/* --- 1. GLOBAL --- */
body {
    background-color: #121212; color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0; padding: 20px; line-height: 1.6;
}
.container { max-width: 1100px; margin: 0 auto; padding-bottom: 100px; }

/* --- 2. HEADER & NAV --- */
header {
    border-bottom: 2px solid #27ae60; padding-bottom: 20px; margin-bottom: 30px;
    display: flex; justify-content: space-between; align-items: center;
}
h1 { margin: 0; font-size: 1.8rem; color: #fff; }
h2 { color: #2ecc71; margin-top: 0; }
h3 { color: #f0f0f0; }
.level-badge {
    display: inline-block; background: #27ae60; color: #fff;
    font-size: 0.8rem; font-weight: bold; padding: 3px 10px;
    border-radius: 12px; margin-bottom: 6px; letter-spacing: 0.5px;
}
.subtitle { font-size: 0.88rem; color: #aaa; margin-top: 4px; }
.back-link {
    text-decoration: none; color: #888; border: 1px solid #444;
    padding: 5px 10px; border-radius: 4px; font-size: 0.9rem;
    transition: 0.2s; white-space: nowrap;
}
.back-link:hover { color: #fff; border-color: #fff; }
.nav-container { display: flex; gap: 8px; margin-top: 15px; flex-wrap: wrap; }
button.nav-btn {
    background: #1e1e1e; border: 1px solid #333; color: #aaa;
    padding: 10px 16px; cursor: pointer; border-radius: 4px;
    transition: 0.3s; font-weight: bold; font-size: 0.95rem;
}
button.nav-btn.active, button.nav-btn:hover { background: #27ae60; color: white; border-color: #27ae60; }

/* --- 3. SECTIONS --- */
.section-box {
    display: none; background: #1e1e1e; border: 1px solid #333;
    border-top: 4px solid #27ae60; border-radius: 8px;
    padding: 30px; margin-top: 20px; margin-bottom: 40px;
    animation: fadeIn 0.4s ease;
}
.section-box.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* --- 4. VOCABULARY --- */
.vocab-list-single { display: flex; flex-direction: column; gap: 5px; max-width: 850px; margin: 0 auto; }
.vocab-category {
    color: #2ecc71; margin-top: 28px; margin-bottom: 5px;
    border-bottom: 1px solid #444; padding-bottom: 5px;
    text-transform: uppercase; font-size: 0.95rem; letter-spacing: 1px;
}
.vocab-row {
    display: flex; align-items: center; padding: 10px 15px;
    border-bottom: 1px solid #2a2a2a; font-size: 0.98rem;
    background: #222; border-radius: 4px; gap: 5px;
}
.vocab-row:hover { background: #2a2a2a; border-left: 3px solid #27ae60; }
.vocab-row span:first-child { font-weight: bold; width: 185px; color: #fff; flex-shrink: 0; }
.ipa { color: #f39c12; width: 200px; flex-shrink: 0; font-family: 'Lucida Sans Unicode', 'Arial Unicode MS', sans-serif; font-size: 0.88rem; }
.bg { color: #aaa; font-style: italic; margin-right: auto; flex: 1; }
.speak-btn { background: none; border: none; cursor: pointer; font-size: 1.2rem; margin-left: 8px; transition: 0.2s; color: #2ecc71; flex-shrink: 0; padding: 4px; }
.speak-btn:hover { transform: scale(1.15); }
.wide-speak { display: inline-block; margin-top: 10px; background: #1a1a1a; border: 1px solid #444; border-radius: 4px; padding: 6px 12px; font-size: 0.9rem; color: #2ecc71; }
.context-note { background: #1a2a1a; padding: 14px 18px; border-left: 3px solid #2ecc71; color: #ccc; margin-bottom: 25px; font-size: 0.95rem; border-radius: 0 4px 4px 0; }

/* --- 5. GRAMMAR --- */
.rule-box { margin-bottom: 35px; background: #1a1a1a; border: 1px solid #333; border-top: 4px solid #27ae60; border-radius: 8px; padding: 20px 25px; }
.rule-part-header { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 14px; }
.rule-part-num {
    background: #27ae60; color: #fff; font-weight: bold; font-size: 1.1rem;
    width: 36px; height: 36px; border-radius: 50%; display: flex;
    align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px;
}
.rule-part-header h3 { color: #2ecc71; margin: 0 0 4px; font-size: 1.1rem; }
.rule-subtitle { font-size: 0.82rem; color: #888; font-weight: normal; }
.rule-intro { color: #bbb; margin: 0 0 18px; font-size: 0.95rem; }

/* Pronoun pills */
.pill { padding: 3px 10px; border-radius: 12px; font-size: 0.9rem; font-weight: bold; }
.pill-green  { background: #1a3a1a; color: #2ecc71; }
.pill-blue   { background: #1a2a3a; color: #3498db; }
.pill-yellow { background: #3a2a1a; color: #f39c12; }
.pill-purple { background: #2a1a3a; color: #9b59b6; }
.pill-red    { background: #3a1a1a; color: #e74c3c; }

/* RP badges (used in grammar tables) */
.rp { padding: 3px 10px; border-radius: 12px; font-size: 0.9rem; }
.rp-who   { background: #1a3a1a; color: #2ecc71; }
.rp-which { background: #1a2a3a; color: #3498db; }
.rp-where { background: #3a2a1a; color: #f39c12; }
.rp-that  { background: #2a1a3a; color: #9b59b6; }
.rp-whose { background: #3a1a1a; color: #e74c3c; }

.example-compare { display: flex; gap: 15px; align-items: center; flex-wrap: wrap; margin: 15px 0; }
.example-box { background: #252525; border: 1px solid #3a3a3a; padding: 14px 18px; border-radius: 8px; flex: 1; min-width: 200px; }
.highlight-box { border-color: #27ae60; background: #1a2a1a; }
.ex-label { font-size: 0.78rem; color: #888; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.example-box p { margin: 0; color: #ddd; font-size: 0.95rem; }
.arrow-box { font-size: 1.8rem; color: #555; flex-shrink: 0; }

.rule-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 15px; }
.rule-card { background: #252525; border: 1px solid #3a3a3a; padding: 16px; border-radius: 8px; }
.rule-card h4 { color: #f39c12; margin-top: 0; border-bottom: 1px solid #444; padding-bottom: 8px; font-size: 0.95rem; }
.rule-card p.rule-note { color: #888; font-size: 0.85rem; margin-top: 0; font-style: italic; }
.rule-card ul { padding-left: 18px; color: #ccc; font-size: 0.88rem; margin: 0; }
.rule-card ul li { margin-bottom: 10px; line-height: 1.5; }
.tip-box { background: #1a2a3a; border-left: 3px solid #3498db; padding: 8px 12px; margin-top: 12px; border-radius: 0 4px 4px 0; font-size: 0.83rem; color: #8cc8ff; }
.warning-box { background: #2a1a00; border: 1px solid #f39c12; border-radius: 6px; padding: 14px 18px; margin-top: 15px; font-size: 0.9rem; color: #f0c080; line-height: 1.8; }
.warning-box em { color: #ddd; font-style: italic; }

/* Grammar exercises (easy / hard blocks) */
.grammar-ex-block { background: #1e1e1e; border: 1px solid #333; border-radius: 8px; padding: 16px 20px; }
.easy-ex { border-left: 4px solid #2ecc71; }
.hard-ex { border-left: 4px solid #f39c12; }
.ex-instructions { font-size: 0.9rem; color: #ccc; margin-bottom: 12px; }
.g-hint { font-size: 0.8rem; color: #888; font-style: italic; }
.g-item {
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
    padding: 9px 12px; background: #222; border-radius: 6px;
    margin-bottom: 8px; font-size: 0.92rem; color: #ddd; border: 1px solid #2a2a2a;
}
.g-item:hover { background: #252525; }
.g-select {
    background: #2a2a2a; border: 1px solid #444; color: #fff;
    padding: 4px 8px; border-radius: 4px; font-size: 0.9rem; cursor: pointer; transition: border-color 0.2s;
}
.g-select:focus { outline: none; border-color: #27ae60; }
.g-input {
    background: #2a2a2a; border: 1px solid #444; color: #fff;
    padding: 5px 10px; border-radius: 4px; width: 160px;
    font-family: 'Segoe UI', sans-serif; font-size: 0.9rem; transition: border-color 0.2s;
}
.g-input:focus { outline: none; border-color: #27ae60; }
.g-fb { font-size: 0.88rem; font-weight: bold; margin-left: 4px; }
.ex-btn-row { display: flex; align-items: center; gap: 12px; margin-top: 12px; }

/* Tables */
.pro-table { width: 100%; border-collapse: collapse; background: #222; border: 1px solid #333; font-size: 0.9rem; margin-top: 10px; }
.pro-table th { background: #1a1a1a; color: #2ecc71; padding: 12px; text-align: left; border-bottom: 2px solid #333; font-weight: 600; }
.pro-table td { padding: 11px 12px; border-bottom: 1px solid #2a2a2a; color: #e0e0e0; vertical-align: top; }
.pro-table tr:hover { background: #2a2a2a; }

/* --- 6. READING --- */
.newspaper-container { border: 2px solid #444; background: #1a1a1a; padding: 25px; border-radius: 8px; min-height: 480px; }
.newspaper-page { display: none; animation: fadeIn 0.5s; }
.newspaper-page.active { display: block; }
.news-layout { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 20px; }
.news-img {
    flex: 0 0 100px; height: 100px; background: #252525; border: 1px solid #444;
    display: flex; align-items: center; justify-content: center;
    border-radius: 8px; font-size: 3rem; text-align: center;
}
.news-content { flex: 1; min-width: 250px; }
.news-content h3 { color: #f39c12; margin-top: 0; font-size: 1.1rem; }
.news-content p { color: #ccc; font-size: 0.95rem; line-height: 1.75; margin: 0 0 12px; }
.news-controls { display: flex; justify-content: center; align-items: center; margin-top: 20px; }
.reading-quiz { background: #111; padding: 20px; border-radius: 6px; border-left: 3px solid #f39c12; margin-top: 10px; }
.reading-quiz h4 { color: #f39c12; margin: 0 0 15px; }
.mc-q { margin-bottom: 18px; }
.mc-q p { color: #e0e0e0; margin: 0 0 8px; font-weight: bold; font-size: 0.93rem; }
.mc-q label { display: block; padding: 7px 12px; margin-bottom: 4px; border-radius: 4px; cursor: pointer; color: #ccc; border: 1px solid #2a2a2a; transition: 0.15s; font-size: 0.9rem; }
.mc-q label:hover { background: #2a2a2a; border-color: #444; }
.mc-q label input[type="radio"] { margin-right: 8px; accent-color: #27ae60; }
.correct-label { background: #1a3a1a !important; border-color: #2ecc71 !important; color: #2ecc71 !important; }
.wrong-label   { background: #3a1a1a !important; border-color: #e74c3c !important; color: #e74c3c !important; }
.show-correct  { background: #1a2a3a !important; border-color: #3498db !important; color: #3498db !important; }
.mc-fb { font-size: 1rem; font-weight: bold; margin-left: 5px; }
.fb-correct { color: #2ecc71; }
.fb-wrong   { color: #e74c3c; }
.score-display { font-weight: bold; color: #f39c12; margin-left: 12px; font-size: 0.95rem; }
.score-perfect { color: #2ecc71 !important; }

/* --- 7. CLOZE --- */
.cloze-container { background: #1a1a1a; border: 1px solid #333; border-radius: 8px; padding: 25px; }
.cloze-text { font-size: 1rem; color: #ccc; line-height: 2.4; }
.cloze-text p { margin-bottom: 18px; }
.cloze-select {
    background: #252525; border: 2px solid #444; color: #fff;
    padding: 3px 6px; border-radius: 4px; font-size: 0.9rem; cursor: pointer;
    transition: border-color 0.2s; margin: 0 3px; min-width: 90px; vertical-align: middle;
}
.cloze-select:hover { border-color: #27ae60; }
.cloze-correct { border-color: #2ecc71 !important; background: #1a3a1a !important; color: #2ecc71 !important; }
.cloze-wrong   { border-color: #e74c3c !important; background: #3a1a1a !important; color: #e74c3c !important; }
.cloze-controls { display: flex; align-items: center; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.reset-btn { background: #333 !important; color: #ccc !important; }
.reset-btn:hover { background: #444 !important; }
.cloze-feedback-box { background: #1a1a1a; border: 1px solid #444; border-radius: 6px; padding: 15px 20px; margin-top: 15px; font-size: 0.9rem; color: #ccc; }
.cloze-errors { padding-left: 20px; margin: 8px 0 0; }
.cloze-errors li { margin-bottom: 6px; }
.cloze-errors em { color: #e74c3c; }
.cloze-errors strong { color: #2ecc71; }

/* --- 8. DRILLS --- */
.quiz-block { border: 1px solid #2a2a2a; padding: 18px 20px; border-radius: 8px; background: #1a1a1a; margin-bottom: 20px; }
.quiz-header { font-weight: bold; color: #f39c12; margin-bottom: 12px; border-bottom: 1px solid #333; padding-bottom: 8px; font-size: 0.95rem; }
.mini-quiz-item {
    margin-bottom: 10px; padding: 10px 14px; background: #222; border-radius: 6px;
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
    border: 1px solid #2a2a2a; font-size: 0.92rem;
}
.mini-quiz-item:hover { background: #252525; }
.q-num  { color: #888; font-weight: bold; flex-shrink: 0; min-width: 22px; }
.q-text { color: #ddd; flex: 1; min-width: 200px; }
.quiz-input {
    background: #2a2a2a; border: 1px solid #444; color: #fff;
    padding: 5px 10px; border-radius: 4px; width: 140px;
    font-family: 'Segoe UI', sans-serif; font-size: 0.9rem; transition: border-color 0.2s;
}
.quiz-input:focus { outline: none; border-color: #27ae60; }
.check-btn {
    background: #f39c12; color: #000; border: none; padding: 7px 14px;
    border-radius: 4px; cursor: pointer; font-weight: bold; transition: 0.2s;
    flex-shrink: 0; font-size: 0.88rem;
}
.check-btn:hover { background: #e67e22; color: white; }
.drill-feedback { font-size: 0.88rem; font-style: italic; min-width: 80px; }

/* --- 9. RESPONSIVE --- */
@media (max-width: 700px) {
    body { padding: 12px; }
    h1 { font-size: 1.3rem; }
    .section-box { padding: 18px; }
    .rule-grid { grid-template-columns: 1fr; }
    .vocab-row { flex-wrap: wrap; }
    .ipa { width: 100%; }
    .news-img { display: none; }
    .example-compare { flex-direction: column; }
    .pro-table { font-size: 0.8rem; }
    .pro-table td, .pro-table th { padding: 8px; }
}

/* --- 10. TENSE WRITING & GERUND --- */
.drill-instructions { font-size: 0.9rem; color: #bbb; margin-bottom: 12px; padding: 8px 12px; background: #222; border-radius: 4px; border-left: 3px solid #555; }
.drill-fb { font-size: 0.88rem; font-style: italic; min-width: 80px; }
.ex-btn {
    background: #2a2a2a; border: 1px solid #555; color: #ccc;
    padding: 6px 14px; border-radius: 4px; cursor: pointer;
    font-size: 0.88rem; transition: 0.2s; font-weight: bold;
}
.ex-btn:hover { background: #3a3a3a; border-color: #888; color: #fff; }