/* =========================================================
   Fórmula de Bhaskara — Estilo Principal
   Prof. Mariano Miguel Lanzi
   ========================================================= */

:root {
  --bg-main: #0d1117;
  --bg-sidebar: #161b22;
  --bg-card: #1c2333;
  --bg-input: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --accent-gold: #d4a72c;
  --accent-green: #3fb950;
  --accent-red: #f85149;
  --accent-purple: #a371f7;
  --border: #30363d;
  --border-light: #21262d;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --radius: 8px;
  --transition: 0.2s ease;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --sidebar-width: 260px;
}

[data-theme="light"] {
  --bg-main: #f6f8fa;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f0f2f5;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --accent: #d97706;
  --accent-hover: #b45309;
  --border: #e2e8f0;
  --border-light: #e2e8f0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); background: var(--bg-main); color: var(--text-primary); line-height: 1.7; display: flex; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
code { font-family: var(--font-mono); background: var(--bg-input); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }

.sidebar { position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh; background: var(--bg-sidebar); border-right: 1px solid var(--border); overflow-y: auto; z-index: 100; padding: 24px 0; display: flex; flex-direction: column; }
.sidebar-header { padding: 0 20px 20px; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.sidebar-header h2 { font-size: 1.1rem; color: var(--accent-gold); line-height: 1.3; }
.sidebar-header small { font-size: 0.75rem; color: var(--text-muted); }
.sidebar-nav { flex: 1; padding: 0 8px; }
.sidebar-nav a { display: block; padding: 8px 16px; color: var(--text-secondary); border-radius: 6px; font-size: 0.8rem; transition: all var(--transition); margin-bottom: 2px; }
.sidebar-nav a:hover, .sidebar-nav a.active { background: rgba(245, 158, 11, 0.1); color: var(--accent); }
.sidebar-nav a.active { border-left: 3px solid var(--accent); padding-left: 13px; }
.sidebar-nav .nav-home { font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid var(--border); font-size: 0.7rem; color: var(--text-muted); }

.theme-toggle { display: flex; align-items: center; gap: 8px; padding: 10px 20px; margin: 12px 8px 0; cursor: pointer; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-input); color: var(--text-secondary); font-size: 0.8rem; transition: all var(--transition); }
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

.main { margin-left: var(--sidebar-width); flex: 1; min-width: 0; }
.container { max-width: 900px; margin: 0 auto; padding: 40px 32px 80px; }

.page-header { text-align: center; padding: 60px 0 40px; border-bottom: 1px solid var(--border); margin-bottom: 40px; }
.page-header h1 { font-size: 2rem; color: var(--accent-gold); margin-bottom: 8px; }
.page-header .subtitle { font-size: 1.1rem; color: var(--text-secondary); }
.page-header .author { font-size: 0.85rem; color: var(--text-muted); margin-top: 8px; }

.section { margin-bottom: 48px; }
.section h2 { font-size: 1.5rem; color: var(--accent); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.section h3 { font-size: 1.2rem; color: var(--accent-hover); margin: 24px 0 12px; }
.section h4 { font-size: 1rem; color: var(--text-primary); margin: 20px 0 8px; }
.section p { margin-bottom: 14px; color: var(--text-secondary); }
.section ul, .section ol { margin: 8px 0 14px 20px; color: var(--text-secondary); }
.section li { margin-bottom: 6px; }

.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin: 20px 0; box-shadow: var(--shadow); }
.card h3 { margin-top: 0; color: var(--accent-gold); }
.card.info { border-left: 4px solid var(--accent); }
.card.warning { border-left: 4px solid var(--accent-gold); }
.card.success { border-left: 4px solid var(--accent-green); }

.eq-wrapper { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; margin: 16px 0; overflow-x: auto; text-align: center; }

.canvas-container { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); margin: 20px 0; padding: 16px; box-shadow: var(--shadow); text-align: center; }
.canvas-container canvas { display: block; margin: 0 auto; max-width: 100%; border-radius: 4px; background: var(--bg-input); }
.canvas-controls { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; align-items: center; justify-content: center; }
.canvas-controls input[type="range"] { width: 200px; accent-color: var(--accent); }
.canvas-controls input[type="number"] { width: 80px; padding: 6px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-input); color: var(--text-primary); font-family: var(--font-sans); font-size: 0.85rem; }
.canvas-controls input[type="number"]:focus { border-color: var(--accent); outline: none; }
.canvas-controls button, .canvas-controls select { padding: 8px 16px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-input); color: var(--text-primary); font-family: var(--font-sans); font-size: 0.85rem; cursor: pointer; transition: all var(--transition); }
.canvas-controls button:hover, .canvas-controls select:hover { border-color: var(--accent); color: var(--accent); }

.step-demo { margin: 16px 0; }
.step-demo .step { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 8px; display: none; }
.step-demo .step.show { display: block; }
.step-demo .step p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 8px; }

details { margin: 12px 0; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
details summary { padding: 14px 20px; cursor: pointer; font-weight: 600; color: var(--accent); }
details .example-content { padding: 0 20px 20px; }

.calc-result { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-top: 16px; }
.calc-result .root { background: var(--bg-input); padding: 10px 16px; border-radius: 6px; margin: 6px 0; font-family: var(--font-mono); }

.exercise-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin: 16px 0; }
.exercise-card input[type="text"] { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-input); color: var(--text-primary); font-family: var(--font-mono); font-size: 0.9rem; width: 100%; margin: 6px 0; }

.game-area { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; text-align: center; margin: 20px 0; }
.game-area .game-timer { font-size: 3rem; font-weight: 800; color: var(--accent); }
.game-area .game-score { font-size: 1.2rem; color: var(--accent-green); margin: 8px 0; }

.progress-bar { width: 100%; height: 8px; background: var(--bg-input); border-radius: 4px; margin: 8px 0; overflow: hidden; }
.progress-bar .fill { height: 100%; background: var(--accent); border-radius: 4px; transition: width 0.3s ease; }

.certificate { background: #fff; color: #1a1a2e; padding: 40px; border: 4px double #f59e0b; border-radius: 8px; text-align: center; max-width: 600px; margin: 20px auto; display: none; }
.certificate h2 { color: #b45309; font-size: 1.8rem; border-bottom: 2px solid #f59e0b; display: inline-block; padding-bottom: 8px; }
.certificate .cert-name { font-size: 2rem; color: #1a1a2e; margin: 16px 0; }
.certificate .cert-detail { color: #4a5568; margin: 6px 0; }

/* ====== QUIZ ====== */
.quiz-container { margin: 40px 0; }
.quiz-question { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin-bottom: 16px; }
.quiz-question h4 { color: var(--text-primary); margin-bottom: 12px; }
.quiz-options { display: flex; flex-direction: column; gap: 8px; }
.quiz-option { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: var(--bg-input); border: 1px solid var(--border-light); border-radius: 6px; cursor: pointer; transition: all var(--transition); font-size: 0.9rem; color: var(--text-secondary); }
.quiz-option:hover { border-color: var(--accent); background: rgba(245,158,11,0.05); }
.quiz-option input[type="radio"] { accent-color: var(--accent); width: 16px; height: 16px; }
.quiz-option.correct { border-color: var(--accent-green) !important; background: rgba(63,185,80,0.1) !important; color: var(--accent-green) !important; }
.quiz-option.incorrect { border-color: var(--accent-red) !important; background: rgba(248,81,73,0.1) !important; color: var(--accent-red) !important; }
.quiz-feedback { margin-top: 8px; font-size: 0.85rem; padding: 8px 12px; border-radius: 4px; display: none; }
.quiz-feedback.show { display: block; }
.quiz-feedback.correct { background: rgba(63,185,80,0.1); color: var(--accent-green); border: 1px solid rgba(63,185,80,0.3); }
.quiz-feedback.incorrect { background: rgba(248,81,73,0.1); color: var(--accent-red); border: 1px solid rgba(248,81,73,0.3); }
.quiz-actions { display: flex; gap: 12px; margin-top: 24px; }
.btn { padding: 10px 20px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-card); color: var(--text-primary); cursor: pointer; font-family: var(--font-sans); font-size: 0.9rem; transition: all var(--transition); }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.quiz-score { text-align: center; font-size: 1.2rem; font-weight: 600; margin-top: 16px; padding: 12px; border-radius: var(--radius); display: none; }
.quiz-score.show { display: block; }
.quiz-score.good { background: rgba(63,185,80,0.1); color: var(--accent-green); border: 1px solid rgba(63,185,80,0.3); }
.quiz-score.medium { background: rgba(212,167,44,0.1); color: var(--accent-gold); border: 1px solid rgba(212,167,44,0.3); }
.quiz-score.bad { background: rgba(248,81,73,0.1); color: var(--accent-red); border: 1px solid rgba(248,81,73,0.3); }

.page-footer { text-align: center; padding: 24px; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.8rem; margin-top: 48px; }
.page-footer a { color: var(--text-secondary); }

@media (max-width: 768px) {
  .sidebar { position: relative; width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 16px 0; }
  .sidebar-nav { display: flex; flex-wrap: wrap; gap: 4px; padding: 0 12px; }
  .sidebar-nav a { font-size: 0.72rem; padding: 6px 10px; }
  body { flex-direction: column; } .main { margin-left: 0; } .container { padding: 24px 16px 60px; }
  .page-header h1 { font-size: 1.5rem; }
  .canvas-container canvas { width: 100% !important; height: auto !important; }
}