/* ===== 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; }

/* ===== HEADER ===== */
header { border-bottom: 2px solid #27ae60; padding-bottom: 20px; margin-bottom: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
h1 { margin: 0; font-size: 1.8rem; color: #fff; }
.header-sub { font-size: 0.9rem; color: #888; margin-top: 4px; }
.back-link { text-decoration: none; color: #888; border: 1px solid #444; padding: 5px 10px; border-radius: 4px; white-space: nowrap; }
.back-link:hover { color: #fff; border-color: #fff; }

/* ===== NAV ===== */
.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; }

/* ===== 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); } }

/* ===== HEADINGS ===== */
h2 { color: #2ecc71; margin-top: 0; border-bottom: 1px solid #444; padding-bottom: 10px; }
h3 { color: #f39c12; margin-top: 30px; border-left: 3px solid #f39c12; padding-left: 10px; margin-bottom: 10px; }
h4 { color: #2ecc71; margin: 15px 0 8px 0; }

/* ===== UTILITY BOXES ===== */
.context-note { background: #2a2a2a; padding: 15px; border-left: 3px solid #2ecc71; color: #ccc; margin-bottom: 20px; border-radius: 0 4px 4px 0; }
.rule-box { background: #1c2a38; padding: 20px; border-radius: 6px; border: 1px solid #2c4a6e; margin-bottom: 20px; border-left: 4px solid #3498db; }
.rule-box.green { background: #1a2c1a; border-color: #27ae60; border-left-color: #2ecc71; }
.rule-box.orange { background: #2c2410; border-color: #7d5a00; border-left-color: #f39c12; }
.rule-box.red { background: #2c1a1a; border-color: #7d2a2a; border-left-color: #e74c3c; }
.rule-box.purple { background: #1f1a2c; border-color: #5a3a7d; border-left-color: #9b59b6; }
.rule-box.teal { background: #1a2c2a; border-color: #2a7d6e; border-left-color: #1abc9c; }
.special-case { background: #2c3e50; border: 1px solid #34495e; padding: 15px; margin-top: 15px; border-radius: 5px; border-left: 4px solid #e74c3c; }
.section-divider { border: none; border-top: 1px dashed #444; margin: 30px 0; }

/* ===== LISTS ===== */
.clean-list { list-style: none; padding: 0; margin: 0; }
.clean-list li { padding: 8px 0; border-bottom: 1px solid #2a2a2a; }
.clean-list li:last-child { border-bottom: none; }

/* ===== IPA & SPEAK ===== */
.ipa { font-family: 'Courier New', monospace; color: #f39c12; background: #333; padding: 2px 5px; border-radius: 3px; font-size: 0.85rem; margin: 0 8px; white-space: nowrap; }
.bg { color: #aaa; font-style: italic; flex: 1; }
.speak-btn { background: none; border: none; cursor: pointer; font-size: 1.1rem; margin-left: 8px; filter: grayscale(1); transition: 0.2s; flex-shrink: 0; }
.speak-btn:hover { filter: grayscale(0); transform: scale(1.2); }

/* ===== VOCAB ===== */
.vocab-list-container { display: flex; flex-direction: column; gap: 8px; max-width: 850px; margin: 0 auto; }
.vocab-header { font-weight: bold; color: #2ecc71; margin-top: 18px; border-bottom: 1px solid #444; padding-bottom: 5px; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 1px; }
.vocab-row { display: flex; align-items: center; background: #252525; padding: 9px 15px; border-radius: 6px; border: 1px solid #333; transition: 0.2s; }
.vocab-row:hover { background: #2c3e50; border-color: #3498db; }
.vocab-row .word { font-weight: bold; width: 190px; flex-shrink: 0; font-size: 0.95rem; }

/* ===== GRAMMAR TABLES ===== */
.grammar-table { width: 100%; border-collapse: collapse; margin: 10px 0; background: #1a1a1a; border-radius: 5px; overflow: hidden; }
.grammar-table td, .grammar-table th { padding: 11px 14px; border-bottom: 1px solid #2a2a2a; vertical-align: top; }
.grammar-table th { background: #111; color: #2ecc71; text-align: left; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.5px; }
.grammar-table tr:last-child td { border-bottom: none; }
.grammar-table .wrong-col { color: #e74c3c; }
.grammar-table .right-col { color: #2ecc71; }

/* ===== TWO-COLUMN GRID ===== */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

/* ===== FORMULA DISPLAY ===== */
.formula-box { background: #111; border: 1px solid #27ae60; border-radius: 5px; padding: 10px 15px; font-family: 'Courier New', monospace; color: #2ecc71; margin: 10px 0; font-size: 0.95rem; }
.formula-box span { color: #f39c12; }

/* ===== INLINE GRAMMAR EXERCISES ===== */
.gram-exercise { background: #141e1a; border: 1px solid #27ae60; border-radius: 6px; padding: 18px 20px; margin-top: 18px; }
.gram-exercise-title { font-weight: bold; color: #2ecc71; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; border-bottom: 1px solid #27ae60; padding-bottom: 6px; }
.gram-q { background: #1e1e1e; border: 1px solid #333; border-radius: 5px; padding: 10px 14px; margin-bottom: 8px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 0.93rem; }
.gram-q-text { flex: 1; min-width: 180px; }
.gram-opts { display: flex; flex-wrap: wrap; gap: 6px; }
.gram-btn { background: #2a2a2a; border: 1px solid #444; color: #ccc; padding: 6px 14px; border-radius: 4px; cursor: pointer; font-size: 0.88rem; transition: 0.2s; }
.gram-btn:hover:not(:disabled) { background: #3a3a3a; }
.gram-btn.g-correct { background: #1a5c2a !important; border-color: #2ecc71 !important; color: #2ecc71 !important; font-weight: bold; }
.gram-btn.g-wrong { background: #5c1a1a !important; border-color: #e74c3c !important; color: #e74c3c !important; }
.gram-feedback { font-size: 0.85rem; margin-top: 5px; padding: 5px 10px; border-radius: 4px; display: none; }
.gram-feedback.show { display: block; }
.gram-feedback.fb-ok { color: #2ecc71; background: #1a2c1a; }
.gram-feedback.fb-no { color: #e74c3c; background: #2c1a1a; }

/* ===== DRILLS TAB ===== */
#drills-scroll-area { display: flex; flex-direction: column; gap: 20px; }
.quiz-block { border: 1px solid #2a2a2a; padding: 20px; border-radius: 8px; background: #1c1c1c; }
.quiz-header { font-weight: bold; color: #f39c12; margin-bottom: 12px; border-bottom: 1px solid #333; padding-bottom: 6px; font-size: 1rem; }
.mini-quiz-item { margin-bottom: 10px; padding: 10px 12px; background: #181818; border-radius: 5px; display: flex; align-items: center; flex-wrap: wrap; gap: 8px; border: 1px solid #2a2a2a; font-size: 0.93rem; }
.quiz-input { background: #2a2a2a; border: 1px solid #555; color: #fff; padding: 5px 10px; border-radius: 4px; width: 130px; font-family: 'Segoe UI', sans-serif; font-size: 0.9rem; }
.check-btn { background: #f39c12; color: #000; border: none; padding: 7px 14px; border-radius: 4px; cursor: pointer; font-weight: bold; transition: 0.2s; font-size: 0.88rem; }
.check-btn:hover { background: #d68910; }
.ex-btn { background: #2a2a2a; border: 1px solid #444; color: #ccc; padding: 7px 14px; border-radius: 4px; cursor: pointer; transition: 0.2s; font-size: 0.88rem; }
.ex-btn:hover:not(:disabled) { background: #3a3a3a; }
.feedback-icon { font-weight: bold; font-size: 1.1rem; }
.party-options { display: flex; flex-wrap: wrap; gap: 5px; }

/* ===== IRL / READING ===== */
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.guide-card { border-radius: 8px; padding: 20px; }
.guide-card h3 { margin-top: 0; border: none; padding: 0; }
.guide-card.nhs { background: #1a2c1a; border: 2px solid #2ecc71; }
.guide-card.blue { background: #1a1f2c; border: 2px solid #3498db; }
.guide-card.danger { background: #2c1a1a; border: 2px solid #e74c3c; }
.guide-card.advice { background: #2c2410; border: 2px solid #f39c12; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 12px; font-size: 0.78rem; font-weight: bold; margin-left: 5px; }
.badge.free { background: #2ecc71; color: #000; }
.badge.pay { background: #e74c3c; color: #fff; }

.reading-card { background: #1a2535; border: 1px solid #2c4a6e; border-radius: 8px; padding: 25px; margin-bottom: 25px; }
.story-label { font-size: 0.78rem; color: #888; margin-bottom: 5px; text-transform: uppercase; letter-spacing: 1px; }
.story-title { font-size: 1.2rem; font-weight: bold; color: #3498db; margin-bottom: 15px; }
.story-text { background: #111; border-radius: 6px; padding: 20px; line-height: 1.95; color: #ddd; margin-bottom: 20px; border-left: 3px solid #3498db; }
.story-text strong { color: #f39c12; }
.rq-item { background: #1e1e1e; border-radius: 6px; padding: 12px 15px; margin-bottom: 10px; border: 1px solid #2a2a2a; }
.rq-item p { margin: 0 0 8px 0; font-weight: bold; }
.rq-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.rq-btn { background: #2a2a2a; border: 1px solid #444; color: #ccc; padding: 7px 14px; border-radius: 4px; cursor: pointer; font-size: 0.88rem; transition: 0.2s; }
.rq-btn:hover:not(:disabled) { background: #3a3a3a; }
.rq-btn.correct { background: #1a5c2a !important; border-color: #2ecc71 !important; color: #2ecc71 !important; font-weight: bold; }
.rq-btn.wrong { background: #5c1a1a !important; border-color: #e74c3c !important; color: #e74c3c !important; }
.rq-result { margin-top: 8px; font-size: 0.88rem; display: none; padding: 6px 10px; border-radius: 4px; }
.rq-result.show { display: block; }
.rq-result.ok { color: #2ecc71; background: #1a2c1a; }
.rq-result.no { color: #e74c3c; background: #2c1a1a; }

/* ===== RESPONSIVE ===== */
@media (max-width: 680px) {
    .two-col { grid-template-columns: 1fr; }
    .guide-grid { grid-template-columns: 1fr; }
    .vocab-row .word { width: 140px; }
}