/* ═══════════════════════════════════════════════════════════
   base.css  —  Design tokens + shared component styles
   All pages inherit these via base.html
   ═══════════════════════════════════════════════════════════ */

/* ── Design tokens (CSS custom properties) ─────────────────── */
:root {
  /* Colour palette — Warm Paper */
  --bg:       #f5f0e8;
  --panel:    #ede8dc;
  --border:   #c8bfa8;
  --accent:   #b85c00;
  --danger:   #c0392b;
  --text:     #2a1f0e;
  --dim:      #5a4a32;
  --success:  #2e7d4f;
  --error:    #c0392b;

  /* Typography */
  --font-mono:    'Space Mono', monospace;
  --font-display: 'Bebas Neue', sans-serif;

  /* Spacing */
  --gap:    1.2rem;
  --pad:    2rem;
  --radius: 0;
}

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

/* ── Base page ──────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grid overlay — inherited by every page */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(184,92,0,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,92,0,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── Navigation header ──────────────────────────────────────── */
.site-header {
  position: relative;
  z-index: 1;
  padding: 2rem var(--pad) 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-header__brand {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.site-header__title {
  font-family: var(--font-display);
  font-size: 3rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  line-height: 1;
}

.site-header__sub {
  font-size: 0.85rem;
  color: var(--text);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* ── Nav links ──────────────────────────────────────────────── */
.nav {
  display: flex;
  gap: 0.4rem;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text);
  border: 1px solid transparent;
  padding: 0.5rem 0.9rem;
  transition: color 0.15s, border-color 0.15s;
}

.nav__link:hover    { color: var(--accent); border-color: var(--border); }
.nav__link--active  { color: var(--accent); border-color: var(--accent); }

/* ── Page wrapper ───────────────────────────────────────────── */
.page {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 3rem auto;
  padding: 0 var(--pad);
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* ── Section title ──────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.section-header__num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--accent);
  line-height: 1;
}

.section-header__label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
  line-height: 1.5;
}

/* ── Buttons ────────────────────────────────────────────────── */
/* Base button — all variants inherit from this */
.btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.85rem 1.2rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  width: 100%;
}

.btn:hover   { background: var(--accent); color: var(--bg); }
.btn:active  { transform: translateY(1px); }
.btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* Danger variant — inherits .btn, overrides colour tokens */
.btn--danger {
  border-color: var(--danger);
  color: var(--danger);
}
.btn--danger:hover { background: var(--danger); color: #fff; }

/* ── Result box ─────────────────────────────────────────────── */
.result-box {
  border: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  transition: border-color 0.3s, background 0.3s;
}

.result-box--show    { border-color: var(--accent);  background: rgba(232,255,71,0.03); }
.result-box--correct { border-color: var(--success); background: rgba(71,255,178,0.04); }
.result-box--wrong   { border-color: var(--error);   background: rgba(255,71,71,0.04);  }

.result-box__label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.result-box__num {
  font-family: var(--font-display);
  font-size: 5rem;
  line-height: 1;
  color: var(--accent);
  transition: color 0.3s;
}

.result-box__num--correct { color: var(--success); }
.result-box__num--wrong   { color: var(--error); }

.result-box__sub {
  font-size: 0.75rem;
  color: var(--text);
  margin-top: 0.4rem;
  letter-spacing: 0.1em;
}

/* ── Status line ────────────────────────────────────────────── */
.status {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-align: center;
  min-height: 1em;
  color: var(--text);
}

.status--ok  { color: var(--success); }
.status--err { color: var(--error); }

/* ── Spinner ────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 10px; height: 10px;
  border: 1px solid var(--dim);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

/* ── Animations ─────────────────────────────────────────────── */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes flash {
  0%   { opacity: 0.2; transform: scale(0.85); }
  60%  { opacity: 1;   transform: scale(1.05); }
  100% { opacity: 1;   transform: scale(1); }
}

.flash { animation: flash 0.4s ease-out; }

/* ── Upload page specifics ──────────────────────────────────── */
.drop-zone {
  border: 1px dashed var(--border);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text);
}

.drop-zone:hover,
.drop-zone--drag { border-color: var(--accent); color: var(--accent); background: rgba(232,255,71,0.03); }

.drop-zone input { display: none; }

.preview-img {
  width: 100%;
  max-width: 200px;
  height: 200px;
  object-fit: contain;
  display: none;
  margin: 0 auto;
  image-rendering: pixelated;
  border: 1px solid var(--border);
  background: #000;
}

/* ── Random page specifics ──────────────────────────────────── */
.mnist-display {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  border: 1px solid var(--border);
  min-height: 200px;
}

.mnist-display img {
  width: 180px;
  height: 180px;
  image-rendering: pixelated;
  object-fit: contain;
}

.mnist-display__placeholder {
  font-size: 0.75rem;
  color: var(--text);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.badge-row {
  display: flex;
  gap: 0.6rem;
}

.badge {
  flex: 1;
  border: 1px solid var(--border);
  padding: 0.8rem;
  text-align: center;
}

.badge__label { font-size: 0.7rem; color: var(--text); letter-spacing: 0.2em; text-transform: uppercase; }
.badge__val   { font-family: var(--font-display); font-size: 2rem; color: var(--text); line-height: 1.2; }

/* ── Draw page specifics ────────────────────────────────────── */
.draw-canvas {
  display: block;
  width: 100%;
  height: 280px;
  cursor: crosshair;
  background: #000;
  border: 1px solid var(--border);
  touch-action: none;
}

.canvas-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.brush-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.75rem;
  color: var(--text);
  letter-spacing: 0.15em;
}

.brush-row input[type=range] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  .site-header { padding: 1.2rem; }
  .page        { padding: 0 1.2rem; margin: 1.5rem auto; }
}

/* ── Badge verdict (correct / wrong indicator) ──────────────────────────────── */
.badge__verdict {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  margin-top: 0.3rem;
}

.badge__verdict--correct { color: var(--success); }
.badge__verdict--wrong   { color: var(--error); }

.badge__val--correct { color: var(--success); }
.badge__val--wrong   { color: var(--error); }