/* ============================================================
   base.css — Shared across all pages
   Ahmed Academy 3D Model Platform
============================================================ */

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

:root {
  --bg:      #0a0c0f;
  --surface: #111418;
  --surface2:#161b22;
  --border:  #1e2328;
  --accent:  #00c9a7;
  --accent2: #00a88c;
  --text:    #c9d1d9;
  --heading: #f0f6fc;
  --danger:  #f85149;
  --radius:  8px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

/* ── Header ─────────────────────────────────────────────────── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 50;
}

/* ── Logo ───────────────────────────────────────────────────── */
.logo { display: flex; align-items: center; gap: .75rem; text-decoration: none; }
.logo-mark {
  width: 38px; height: 38px;
  background: var(--accent);
  border-radius: 7px;
  display: grid; place-items: center;
  font-weight: 800; font-size: 1rem;
  color: #0a0c0f;
  flex-shrink: 0;
}
.logo-text { color: var(--heading); font-weight: 700; font-size: 1.1rem; }
.logo-sub  { color: var(--accent); font-size: .68rem; letter-spacing: .09em; display: block; }

/* ── Badge ──────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: .22rem .65rem;
  border-radius: 20px;
  font-size: .72rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

/* ── Alerts ─────────────────────────────────────────────────── */
.alert {
  padding: .8rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  font-size: .9rem;
}
.alert-error   { background: rgba(248,81,73,.12); border: 1px solid rgba(248,81,73,.4); color: #f85149; }
.alert-success { background: rgba(0,201,167,.1);  border: 1px solid rgba(0,201,167,.35); color: var(--accent); }

/* ── Three.js viewer shared ─────────────────────────────────── */
#viewerCanvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

#loaderOverlay {
  position: absolute; inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 5;
}
#loaderOverlay.hidden { display: none; }

.spinner {
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.load-text { color: #8b949e; font-size: .83rem; }

/* ── Viewer control buttons ─────────────────────────────────── */
.ctrl-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .35rem .75rem;
  border-radius: 7px;
  font-size: .78rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .4rem;
  transition: border-color .2s, color .2s, background .2s;
  white-space: nowrap;
}
.ctrl-btn:hover  { border-color: var(--accent); color: var(--accent); }
.ctrl-btn.active { background: rgba(0,201,167,.12); border-color: var(--accent); color: var(--accent); }

/* ── Back / nav links ───────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: #656d76;
  font-size: .85rem;
  text-decoration: none;
  border: 1px solid var(--border);
  padding: .38rem .9rem;
  border-radius: var(--radius);
  transition: color .2s, border-color .2s;
}
.back-link:hover { color: var(--accent); border-color: var(--accent); }

/* ── Breadcrumb ─────────────────────────────────────────────── */
.breadcrumb {
  max-width: 1100px;
  margin: 1.25rem auto 0;
  padding: 0 1.5rem;
  font-size: .8rem;
  color: #656d76;
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--accent); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { opacity: .4; }

/* ── Responsive: hide logo text on mobile ───────────────────── */
@media (max-width: 640px) {
  header { padding: 0 1rem; }
  .logo-text, .logo-sub { display: none; }
}