/* --- 现代化 CSS 变量与明暗自适应体系 (遵循 Modern Web Baseline) --- */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* 默认亮色模式色彩系统 */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-subtle: #edf2f7;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-primary: #6366f1;
  --accent-hover: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --code-block-border: #334155;

  color-scheme: light dark;
}

/* 系统暗黑模式自动适配 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --border-color: #1f293d;
    --border-subtle: #192233;
    --text-primary: #f9fafb;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --card-hover-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.25), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  }
}

/* 用户手动强制模式 (通过 data-theme) */
[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --border-color: #1f293d;
  --border-subtle: #192233;
  --text-primary: #f9fafb;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --card-hover-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.25), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-subtle: #edf2f7;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  color-scheme: light;
}

/* 基础全局重置 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* --- 顶部导航 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(var(--bg-secondary), 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.25s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.logo-icon {
  font-size: 1.4rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 320px;
}

.search-icon {
  position: absolute;
  left: 12px;
  font-size: 0.9rem;
  opacity: 0.6;
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 8px 36px 8px 34px;
  font-size: 0.88rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  outline: none;
  transition: all 0.2s ease;
}

.search-box input:focus {
  border-color: var(--accent-primary);
  background-color: var(--bg-secondary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.shortcut-key {
  position: absolute;
  right: 10px;
  padding: 2px 6px;
  font-size: 0.75rem;
  border-radius: 4px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--accent-primary);
}

.badge-link {
  padding: 4px 10px;
  border-radius: 9999px;
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary) !important;
}

.theme-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.15rem;
  transition: all 0.2s ease;
}

.theme-btn:hover {
  transform: scale(1.05);
  border-color: var(--accent-primary);
}

/* --- Hero Section --- */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.15), transparent 70%);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  box-shadow: 0 0 0 rgba(99, 102, 241, 0.4);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
  100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.25rem;
  max-width: 680px;
  margin: 0 auto 36px;
  color: var(--text-secondary);
}

.quote-card {
  max-width: 780px;
  margin: 0 auto 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px 36px;
  box-shadow: var(--card-shadow);
  text-align: left;
  position: relative;
}

.quote-quote {
  font-size: 3.5rem;
  line-height: 1;
  color: var(--accent-primary);
  opacity: 0.3;
  margin-bottom: -15px;
  font-family: Georgia, serif;
}

.quote-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.quote-author {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.9rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 12px;
}

.author-name {
  font-weight: 700;
  color: var(--text-primary);
}

.author-title {
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
}

.stat-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--card-shadow);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Section 通用样式 --- */
.section {
  padding: 80px 0;
}

.section-alt {
  background-color: var(--bg-tertiary);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* --- 对比卡片 (Philosophy) --- */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.comparison-card {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  position: relative;
}

.comparison-card.modern {
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--card-hover-shadow);
}

.card-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  margin-bottom: 16px;
}

.card-tag.tag-vibe {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
}

.comparison-card h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-list li {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 五步闭环 (Workflow) --- */
.workflow-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.step-card {
  background: var(--bg-secondary);
  border-radius: 14px;
  padding: 24px;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  position: relative;
  transition: transform 0.2s ease;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.step-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent-primary);
  opacity: 0.7;
  line-height: 1;
  margin-bottom: 12px;
}

.step-card h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.step-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* --- 神器矩阵 (Tools) --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 26px;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-hover-shadow);
  border-color: var(--accent-primary);
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.tool-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.tool-icon {
  font-size: 1.5rem;
}

.tool-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.tool-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.6;
}

.tool-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-tag {
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

/* --- 避坑指南 (Pitfalls) --- */
.pitfalls-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.pitfall-item {
  display: flex;
  gap: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--card-shadow);
}

.pitfall-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
}

.pitfall-body h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.pitfall-body p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Prompt 模版宝典 (Prompts) --- */
.prompts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(460px, 1fr));
  gap: 24px;
}

.prompt-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
}

.prompt-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.prompt-header h4 {
  font-size: 1.05rem;
}

.copy-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.code-box {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 8px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
  border: 1px solid var(--code-block-border);
}

/* --- 互动自测 (Quiz) --- */
.quiz-container {
  max-width: 680px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 36px;
  box-shadow: var(--card-hover-shadow);
}

.quiz-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 28px;
}

.quiz-progress {
  height: 100%;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

.quiz-q-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.quiz-q-text {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.98rem;
  color: var(--text-primary);
  transition: all 0.15s ease;
  text-align: left;
  width: 100%;
}

.quiz-option:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.quiz-result-box {
  text-align: center;
  padding: 20px 0;
}

.result-badge {
  font-size: 3.5rem;
  margin-bottom: 12px;
}

.result-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.result-score {
  font-size: 1.1rem;
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 16px;
}

.result-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 28px;
  line-height: 1.6;
}

/* --- 页脚 (Footer) --- */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  text-align: center;
  background: var(--bg-secondary);
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.server-badge {
  font-size: 0.82rem;
  opacity: 0.8;
}

/* --- Toast 弹窗 --- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: rgba(15, 23, 42, 0.9);
  color: #ffffff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.25s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* --- 移动端响应式断点 --- */
@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .nav-links { display: none; }
  .comparison-grid, .pitfalls-list { grid-template-columns: 1fr; }
  .prompts-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .search-box { max-width: 200px; }
}

/* ICP 备案信息 */
.icp-badge {
  margin-top: 8px;
  font-size: 0.8rem;
}
.icp-badge a {
  color: inherit;
  text-decoration: none;
}
.icp-badge a:hover {
  text-decoration: underline;
}