/* ============================================================
   WordForge — Base Design System
   Tokens, resets, typography, utilities
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,600;0,700;1,600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Custom Properties ─────────────────────────────────── */
:root {
  /* Brand palette */
  --clr-bg-base:      #0d0f14;
  --clr-bg-surface:   #13161e;
  --clr-bg-elevated:  #1a1e2a;
  --clr-bg-overlay:   #22273a;

  --clr-border:       #2a2f42;
  --clr-border-soft:  #1e2333;

  /* Accent — electric violet → cobalt */
  --clr-accent-1:     #7c3aed;
  --clr-accent-2:     #4f46e5;
  --clr-accent-glow:  rgba(124, 58, 237, 0.25);

  /* Semantic */
  --clr-success:      #10b981;
  --clr-success-glow: rgba(16, 185, 129, 0.2);
  --clr-error:        #ef4444;
  --clr-error-glow:   rgba(239, 68, 68, 0.2);
  --clr-warning:      #f59e0b;
  --clr-info:         #3b82f6;

  /* Text */
  --clr-text-primary:   #f1f5f9;
  --clr-text-secondary: #94a3b8;
  --clr-text-muted:     #475569;
  --clr-text-inverse:   #0d0f14;

  /* XP / level */
  --clr-xp:         #f59e0b;
  --clr-xp-glow:    rgba(245, 158, 11, 0.25);

  /* Typography */
  --font-sans:  'Inter', system-ui, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

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

  /* Radius */
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.6);
  --shadow-accent: 0 0 32px var(--clr-accent-glow);

  /* Transitions */
  --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Sidebar */
  --sidebar-width: 240px;
  --header-height: 0px;
}

/* Light theme */
[data-theme="light"] {
  --clr-bg-base:      #f8fafc;
  --clr-bg-surface:   #ffffff;
  --clr-bg-elevated:  #f1f5f9;
  --clr-bg-overlay:   #e2e8f0;
  --clr-border:       #cbd5e1;
  --clr-border-soft:  #e2e8f0;
  --clr-text-primary:   #0f172a;
  --clr-text-secondary: #475569;
  --clr-text-muted:     #94a3b8;
  --clr-text-inverse:   #f8fafc;
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
}

/* Neon theme */
[data-theme="neon"] {
  --clr-bg-base:      #000510;
  --clr-bg-surface:   #010b1a;
  --clr-bg-elevated:  #011022;
  --clr-accent-1:     #00f5ff;
  --clr-accent-2:     #0070ff;
  --clr-accent-glow:  rgba(0, 245, 255, 0.2);
  --clr-success:      #39ff14;
  --clr-border:       #00f5ff33;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--clr-bg-base);
  color: var(--clr-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--clr-accent-1);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--clr-accent-2); }

img, video { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
input, textarea { font-family: inherit; }

/* ── Typography Scale ──────────────────────────────────────── */
.display-xl {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.display-lg {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
}
.heading-lg  { font-size: 1.5rem;   font-weight: 600; line-height: 1.3; }
.heading-md  { font-size: 1.25rem;  font-weight: 600; line-height: 1.3; }
.heading-sm  { font-size: 1rem;     font-weight: 600; line-height: 1.4; }
.body-lg     { font-size: 1.0625rem; font-weight: 400; line-height: 1.6; }
.body-md     { font-size: 0.9375rem; font-weight: 400; line-height: 1.6; }
.body-sm     { font-size: 0.8125rem; font-weight: 400; line-height: 1.5; }
.label       { font-size: 0.75rem;  font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; }
.mono        { font-family: var(--font-mono); font-size: 0.9rem; }

/* ── Gradient Text ─────────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, var(--clr-accent-1), #a78bfa, var(--clr-accent-2));
  -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(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 500;
  border: none;
  transition: all var(--transition-normal);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
}
.btn:hover:not(:disabled)::after { background: rgba(255,255,255,0.07); }
.btn:active:not(:disabled)       { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--clr-accent-1), var(--clr-accent-2));
  color: #fff;
  box-shadow: 0 4px 20px var(--clr-accent-glow);
}
.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 28px var(--clr-accent-glow), 0 0 0 1px rgba(124,58,237,0.4);
}

.btn-secondary {
  background: var(--clr-bg-elevated);
  color: var(--clr-text-primary);
  border: 1px solid var(--clr-border);
}
.btn-ghost {
  background: transparent;
  color: var(--clr-text-secondary);
  border: 1px solid transparent;
}
.btn-ghost:hover:not(:disabled) {
  background: var(--clr-bg-elevated);
  color: var(--clr-text-primary);
  border-color: var(--clr-border);
}

.btn-success {
  background: linear-gradient(135deg, #059669, var(--clr-success));
  color: #fff;
  box-shadow: 0 4px 16px var(--clr-success-glow);
}
.btn-danger {
  background: linear-gradient(135deg, #dc2626, var(--clr-error));
  color: #fff;
  box-shadow: 0 4px 16px var(--clr-error-glow);
}

.btn-lg { padding: var(--sp-4) var(--sp-8); font-size: 1.0625rem; border-radius: var(--radius-lg); }
.btn-sm { padding: var(--sp-2) var(--sp-3); font-size: 0.8125rem; border-radius: var(--radius-sm); }
.btn-full { width: 100%; }
.btn-icon { padding: var(--sp-3); border-radius: var(--radius-md); }

/* ── Form Elements ─────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.form-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  letter-spacing: 0.02em;
}
.form-input {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  background: var(--clr-bg-elevated);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text-primary);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  outline: none;
}
.form-input:focus {
  border-color: var(--clr-accent-1);
  box-shadow: 0 0 0 3px var(--clr-accent-glow);
  background: var(--clr-bg-base);
}
.form-input::placeholder { color: var(--clr-text-muted); }
.form-input.error {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px var(--clr-error-glow);
}
.form-error {
  font-size: 0.8125rem;
  color: var(--clr-error);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--clr-bg-surface);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
}
.card-elevated {
  background: var(--clr-bg-elevated);
  box-shadow: var(--shadow-md);
}
.card-glass {
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.08);
}

/* ── Badge / Chip ──────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 2px var(--sp-2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}
.badge-accent  { background: var(--clr-accent-glow); color: #a78bfa; }
.badge-success { background: var(--clr-success-glow); color: var(--clr-success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--clr-warning); }
.badge-error   { background: var(--clr-error-glow); color: var(--clr-error); }

/* ── Progress Bar ──────────────────────────────────────────── */
.progress-bar {
  height: 6px;
  background: var(--clr-bg-overlay);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--clr-accent-1), var(--clr-accent-2));
  transition: width var(--transition-slow);
  position: relative;
}
.progress-bar__fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
  animation: shimmer 2s infinite;
}

/* ── Divider ───────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--clr-border-soft);
  margin: var(--sp-6) 0;
}
.divider-text {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--clr-text-muted);
  font-size: 0.8125rem;
}
.divider-text::before,
.divider-text::after {
  content: '';
  flex: 1;
  border-top: 1px solid var(--clr-border-soft);
}

/* ── Toast ─────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--sp-6);
  right: var(--sp-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  pointer-events: none;
}
.toast {
  background: var(--clr-bg-elevated);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--sp-3) var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  animation: toastIn var(--transition-normal) forwards;
  max-width: 380px;
}
.toast.success { border-color: var(--clr-success); color: var(--clr-success); }
.toast.error   { border-color: var(--clr-error);   color: var(--clr-error); }
.toast.info    { border-color: var(--clr-accent-1); color: #a78bfa; }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--clr-border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--clr-text-muted); }

/* ── Utility ───────────────────────────────────────────────── */
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.text-center  { text-align: center; }
.text-muted   { color: var(--clr-text-secondary); }
.text-accent  { color: var(--clr-accent-1); }
.text-success { color: var(--clr-success); }
.text-error   { color: var(--clr-error); }
.text-warning { color: var(--clr-warning); }
.flex         { display: flex; }
.flex-col     { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2        { gap: var(--sp-2); }
.gap-3        { gap: var(--sp-3); }
.gap-4        { gap: var(--sp-4); }
.w-full       { width: 100%; }
.mt-2         { margin-top: var(--sp-2); }
.mt-4         { margin-top: var(--sp-4); }
.mt-6         { margin-top: var(--sp-6); }
.mb-4         { margin-bottom: var(--sp-4); }