/* ===== CSS Variables & Reset ===== */
:root {
  --bg-primary: #faf9f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f3f1ed;
  --text-primary: #1a1a1a;
  --text-secondary: #5c5c5c;
  --text-muted: #8a8a8a;
  --accent: #c45d3a;
  --accent-hover: #a84d30;
  --accent-light: rgba(196, 93, 58, 0.12);
  --border: #e8e4df;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --font-serif: "Georgia", "Noto Serif SC", "Source Han Serif SC", serif;
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --header-height: 64px;
  --max-width: 1100px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #141414;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --text-primary: #f0ece6;
  --text-secondary: #b0aaa0;
  --text-muted: #787068;
  --accent: #e07a55;
  --accent-hover: #f09070;
  --accent-light: rgba(224, 122, 85, 0.15);
  --border: #333;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

main {
  flex: 1;
  padding: 32px 0 64px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--accent-light);
  border-color: var(--accent);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-primary);
  padding: 4px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: inherit;
}

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

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

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
}

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

.btn-danger {
  background: #dc3545;
  color: #fff;
}

.btn-danger:hover {
  background: #c82333;
  color: #fff;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 64px 0 48px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 28px;
}

/* ===== Search & Filter ===== */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 32px;
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-box::before {
  content: "🔍";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
  opacity: 0.5;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

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

/* ===== Article Cards ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

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

.card-cover {
  height: 180px;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  opacity: 0.3;
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.card-category {
  color: var(--accent);
  font-weight: 500;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 10px;
}

.card-title a {
  color: var(--text-primary);
}

.card-title a:hover {
  color: var(--accent);
}

.card-excerpt {
  color: var(--text-secondary);
  font-size: 0.92rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

/* ===== Article Detail ===== */
.article-detail {
  max-width: 760px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 32px;
}

.article-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.article-cover {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.article-content {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 32px 0 16px;
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 24px 0 12px;
}

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

.article-content blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}

.article-content code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.9em;
}

.article-content pre {
  background: var(--bg-tertiary);
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 20px 0;
}

.article-content pre code {
  background: none;
  padding: 0;
}

.article-content ul,
.article-content ol {
  margin: 12px 0 16px 24px;
}

.article-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ===== Comments ===== */
.comments-section {
  max-width: 760px;
  margin: 48px auto 0;
}

.comments-section h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin-bottom: 24px;
}

.comment-form {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

.comment-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.comment-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.comment-author {
  font-weight: 600;
  font-size: 0.95rem;
}

.comment-date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.comment-body {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.no-comments {
  text-align: center;
  padding: 32px;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ===== Write / Upload Page ===== */
.write-page {
  max-width: 800px;
  margin: 0 auto;
}

.write-page h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 8px;
}

.write-page .subtitle {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.editor-toolbar button {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.editor-toolbar button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.content-editor {
  min-height: 320px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.cover-preview {
  margin-top: 12px;
  max-width: 300px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: none;
}

.cover-preview.visible {
  display: block;
}

.cover-preview img {
  width: 100%;
  display: block;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

/* ===== About Page ===== */
.about-page {
  max-width: 720px;
  margin: 0 auto;
}

.about-hero {
  text-align: center;
  margin-bottom: 48px;
}

.about-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin: 0 auto 20px;
  border: 3px solid var(--accent);
}

.about-hero h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 8px;
}

.about-hero .role {
  color: var(--accent);
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.about-hero .bio {
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

.about-section {
  margin-bottom: 40px;
}

.about-section h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-light);
}

.about-section p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.contact-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 40px 0;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Sidebar (archive) ===== */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-widget {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}

.sidebar-widget h3 {
  font-size: 1rem;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.sidebar-list {
  list-style: none;
}

.sidebar-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.sidebar-list a:hover {
  color: var(--accent);
}

.sidebar-list .count {
  float: right;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.site-footer a {
  color: var(--text-secondary);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 24px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
}

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

.toast.success {
  background: #28a745;
  color: #fff;
}

.toast.error {
  background: #dc3545;
  color: #fff;
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination button {
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  font-family: inherit;
  transition: all var(--transition);
}

.pagination button:hover,
.pagination button.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px;
    gap: 4px;
  }

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

  .menu-toggle {
    display: block;
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding: 40px 0 32px;
  }
}