/* ============================================
   main.css — 布局、排版、组件、响应式
   Java 后端学习登山指南
   ============================================ */

/* ---- Custom Properties ---- */
:root {
  --color-bg: #f8f7f4;
  --color-surface: #ffffff;
  --color-text: #2d3748;
  --color-text-muted: #718096;
  --color-text-light: #a0aec0;
  --color-primary: #2b6cb0;
  --color-primary-light: #ebf4ff;
  --color-accent: #38a169;
  --color-accent-light: #f0fff4;
  --color-warning: #d69e2e;
  --color-warning-light: #fffff0;
  --color-danger: #e53e3e;
  --color-code-bg: #1a202c;
  --color-code-text: #e2e8f0;
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;
  --color-story: #ebf8ff;
  --color-story-border: #3182ce;
  --color-analogy: #fffbeb;
  --color-analogy-border: #d69e2e;
  --color-checkpoint: #f0fff4;
  --color-checkpoint-border: #38a169;
  --color-tier-1: #38a169;
  --color-tier-2: #dd6b20;
  --color-tier-3: #3182ce;
  --sidebar-width: 280px;
  --content-max: 800px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", "JetBrains Mono", "Consolas", monospace;
}

/* ---- Dark Theme ---- */
[data-theme="dark"] {
  --color-bg: #1a202c;
  --color-surface: #2d3748;
  --color-text: #e2e8f0;
  --color-text-muted: #a0aec0;
  --color-text-light: #718096;
  --color-primary: #63b3ed;
  --color-primary-light: rgba(99, 179, 237, 0.15);
  --color-accent: #68d391;
  --color-accent-light: rgba(104, 211, 145, 0.15);
  --color-warning: #fbd38d;
  --color-warning-light: rgba(251, 211, 141, 0.1);
  --color-danger: #fc8181;
  --color-code-bg: #0d1117;
  --color-code-text: #e2e8f0;
  --color-border: #4a5568;
  --color-border-light: #2d3748;
  --color-story: rgba(99, 179, 237, 0.1);
  --color-story-border: #63b3ed;
  --color-analogy: rgba(251, 211, 141, 0.1);
  --color-analogy-border: #fbd38d;
  --color-checkpoint: rgba(104, 211, 145, 0.1);
  --color-checkpoint-border: #68d391;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

/* ---- 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(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "sidebar progress"
    "sidebar content";
}

/* ---- Progress Bar ---- */
.progress-bar {
  grid-area: progress;
  height: 4px;
  background: var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-tier-1) 0%, var(--color-tier-2) 50%, var(--color-tier-3) 100%);
  width: 0%;
  transition: width 0.4s ease;
}

/* ---- Sidebar ---- */
.sidebar {
  grid-area: sidebar;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  overflow-x: hidden;
  height: 100vh;
  position: sticky;
  top: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

#sidebar-content {
  padding: 1.5rem 1rem 2rem;
  flex: 1;
  overflow-y: auto;
}

/* Sidebar Header */
.sidebar-header {
  text-align: center;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-header h1 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.sidebar-header .subtitle {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.15rem;
}

/* Mountain Visual */
.mountain-visual {
  margin: 0.75rem 0 1rem;
  text-align: center;
  position: relative;
}

.mountain-visual svg {
  width: 100%;
  max-width: 200px;
  height: auto;
}

/* Tier Groups */
.tier-group {
  margin-bottom: 0.5rem;
}

.tier-header {
  display: flex;
  align-items: center;
  padding: 0.6rem 0.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
  user-select: none;
}

.tier-header:hover {
  background: var(--color-border-light);
}

.tier-header .tier-icon {
  font-size: 1.1rem;
  margin-right: 0.4rem;
}

.tier-header .tier-label {
  flex: 1;
}

.tier-header .tier-camp {
  font-size: 0.65rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tier-header .tier-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.tier-header .tier-arrow {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  transition: transform 0.2s;
}

.tier-header.collapsed .tier-arrow {
  transform: rotate(-90deg);
}

.tier-progress-mini {
  height: 3px;
  background: var(--color-border-light);
  border-radius: 2px;
  margin: 0 0.5rem 0.4rem;
  overflow: hidden;
}

.tier-progress-mini-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.3s ease;
}

.tier-progress-mini-fill.tier-1 { background: var(--color-tier-1); }
.tier-progress-mini-fill.tier-2 { background: var(--color-tier-2); }
.tier-progress-mini-fill.tier-3 { background: var(--color-tier-3); }

/* Lesson List */
.lesson-list {
  list-style: none;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.tier-header.collapsed + .tier-progress-mini + .lesson-list,
.tier-header.collapsed + .lesson-list {
  max-height: 0 !important;
}

.lesson-item {
  display: flex;
  align-items: center;
  padding: 0.45rem 0.5rem 0.45rem 1.8rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  color: var(--color-text-muted);
  transition: all 0.15s;
  position: relative;
}

.lesson-item:hover {
  background: var(--color-border-light);
  color: var(--color-text);
}

.lesson-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.lesson-item .lesson-check {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  margin-right: 0.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  transition: all 0.2s;
}

.lesson-item.completed .lesson-check {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

.lesson-item .lesson-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-item .lesson-time {
  font-size: 0.7rem;
  color: var(--color-text-light);
  margin-left: 0.4rem;
}

/* Sidebar Stats */
.sidebar-stats {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-light);
  text-align: center;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.sidebar-stats .stats-number {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 0.5rem 1rem 0.75rem;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
}

.theme-toggle {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s;
}

.theme-toggle:hover {
  color: var(--color-primary);
}

.footer-sep {
  color: var(--color-border);
  font-size: 0.78rem;
}

.logout-link {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s;
}

.logout-link:hover {
  color: var(--color-danger);
}

/* Sidebar Toggle Button */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.sidebar-overlay {
  display: none;
}

/* ---- Content Area ---- */
.content {
  grid-area: content;
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
  min-height: 100vh;
}

.content-loading {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.breadcrumb span {
  color: var(--color-text-light);
  margin: 0 0.3rem;
}

/* Lesson Header */
.lesson-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--color-border-light);
}

.lesson-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.lesson-meta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.lesson-meta .badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-level {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-time {
  background: var(--color-border-light);
  color: var(--color-text-muted);
}

.badge-prereq {
  background: var(--color-warning-light);
  color: var(--color-warning);
  font-weight: 500;
}

/* ---- Section Cards ---- */
.section {
  margin-bottom: 1.75rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.section-icon {
  font-size: 1.3rem;
}

/* Story */
.section-story {
  border-left: 4px solid var(--color-story-border);
  background: var(--color-story);
}

.section-story .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-story-border);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.section-story p {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--color-text);
}

.section-story .story-title {
  margin-bottom: 0.5rem;
}

/* Code Demo */
.section-code-demo {
  background: var(--color-surface);
}

.section-code-demo .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.section-code-demo .demo-desc {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.code-block-wrapper {
  position: relative;
  margin: 0.75rem 0;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
}

.copy-btn:hover {
  background: rgba(255,255,255,0.2);
  color: white;
}

.code-block {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.65;
}

.code-block pre {
  padding: 1.25rem;
  margin: 0;
  font-family: var(--font-mono);
  white-space: pre;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  display: block;
  white-space: pre;
}

.code-output {
  margin-top: 0.75rem;
}

.output-toggle {
  font-size: 0.82rem;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-sans);
  padding: 0;
}

.output-toggle:hover {
  text-decoration: underline;
}

.output-content {
  display: none;
  margin-top: 0.5rem;
  padding: 0.75rem 1rem;
  background: #f7fafc;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text);
  white-space: pre-wrap;
  border: 1px solid var(--color-border);
}

.output-content.open {
  display: block;
}

/* Three Questions */
.section-three-questions {
  background: linear-gradient(135deg, #f0fff4 0%, #ebf8ff 50%, #fffbeb 100%);
  border: 1px solid var(--color-border);
}

.three-q-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.three-q-card {
  padding: 1rem 1.1rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  border: 1px solid var(--color-border-light);
}

.three-q-card .q-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: block;
}

.three-q-card .q-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.three-q-card .q-answer {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  text-align: left;
}

/* Rich text (trusted course HTML in story / three-questions / analogy / practice) */
.rich-text strong {
  color: var(--color-text);
  font-weight: 600;
}

.rich-text code {
  background: rgba(49, 130, 206, 0.1);
  color: var(--color-primary);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: var(--font-mono);
}

.section-story .rich-text code {
  background: rgba(49, 130, 206, 0.15);
}

.rich-text ul,
.rich-text ol {
  margin: 0.5rem 0 0.5rem 1.25rem;
}

.rich-text li {
  margin-bottom: 0.35rem;
}

.rich-text p + p {
  margin-top: 0.75rem;
}

/* Explanation */
.section-explanation {
  background: var(--color-surface);
}

.section-explanation .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.section-explanation p {
  margin-bottom: 0.75rem;
}

.section-explanation ul, .section-explanation ol {
  margin: 0.5rem 0 0.75rem 1.5rem;
}

.section-explanation li {
  margin-bottom: 0.35rem;
}

.section-explanation strong,
.explanation-body strong {
  color: var(--color-text);
}

.ascii-art {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.4;
  background: var(--color-border-light);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  white-space: pre;
  overflow-x: auto;
  color: var(--color-text);
  margin: 0.75rem 0;
}

/* Analogy */
.section-analogy {
  border-left: 4px solid var(--color-analogy-border);
  background: var(--color-analogy);
  font-style: italic;
}

.section-analogy .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-analogy-border);
  font-weight: 600;
  font-style: normal;
  margin-bottom: 0.5rem;
}

.section-analogy blockquote {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
}

/* Practice */
.section-practice {
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
}

.section-practice .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.task-list {
  list-style: none;
  counter-reset: task;
}

.task-item {
  counter-increment: task;
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--color-border-light);
  border-radius: var(--radius-sm);
}

.task-item::before {
  content: "练习 " counter(task);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.3rem;
}

.task-item .task-desc {
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
}

.task-hint-toggle {
  font-size: 0.78rem;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
}

.task-hint-toggle:hover {
  text-decoration: underline;
}

.task-hint {
  display: none;
  margin-top: 0.4rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-warning-light);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--color-text);
}

.task-hint.open {
  display: block;
}

.task-done {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.task-done input {
  cursor: pointer;
}

/* Checkpoint */
.section-checkpoint {
  background: var(--color-checkpoint);
  border-left: 4px solid var(--color-checkpoint-border);
}

.section-checkpoint .section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-checkpoint-border);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.checkpoint-item {
  margin-bottom: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.checkpoint-q {
  padding: 0.75rem 1rem;
  cursor: pointer;
  background: var(--color-surface);
  font-weight: 600;
  font-size: 0.92rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s;
}

.checkpoint-q:hover {
  background: var(--color-border-light);
}

.checkpoint-q::after {
  content: "▼";
  font-size: 0.65rem;
  color: var(--color-text-muted);
  transition: transform 0.2s;
}

.checkpoint-item.open .checkpoint-q::after {
  transform: rotate(180deg);
}

.checkpoint-a {
  display: none;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

.checkpoint-item.open .checkpoint-a {
  display: block;
}

.checkpoint-self-grade {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 1rem;
}

.checkpoint-self-grade label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

/* ---- Lesson Navigation ---- */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
}

.lesson-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
  text-decoration: none;
}

.lesson-nav-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lesson-nav-btn:disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

/* Mark Complete Button */
.mark-complete-btn {
  display: block;
  margin: 1.5rem auto 0;
  padding: 0.6rem 2rem;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
}

.mark-complete-btn:hover {
  background: #2f855a;
}

.mark-complete-btn.completed {
  background: var(--color-border-light);
  color: var(--color-text-muted);
}

.mark-complete-btn.completed:hover {
  background: #fed7d7;
  color: var(--color-danger);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;
    grid-template-areas:
      "progress"
      "content";
  }

  .sidebar-toggle {
    display: block;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    z-index: 300;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 250;
  }

  .sidebar-overlay.open {
    display: block;
  }

  .content {
    padding: 2rem 1rem 4rem;
  }

  .three-q-grid {
    grid-template-columns: 1fr;
  }

  .lesson-header h2 {
    font-size: 1.4rem;
  }
}

@media (max-width: 480px) {
  .content {
    padding: 1.5rem 0.75rem 3rem;
  }

  .section {
    padding: 1rem;
  }

  .lesson-nav {
    flex-direction: column;
    gap: 0.5rem;
  }

  .lesson-nav-btn {
    justify-content: center;
  }
}

/* ---- Print ---- */
@media print {
  .sidebar, .sidebar-toggle, .sidebar-overlay, .progress-bar, .lesson-nav, .mark-complete-btn {
    display: none !important;
  }

  body {
    display: block;
  }

  .content {
    max-width: 100%;
    padding: 1rem;
  }
}

/* ---- Dark theme component overrides ---- */
[data-theme="dark"] .section-three-questions {
  background: linear-gradient(135deg, rgba(104,211,145,0.08) 0%, rgba(99,179,237,0.08) 50%, rgba(251,211,141,0.08) 100%);
}

[data-theme="dark"] .three-q-card {
  background: rgba(255,255,255,0.05);
}

[data-theme="dark"] .output-content {
  background: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .mark-complete-btn.completed:hover {
  background: rgba(252,129,129,0.3);
}

[data-theme="dark"] :not(pre) > code {
  background: var(--color-border-light);
  color: var(--color-primary);
}

[data-theme="dark"] .section-story code,
[data-theme="dark"] .section-analogy code,
[data-theme="dark"] .rich-text code {
  background: rgba(99,179,237,0.15);
  color: var(--color-primary);
}

[data-theme="dark"] .sidebar-toggle {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .task-item {
  background: var(--color-border-light);
}

[data-theme="dark"] .task-hint {
  background: var(--color-warning-light);
}