/* ===== MD3 Design Tokens ===== */
:root {
  /* Primary palette */
  --md-primary: #cfbeff;
  --md-on-primary: #22005d;
  --md-primary-container: #3e1f95;
  --md-on-primary-container: #e9deff;

  /* Secondary */
  --md-secondary: #cbc2db;
  --md-on-secondary: #332d41;
  --md-secondary-container: #4a4458;
  --md-on-secondary-container: #e8def8;

  /* Tertiary */
  --md-tertiary: #efb8c8;
  --md-on-tertiary: #4a2532;
  --md-tertiary-container: #633b48;
  --md-on-tertiary-container: #ffd8e4;

  /* Surface & Background */
  --md-background: #141218;
  --md-on-background: #e6e0e9;
  --md-surface: #141218;
  --md-on-surface: #e6e0e9;
  --md-surface-variant: #49454f;
  --md-on-surface-variant: #cac4d0;

  /* Surface levels */
  --md-surface-1: #1d1b20;
  --md-surface-2: #211f26;
  --md-surface-3: #2b2930;
  --md-surface-4: #302d38;
  --md-surface-5: #36343b;

  /* Outline */
  --md-outline: #938f99;
  --md-outline-variant: #49454f;

  /* Error */
  --md-error: #ffb4ab;
  --md-on-error: #690005;
  --md-error-container: #93000a;
  --md-on-error-container: #ffb4ab;

  /* Success */
  --md-success: #6dd58c;
  --md-on-success: #003919;

  /* Elevation overlays */
  --elevation-1: rgba(207, 190, 255, 0.05);
  --elevation-2: rgba(207, 190, 255, 0.08);
  --elevation-3: rgba(207, 190, 255, 0.11);
  --elevation-4: rgba(207, 190, 255, 0.12);

  /* Typography */
  --font-sans: 'Noto Sans SC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Shape */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Motion */
  --duration-short: 200ms;
  --duration-medium: 300ms;
  --duration-long: 400ms;
  --easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --easing-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--md-background);
  color: var(--md-on-background);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--md-primary); text-decoration: none; }
img { max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== Material Symbols ===== */
.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  font-size: 1.25rem;
  line-height: 1;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
}

/* ===== App Shell ===== */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ===== Navigation Rail ===== */
.nav-rail {
  width: 240px;
  min-width: 240px;
  background: var(--md-surface-2);
  border-right: 1px solid var(--md-outline-variant);
  display: flex;
  flex-direction: column;
  padding: 24px 12px;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
  transition: transform var(--duration-medium) var(--easing-standard);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin-bottom: 24px;
  cursor: pointer;
  border-radius: var(--radius-lg);
  transition: background var(--duration-short) var(--easing-standard);
}

.nav-brand:hover { background: var(--elevation-1); }

.brand-icon {
  font-size: 2rem !important;
  color: var(--md-primary);
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 40;
}

.brand-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: -0.02em;
}

.nav-items {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  color: var(--md-on-surface-variant);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  transition: all var(--duration-short) var(--easing-standard);
  position: relative;
  cursor: pointer;
}

.nav-item:hover {
  background: var(--elevation-1);
  color: var(--md-on-surface);
}

.nav-item-active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.nav-item-active .nav-item-icon {
  font-variation-settings: 'FILL' 1, 'wght' 500, 'GRAD' 0, 'opsz' 24;
}

.nav-item-icon {
  font-size: 1.25rem !important;
  transition: font-variation-settings var(--duration-short);
}

.nav-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--md-outline-variant);
}

.nav-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--md-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-on-primary-container);
}

/* ===== Main Content ===== */
.main-content {
  margin-left: 240px;
  flex: 1;
  min-height: 100vh;
  padding: 40px;
}

.content-wrapper {
  max-width: 1100px;
  margin: 0 auto;
}

/* ===== Buttons ===== */
.md-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all var(--duration-short) var(--easing-standard);
  cursor: pointer;
  border: none;
  font-family: inherit;
  white-space: nowrap;
}

.md-button:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.md-button-filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.md-button-filled:hover:not(:disabled) {
  background: color-mix(in srgb, var(--md-primary) 92%, white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.md-button-outlined {
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}

.md-button-outlined:hover:not(:disabled) {
  background: var(--elevation-1);
}

.md-button-text {
  background: transparent;
  color: var(--md-primary);
  padding: 10px 12px;
}

.md-button-text:hover:not(:disabled) {
  background: var(--elevation-1);
}

.md-button.danger { color: var(--md-error); border-color: var(--md-error); }
.md-button-filled.danger { background: var(--md-error-container); color: var(--md-on-error-container); }

/* ===== Home Page ===== */
.home-page { display: flex; flex-direction: column; gap: 60px; }

.hero-section {
  position: relative;
  background: linear-gradient(135deg, var(--md-surface-3) 0%, var(--md-surface-2) 100%);
  border-radius: var(--radius-xl);
  padding: 64px 56px;
  overflow: hidden;
  border: 1px solid var(--md-outline-variant);
}

.hero-content { position: relative; z-index: 2; max-width: 560px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--md-on-surface);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.hero-accent {
  background: linear-gradient(135deg, var(--md-primary), var(--md-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--md-on-surface-variant);
  font-size: 1rem;
  margin-bottom: 32px;
  line-height: 1.7;
}

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

.hero-decoration {
  position: absolute;
  top: 0; right: 0;
  bottom: 0; width: 45%;
  pointer-events: none;
}

.hero-circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0.15;
}

.hero-circle-1 {
  width: 280px; height: 280px;
  top: -40px; right: -40px;
  background: radial-gradient(circle, var(--md-primary), transparent);
}

.hero-circle-2 {
  width: 180px; height: 180px;
  bottom: -20px; right: 120px;
  background: radial-gradient(circle, var(--md-tertiary), transparent);
}

.hero-circle-3 {
  width: 120px; height: 120px;
  top: 60px; right: 180px;
  background: radial-gradient(circle, var(--md-secondary), transparent);
}

/* Stats */
.stats-section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--duration-medium) var(--easing-emphasized);
}

.stat-card:hover {
  background: var(--md-surface-3);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.stat-icon {
  font-size: 2rem !important;
  color: var(--md-primary);
  margin-bottom: 8px;
  font-variation-settings: 'FILL' 1, 'wght' 300, 'GRAD' 0, 'opsz' 40;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
}

/* Section */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: -0.02em;
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* ===== Article Card ===== */
.article-card {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--duration-medium) var(--easing-emphasized);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-card:hover {
  background: var(--md-surface-3);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
  border-color: var(--md-primary);
}

.article-card:hover .card-hover-line {
  width: 100%;
}

.card-hover-line {
  position: absolute;
  bottom: 0; left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--md-primary), var(--md-tertiary));
  transition: width var(--duration-long) var(--easing-emphasized);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

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

.card-tag {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.card-meta-top {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--md-on-surface-variant);
  font-size: 0.75rem;
  flex-shrink: 0;
}

.card-body { flex: 1; }

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--md-on-surface);
  line-height: 1.4;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-summary {
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--md-outline-variant);
}

.card-author {
  display: flex;
  align-items: center;
  gap: 8px;
}

.author-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--md-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-on-primary-container);
  font-size: 0.85rem;
}

.author-avatar .material-symbols-rounded { font-size: 0.9rem !important; }

.author-name {
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
  font-weight: 500;
}

.card-date {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
}

.card-date .material-symbols-rounded { font-size: 0.85rem !important; }

/* Tags cloud */
.tags-cloud { display: flex; flex-wrap: wrap; gap: 10px; }

.tag-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--md-surface-3);
  border: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-variant);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-short) var(--easing-standard);
  font-family: inherit;
}

.tag-chip:hover {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: var(--md-primary);
}

/* ===== Articles Page ===== */
.articles-page { display: flex; flex-direction: column; gap: 32px; }

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.page-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: -0.03em;
}

.page-title .material-symbols-rounded {
  font-size: 2rem !important;
  color: var(--md-primary);
}

.page-subtitle {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  margin-top: 4px;
}

/* Filters */
.filters-bar { display: flex; flex-direction: column; gap: 16px; }

.search-field {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 16px;
  color: var(--md-on-surface-variant);
}

.search-input {
  width: 100%;
  max-width: 480px;
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-full);
  color: var(--md-on-surface);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 12px 48px;
  outline: none;
  transition: all var(--duration-short) var(--easing-standard);
}

.search-input:focus {
  border-color: var(--md-primary);
  background: var(--md-surface-3);
}

.search-clear {
  position: absolute;
  right: 12px;
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 50%;
  transition: background var(--duration-short);
}

.search-clear:hover { background: var(--elevation-2); }

.tag-filters { display: flex; flex-wrap: wrap; gap: 8px; }

.tag-filter-chip {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-variant);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-short) var(--easing-standard);
  font-family: inherit;
}

.tag-filter-chip:hover, .tag-filter-chip.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: var(--md-primary);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-short) var(--easing-standard);
  font-family: inherit;
  padding: 0 12px;
}

.page-btn:hover:not(:disabled) {
  background: var(--md-surface-3);
  color: var(--md-on-surface);
}

.page-btn-active {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
}

.page-btn:disabled { opacity: 0.38; cursor: not-allowed; }

/* ===== Article Detail ===== */
.article-detail { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 32px; }

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--md-on-surface-variant);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px 8px 8px;
  border-radius: var(--radius-full);
  transition: all var(--duration-short) var(--easing-standard);
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

.back-btn:hover {
  background: var(--elevation-1);
  color: var(--md-on-surface);
}

.detail-header {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-xl);
  padding: 40px;
}

.detail-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }

.detail-title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1.3;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--md-on-surface-variant);
  font-size: 0.85rem;
}

.meta-item .material-symbols-rounded { font-size: 1rem !important; }

.detail-body {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-xl);
  padding: 40px;
}

/* Markdown content */
.article-content { line-height: 1.8; color: var(--md-on-surface); }

.article-content h1, .article-content h2, .article-content h3,
.article-content h4, .article-content h5, .article-content h6 {
  color: var(--md-on-surface);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2em 0 0.75em;
  line-height: 1.3;
}

.article-content h1 { font-size: 1.875rem; border-bottom: 1px solid var(--md-outline-variant); padding-bottom: 0.5em; }
.article-content h2 { font-size: 1.5rem; }
.article-content h3 { font-size: 1.2rem; }

.article-content p { margin: 1em 0; }

.article-content a { color: var(--md-primary); text-decoration: underline; text-underline-offset: 3px; }

.article-content strong { color: var(--md-on-surface); font-weight: 700; }
.article-content em { color: var(--md-tertiary); }

.article-content code {
  background: var(--md-surface-4);
  color: var(--md-primary);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.article-content pre {
  background: var(--md-surface-4);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-md);
  padding: 20px;
  overflow-x: auto;
  margin: 1.5em 0;
}

.article-content pre code {
  background: none;
  color: var(--md-on-surface);
  padding: 0;
  font-size: 0.875rem;
}

.article-content blockquote {
  border-left: 3px solid var(--md-primary);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--md-surface-3);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--md-on-surface-variant);
  font-style: italic;
}

.article-content ul, .article-content ol {
  padding-left: 1.5em;
  margin: 1em 0;
}

.article-content li { margin: 0.4em 0; }

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
}

.article-content th, .article-content td {
  border: 1px solid var(--md-outline-variant);
  padding: 10px 16px;
  text-align: left;
}

.article-content th {
  background: var(--md-surface-3);
  font-weight: 600;
  color: var(--md-on-surface);
}

.article-content hr {
  border: none;
  border-top: 1px solid var(--md-outline-variant);
  margin: 2em 0;
}

.detail-actions { display: flex; gap: 12px; }

/* ===== Editor ===== */
.editor-page { display: flex; flex-direction: column; gap: 24px; }

.editor-header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.editor-header .page-title { flex: 1; }

.editor-actions { display: flex; gap: 12px; margin-left: auto; }

.editor-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.editor-layout.preview-mode {
  grid-template-columns: 1fr 1fr;
}

.editor-form { display: flex; flex-direction: column; gap: 20px; }

.form-field { display: flex; flex-direction: column; gap: 8px; }

.field-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.md-input, .md-textarea {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-sm);
  color: var(--md-on-surface);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 12px 16px;
  outline: none;
  transition: all var(--duration-short) var(--easing-standard);
  width: 100%;
}

.md-input:focus, .md-textarea:focus {
  border-color: var(--md-primary);
  background: var(--md-surface-3);
}

.md-textarea { resize: vertical; line-height: 1.6; }

.content-editor {
  min-height: 400px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.input-error { border-color: var(--md-error) !important; }

.field-error {
  font-size: 0.8rem;
  color: var(--md-error);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Tags input */
.tag-input-container { display: flex; flex-direction: column; gap: 8px; }

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

.tag-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  padding: 4px 8px 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}

.tag-badge button {
  display: flex;
  align-items: center;
  color: inherit;
  opacity: 0.7;
  padding: 2px;
  border-radius: 50%;
  transition: opacity var(--duration-short);
}

.tag-badge button:hover { opacity: 1; }
.tag-badge button .material-symbols-rounded { font-size: 0.9rem !important; }

.tag-input { max-width: 300px; }

/* Toggle switch */
.toggle-label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--md-on-surface-variant);
  user-select: none;
}

.md-switch {
  width: 52px; height: 28px;
  border-radius: var(--radius-full);
  background: var(--md-outline);
  position: relative;
  cursor: pointer;
  transition: background var(--duration-short) var(--easing-standard);
  flex-shrink: 0;
}

.md-switch.switch-on { background: var(--md-primary); }

.switch-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--md-on-primary);
  position: absolute;
  top: 4px; left: 4px;
  transition: all var(--duration-short) var(--easing-emphasized);
}

.md-switch.switch-on .switch-thumb {
  left: calc(100% - 24px);
  background: var(--md-on-primary);
}

/* Preview panel */
.preview-panel {
  background: var(--md-surface-2);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg);
  padding: 32px;
  overflow-y: auto;
  max-height: 80vh;
}

.preview-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--md-on-surface-variant);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.preview-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--md-on-surface);
  margin-bottom: 24px;
  border-bottom: 1px solid var(--md-outline-variant);
  padding-bottom: 16px;
}

/* ===== Alerts ===== */
.alert {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
}

.alert-error {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
}

.alert-success {
  background: color-mix(in srgb, var(--md-success) 20%, transparent);
  color: var(--md-success);
  border: 1px solid color-mix(in srgb, var(--md-success) 30%, transparent);
}

/* ===== Dialogs ===== */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn var(--duration-short) var(--easing-standard);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.dialog {
  background: var(--md-surface-4);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  border: 1px solid var(--md-outline-variant);
  animation: slideUp var(--duration-medium) var(--easing-emphasized);
}

@keyframes slideUp { from { transform: translateY(24px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.dialog-icon .material-symbols-rounded {
  font-size: 3rem !important;
  color: var(--md-tertiary);
  font-variation-settings: 'FILL' 1, 'wght' 300, 'GRAD' 0, 'opsz' 48;
}

.dialog-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-on-surface);
  margin: 12px 0 8px;
}

.dialog-message {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  margin-bottom: 24px;
}

.dialog-actions { display: flex; gap: 12px; justify-content: flex-end; }

/* ===== Loading / Skeleton ===== */
.app-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 16px;
  color: var(--md-on-surface-variant);
}

.loading-spinner svg { width: 48px; height: 48px; color: var(--md-primary); }

.loading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.skeleton-card {
  background: var(--md-surface-2);
  border-radius: var(--radius-lg);
  height: 220px;
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.skeleton-detail-header {
  background: var(--md-surface-2);
  border-radius: var(--radius-xl);
  height: 200px;
  margin-bottom: 24px;
  animation: pulse 1.8s ease-in-out infinite;
}

.skeleton-detail-body {
  background: var(--md-surface-2);
  border-radius: var(--radius-xl);
  height: 400px;
  animation: pulse 1.8s ease-in-out infinite;
  animation-delay: 0.2s;
}

.detail-loading { max-width: 800px; margin: 0 auto; }

/* ===== Empty State ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 80px 40px;
  text-align: center;
  color: var(--md-on-surface-variant);
}

.empty-state .material-symbols-rounded {
  font-size: 4rem !important;
  color: var(--md-outline);
  font-variation-settings: 'FILL' 0, 'wght' 200, 'GRAD' 0, 'opsz' 48;
}

.empty-state p { font-size: 1rem; color: var(--md-on-surface-variant); }

.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 80px;
  text-align: center;
}

/* ===== Spinner button ===== */
.btn-loading {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Blazor error UI ===== */
#blazor-error-ui {
  display: none;
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  padding: 12px 20px;
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  z-index: 1000;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-rail {
    width: 72px;
    min-width: 72px;
    padding: 16px 8px;
  }

  .brand-text, .nav-item-label { display: none; }

  .nav-brand { justify-content: center; padding: 12px; }

  .nav-item { justify-content: center; padding: 12px; }

  .main-content { margin-left: 72px; padding: 24px 20px; }

  .hero-section { padding: 40px 32px; }
  .hero-decoration { display: none; }
  .stats-section { grid-template-columns: repeat(3, 1fr); }
  .editor-layout.preview-mode { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .main-content { margin-left: 0; padding: 16px; }
  .nav-rail { display: none; }
  .articles-grid { grid-template-columns: 1fr; }
  .stats-section { grid-template-columns: repeat(3, 1fr); }
  .page-header { flex-direction: column; align-items: flex-start; }
}