:root {
  --green: #00B14F;
  --green-dark: #009640;
  --dark-bg: #1A1A2E;
  --accent: #16213E;
  --text: #333;
  --light-bg: #F4F6F8;
  --white: #FFFFFF;
  --gray: #B0B0B0;
  --border: #E0E0E0;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--light-bg); color: var(--text); line-height: 1.6; }

/* Header */
.hero { background: var(--dark-bg); color: var(--white); padding: 40px 40px 32px; text-align: center; }
.hero h1 { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.hero h1 .green { color: var(--green); }
.hero .subtitle { color: var(--gray); font-size: 16px; margin-bottom: 16px; }
.hero .tagline { color: var(--green); font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }

/* Module hero (for individual pages) */
.module-hero { background: var(--dark-bg); color: var(--white); padding: 32px 40px; }
.module-hero .back-link { color: var(--green); text-decoration: none; font-size: 13px; display: inline-block; margin-bottom: 14px; }
.module-hero .back-link:hover { text-decoration: underline; }
.module-hero h1 { font-size: 26px; font-weight: 700; margin-bottom: 6px; }
.module-hero .mod-subtitle { color: var(--gray); font-size: 15px; }
.module-duration { display: inline-block; background: var(--green); color: var(--white); padding: 3px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; margin-top: 10px; }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 30px 20px 60px; }

/* Module cards grid (index page) */
.module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; margin: 24px 0; }
.module-card { background: var(--white); border-radius: 12px; padding: 24px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); border-top: 4px solid var(--green); text-decoration: none; color: var(--text); transition: transform 0.2s, box-shadow 0.2s; display: block; }
.module-card:hover { transform: translateY(-4px); box-shadow: 0 6px 16px rgba(0,0,0,0.12); }
.module-card .card-emoji { font-size: 32px; margin-bottom: 10px; }
.module-card h3 { font-size: 16px; color: var(--dark-bg); margin-bottom: 6px; }
.module-card p { font-size: 13px; color: #666; margin-bottom: 10px; }
.module-card .card-duration { font-size: 11px; color: var(--green); font-weight: 600; }

/* Info cards */
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 24px 0; }
.info-card { background: var(--white); border-radius: 10px; padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); border-left: 4px solid var(--green); }
.info-card .card-icon { font-size: 24px; margin-bottom: 8px; }
.info-card h4 { font-size: 14px; margin-bottom: 4px; color: var(--dark-bg); }
.info-card p { font-size: 13px; color: #666; }

/* Content sections */
.section { background: var(--white); border-radius: 12px; padding: 28px; margin-bottom: 24px; box-shadow: 0 1px 4px rgba(0,0,0,0.06); }
.section h2 { font-size: 18px; color: var(--dark-bg); margin-bottom: 12px; }
.section h3 { font-size: 16px; color: var(--dark-bg); margin: 20px 0 8px; padding-top: 14px; border-top: 1px solid var(--border); }
.section h4 { font-size: 14px; color: #555; margin: 12px 0 6px; }
.section p, .section li { font-size: 14px; }
.section ul { margin: 8px 0 8px 20px; }

/* Steps table */
.steps-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.steps-table th { background: var(--light-bg); padding: 10px 14px; text-align: left; font-weight: 600; }
.steps-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); }

/* Prompt block */
.prompt-block { position: relative; background: #1e1e2e; border-radius: 8px; margin: 14px 0; overflow: hidden; }
.prompt-label { background: var(--accent); color: var(--gray); padding: 6px 14px; font-size: 11px; font-weight: 600; letter-spacing: 0.5px; display: flex; justify-content: space-between; align-items: center; }
.prompt-text { color: #E0E0E0; padding: 16px; font-family: 'SF Mono', 'Fira Code', Consolas, monospace; font-size: 12.5px; line-height: 1.7; white-space: pre-wrap; word-wrap: break-word; max-height: 400px; overflow-y: auto; }
.copy-btn { background: var(--green); color: var(--white); border: none; padding: 5px 14px; border-radius: 4px; font-size: 11px; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.copy-btn:hover { background: var(--green-dark); }
.copy-btn.copied { background: #555; }

/* Checkpoint */
.checkpoint { background: #F0FFF4; border-left: 4px solid var(--green); border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 16px 0; font-size: 13px; }
.checkpoint strong { color: var(--green-dark); }

/* Accomplishments */
.accomplishments { background: var(--light-bg); border-radius: 8px; padding: 18px; margin-top: 20px; }
.accomplishments h4 { margin-bottom: 8px; color: var(--dark-bg); }
.accomplishments li { font-size: 13px; margin-bottom: 4px; }

/* Notice */
.notice { background: #FFF8E1; border-left: 4px solid #F5A623; border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 16px 0; font-size: 13px; }

/* Footer */
.footer { text-align: center; padding: 40px 20px; color: #999; font-size: 12px; }
.footer .logo { color: var(--green); font-weight: 700; font-size: 16px; margin-bottom: 6px; }

/* Nav pagination */
.page-nav { display: flex; justify-content: space-between; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); }
.page-nav a { color: var(--green); text-decoration: none; font-size: 14px; font-weight: 600; }
.page-nav a:hover { text-decoration: underline; }

/* Summary table */
.summary-table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.summary-table th { background: var(--dark-bg); color: var(--white); padding: 12px 16px; text-align: left; font-size: 13px; }
.summary-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 13px; }
.summary-table tr:hover { background: #F9FAFB; }

/* Sidebar navigation for module pages */
.sidebar { position: fixed; left: 0; top: 0; width: 220px; height: 100vh; background: var(--dark-bg); padding: 20px 0; overflow-y: auto; z-index: 200; }
.sidebar .sidebar-title { color: var(--green); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; padding: 0 16px 12px; border-bottom: 1px solid var(--accent); margin-bottom: 8px; }
.sidebar a { display: block; padding: 10px 16px; font-size: 13px; color: var(--gray); text-decoration: none; border-left: 3px solid transparent; transition: all 0.2s; }
.sidebar a:hover { color: var(--white); background: var(--accent); }
.sidebar a.active { color: var(--green); border-left-color: var(--green); background: var(--accent); }
.sidebar .home-link { color: var(--green); font-size: 12px; padding: 8px 16px; margin-bottom: 4px; }
.sidebar .home-link:hover { color: var(--white); }
.sidebar .divider { height: 1px; background: var(--accent); margin: 8px 16px; }

/* Adjust layout when sidebar is present */
.has-sidebar .module-hero { margin-left: 220px; }
.has-sidebar .container { margin-left: 220px; max-width: calc(100% - 260px); padding: 30px 40px 60px; }
.has-sidebar .footer { margin-left: 220px; }

@media (max-width: 900px) {
  .sidebar { display: none; }
  .has-sidebar .module-hero,
  .has-sidebar .container,
  .has-sidebar .footer { margin-left: 0; }
}

/* Slide viewer */
.slide-viewer { background: #161B22; border-radius: 12px; padding: 20px; margin: 16px 0; }
.slide-viewer .slide-container { position: relative; width: 100%; aspect-ratio: 16/9; overflow: hidden; border-radius: 8px; background: #000; }
.slide-viewer .slide-container img { width: 100%; height: 100%; object-fit: contain; display: none; }
.slide-viewer .slide-container img.active { display: block; }
.slide-controls { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }
.slide-controls button { background: #1A365D; color: #fff; border: none; padding: 8px 20px; border-radius: 6px; font-size: 13px; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.slide-controls button:hover { background: #ED8936; }
.slide-controls button:disabled { background: #333; cursor: default; opacity: 0.5; }
.slide-controls .slide-counter { color: #888; font-size: 13px; }
.slide-dots { display: flex; justify-content: center; gap: 6px; margin-top: 10px; }
.slide-dots .dot { width: 10px; height: 10px; border-radius: 50%; background: #333; cursor: pointer; transition: background 0.2s; }
.slide-dots .dot.active { background: #ED8936; }
.slide-dots .dot:hover { background: #718096; }