/* --- 1. GLOBAL STYLES (Green Theme) --- */
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; }

.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-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: 800px; margin: 0 auto; }
.vocab-category { color: #2ecc71; margin-top: 25px; margin-bottom: 5px; border-bottom: 1px solid #444; padding-bottom: 5px; text-transform: uppercase; font-size: 1rem; }
.vocab-row { display: flex; align-items: center; padding: 10px 15px; border-bottom: 1px solid #333; font-size: 1rem; background: #222; border-radius: 4px; }
.vocab-row:hover { background: #2a2a2a; border-left: 3px solid #27ae60; }
.vocab-row span:first-child { font-weight: bold; width: 200px; color: #fff; }
.ipa { color: #f39c12; width: 140px; font-family: 'Lucida Sans Unicode', 'Arial Unicode MS', sans-serif; font-size: 0.9rem; }
.bg { color: #aaa; font-style: italic; margin-right: auto; }
.speak-btn { background: none; border: none; cursor: pointer; font-size: 1.2rem; margin-left: 10px; filter: grayscale(1); transition: 0.2s; color: #2ecc71; }
.speak-btn:hover { filter: grayscale(0); transform: scale(1.1); }
.context-note { background: #2a2a2a; padding: 15px; border-left: 3px solid #2ecc71; color: #ccc; margin-bottom: 20px; font-size: 0.95rem; border-radius: 0 4px 4px 0; }

/* --- 5. GRAMMAR RULES --- */
.rule-box { margin-bottom: 40px; border-bottom: 1px solid #333; padding-bottom: 30px; }
.rule-box:last-child { border-bottom: none; }
.rule-box h3 { color: #2ecc71; font-size: 1.15rem; margin-bottom: 8px; }
.rule-intro { color: #bbb; margin-bottom: 15px; font-size: 0.95rem; }
.rule-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 20px; }
.three-col { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.rule-card { background: #252525; border: 1px solid #444; padding: 15px; border-radius: 8px; }
.rule-card h4 { color: #f39c12; margin-top: 0; border-bottom: 1px solid #555; padding-bottom: 5px; font-size: 0.95rem; }
.rule-card ul { padding-left: 18px; color: #ccc; font-size: 0.88rem; margin: 0; }
.rule-card ul li { margin-bottom: 6px; }
.pro-table { width: 100%; border-collapse: collapse; background: #222; border: 1px solid #333; font-size: 0.93rem; margin-bottom: 20px; }
.pro-table th { background: #1a1a1a; color: #2ecc71; padding: 12px; text-align: left; border-bottom: 2px solid #333; font-weight: 600; }
.pro-table td { padding: 10px 12px; border-bottom: 1px solid #333; color: #e0e0e0; vertical-align: top; }
.pro-table tr:hover { background: #2a2a2a; }

/* --- 6. GRAMMAR EXERCISE BLOCKS --- */
.grammar-ex-block {
    background: #1a1a1a;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #333;
}
.easy-ex { border-left: 4px solid #27ae60; }
.hard-ex { border-left: 4px solid #e67e22; }
.ex-instructions {
    color: #ddd;
    margin-bottom: 15px;
    font-size: 0.95rem;
    background: #252525;
    padding: 10px 14px;
    border-radius: 5px;
}
.g-item {
    margin-bottom: 12px;
    padding: 8px 10px;
    background: #222;
    border-radius: 4px;
    font-size: 0.93rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    color: #ddd;
    border: 1px solid #333;
}
.g-select {
    background: #333;
    border: 1px solid #555;
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Segoe UI', sans-serif;
    font-size: 0.9rem;
    cursor: pointer;
}
.g-input {
    background: #333;
    border: 1px solid #555;
    color: #fff;
    padding: 5px 10px;
    border-radius: 4px;
    width: 160px;
    font-family: 'Segoe UI', sans-serif;
    font-size: 0.9rem;
}
.g-input.wide-input { width: 320px; }
.g-fb { font-weight: bold; font-size: 0.9rem; }
.ex-btn-row { 
    display: flex; 
    align-items: center; 
    gap: 15px; 
    margin-top: 15px; 
    padding-top: 12px; 
    border-top: 1px solid #333; 
}

/* --- 7. READING --- */
.newspaper-container { border: 2px solid #555; background: #222; padding: 20px; border-radius: 8px; min-height: 450px; position: relative; }
.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: 120px; background: #333; border: 1px solid #444; display:flex; align-items:center; justify-content:center; border-radius: 5px; font-size: 3rem; }
.news-content { flex: 3; min-width: 250px; }
.news-content h3 { color: #f39c12; margin-top: 0; }
.news-content p { color: #ddd; font-size: 0.95rem; line-height: 1.7; margin: 0 0 10px; }
.news-controls { display: flex; justify-content: center; align-items: center; margin-top: 20px; }
.reading-quiz { background: #1a1a1a; padding: 18px; border-radius: 5px; border-left: 3px solid #f39c12; margin-top: 10px; }
.reading-quiz h4 { color: #f39c12; margin-top: 0; margin-bottom: 15px; }
.mc-q { margin-bottom: 18px; }
.mc-q p { color: #fff; font-weight: bold; margin-bottom: 8px; font-size: 0.95rem; }
.mc-q label { display: block; padding: 7px 12px; margin-bottom: 4px; background: #252525; border-radius: 4px; cursor: pointer; font-size: 0.9rem; color: #ccc; border: 1px solid #333; transition: 0.2s; }
.mc-q label:hover { background: #2e2e2e; border-color: #555; }
.mc-q input[type="radio"] { margin-right: 8px; accent-color: #27ae60; }
.mc-fb { display: block; font-weight: bold; font-size: 0.9rem; margin-top: 4px; }
.wide-speak { font-size: 0.9rem; background: #252525; border: 1px solid #444; border-radius: 4px; padding: 5px 12px; cursor: pointer; color: #2ecc71; margin-top: 8px; filter: none; }
.wide-speak:hover { background: #2f2f2f; }

/* --- 8. CLOZE --- */
.cloze-container { background: #222; border: 1px solid #444; padding: 25px; border-radius: 8px; }
.cloze-title { color: #f39c12; margin-top: 0; }
.cloze-text { font-size: 1rem; line-height: 2.1; color: #ddd; }
.cloze-text p { margin-bottom: 15px; }
.cloze-select {
    background: #2a2a2a;
    border: 1px solid #555;
    border-bottom: 2px solid #f39c12;
    color: #fff;
    padding: 3px 8px;
    border-radius: 4px 4px 0 0;
    font-size: 0.95rem;
    cursor: pointer;
    margin: 0 4px;
    transition: 0.2s;
}
.cloze-select:focus { outline: none; border-color: #f39c12; }
.cloze-controls { display: flex; align-items: center; gap: 15px; margin-top: 20px; padding-top: 15px; border-top: 1px solid #333; flex-wrap: wrap; }
.cloze-feedback-box { background: #1a2a1a; border: 1px solid #2ecc71; padding: 15px; border-radius: 5px; margin-top: 15px; font-size: 0.9rem; color: #ccc; line-height: 1.8; }
.reset-btn { background: #333 !important; color: #aaa !important; }
.reset-btn:hover { background: #444 !important; }

/* --- 9. DRILLS --- */
.quiz-block { border: 1px solid #333; padding: 20px; border-radius: 8px; background: #252525; margin-bottom: 20px; }
.quiz-header { font-weight: bold; color: #f39c12; margin-bottom: 8px; border-bottom: 1px solid #444; padding-bottom: 5px; font-size: 1rem; }
.drill-instructions { background: #1e1e1e; padding: 9px 12px; border-radius: 4px; border-left: 3px solid #27ae60; color: #ccc; margin-bottom: 12px; font-size: 0.88rem; }
.mini-quiz-item { margin-bottom: 8px; padding: 10px; background: #222; border-radius: 4px; display: flex; align-items: center; flex-wrap: wrap; gap: 10px; border: 1px solid #333; font-size: 0.93rem; color: #ddd; }
.quiz-input { background: #333; border: 1px solid #555; color: #fff; padding: 5px 10px; border-radius: 4px; width: 180px; font-family: 'Segoe UI', sans-serif; }
.check-btn { background: #f39c12; color: #111; border: none; padding: 7px 14px; border-radius: 4px; cursor: pointer; font-weight: bold; transition: 0.2s; font-size: 0.9rem; }
.check-btn:hover { background: #d35400; color: white; }
.drill-fb { font-weight: bold; font-size: 0.88rem; }
.score-display { font-weight: bold; font-size: 1rem; color: #f39c12; }
.ex-btn { background: #333; border: 1px solid #555; color: #ccc; padding: 8px 15px; border-radius: 4px; cursor: pointer; transition: 0.2s; font-size: 0.9rem; margin-right:5px; }
.ex-btn:hover { background: #444; }

/* --- 10. RESPONSIVE --- */
@media (max-width: 600px) {
    body { padding: 12px; }
    h1 { font-size: 1.4rem; }
    .vocab-row span:first-child { width: 130px; }
    .ipa { width: 100px; }
    .g-input.wide-input { width: 100%; }
    .rule-grid { grid-template-columns: 1fr; }
    .news-img { display: none; }
}

/* --- 11. ADJECTIVE ORDER VISUAL --- */
.adj-order-visual {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin: 20px 0;
}
.adj-box {
    background: #252525;
    border: 1px solid #555;
    border-radius: 8px;
    padding: 12px 16px;
    text-align: center;
    min-width: 120px;
    flex: 1;
}
.adj-box.opinion { border-top: 3px solid #27ae60; }
.adj-box.size    { border-top: 3px solid #f39c12; }
.adj-box.origin  { border-top: 3px solid #3498db; }
.adj-box.noun-box{ border-top: 3px solid #e74c3c; }
.adj-label { font-weight: bold; color: #fff; font-size: 0.9rem; margin-bottom: 5px; }
.adj-examples { color: #aaa; font-size: 0.82rem; font-style: italic; }
.adj-arrow { color: #555; font-size: 1.4rem; font-weight: bold; flex: 0 0 auto; }
.adj-examples-block { background: #1a1a1a; padding: 15px 20px; border-radius: 6px; border: 1px solid #333; margin-top: 5px; }
.adj-examples-block p { margin: 5px 0; font-size: 0.93rem; color: #ddd; }

/* --- 12. EXAMPLE COMPARE BOXES (Timetables) --- */
.example-compare {
    display: flex;
    gap: 15px;
    align-items: stretch;
    flex-wrap: wrap;
    margin: 20px 0;
}
.example-box {
    flex: 1;
    min-width: 220px;
    background: #252525;
    border: 1px solid #444;
    border-radius: 8px;
    padding: 18px;
}
.example-box.lw-because { border-left: 4px solid #27ae60; }
.example-box.lw-so      { border-left: 4px solid #3498db; }
.example-box p { margin: 6px 0; font-size: 0.9rem; color: #ddd; }
.ex-label { font-weight: bold; color: #f39c12; font-size: 0.88rem; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.05em; }
.arrow-box { display: flex; align-items: center; justify-content: center; color: #555; font-weight: bold; font-size: 1.1rem; padding: 10px; }
/* ── FROM LESSON 20 STRUCTURE ── */
.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; }
h2 { color:#2ecc71; margin-top:0; }
.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; }
.tip-box { background:#1a2a3a; border-left:3px solid #3498db; padding:10px 14px; border-radius:0 4px 4px 0; font-size:0.88rem; color:#8cc8ff; margin-top:12px; }
.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; }
.g-hint { font-size:0.8rem; color:#888; font-style:italic; }
.score-perfect { color:#2ecc71 !important; }
.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; }
.fb-correct { color:#2ecc71; }
.fb-wrong   { color:#e74c3c; }
.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-errors { padding-left:20px; margin:8px 0 0; }
.cloze-errors li { margin-bottom:6px; }
.cloze-errors em { color:#e74c3c; }
.cloze-errors strong { color:#2ecc71; }
.q-num { color:#888; font-weight:bold; flex-shrink:0; min-width:22px; }
.q-text { color:#ddd; flex:1; min-width:200px; }
.drill-feedback { font-size:0.88rem; font-style:italic; min-width:80px; }
.lw-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:14px; }
.three-col { grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); }
.lw-card { background:#252525; border:1px solid #3a3a3a; border-radius:8px; padding:16px; }
.lw-badge { display:inline-block; font-weight:bold; font-size:1rem; padding:4px 14px; border-radius:20px; margin-bottom:10px; }
.lw-use { color:#888; font-size:0.85rem; font-style:italic; margin:0 0 10px; }
.lw-card ul { padding-left:18px; margin:0; color:#ccc; font-size:0.88rem; }
.lw-card ul li { margin-bottom:8px; line-height:1.5; }
.mini-tip { background:#1a1a1a; border-left:3px solid #f39c12; padding:6px 10px; margin-top:12px; font-size:0.82rem; color:#f39c12; border-radius:0 4px 4px 0; }
/* ── KWT TAB ── */
.kwt-item {
    background: #222;
    border: 1px solid #333;
    border-radius: 6px;
    padding: 14px 16px;
    margin-bottom: 14px;
}
.kwt-original {
    display: flex;
    gap: 10px;
    font-size: 0.95rem;
    color: #ddd;
    margin-bottom: 8px;
}
.kwt-num { color: #888; font-weight: bold; flex-shrink: 0; }
.kwt-key-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}
.kwt-key-label { font-size: 0.82rem; color: #888; text-transform: uppercase; letter-spacing: 0.5px; }
.kwt-key {
    background: #e74c3c;
    color: #fff;
    font-weight: bold;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 0.9rem;
    letter-spacing: 0.3px;
}
.kwt-input-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.95rem;
}
.kwt-stem {
    color: #aaa;
    font-style: italic;
    white-space: nowrap;
}
.kwt-input {
    background: #333;
    border: 1px solid #555;
    color: #fff;
    padding: 6px 10px;
    border-radius: 4px;
    min-width: 260px;
    flex: 1;
    font-family: 'Segoe UI', sans-serif;
    font-size: 0.93rem;
    transition: border-color 0.2s;
}
.kwt-input:focus { outline: none; border-color: #e74c3c; }
.kwt-fb { font-size: 0.88rem; font-weight: bold; white-space: nowrap; }