/* ═══════════════════════════════════════════
   FITQUEST — GLOBAL STYLES
   ─────────────────────────────────────────
   Design tokens, base, layout, and all
   component styles for the FitQuest PWA.
═══════════════════════════════════════════ */

/* ── 1. CSS VARIABLES / DESIGN TOKENS ── */
:root {
  /* Colors */
  --color-primary:       #4CAF50;
  --color-primary-dark:  #388E3C;
  --color-primary-light: #C8E6C9;
  --color-accent:        #FFC107;
  --color-accent-dark:   #F57F17;
  --color-danger:        #E53935;
  --color-bg:            #FAFAFA;
  --color-surface:       #FFFFFF;
  --color-border:        #E0E0E0;
  --color-text:          #1E1E1E;
  --color-text-muted:    #757575;
  --color-nav-bg:        #FFFFFF;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;

  /* Radius */
  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.15);

  /* Typography */
  --font-base:   -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-med:  250ms ease;
  --transition-slow: 400ms ease;

  /* Nav */
  --nav-height: 68px;
}

/* ── DARK MODE ── */
body.dark-mode {
  --color-bg:          #0F0F0F;
  --color-surface:     #1A1A1A;
  --color-border:      #2C2C2C;
  --color-text:        #F0F0F0;
  --color-text-muted:  #9E9E9E;
  --color-nav-bg:      #1A1A1A;
}

/* ── 2. RESET & BASE ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden; /* prevent body scroll, content scrolls inside */
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: var(--font-size-md);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-med), color var(--transition-med);
}

/* ── 3. LAYOUT: APP SHELL ── */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* ── 4. HEADER ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  z-index: 10;
}

.header-logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.level-badge {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #000;
  font-weight: 800;
  font-size: var(--font-size-sm);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(255, 193, 7, 0.4);
}

/* ── 5. MAIN CONTENT ── */
.tab-content {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.tab-pane {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  overflow-y: auto;
  padding: var(--space-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-med), transform var(--transition-med);
}

.tab-pane.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ── 6. CARD ── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.page-title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

/* ── 7. XP BAR ── */
.xp-bar-container {
  padding: var(--space-md);
}

.xp-bar-labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.xp-level-text {
  font-weight: 800;
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  text-shadow: 0 0 12px rgba(255,193,7,0.3);
}

.xp-count-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

.xp-bar-track {
  width: 100%;
  height: 12px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), #FF9800);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  box-shadow: 0 0 10px rgba(255,193,7,0.5);
}

/* ── 8. STREAK CARD ── */
.streak-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: linear-gradient(135deg, #1B5E20, #2E7D32);
  border: none;
  color: #fff;
  overflow: hidden;
  position: relative;
}

.streak-card::before {
  content: '';
  position: absolute;
  top: -20px; right: -20px;
  width: 100px; height: 100px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.streak-fire {
  font-size: 3rem;
  animation: flicker 1.5s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes flicker {
  0%, 100% { transform: scale(1) rotate(-2deg); }
  50%       { transform: scale(1.1) rotate(2deg); }
}

.streak-info { flex: 1; }

.streak-count {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
}

.streak-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  opacity: 0.8;
}

.streak-best {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}
.streak-best-label {
  font-size: var(--font-size-xs);
  opacity: 0.7;
  text-transform: uppercase;
}
.streak-best-value {
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--color-accent);
}

/* ── 9. QUEST BUTTON ── */
.btn-quest {
  width: 100%;
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  font-size: var(--font-size-lg);
  font-weight: 800;
  letter-spacing: 0.05em;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-quest::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.15), transparent);
  pointer-events: none;
}

.btn-quest:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(76, 175, 80, 0.5);
}

.btn-quest:active {
  transform: translateY(1px);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.btn-quest-icon { font-size: 1.3em; }

/* ── 10. WEEK MINI GRID ── */
.week-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-xs);
  text-align: center;
}

.week-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.week-day-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.week-day-dot {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: background var(--transition-med), transform var(--transition-fast);
}

.week-day-dot.done {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  box-shadow: 0 3px 10px rgba(76, 175, 80, 0.4);
  transform: scale(1.05);
}

.week-day-dot.today {
  ring: 2px solid var(--color-primary);
  border: 2px solid var(--color-primary);
}

/* ── 11. BOTTOM NAVIGATION ── */
.bottom-nav {
  display: flex;
  background: var(--color-nav-bg);
  border-top: 1px solid var(--color-border);
  height: var(--nav-height);
  flex-shrink: 0;
}

.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: var(--space-xs);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-btn::before {
  content: '';
  position: absolute;
  top: 0; left: 20%; right: 20%;
  height: 3px;
  background: var(--color-primary);
  border-radius: 0 0 var(--radius-full) var(--radius-full);
  transform: scaleX(0);
  transition: transform var(--transition-med);
}

.nav-btn.active {
  color: var(--color-primary);
}

.nav-btn.active::before {
  transform: scaleX(1);
}

.nav-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.nav-label {
  font-size: 10px;
  font-weight: 600;
}

/* ── 12. CALENDAR ── */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.cal-month-title {
  font-size: var(--font-size-lg);
  font-weight: 800;
}

.cal-nav-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--color-text);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.cal-nav-btn:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.05);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  padding: var(--space-md);
  text-align: center;
}

.cal-day-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-text-muted);
  padding-bottom: var(--space-sm);
  text-transform: uppercase;
}

.cal-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.cal-day.empty { opacity: 0; }

.cal-day.today {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-weight: 800;
}

.cal-day.done {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: 0 3px 8px rgba(76, 175, 80, 0.35);
}

.streak-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.streak-summary-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.ss-icon { font-size: 1.8rem; }

.ss-value {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--color-primary);
}

.ss-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: 600;
}

/* ── 13. AI CHAT ── */
.chat-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  padding: var(--space-md);
  gap: var(--space-sm);
}

#tab-ai { padding: 0; }

.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
  margin: var(--space-md);
  margin-bottom: 0;
}

.chat-header h3 {
  font-size: var(--font-size-md);
  font-weight: 700;
}

.chat-header > span { font-size: 2rem; }

.chat-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
}

.chat-bubble {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  animation: bubbleIn var(--transition-med) ease;
}

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chat-bubble.ai {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
  align-self: flex-start;
  color: var(--color-text);
}

.chat-bubble.user {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-bottom-right-radius: var(--radius-sm);
  align-self: flex-end;
}

.chat-bubble.loading {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 14px;
}

.chat-bubble.loading .dot {
  width: 7px; height: 7px;
  background: var(--color-text-muted);
  border-radius: 50%;
  animation: bounce 1.2s infinite;
}
.chat-bubble.loading .dot:nth-child(2) { animation-delay: 0.2s; }
.chat-bubble.loading .dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40%           { transform: translateY(-8px); }
}

.quick-chips {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding: 0 var(--space-md);
  flex-shrink: 0;
  scrollbar-width: none;
}
.quick-chips::-webkit-scrollbar { display: none; }

.chip {
  white-space: nowrap;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}
.chip:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.04);
}

.chat-input-area {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md) var(--space-md);
  flex-shrink: 0;
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}
.chat-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.chat-send-btn {
  width: 44px; height: 44px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.chat-send-btn:hover { background: var(--color-primary-dark); transform: scale(1.05); }
.chat-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── 14. STATISTICS ── */
.stats-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.stats-card {
  text-align: center;
  padding: var(--space-md) var(--space-sm);
}

.stats-icon { font-size: 1.5rem; }

.stats-value {
  font-size: var(--font-size-xl);
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1.1;
  margin: 4px 0;
}

.stats-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.chart-container {
  padding: var(--space-md);
}

/* ── 15. SETTINGS ── */
.setting-section {
  margin-bottom: var(--space-md);
}

.setting-section-title {
  font-size: var(--font-size-md);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.setting-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.setting-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-md);
  background: var(--color-bg);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  transition: border-color var(--transition-fast);
}
.setting-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.btn-setting-save {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-md);
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.btn-setting-save:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

.api-key-status {
  display: block;
  font-size: var(--font-size-sm);
  margin-top: var(--space-sm);
  color: var(--color-primary);
  font-weight: 600;
  min-height: 20px;
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 28px;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-med);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 22px; width: 22px;
  left: 3px; bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition-med);
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.toggle-switch input:checked + .toggle-slider { background: var(--color-primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(24px); }

.data-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.btn-data {
  padding: 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.btn-data:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.about-card {
  text-align: center;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ── 16. MODAL ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-sm);
  transition: opacity var(--transition-med);
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-md) var(--radius-md);
  width: 100%;
  max-width: 480px;
  max-height: 92vh;
  overflow-y: auto;
  padding: var(--space-lg);
  transform: translateY(0);
  animation: slideUp var(--transition-med) ease;
}

@keyframes slideUp {
  from { transform: translateY(100px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 800;
}

.modal-close {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-text);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition-fast);
}
.modal-close:hover { background: var(--color-border); }

.modal-form { display: flex; flex-direction: column; gap: var(--space-md); }

.form-group { display: flex; flex-direction: column; gap: var(--space-xs); }

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
}

.form-input {
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  font-family: var(--font-base);
}
.form-input:focus { outline: none; border-color: var(--color-primary); }

.form-textarea {
  height: 90px;
  resize: none;
}

.mood-selector {
  display: flex;
  gap: var(--space-sm);
}

.mood-btn {
  flex: 1;
  padding: var(--space-sm);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}
.mood-btn.active {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-modal-submit {
  margin-top: var(--space-sm);
  padding: var(--space-md);
  font-size: var(--font-size-md);
}

/* ── 17. TOAST ── */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1E1E1E;
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  max-width: 90%;
  text-align: center;
  opacity: 0;
  transition: opacity var(--transition-med), transform var(--transition-med);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.hidden { display: none; }

/* ── 18. UTILITY ── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }

/* ── 19. RESPONSIVE: DESKTOP ── */
@media (min-width: 768px) {
  .app-shell {
    max-width: 900px;
    flex-direction: row;
  }

  .app-header {
    display: none;
  }

  .bottom-nav {
    flex-direction: column;
    width: 200px;
    height: 100%;
    border-top: none;
    border-right: 1px solid var(--color-border);
    padding-top: var(--space-xl);
    gap: var(--space-xs);
    justify-content: flex-start;
  }

  .nav-btn {
    flex-direction: row;
    justify-content: flex-start;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    gap: var(--space-md);
    margin: 2px 8px;
  }

  .nav-btn::before {
    top: 0; left: 0; right: auto; bottom: 0;
    width: 3px; height: auto;
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
  }

  .nav-icon { font-size: 1.1rem; }
  .nav-label { font-size: var(--font-size-sm); }

  .tab-content { flex: 1; }

  .page-title { font-size: var(--font-size-xl); }

  .tab-pane { padding: var(--space-xl); }
}