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

:root {
  --color-bg: #faf8f5;
  --color-surface: #ffffff;
  --color-surface-alt: #f3efe8;
  --color-primary: #5b4a3f;
  --color-primary-light: #7a6b5e;
  --color-primary-dark: #3e322b;
  --color-accent: #8b6f4e;
  --color-accent-light: #a68b6b;
  --color-text: #2c2420;
  --color-text-secondary: #6b5e56;
  --color-text-muted: #9a8e85;
  --color-border: #e0d8cf;
  --color-border-light: #ece6dd;
  --color-success: #4a7c59;
  --color-success-light: #e8f0ea;
  --color-warning: #b8860b;
  --color-warning-light: #fdf6e3;
  --color-danger: #a0403a;
  --color-danger-light: #f5eaea;
  --color-focus: #5b4a3f;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-size: 0.875rem;
}
.skip-link:focus { top: 16px; }

/* ===== Header ===== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  flex-shrink: 0;
}
.logo:hover { text-decoration: none; }
.logo-icon { flex-shrink: 0; }

.main-nav {
  display: flex;
  gap: 20px;
  align-items: center;
}
.main-nav a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.main-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

/* ===== Hero ===== */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #fff;
  padding: 48px 0 44px;
}

.hero-content h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero-sub {
  font-size: 1.05rem;
  opacity: 0.88;
  max-width: 640px;
  line-height: 1.6;
}

/* ===== Setup Section ===== */
.setup-section {
  padding: 40px 0;
}

.setup-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.setup-card h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.setup-help {
  color: var(--color-text-secondary);
  font-size: 0.925rem;
  margin-bottom: 24px;
}

.setup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 0.85rem; font-weight: 600; color: var(--color-text-secondary); }
.field-select, .field-input {
  padding: 10px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.field-select:focus, .field-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(139,111,78,0.15);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}
.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover:not(:disabled) { background: var(--color-primary-dark); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-secondary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-secondary:hover { background: var(--color-accent-light); }
.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-surface-alt); color: var(--color-text); }
.btn-danger-ghost {
  background: transparent;
  color: var(--color-danger);
  border-color: var(--color-border);
}
.btn-danger-ghost:hover { background: var(--color-danger-light); }

/* ===== Checklist Section ===== */
.checklist-section { padding: 20px 0 60px; }

.checklist-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

.checklist-header {
  margin-bottom: 16px;
}

.checklist-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-border-light);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--color-success);
  border-radius: 4px;
  transition: width 0.4s ease;
  width: 0%;
}

.progress-text {
  font-size: 0.825rem;
  color: var(--color-text-muted);
}

.checklist-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.checklist-container { display: flex; flex-direction: column; gap: 16px; }

.task-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.task-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--color-surface-alt);
  cursor: pointer;
  user-select: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

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

.task-group-header:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.group-toggle {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.group-toggle.collapsed { transform: rotate(-90deg); }

.group-count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-left: auto;
  background: var(--color-surface);
  padding: 2px 8px;
  border-radius: 10px;
}

.task-group-body {
  padding: 8px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.task-group-body[hidden] { display: none; }

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.task-item:last-child { border-bottom: none; }

.task-checkbox {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--color-success);
  cursor: pointer;
}

.task-content { flex: 1; min-width: 0; }

.task-label {
  font-size: 0.9rem;
  line-height: 1.45;
  cursor: pointer;
  display: block;
}

.task-item.completed .task-label {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
  align-items: center;
}

.task-deadline {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
}

.deadline-firm {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.deadline-suggested {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.deadline-flexible {
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

.task-note {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.task-delete {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 2px 4px;
  border-radius: 4px;
  flex-shrink: 0;
  line-height: 1;
}

.task-delete:hover { color: var(--color-danger); background: var(--color-danger-light); }

.task-delete:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }

/* ===== Add Task ===== */
.add-task {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.add-task-row {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.add-task-row .field-input { flex: 1; }

/* ===== Sidebar ===== */
.checklist-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 72px;
}

.sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.sidebar-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.sidebar-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-card li {
  font-size: 0.825rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}

.sidebar-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.sidebar-card p {
  font-size: 0.825rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

/* ===== Guide Section ===== */
.guide-section {
  padding: 48px 0;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
}

.guide-section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 24px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.guide-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.guide-block h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.guide-block p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Scenario Section ===== */
.scenario-section {
  padding: 48px 0 60px;
}

.scenario-section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 24px;
}

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

.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--color-accent);
}

.scenario-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.scenario-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 32px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-note {
  font-size: 0.8rem;
  max-width: 500px;
  line-height: 1.5;
}

.footer-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  color: rgba(255,255,255,0.7);
  font-size: 0.825rem;
  text-decoration: none;
}

.footer-nav a:hover { color: #fff; text-decoration: underline; }

.footer-copy {
  font-size: 0.78rem;
  opacity: 0.5;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .checklist-layout {
    grid-template-columns: 1fr;
  }
  .checklist-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .hero-section { padding: 32px 0 28px; }
  .hero-content h1 { font-size: 1.5rem; }
  .hero-sub { font-size: 0.925rem; }
  .setup-card { padding: 20px; }
  .setup-grid { grid-template-columns: 1fr; }
  .checklist-sidebar { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
  .checklist-actions { gap: 6px; }
  .btn { padding: 8px 14px; font-size: 0.85rem; }
  .main-nav { gap: 12px; }
  .main-nav a { font-size: 0.8rem; }
}

@media print {
  .site-header, .site-footer, .setup-section, .checklist-actions, .add-task, .checklist-sidebar, .guide-section, .scenario-section, .hero-section { display: none; }
  .checklist-section { display: block; padding: 0; }
  .task-group { break-inside: avoid; }
  body { background: #fff; color: #000; }
}

/* ===== Focus styles for accessibility ===== */
*:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-muted);
}

.empty-state p { font-size: 0.9rem; }



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}