/**
 * LudumLudere — Crossroads Stylesheet
 * Responsive card grid with dark/light theme toggle for the game platform.
 * Theme: html.dark = dark mode (default), html:not(.dark) = light mode.
 * Toggle persisted via localStorage key "theme".
 */

/* Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* CSS Custom Properties — Dark (default) */
html.dark {
  --bg: #1a1a2e;
  --bg-header: linear-gradient(135deg, #16213e 0%, #0f3460 100%);
  --fg: #eee;
  --fg-muted: #888;
  --fg-dim: #555;
  --card-bg: #16213e;
  --card-border: rgba(15, 52, 96, 0.8);
  --card-border-hover: #e94560;
  --accent: #e94560;
  --tech-bg: rgba(15, 52, 96, 0.6);
  --tech-fg: #53a8b6;
  --footer-border: #16213e;
  --code-bg: #16213e;
  --shadow-hover: rgba(233, 69, 96, 0.15);
  --toggle-bg: #16213e;
  --tab-bg: #0f3460;
  --tab-active-bg: #e94560;
  --tab-fg: #aaa;
  --tab-active-fg: #fff;
  --overlay-bg: rgba(26, 26, 46, 0.85);
}

/* CSS Custom Properties — Light */
html:not(.dark) {
  --bg: #f5f3ef;
  --bg-header: linear-gradient(135deg, #e8e4dd 0%, #d4cfc6 100%);
  --fg: #222;
  --fg-muted: #666;
  --fg-dim: #999;
  --card-bg: #fff;
  --card-border: rgba(0, 0, 0, 0.1);
  --card-border-hover: #c0392b;
  --accent: #c0392b;
  --tech-bg: rgba(0, 0, 0, 0.06);
  --tech-fg: #2980b9;
  --footer-border: #ddd;
  --code-bg: #eee;
  --shadow-hover: rgba(0, 0, 0, 0.12);
  --toggle-bg: #ddd;
  --tab-bg: #e0dcd5;
  --tab-active-bg: #c0392b;
  --tab-fg: #666;
  --tab-active-fg: #fff;
  --overlay-bg: rgba(245, 243, 239, 0.85);
}

/* Base */
body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--bg-header);
  border-bottom: 2px solid var(--accent);
  position: relative;
}

header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  line-height: 1;
}

header .accent {
  color: var(--accent);
}

header p {
  color: var(--fg-muted);
  font-size: 0.85rem;
  line-height: 1;
}

.header-sep {
  color: var(--fg-dim);
  font-size: 0.85rem;
}

/* Theme Toggle */
#theme-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--toggle-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  color: var(--fg);
  transition: background 0.2s ease, border-color 0.2s ease;
  line-height: 1;
}

#theme-toggle:hover {
  border-color: var(--accent);
}

/* Card Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
}

/* Cards */
.card {
  display: flex;
  flex-direction: column;
  aspect-ratio: 1 / 1;
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--fg);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
  border: 1px solid var(--card-border);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow-hover);
  border-color: var(--card-border-hover);
}

.card:active {
  transform: translateY(-2px);
}

.card-thumb {
  flex: 1;
  min-height: 0;
  background: var(--tab-bg) center/cover no-repeat;
  position: relative;
  transition: opacity 0.3s ease;
}

.card-thumb.previewing {
  animation: fadeInPreview 0.3s ease forwards;
}

@keyframes fadeInPreview {
  from { opacity: 0.6; }
  to { opacity: 1; }
}

.card-body {
  padding: 0.8rem 1rem;
  display: flex;
  flex-direction: column;
}

.card-body h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
  font-weight: 600;
}

.card-body p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.5;
  flex: 1;
}

.card-tech {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.25rem 0.7rem;
  background: var(--tech-bg);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--tech-fg);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  align-self: flex-start;
}

/* Empty State */
.no-games {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--fg-dim);
  font-size: 1.15rem;
  grid-column: 1 / -1;
}

.no-games code {
  background: var(--code-bg);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  color: var(--tech-fg);
}

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--fg-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--footer-border);
}

/* -------- Landing Page Styles -------- */

/* Mode tabs */
.mode-tabs {
  display: flex;
  gap: 0;
  background: var(--card-bg);
  border-radius: 8px 8px 0 0;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-bottom: none;
}

.mode-tab {
  flex: 1;
  padding: 0.6rem 1rem;
  text-align: center;
  cursor: pointer;
  background: var(--tab-bg);
  color: var(--tab-fg);
  border: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s ease, color 0.2s ease;
  font-family: inherit;
}

.mode-tab.active {
  background: var(--tab-active-bg);
  color: var(--tab-active-fg);
}

.mode-tab:hover:not(.active) {
  background: var(--card-bg);
  color: var(--fg);
}

/* Game frame container */
.game-frame-container {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  aspect-ratio: 16 / 10;
  background: #000;
  border: 1px solid var(--card-border);
  border-radius: 0 0 8px 8px;
  overflow: hidden;
}

.game-frame-container iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Play overlay */
.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--overlay-bg);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: opacity 0.3s ease;
  z-index: 10;
}

.play-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.play-btn {
  width: 80px;
  height: 80px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.play-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.play-btn::after {
  content: "";
  display: block;
  width: 0;
  height: 0;
  margin-left: 6px;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 28px solid #fff;
}

/* Landing page layout */
.landing-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

.landing-content .game-title {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.landing-content .game-tech {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--tech-bg);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--tech-fg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.landing-content .game-description,
.landing-content .game-controls {
  margin-bottom: 1.5rem;
  line-height: 1.7;
  color: var(--fg-muted);
}

.landing-content .game-description p,
.landing-content .game-controls p {
  margin-bottom: 0.5rem;
}

.landing-content .section-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.back-link {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 1.2rem;
  transition: background 0.2s ease, color 0.2s ease;
  line-height: 1;
}

.back-link:hover {
  background: var(--card-bg);
  color: var(--accent);
}

/* Responsive */
@media (max-width: 640px) {
  header h1 { font-size: 1.1rem; }
  header p { display: none; }
  .header-sep { display: none; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); padding: 1rem; gap: 1rem; }
  .game-frame-container { aspect-ratio: 4 / 3; }
  .landing-content { padding: 1rem; }
}