/* =============================================
   SlideForge AI — layout.css
   Nav, Page Layouts, Grid, Responsive
   ============================================= */

/* ── Top Nav ───────────────────────────────── */
.topnav {
  height: var(--nav-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 200;
  backdrop-filter: blur(12px);
}
.topnav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.topnav-logo img,
.topnav-logo svg { width: 32px; height: 32px; }
.topnav-logo-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -.02em;
}
.topnav-logo-name span { color: var(--accent); }
.topnav-center { flex: 1; display: flex; align-items: center; justify-content: center; }
.topnav-right  { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.topnav-divider { width: 1px; height: 28px; background: var(--border); margin: 0 4px; }

/* ── Landing Nav ───────────────────────────── */
.landing-nav {
  height: var(--nav-h);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  padding: 0 clamp(16px, 5vw, 80px);
  gap: 16px;
  transition: background var(--transition-md), border-color var(--transition-md);
}
.landing-nav.scrolled {
  background: rgba(8,12,20,.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
}
.landing-nav .nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.landing-nav .nav-link { padding: 8px 14px; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 500; color: var(--text-secondary); transition: color var(--transition), background var(--transition); }
.landing-nav .nav-link:hover { color: var(--text-primary); background: var(--bg-elevated); text-decoration: none; }

/* ── Container ─────────────────────────────── */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 48px);
}
.container-sm { max-width: 760px; }
.container-md { max-width: 960px; }

/* ── App page layout ───────────────────────── */
.app-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
  height: calc(100vh - var(--nav-h));
  overflow: hidden;
}
.app-left {
  overflow-y: auto;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.app-right {
  overflow-y: auto;
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
}
.app-panel-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.app-panel-body { padding: 20px 24px; flex: 1; display: flex; flex-direction: column; gap: 20px; }

/* ── Editor layout ─────────────────────────── */
.editor-layout {
  display: grid;
  grid-template-columns: 220px 1fr 300px;
  height: calc(100vh - var(--nav-h));
  overflow: hidden;
}
.editor-slides {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
}
.editor-canvas {
  overflow-y: auto;
  background: var(--bg-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px;
  gap: 16px;
}
.editor-panel {
  border-left: 1px solid var(--border);
  overflow-y: auto;
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
}

/* ── Slides list ───────────────────────────── */
.slides-list-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.slides-list-body {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.slide-thumb {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition-md);
  position: relative;
  aspect-ratio: 16/9;
  background: var(--bg-card);
}
.slide-thumb:hover  { border-color: var(--accent); }
.slide-thumb.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(91,143,249,.25); }
.slide-thumb-num {
  position: absolute;
  top: 4px; left: 6px;
  font-size: .6rem;
  font-weight: 700;
  color: rgba(255,255,255,.6);
  z-index: 2;
}
.slide-thumb-inner { width: 100%; height: 100%; transform-origin: top left; }

/* ── Settings page layout ──────────────────── */
.settings-layout {
  max-width: 700px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.settings-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.settings-section-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.settings-section-icon {
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.settings-section-body { padding: 20px 24px; display: flex; flex-direction: column; gap: 18px; }
.settings-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.settings-row-info h4 { font-size: .95rem; margin-bottom: 2px; }
.settings-row-info p  { font-size: .8125rem; color: var(--text-muted); }

/* ── History page ──────────────────────────── */
.history-layout {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.history-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color var(--transition-md);
}
.history-card:hover { border-color: var(--accent); }
.history-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-dim);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--accent);
  font-size: 1.3rem;
}
.history-card-info { flex: 1; min-width: 0; }
.history-card-title { font-weight: 700; font-size: 1rem; margin-bottom: 4px; }
.history-card-meta { font-size: .8125rem; color: var(--text-muted); display: flex; gap: 12px; flex-wrap: wrap; }
.history-card-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ── Grid helpers ──────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.grid-themes { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.grid-6 { display: grid; grid-template-columns: repeat(6,1fr); gap: 10px; }

/* ── Mobile wizard (app page) ──────────────── */
.wizard-tabs-bar {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  z-index: 100;
  height: 60px;
}
.wizard-tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: .65rem;
  font-weight: 600;
  color: var(--text-muted);
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 6px 4px;
  transition: color var(--transition);
}
.wizard-tab-btn.active { color: var(--accent); }
.wizard-tab-btn svg { width: 20px; height: 20px; }

/* ── Responsive ────────────────────────────── */
@media (max-width: 1100px) {
  .editor-layout { grid-template-columns: 180px 1fr 260px; }
}

@media (max-width: 900px) {
  .app-layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .app-left  { border-right: none; border-bottom: 1px solid var(--border); height: auto; max-height: 50vh; }
  .app-right { height: calc(50vh - var(--nav-h)); }
  .editor-layout { grid-template-columns: 1fr 280px; }
  .editor-slides  { display: none; }
  .grid-6 { grid-template-columns: repeat(3,1fr); }
}

@media (max-width: 700px) {
  .topnav { padding: 0 16px; }
  .topnav-logo-name { display: none; }
  .landing-nav .nav-links { display: none; }
  .editor-layout { grid-template-columns: 1fr; }
  .editor-panel  { display: none; }
  .wizard-tabs-bar { display: flex; }
  .app-layout { height: calc(100vh - var(--nav-h) - 60px); }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2,1fr); }
  .grid-themes { grid-template-columns: repeat(2,1fr); }
  .history-card { flex-wrap: wrap; }
  .history-card-actions { width: 100%; }
  .settings-row { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .grid-3 { grid-template-columns: 1fr; }
  .editor-canvas { padding: 16px 12px; }
}