霓虹橙 */
  --primary-hover: #ff704f;
  --primary-dark: #c2410c;
  --primary-glow: rgba(255, 90, 54, 0.22);
  --primary-glow-strong: rgba(255, 90, 54, 0.45);

  --accent-green: #b4c96f;     /* 酸绿/成功色 */
  --accent-green-glow: rgba(180, 201, 111, 0.25);
  --accent-blue: #60a5fa;      /* 科技蓝点缀 */
  --accent-purple: #c084fc;    /* 多模态紫 */

  /* 阴影与微光 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 20px 48px -8px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 40px -10px var(--primary-glow-strong);
  --shadow-icon: 0 16px 36px -10px rgba(0, 0, 0, 0.8), 0 0 20px -2px rgba(255, 255, 255, 0.05);

  /* 尺寸与字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: radial-gradient(circle at 50% 0%, #17171d 0%, var(--bg-deep) 65%);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

::selection {
  background: var(--primary);
  color: #000;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* 容器与网格底纹 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.bg-grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 900px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(circle at 50% 20%, black 15%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 20%, black 15%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: all 0.25s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.5px;
}

.nav-brand-icon {
  width: 34px;
  height: 34px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-brand:hover .nav-brand-icon {
  transform: scale(1.06);
  border-color: var(--primary);
  box-shadow: 0 0 14px var(--primary-glow);
}

.nav-brand-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--text-icon);
}

.nav-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 2px 7px;
  border-radius: 20px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--text-pure);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn-nav-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-icon);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.btn-nav-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-pure);
  border-color: var(--border-medium);
}

.btn-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  background: var(--primary);
  color: #000;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 10px var(--primary-glow);
}

.btn-nav-cta:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--primary-glow-strong);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-icon);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 移动端抽屉默认全局隐藏，彻底防止在 PC 桌面端错位渲染 */
.mobile-nav-drawer {
  display: none !important;
}

/* ==========================================================================
   Hero 首屏 (Hero Section)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 60px;
  text-align: center;
  z-index: 1;
}

.hero-pill-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-medium);
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 13px;
  color: var(--text-icon);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.hero-pill-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-pill-wrapper span.tag {
  color: var(--primary);
  font-weight: 600;
}

/* 核心应用图标渲染（参考真实 Icon 质感） */
.hero-icon-display {
  position: relative;
  width: 110px;
  height: 110px;
  margin: 0 auto 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-icon-glow {
  position: absolute;
  inset: -12px;
  background: radial-gradient(circle, var(--primary-glow-strong) 0%, transparent 70%);
  border-radius: 40px;
  filter: blur(14px);
  opacity: 0.8;
  z-index: 0;
  animation: breathe-glow 4s infinite alternate ease-in-out;
}

@keyframes breathe-glow {
  0% { transform: scale(0.96); opacity: 0.6; }
  100% { transform: scale(1.08); opacity: 0.95; }
}

.hero-icon-frame {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #1c1c20 0%, #0d0d0f 100%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-icon);
  z-index: 1;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.hero-icon-frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 45%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.12) 0%, transparent 100%);
  border-radius: 26px 26px 0 0;
  pointer-events: none;
}

.hero-icon-frame:hover {
  transform: translateY(-4px) scale(1.03);
  border-color: rgba(255, 255, 255, 0.3);
}

.hero-icon-frame svg {
  width: 58px;
  height: 58px;
  fill: var(--text-icon);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.6));
}

.hero-title {
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 22px;
  color: var(--text-pure);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .accent-text {
  background: linear-gradient(135deg, #ff7a59 0%, #ff5a36 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 38px;
  line-height: 1.6;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn-primary-large {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(180deg, #ff6b48 0%, #ff5a36 100%);
  color: #000;
  font-size: 16px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 20px var(--primary-glow);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary-large:hover {
  background: linear-gradient(180deg, #ff7b5c 0%, #ff6442 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--primary-glow-strong);
}

.btn-secondary-large {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-pure);
  font-size: 16px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: all 0.2s ease;
}

.btn-secondary-large:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

/* 终端一键安装栏 */
.hero-install-box {
  display: inline-flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 8px 12px 8px 16px;
  gap: 14px;
  max-width: 90%;
  box-shadow: var(--shadow-md);
}

.hero-install-prompt {
  color: var(--primary);
  font-family: var(--font-mono);
  font-weight: 700;
}

.hero-install-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-icon);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-copy-code {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-copy-code:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-pure);
  border-color: var(--border-medium);
}

.btn-copy-code.copied {
  background: var(--accent-green);
  color: #000;
  border-color: var(--accent-green);
}

/* ==========================================================================
   交互式产品视效演示台 (Interactive Demo Showcase)
   ========================================================================== */
.demo-showcase-section {
  position: relative;
  margin-top: 50px;
  margin-bottom: 100px;
  z-index: 2;
}

.demo-window {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 60px -20px rgba(0, 0, 0, 0.9);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.demo-window-header {
  height: 46px;
  background: #141417;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
}

.window-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.window-title {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.window-controls-dummy {
  width: 50px;
}

.demo-window-body {
  display: grid;
  grid-template-columns: 340px 1fr;
  min-height: 480px;
  background: #0e0e11;
}

/* 侧边：Agent 对话与指令区 */
.demo-agent-panel {
  border-right: 1px solid var(--border-subtle);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: #111114;
}

.agent-message-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 13px;
}

.agent-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary);
}

.agent-header svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.agent-bubble-text {
  color: var(--text-icon);
  line-height: 1.5;
}

.mcp-tool-call {
  background: #0a0a0c;
  border: 1px solid rgba(255, 90, 54, 0.25);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.mcp-tool-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--primary);
  margin-bottom: 6px;
  font-weight: 600;
}

.mcp-tool-json {
  color: #a1a1aa;
  overflow-x: auto;
}

.demo-status-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--accent-green);
  font-family: var(--font-mono);
  background: rgba(180, 201, 111, 0.08);
  border: 1px solid rgba(180, 201, 111, 0.2);
  padding: 6px 12px;
  border-radius: 99px;
  width: fit-content;
}

/* 主内容：视频镜头与多模态匹配结果 */
.demo-result-panel {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-pure);
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-metric {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 10px;
  border-radius: 6px;
}

.shot-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.shot-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}

.shot-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.shot-card.highlight {
  border-color: var(--border-glow);
  box-shadow: 0 0 20px -5px var(--primary-glow);
}

.shot-thumbnail {
  position: relative;
  width: 100%;
  height: 150px;
  background: #19191e;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.shot-thumbnail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
}

.shot-thumbnail-overlay {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 4px;
}

.shot-score-tag {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255, 90, 54, 0.9);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: #000;
}

.shot-content {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.shot-transcription {
  font-size: 13px;
  color: var(--text-pure);
  font-weight: 500;
  line-height: 1.4;
}

.shot-transcription span.match {
  color: var(--primary);
  background: rgba(255, 90, 54, 0.12);
  padding: 1px 4px;
  border-radius: 3px;
}

.shot-vlm-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  background: rgba(255, 255, 255, 0.02);
  padding: 8px;
  border-radius: 6px;
  border-left: 2px solid var(--accent-purple);
}

.shot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.shot-tag-item {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

/* ==========================================================================
   核心设计哲学卡片 (4大支柱)
   ========================================================================== */
.pillars-section {
  padding: 60px 0 100px;
}

.section-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
  text-align: center;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -1px;
  text-align: center;
  color: var(--text-pure);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 50px;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.pillar-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.pillar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: background 0.3s ease;
}

.pillar-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.pillar-card:hover::before {
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: #18181d;
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-icon);
}

.pillar-icon svg {
  width: 24px;
  height: 24px;
}

.pillar-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-pure);
}

.pillar-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   架构工作流管线 (Architecture Pipeline)
   ========================================================================== */
.pipeline-section {
  padding: 60px 0 100px;
  background: radial-gradient(circle at 50% 50%, rgba(255, 90, 54, 0.04) 0%, transparent 70%);
}

.pipeline-flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 40px;
  position: relative;
}

.pipeline-node {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  position: relative;
  transition: all 0.25s ease;
}

.pipeline-node:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--primary-glow);
}

.node-step-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.06);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid var(--border-subtle);
}

.node-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-pure);
}

.node-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   6大核心功能 Bento Grid 网格
   ========================================================================== */
.features-section {
  padding: 60px 0 100px;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
}

.bento-item:hover {
  border-color: var(--border-strong);
  background: #141417;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.bento-item.span-2 {
  grid-column: span 2;
}

.bento-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bento-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

.bento-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-pure);
}

.bento-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.bento-preview-box {
  margin-top: auto;
  background: #09090b;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-icon);
}

/* ==========================================================================
   Agent 客户端接入配置中心
   ========================================================================== */
.integration-section {
  padding: 60px 0 100px;
}

.integration-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.client-tabs-nav {
  display: flex;
  background: #131316;
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.client-tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 16px 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.client-tab-btn:hover {
  color: var(--text-pure);
  background: rgba(255, 255, 255, 0.02);
}

.client-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: rgba(255, 90, 54, 0.04);
}

.client-tab-content {
  padding: 32px;
  display: none;
}

.client-tab-content.active {
  display: block;
}

.config-code-block {
  position: relative;
  background: #0a0a0c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #e4e4e7;
  overflow-x: auto;
  line-height: 1.5;
}

.config-code-block .btn-copy-code {
  position: absolute;
  top: 14px;
  right: 14px;
}

/* ==========================================================================
   终端模拟测试区 (Terminal Simulator)
   ========================================================================== */
.terminal-section {
  padding: 60px 0 100px;
}

.terminal-window {
  background: #09090b;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.terminal-header {
  background: #141418;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-tabs {
  display: flex;
  gap: 8px;
}

.terminal-tab-btn {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.terminal-tab-btn:hover {
  color: var(--text-pure);
}

.terminal-tab-btn.active {
  background: rgba(255, 255, 255, 0.08);
  color: var(--primary);
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #d1d5db;
  min-height: 280px;
}

.term-cmd { color: var(--primary); font-weight: 600; }
.term-success { color: var(--accent-green); }
.term-muted { color: var(--text-faint); }
.term-highlight { color: #60a5fa; }

/* ==========================================================================
   下载与平台分发 (Download Matrix)
   ========================================================================== */
.download-section {
  padding: 60px 0 100px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 32px;
  max-width: 920px;
  margin: 0 auto;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.download-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.download-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.download-os-icon {
  width: 48px;
  height: 48px;
  background: #19191e;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-icon);
}

.download-card-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-pure);
}

.download-card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.download-btn-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;
}

.btn-download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-pure);
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-download-item:hover {
  background: rgba(255, 90, 54, 0.12);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.btn-download-item:hover .btn-download-title {
  color: var(--primary);
}

.btn-download-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  text-align: left;
}

.btn-download-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-pure);
  transition: color 0.2s;
}

.btn-download-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   首次安装指引与安全放行卡片
   -------------------------------------------------------------------------- */
.install-tips-box {
  max-width: 960px;
  margin: 36px auto 0;
  background: rgba(22, 22, 26, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  position: relative;
  overflow: hidden;
}

.install-tips-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 90, 54, 0.6), transparent);
}

.install-tips-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.install-tips-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.install-tips-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 90, 54, 0.12);
  border: 1px solid rgba(255, 90, 54, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.install-tips-icon svg {
  width: 20px;
  height: 20px;
}

.install-tips-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 4px;
}

.install-tips-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.install-tips-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  color: #34d399;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.25);
  padding: 4px 10px;
  border-radius: 99px;
  letter-spacing: 0.5px;
}

.install-tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .install-tips-grid {
    grid-template-columns: 1fr;
  }
}

.install-tip-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.install-tip-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.platform-pill {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

.platform-pill.mac {
  background: rgba(255, 255, 255, 0.1);
  color: #f4f4f5;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.platform-pill.win {
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.tip-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-pure);
}

.tip-card-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

.tip-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 4px 0;
}

.tip-step-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 12.5px;
  color: #d4d4d8;
  line-height: 1.5;
}

.tip-step-item strong {
  color: #fff;
}

.step-num {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(255, 90, 54, 0.18);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.tip-geek-hint {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 11.5px;
  color: var(--text-faint);
  line-height: 1.5;
}

.tip-geek-hint code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.4);
  color: var(--primary);
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid rgba(255, 90, 54, 0.2);
}

.release-pill-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 36px;
}

.release-info-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 7px 18px;
  border-radius: 99px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-icon);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */
.faq-section {
  padding: 60px 0 100px;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-pure);
  text-align: left;
  cursor: pointer;
}

.faq-icon-arrow {
  transition: transform 0.25s ease;
  color: var(--text-muted);
}

.faq-item.open .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: #08080a;
  padding: 60px 0 30px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.footer-brand-col {
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-links-col {
  display: flex;
  gap: 60px;
}

.footer-links-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-group-title {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-pure);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-link {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 992px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-item.span-2 {
    grid-column: span 1;
  }
  .demo-window-body {
    grid-template-columns: 1fr;
  }
  .demo-agent-panel {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

/* ==========================================================================
   前沿探索实验室板块 (Seeit Labs · Experimental)
   ========================================================================== */
.labs-section {
  padding: 80px 0 100px;
  position: relative;
}

.labs-card {
  position: relative;
  background: linear-gradient(135deg, rgba(21, 21, 26, 0.95) 0%, rgba(13, 13, 16, 0.98) 100%);
  border: 1px solid rgba(192, 132, 252, 0.3);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.7), 0 0 40px -15px rgba(192, 132, 252, 0.2);
  overflow: hidden;
}

.labs-card::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(192, 132, 252, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.labs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.labs-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: #c084fc;
  background: rgba(192, 132, 252, 0.1);
  border: 1px solid rgba(192, 132, 252, 0.3);
  border-radius: 99px;
}

.labs-privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--accent-green);
  background: rgba(180, 201, 111, 0.08);
  border: 1px solid rgba(180, 201, 111, 0.2);
  padding: 4px 12px;
  border-radius: 99px;
}

.labs-title {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.labs-intro {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 820px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.labs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.labs-grid-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.2s ease;
}

.labs-grid-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(192, 132, 252, 0.4);
  transform: translateY(-2px);
}

.labs-grid-item-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-pure);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.labs-grid-item-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.labs-footer-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px dashed rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-icon);
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-nav-outline {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .mobile-nav-drawer {
    display: none !important;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-medium);
    padding: 20px;
    flex-direction: column;
    gap: 16px;
    z-index: 99;
  }
  .mobile-nav-drawer.open {
    display: flex !important;
  }
  .hero-section {
    padding: 50px 0 40px;
  }
  .pipeline-flow {
    grid-template-columns: 1fr;
  }
  .labs-card {
    padding: 30px 20px;
  }
  .footer-top {
    flex-direction: column;
  }
  .footer-links-col {
    flex-direction: column;
    gap: 30px;
  }
}