/* === INGLÉS 2º ESO — Repaso Interactivo === */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #212529;
  --text2: #6c757d;
  --primary: #4dabf7;
  --primary-dark: #339af0;
  --success: #51cf66;
  --success-bg: #e6fcf5;
  --error: #ff6b6b;
  --error-bg: #fff5f5;
  --warn: #ffd43b;
  --border: #dee2e6;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 10px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Layout */
.container {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
}

.sidebar h1 {
  font-size: 1.3rem;
  margin-bottom: 4px;
  color: var(--primary-dark);
}

.sidebar .subtitle {
  font-size: 0.75rem;
  color: var(--text2);
  margin-bottom: 20px;
}

.sidebar h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text2);
  margin: 18px 0 8px;
}

.sidebar a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 2px;
  transition: all 0.15s;
}

.sidebar a:hover, .sidebar a.active {
  background: var(--primary);
  color: white;
}

/* Main content */
.main {
  flex: 1;
  padding: 30px 40px;
  max-width: 800px;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text2);
  margin-bottom: 8px;
}

h1.page-title {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

p.intro {
  color: var(--text2);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

/* Cards / sections */
.section {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.section h2 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}

.section h3 {
  font-size: 1rem;
  margin: 18px 0 10px;
  color: var(--primary-dark);
}

/* Theory blocks */
.theory-box {
  background: #e7f5ff;
  border-left: 4px solid var(--primary);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  margin: 12px 0;
}

.theory-box code {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Consolas', monospace;
  font-size: 0.9em;
}

/* New enhanced exercise cards */
.exercise-card {
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin: 12px 0;
  position: relative;
}

.exercise-card .stem {
  font-size: 1rem;
  margin-bottom: 10px;
  line-height: 1.6;
}

.exercise-card .stem .arrow {
  color: var(--primary-dark);
  font-weight: bold;
  margin: 0 8px;
}

.exercise-card input[type="text"] {
  display: block;
  width: 100%;
  max-width: 450px;
  border: 2px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.95rem;
  margin-bottom: 8px;
  transition: border-color 0.2s;
}

.exercise-card input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
}

.exercise-card textarea {
  display: block;
  width: 100%;
  max-width: 600px;
  min-height: 50px;
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  margin-bottom: 8px;
  resize: vertical;
  transition: border-color 0.2s;
}

.exercise-card textarea:focus {
  outline: none;
  border-color: var(--primary);
}

/* Input states */
input.correct, textarea.correct {
  border-color: var(--success) !important;
  background: var(--success-bg) !important;
}

input.wrong, textarea.wrong {
  border-color: var(--error) !important;
  background: var(--error-bg) !important;
}

/* Button row per exercise */
.btn-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.btn-row .btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  padding: 5px 12px;
  border-radius: 5px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-check {
  background: var(--primary);
  color: white;
}
.btn-check:hover { background: var(--primary-dark); }

.btn-answer {
  background: #fab005;
  color: #212529;
}
.btn-answer:hover { background: #f59f00; }

/* Correction feedback */
.feedback-line {
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 4px;
  margin-top: 4px;
  display: none;
}
.feedback-line.show { display: inline-block; }
.feedback-line.ok {
  background: var(--success-bg);
  color: #2b8a3e;
}
.feedback-line.ko {
  background: var(--error-bg);
  color: #c92a2a;
}

/* Hints */
.hint-box {
  display: none;
  background: #fff9db;
  border: 1px solid #ffd43b;
  border-radius: 6px;
  padding: 10px 14px;
  margin-top: 6px;
  font-size: 0.88rem;
}
.hint-box.show { display: block; }
.hint-box .correct-answer {
  color: var(--success);
  font-weight: bold;
}

/* Section buttons */
.btn-section {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.btn-section .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-check-all { background: var(--primary); color: white; }
.btn-check-all:hover { background: var(--primary-dark); }

.btn-reset {
  background: #dee2e6;
  color: var(--text);
}
.btn-reset:hover { background: #ced4da; }

.btn-next {
  background: #20c997;
  color: white;
}
.btn-next:hover { background: #12b886; }
.btn-next:disabled {
  background: #adb5bd;
  cursor: default;
  opacity: 0.7;
}

/* Score box */
.score-box {
  background: var(--card);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  padding: 16px;
  margin: 16px 0;
  text-align: center;
  font-size: 1rem;
}
.score-box .big {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--primary-dark);
}

/* Example block */
.example {
  background: #f1f3f5;
  padding: 10px 14px;
  border-radius: 6px;
  margin: 8px 0;
  font-style: italic;
}
.example .en { color: #1864ab; }
.example .es { color: var(--text2); font-size: 0.9em; }

/* Responsive */
@media (max-width: 900px) {
  .sidebar { width: 200px; padding: 14px; }
  .main { padding: 20px; }
}

@media (max-width: 700px) {
  .container { flex-direction: column; }
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .main { padding: 16px; }
}

/* Print */
@media print {
  .sidebar, .btn, .btn-section, .btn-row { display: none; }
  .main { max-width: 100%; padding: 0; }
  input, select, textarea { border: 1px solid #ccc !important; background: #f9f9f9 !important; }
}