/* ═══════════════════════════════════════════════════════════════
   base.css — CSS variables, reset, typography, buttons
   WordlyCounter Brand Palette:
     Primary   #3B4CCA  Indigo Ink
     Secondary #1E8A8A  Slate Teal
     Accent    #A8FF3E  Electric Lime
     BG        #F7F8FC  Soft White
     Surface   #FFFFFF
     Text      #1A1D2E  Graphite
     Muted     #6B7280  Cool Gray
     Error     #FF4D4F  Coral Red
═══════════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties ──────────────────────────────────── */
:root {
  /* Colors */
  --color-primary:        #3B4CCA;
  --color-primary-dark:   #2d3ba0;
  --color-primary-light:  #eef0fb;
  --color-primary-glow:   rgba(59, 76, 202, 0.15);
  --color-secondary:      #1E8A8A;
  --color-secondary-light:#e6f4f4;
  --color-accent:         #A8FF3E;
  --color-accent-dark:    #7acc1e;
  --color-bg:             #F7F8FC;
  --color-surface:        #FFFFFF;
  --color-surface-raised: #FFFFFF;
  --color-text:           #1A1D2E;
  --color-muted:          #6B7280;
  --color-border:         #E5E7EB;
  --color-border-light:   #F3F4F6;
  --color-error:          #FF4D4F;
  --color-warning:        #F59E0B;
  --color-success:        #22C55E;

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body:    'Inter', ui-sans-serif, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* Spacing scale */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-2xl: 32px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.16);

  /* Transitions */
  --transition-fast:   0.12s ease;
  --transition:        0.18s ease;
  --transition-slow:   0.3s ease;

  /* Layout */
  --header-h:          60px;
  --container-max:     1280px;
  --container-padding: clamp(16px, 4vw, 48px);
}

/* ── Dark Theme ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --color-bg:             #0D0F18;
  --color-surface:        #161929;
  --color-surface-raised: #1E2235;
  --color-text:           #E8EAF6;
  --color-muted:          #9CA3AF;
  --color-border:         #2A2D45;
  --color-border-light:   #1E2235;
  --color-primary-light:  #1a1f4a;
  --color-primary-glow:   rgba(59, 76, 202, 0.2);
  --color-secondary-light:#0d2929;
  --shadow-md: 0 4px 16px rgba(0,0,0,.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.4);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

main { flex: 1; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-dark); }

img, svg { display: block; max-width: 100%; }

/* ── Container ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--color-text);
}

.gradient-text {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
  user-select: none;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 8px var(--color-primary-glow);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--color-primary-glow);
}

.btn-secondary {
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  border-color: transparent;
}
.btn-secondary:hover {
  background: var(--color-secondary);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--color-border-light);
  color: var(--color-text);
}

.btn-sm  { padding: 7px 14px;  font-size: 0.8125rem; }
.btn-lg  { padding: 14px 28px; font-size: 1rem; }
.btn-xl  { padding: 16px 36px; font-size: 1.0625rem; border-radius: var(--radius-lg); }

/* ── Focus (Accessibility) ──────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}