:root {
  --text: #111;
  --bg: #e5e4df;
  --window: #f4f3ef;
  --bar: #d1cfca;
  --border: #000;
  --shadow: #999;
  --hover: #c4c2bc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  font-family: 'Inter', sans-serif;
  color: var(--text);
}

/* Navbar */
nav {
  background: var(--bar);
  border-bottom: 2px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 25px;
  font-family: 'Press Start 2P', cursive;
  font-size: 10px;
}
nav a {
  text-decoration: none;
  color: var(--border);
  margin: 0 10px;
  transition: color 0.2s;
}
nav a:hover { color: #666; }

/* Header */
header {
  border-bottom: 2px solid var(--border);
  background: var(--bg);
  padding: 25px 5%;
}
header h1 {
  font-family: 'Press Start 2P', cursive;
  font-size: 16px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
header p {
  max-width: 800px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* Sub-nav */
.sub-nav {
  display: flex;
  flex-wrap: wrap;
  background: var(--bar);
  border-bottom: 2px solid var(--border);
  padding: 10px 5%;
  gap: 15px;
}
.sub-nav a {
  font-family: 'Press Start 2P', cursive;
  font-size: 9px;
  color: var(--border);
  text-decoration: none;
  padding: 10px 18px;
  border: 2px solid var(--border);
  background: var(--window);
  transition: all 0.2s ease;
}
.sub-nav a:hover {
  background: var(--hover);
  box-shadow: 2px 2px 0 var(--border);
}

/* Card Section */
.card-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  padding: 60px 5%;
}

.card {
  background: var(--window);
  border: 3px solid var(--border);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 8px 8px 0 var(--border);
}
.card-header {
  background: var(--bar);
  border-bottom: 2px solid var(--border);
  padding: 8px 10px;
  font-family: 'Press Start 2P', cursive;
  font-size: 9px;
  display: flex;
  justify-content: space-between;
}
.book-content, .tool-content {
  display: flex;
  gap: 15px;
  margin-top: 10px;
}
.book-content img, .tool-content img {
  width: 100px;
  height: 140px;
  object-fit: cover;
  border: 2px solid var(--border);
}
.book-info h2, .tool-info h3 {
  margin: 0 0 6px;
  font-size: 18px;
}
.author { font-size: 13px; color: #444; margin-bottom: 10px; }
.review { font-size: 14px; line-height: 1.5; }
.rating { font-size: 13px; margin-top: 8px; color: #333; }

/* Tool Section */
.tool-section, .fun-section {
  padding: 60px 5%;
  border-top: 3px dashed var(--border);
}
.tool-section h2, .fun-section h2 {
  font-family: 'Press Start 2P', cursive;
  font-size: 14px;
  text-transform: uppercase;
}
.tool-intro {
  font-size: 14px;
  color: #333;
  margin-bottom: 30px;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}
.tool-card img {
  width: 64px;
  height: 64px;
  border: 2px solid var(--border);
}
.tool-btn {
  display: inline-block;
  margin-top: 10px;
  background: var(--bar);
  padding: 6px 14px;
  border: 2px solid var(--border);
  text-decoration: none;
  font-family: 'Press Start 2P', cursive;
  font-size: 9px;
  color: #000;
}
.tool-btn:hover { background: var(--hover); }

.suggest-tool {
  text-align: center;
  margin-top: 30px;
}

/* Footer */
footer {
  text-align: center;
  padding: 25px;
  border-top: 3px solid var(--border);
  background: var(--bar);
  font-family: 'Press Start 2P', cursive;
  font-size: 10px;
}


/* === Dark Mode === */
.dark {
  --bg: #121212;
  --window: #1e1e1e;
  --text: #f4f4f4;
  --bar: #2a2a2a;
  --border: #f4f4f4;
  --shadow: #000;
  --hover: #333;
  color: #f4f4f4;
}

.mode-btn {
  background: var(--bar);
  border: 2px solid var(--border);
  font-family: 'Press Start 2P', cursive;
  font-size: 10px;
  padding: 6px 10px;
  cursor: pointer;
  transition: 0.2s;
}
.mode-btn:hover { background: var(--hover); }