/* base.css — CSS tokens, reset, typography, safe-area handling, bottom nav */

/* ============================================================
   TOKENS
   ============================================================ */
:root {
  /* Background layers */
  --bg-base:        #0A0A0D;
  --bg-surface:     #101015;
  --bg-elevated:    #16161D;
  --bg-subtle:      #1C1C26;

  /* Primary accent — acid lime */
  --accent-primary: #A3FF12;
  --accent-dim:     #7FCC0E;
  --accent-glow:    rgba(163, 255, 18, 0.22);

  /* XP / reward — fire orange */
  --xp-color:       #FF6B35;
  --xp-glow:        rgba(255, 107, 53, 0.25);

  /* Freeze — ice blue */
  --freeze-color:   #88CCFF;
  --freeze-glow:    rgba(136, 204, 255, 0.2);

  /* Achievement rarity palette */
  --rarity-common:         var(--accent-primary);
  --rarity-common-glow:    var(--accent-glow);
  --rarity-rare:           var(--xp-color);
  --rarity-rare-glow:      var(--xp-glow);
  --rarity-legendary:      #B57BFF;
  --rarity-legendary-glow: rgba(181, 123, 255, 0.28);
  --rarity-legendary-alt:  #FFD166;

  /* Text on accent backgrounds (FAB, primary buttons, habit-toggle on) */
  --text-on-accent: #0A0A0D;

  /* Semantic */
  --priority-high:  #FF3B3B;
  --priority-med:   #FFB830;
  --priority-low:   #4ECDC4;
  --streak-fire:    #FF6B35;
  --success:        #A3FF12;
  --danger:         #FF3B3B;

  /* Text */
  --text-primary:   #F0F0F5;
  --text-secondary: #8A8A9E;
  --text-muted:     #44445A;

  /* Borders */
  --border-subtle:  rgba(255, 255, 255, 0.06);
  --border-active:  rgba(163, 255, 18, 0.45);

  /* Layout */
  --radius-card:    16px;
  --radius-inner:   12px;
  --radius-badge:   8px;
  --nav-height:     64px;
  --fab-size:       56px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-med:  300ms ease;
  --transition-slow: 600ms ease-out;

  /* Level reward avatar palettes */
  --avatar-indigo-from:  #4C1D95;
  --avatar-indigo-to:    #7C3AED;
  --avatar-crimson-from: #7F1D1D;
  --avatar-crimson-to:   #EA580C;
  --avatar-purple-from:  #581C87;
  --avatar-purple-to:    #EC4899;
  --avatar-rainbow-from: #EC4899;
  --avatar-rainbow-to:   #06B6D4;
}

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

html {
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
}

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea {
  font-family: inherit;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

.text-muted   { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent  { color: var(--accent-primary); }
.text-xp      { color: var(--xp-color); }
.text-danger  { color: var(--danger); }

/* ============================================================
   LAYOUT HELPERS
   ============================================================ */
.page-content {
  padding: 0 16px;
  padding-top: 16px;
  padding-bottom: calc(var(--nav-height) + env(safe-area-inset-bottom) + 16px);
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
  max-width: 480px;
  margin: 0 auto;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-top: env(safe-area-inset-top);
}

.page-title {
  font-family: 'Syne', sans-serif;
  font-size: 24px;
  font-weight: 800;
}

/* ============================================================
   BOTTOM NAV
   ============================================================ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-height) + env(safe-area-inset-bottom));
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-start;
  justify-content: space-around;
  z-index: 1000;
  padding-top: 8px;
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--text-muted);
  min-width: 48px;
  min-height: 48px;
  justify-content: center;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.nav-item svg {
  width: 22px;
  height: 22px;
  transition: transform var(--transition-fast);
}

.nav-item span {
  font-size: 11px;
  font-weight: 500;
  font-family: 'DM Sans', sans-serif;
}

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

.nav-item:active svg {
  transform: scale(1.15);
}

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed;
  bottom: calc(var(--nav-height) + env(safe-area-inset-bottom) + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 10px 18px;
  border-radius: var(--radius-inner);
  font-size: 14px;
  font-weight: 500;
  z-index: 2000;
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  pointer-events: none;
  white-space: nowrap;
  max-width: calc(100vw - 32px);
  text-overflow: ellipsis;
  overflow: hidden;
}

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

.toast--error {
  border-color: var(--danger);
  color: var(--danger);
}

.toast--success {
  border-color: var(--accent-primary);
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar {
  width: 3px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 2px;
}