/* Blueprint Generator — styles.css
 * Initiative: INITIATIVE-012C
 * Design system: Nexus / Inter + JetBrains Mono
 */

:root, [data-theme="light"] {
  --color-bg: #f7f6f2;
  --color-surface: #f9f8f5;
  --color-surface-2: #fbfbf9;
  --color-surface-offset: #f0ede8;
  --color-border: #d4d1ca;
  --color-divider: #dcd9d5;
  --color-text: #28251d;
  --color-text-muted: #7a7974;
  --color-text-faint: #bab9b4;
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;
  --color-primary-highlight: #cedcd8;
  --color-accent: #da7101;
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.09);
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --transition: 160ms cubic-bezier(0.16, 1, 0.3, 1);
  --header-h: 52px;
}

[data-theme="dark"] {
  --color-bg: #171614;
  --color-surface: #1c1b19;
  --color-surface-2: #201f1d;
  --color-surface-offset: #242320;
  --color-border: #393836;
  --color-divider: #262523;
  --color-text: #cdccca;
  --color-text-muted: #797876;
  --color-text-faint: #5a5957;
  --color-primary: #4f98a3;
  --color-primary-hover: #227f8b;
  --color-primary-highlight: #313b3b;
  --color-accent: #fdab43;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
}
button { cursor: pointer; font: inherit; border: none; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
input { font: inherit; color: inherit; background: none; border: none; outline: none; }
.hidden { display: none !important; }

/* HEADER */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center; gap: 1.5rem;
  padding: 0 1.25rem;
  background: color-mix(in oklab, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}
.site-logo {
  display: flex; align-items: center; gap: 0.5rem;
  font-weight: 600; font-size: 0.9375rem;
  color: var(--color-text);
  flex-shrink: 0;
}
.site-logo svg { width: 24px; height: 24px; flex-shrink: 0; }
.site-nav { display: flex; gap: 0.25rem; margin-left: auto; }
.nav-link {
  font-size: 0.875rem; font-weight: 500;
  padding: 0.3rem 0.75rem; border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav-link.active { color: var(--color-primary); background: var(--color-primary-highlight); }
.theme-btn {
  width: 34px; height: 34px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted); flex-shrink: 0;
  transition: color var(--transition), background var(--transition);
}
.theme-btn:hover { color: var(--color-text); background: var(--color-surface-offset); }

/* HERO */
.hero {
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding: 2.5rem 1.25rem 2rem;
}
.hero-inner { max-width: 700px; margin: 0 auto; }
.hero-badge {
  display: inline-flex; align-items: center;
  font-size: 0.75rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  color: var(--color-primary); background: var(--color-primary-highlight);
  padding: 0.25rem 0.65rem; border-radius: var(--radius-full, 9999px);
  margin-bottom: 0.75rem;
}
.hero-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -.02em; color: var(--color-text);
  margin-bottom: 0.75rem;
}
.hero-sub {
  font-size: 0.9375rem; color: var(--color-text-muted);
  max-width: 62ch; margin-bottom: 1.25rem;
}
.example-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem;
}
.example-label {
  font-size: 0.8125rem; font-weight: 500;
  color: var(--color-text-faint);
}
.example-btn {
  font-size: 0.8125rem; font-weight: 500;
  padding: 0.3rem 0.75rem; border-radius: var(--radius-full, 9999px);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.example-btn:hover {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.example-btn.secondary {
  background: var(--color-surface-offset);
}

/* APP LAYOUT */
.app-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100dvh - var(--header-h) - 140px);
}
@media (max-width: 900px) {
  .app-layout { grid-template-columns: 1fr; }
}

/* GOALS PANEL */
.goals-panel {
  border-right: 1px solid var(--color-divider);
  display: flex; flex-direction: column;
  position: sticky; top: var(--header-h);
  height: calc(100dvh - var(--header-h));
  overflow: hidden;
}
@media (max-width: 900px) {
  .goals-panel {
    position: static; height: auto;
    border-right: none; border-bottom: 1px solid var(--color-divider);
  }
}
.panel-header {
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  flex-shrink: 0;
}
.search-wrap {
  display: flex; align-items: center; gap: 0.5rem;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.45rem 0.65rem;
}
.search-icon { color: var(--color-text-faint); flex-shrink: 0; }
.search-wrap input {
  flex: 1; font-size: 0.875rem;
  color: var(--color-text);
}
.search-wrap input::placeholder { color: var(--color-text-faint); }
.goal-list {
  overflow-y: auto; flex: 1;
  padding: 0.375rem;
}
.goal-item {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
  border: 1px solid transparent;
}
.goal-item:hover { background: var(--color-surface-offset); }
.goal-item.active {
  background: var(--color-primary-highlight);
  border-color: oklch(from var(--color-primary) l c h / 0.25);
}
.goal-title {
  font-size: 0.875rem; font-weight: 500;
  color: var(--color-text); line-height: 1.3;
}
.goal-item.active .goal-title { color: var(--color-primary); }
.goal-cats {
  font-size: 0.75rem; color: var(--color-text-faint);
  margin-top: 0.125rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* BLUEPRINT PANEL */
.blueprint-panel {
  padding: 1.5rem;
  min-height: 600px;
}

/* EMPTY STATE */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 0.75rem;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
}
.empty-state svg { color: var(--color-text-faint); margin-bottom: 0.5rem; }
.empty-state h2 { font-size: 1.1rem; font-weight: 600; color: var(--color-text); }
.empty-state p { font-size: 0.875rem; max-width: 38ch; }
.empty-examples { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 0.5rem; }

/* BLUEPRINT CARD */
.blueprint-card {
  max-width: 860px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.bp-topbar {
  display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}
.bp-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; flex: 1; }
.meta-chip {
  display: inline-flex; align-items: center;
  font-size: 0.75rem; font-weight: 600;
  padding: 0.22rem 0.65rem;
  border-radius: var(--radius-full, 9999px);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.difficulty-beginner { background: #d4f0de; color: #1a7a3c; border-color: #a6dbb8; }
.difficulty-intermediate { background: #fff3cd; color: #8a5b00; border-color: #f5d97a; }
.difficulty-advanced { background: #fde8e8; color: #a12c2c; border-color: #f5b8b8; }
[data-theme="dark"] .difficulty-beginner { background: #1e3a28; color: #6daa45; border-color: #2e5c10; }
[data-theme="dark"] .difficulty-intermediate { background: #3a2e00; color: #e8af34; border-color: #6b5000; }
[data-theme="dark"] .difficulty-advanced { background: #3a1f1f; color: #dd6974; border-color: #6b2020; }
.meta-chip.neutral { background: var(--color-surface-offset); color: var(--color-text-muted); }

.bp-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }
.action-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.8125rem; font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.action-btn:hover { color: var(--color-text); background: var(--color-surface); box-shadow: var(--shadow-sm); }
.action-btn.accent {
  background: var(--color-primary-highlight);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  color: var(--color-primary);
}
.action-btn.accent:hover { background: var(--color-primary); color: #fff; }

.bp-body { padding: 1.5rem 1.5rem 2rem; display: flex; flex-direction: column; gap: 1.75rem; }
.bp-title { font-size: 1.4rem; font-weight: 700; letter-spacing: -.015em; line-height: 1.2; }
.bp-summary { font-size: 0.9375rem; color: var(--color-text-muted); max-width: 68ch; }

.section { display: flex; flex-direction: column; gap: 0.75rem; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; gap: 0.5rem; }
.section-title {
  font-size: 0.8125rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase;
  color: var(--color-text-faint);
}
.section-hint { font-size: 0.75rem; color: var(--color-text-faint); }

/* LEARNING PATH */
.learning-path {
  display: flex; flex-direction: column; gap: 0.5rem;
}
.lp-phase {
  display: flex; align-items: flex-start; gap: 0.75rem;
}
.phase-num {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-size: 0.75rem; font-weight: 700;
  margin-top: 0.125rem;
}
.phase-skills { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.phase-skill {
  font-size: 0.8125rem; font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

/* SKILL GRID */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: 0.6rem;
}
.skill-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  display: flex; flex-direction: column; gap: 0.2rem;
}
.skill-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.5rem; }
.skill-name { font-size: 0.875rem; font-weight: 600; line-height: 1.3; }
.skill-level {
  font-size: 0.6875rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  padding: 0.1rem 0.45rem; border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.level-basic { background: #d4f0de; color: #1a7a3c; }
.level-intermediate { background: #fff3cd; color: #8a5b00; }
.level-advanced { background: #fde8e8; color: #a12c2c; }
[data-theme="dark"] .level-basic { background: #1e3a28; color: #6daa45; }
[data-theme="dark"] .level-intermediate { background: #3a2e00; color: #e8af34; }
[data-theme="dark"] .level-advanced { background: #3a1f1f; color: #dd6974; }
.skill-cat { font-size: 0.75rem; color: var(--color-text-faint); font-family: var(--font-mono); }
.skill-reason { font-size: 0.75rem; color: var(--color-text-muted); }

/* CATEGORY CHIPS */
.cat-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.cat-chip {
  font-size: 0.8125rem; font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full, 9999px);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.2);
}

/* TOAST */
.toast {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 200;
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 0.875rem; font-weight: 500;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  pointer-events: none;
  animation: slideUp 0.2s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  .blueprint-panel { padding: 1rem; }
  .bp-body { padding: 1rem 1rem 1.5rem; }
  .bp-topbar { flex-direction: column; align-items: flex-start; }
  .bp-actions { width: 100%; }
}