/* ============================================
   Claude-inspired Design System
   Clean, warm, elegant
   ============================================ */

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #f9f8f6;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #5c5c5c;
  --text-tertiary: #8e8e8e;
  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-light: #fef3c7;
  --border: #e5e5e5;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --max-width: 1100px;
  --nav-height: 60px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  height: var(--nav-height);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-weight: 600;
  font-size: 18px;
  color: var(--text-primary);
}

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

.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

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

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

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

/* ---------- Hero ---------- */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  gap: 6px;
}

.btn-primary {
  background: var(--text-primary);
  color: #fff;
}

.btn-primary:hover {
  background: #333;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  border-color: #ccc;
  box-shadow: var(--shadow-sm);
}

.btn-text {
  background: none;
  color: var(--accent);
  padding: 8px 4px;
  font-size: 14px;
}

.btn-text:hover {
  color: var(--accent-hover);
}

/* ---------- Section ---------- */
.section-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  margin-bottom: 40px;
  letter-spacing: -0.01em;
}

.section-action {
  text-align: center;
  margin-top: 40px;
}

/* ---------- Features ---------- */
.features {
  padding: 60px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- Posts Grid ---------- */
.latest-posts {
  padding: 60px 0 80px;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: box-shadow 0.3s, transform 0.3s;
  display: flex;
  flex-direction: column;
}

.post-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.post-card .post-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-light);
  padding: 2px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
  width: fit-content;
}

.post-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}

.post-card p {
  font-size: 14px;
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card .post-meta {
  font-size: 12px;
  color: var(--text-tertiary);
}

.loading-text {
  color: var(--text-tertiary);
  text-align: center;
  padding: 40px;
}

/* ---------- Blog Page ---------- */
.blog-page {
  padding: 60px 0 80px;
}

.blog-header {
  text-align: center;
  margin-bottom: 48px;
}

.blog-header h1 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 8px;
}

.blog-header p {
  color: var(--text-secondary);
  font-size: 16px;
}

.blog-tags {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.blog-tags .tag-btn {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.blog-tags .tag-btn:hover,
.blog-tags .tag-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ---------- Blog Post Detail ---------- */
.post-detail {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}

.post-detail .back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.post-detail .back-link:hover {
  color: var(--accent);
}

.post-detail .post-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.post-detail .post-info {
  color: var(--text-tertiary);
  font-size: 13px;
  margin-bottom: 40px;
}

.post-detail .post-content {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-primary);
}

.post-detail .post-content h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 16px;
}

.post-detail .post-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 12px;
}

.post-detail .post-content p {
  margin-bottom: 16px;
}

.post-detail .post-content pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.6;
}

.post-detail .post-content code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 14px;
}

.post-detail .post-content :not(pre) > code {
  background: var(--bg-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}

.post-detail .post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 20px 0;
  color: var(--text-secondary);
}

.post-detail .post-content ul,
.post-detail .post-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.post-detail .post-content li {
  margin-bottom: 4px;
}

.post-detail .post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-detail .post-content img {
  border-radius: var(--radius-sm);
  margin: 20px 0;
}

/* ---------- Tools Page ---------- */
.tools-page {
  padding: 60px 0 80px;
}

.tools-header {
  text-align: center;
  margin-bottom: 48px;
}

.tools-header h1 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 8px;
}

.tools-header p {
  color: var(--text-secondary);
  font-size: 16px;
}

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

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.tool-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tool-card .tool-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.tool-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tool-card .tool-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.tool-card .tool-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}

.tool-card .tool-link:hover {
  color: var(--accent-hover);
}

.tool-card .tool-status {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 8px;
  vertical-align: middle;
}

.tool-status.online {
  background: #dcfce7;
  color: #16a34a;
}

.tool-status.dev {
  background: var(--accent-light);
  color: var(--accent);
}

/* ---------- About Page ---------- */
.about-page {
  padding: 60px 0 80px;
}

.about-content {
  max-width: 720px;
  margin: 0 auto;
}

.about-content h1 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  margin-bottom: 24px;
  text-align: center;
}

.about-content .about-text {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.about-content .about-text p {
  margin-bottom: 16px;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border-light);
  padding: 24px 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 0;
  }

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

  .nav-links a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 60px 0 48px;
  }

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

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