/* ==========================================================================
   RUSCA.ORG LESSON & PRACTICE (ALISTIRMALAR) CLEAN SYSTEM
   ========================================================================== */
:root {
    --rc-primary: #1a237e;
    --rc-primary-dark: #0f172a;
    --rc-primary-light: #283593;
    --rc-surface: #ffffff;
    --rc-bg: #f8fafc;
    --rc-border: #e2e8f0;
    --rc-border-focus: #94a3b8;
    --rc-text-main: #1e293b;
    --rc-text-muted: #64748b;
    --rc-accent-green: #16a34a;
    --rc-accent-amber: #d97706;
    --rc-accent-red: #dc2626;
    --rc-card-radius: 16px;
    --rc-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --rc-shadow-md: 0 4px 14px rgba(15, 23, 42, 0.06);
}

body {
    background-color: var(--rc-bg);
    color: var(--rc-text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body.dark-mode {
    --rc-surface: #161a36;
    --rc-bg: #0b0f24;
    --rc-border: #242b54;
    --rc-border-focus: #3949ab;
    --rc-text-main: #f1f5f9;
    --rc-text-muted: #94a3b8;
    background-color: var(--rc-bg) !important;
}

/* ── Breadcrumb ── */
.rc-lesson-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.86rem;
    color: var(--rc-text-muted);
    flex-wrap: wrap;
}
.rc-lesson-breadcrumb a {
    color: var(--rc-text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}
.rc-lesson-breadcrumb a:hover {
    color: var(--rc-primary);
}
body.dark-mode .rc-lesson-breadcrumb a:hover {
    color: #9fa8da;
}
.rc-bc-sep {
    color: #cbd5e1;
    font-size: 0.75rem;
}
body.dark-mode .rc-bc-sep {
    color: #475569;
}
.rc-bc-curr {
    color: var(--rc-text-main);
    font-weight: 600;
}

/* ── Sol Kolon: Ders Kartı ── */
.rc-lesson-main-card {
    background: var(--rc-surface);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-card-radius);
    padding: 28px;
    box-shadow: var(--rc-shadow-sm);
    margin-bottom: 24px;
    transition: border-color 0.2s ease;
}

.rc-lesson-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--rc-border);
}

.rc-lesson-title {
    font-size: 1.65rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--rc-text-main);
    margin: 0;
    line-height: 1.3;
}

.rc-lesson-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.rc-lesson-fav-btn,
.rc-lesson-speak-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--rc-border);
    background: var(--rc-surface);
    color: #94a3b8;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    cursor: pointer;
    transition: all 0.18s ease;
    flex-shrink: 0;
    padding: 0;
    text-decoration: none !important;
}
.rc-lesson-fav-btn:hover {
    background: #fee2e2;
    border-color: #fca5a5;
    color: #dc2626;
    transform: scale(1.05);
}
.rc-lesson-speak-btn:hover {
    background: #eef2ff;
    border-color: #c7d2fe;
    color: #4f46e5;
    transform: scale(1.05);
}
.rc-lesson-speak-btn.speaking {
    background: #4f46e5;
    border-color: #4338ca;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
    animation: rcPulseAudio 1.5s infinite;
}
@keyframes rcPulseAudio {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.5); }
    50% { transform: scale(1.04); box-shadow: 0 0 0 8px rgba(79, 70, 229, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(79, 70, 229, 0); }
}
body.dark-mode .rc-lesson-fav-btn,
body.dark-mode .rc-lesson-speak-btn {
    background: #121630;
    border-color: #242b54;
    color: #94a3b8;
}
body.dark-mode .rc-lesson-fav-btn:hover {
    background: #2e1010;
    border-color: #ef4444;
    color: #ef4444;
}
body.dark-mode .rc-lesson-speak-btn:hover {
    background: #1e2448;
    border-color: #4f46e5;
    color: #818cf8;
}
body.dark-mode .rc-lesson-speak-btn.speaking {
    background: #4f46e5;
    border-color: #6366f1;
    color: #ffffff;
}

.rc-lesson-meta-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}
.rc-pill-badge {
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 4px 10px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.rc-pill-badge.cat {
    background: rgba(26, 35, 126, 0.07);
    color: var(--rc-primary);
    border: 1px solid rgba(26, 35, 126, 0.15);
}
body.dark-mode .rc-pill-badge.cat {
    background: rgba(129, 140, 248, 0.15);
    color: #c7d2fe;
    border-color: rgba(129, 140, 248, 0.25);
}
.rc-pill-badge.beginner {
    background: rgba(22, 163, 74, 0.09);
    color: #16a34a;
    border: 1px solid rgba(22, 163, 74, 0.2);
}
.rc-pill-badge.intermediate {
    background: rgba(217, 119, 6, 0.09);
    color: #d97706;
    border: 1px solid rgba(217, 119, 6, 0.2);
}
.rc-pill-badge.advanced {
    background: rgba(220, 38, 38, 0.09);
    color: #dc2626;
    border: 1px solid rgba(220, 38, 38, 0.2);
}
.rc-pill-badge.duration {
    background: var(--rc-bg);
    color: var(--rc-text-muted);
    border: 1px solid var(--rc-border);
}

/* ── Kelime Çeviri Tooltip Sistemi ── */
.rc-tooltip-hint {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.83rem;
    color: #4338ca;
    background: #eef2ff;
    border: 1px solid #e0e7ff;
    border-radius: 9px;
    padding: 9px 14px;
    margin-bottom: 18px;
}
body.dark-mode .rc-tooltip-hint {
    background: rgba(99, 102, 241, 0.12);
    border-color: rgba(99, 102, 241, 0.25);
    color: #c7d2fe;
}
.ru-word {
    position: relative;
    display: inline;
    cursor: pointer;
    border-bottom: 1.5px dashed #6366f1;
    color: inherit;
    transition: all 0.15s ease;
    padding: 0 1px;
}
.ru-word:hover,
.ru-word.tapped {
    color: #4338ca;
    background: rgba(99, 102, 241, 0.08);
    border-bottom-color: #4338ca;
    border-radius: 3px;
}
body.dark-mode .ru-word {
    border-bottom-color: #818cf8;
}
body.dark-mode .ru-word:hover,
body.dark-mode .ru-word.tapped {
    color: #a5b4fc;
    background: rgba(129, 140, 248, 0.15);
    border-bottom-color: #a5b4fc;
}

.ru-tooltip {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: calc(100% + 7px);
    left: 50%;
    transform: translateX(-50%);
    background: #0f172a;
    color: #ffffff;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 8px;
    white-space: nowrap;
    pointer-events: auto;
    z-index: 9999;
    transition: opacity 0.15s ease, transform 0.15s ease;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.ru-tooltip-save-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.18);
    color: #fde047;
    cursor: pointer;
    font-size: 0.72rem;
    transition: all 0.15s ease;
}
.ru-tooltip-save-btn:hover {
    background: #fde047;
    color: #0f172a;
    transform: scale(1.15);
}
.ru-tooltip-save-btn.saved {
    background: #10b981;
    color: #ffffff;
}
.ru-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: #0f172a;
}
.ru-tooltip.pin-left { left: 0; transform: none; }
.ru-tooltip.pin-left::after { left: 14px; transform: none; }
.ru-tooltip.pin-right { left: auto; right: 0; transform: none; }
.ru-tooltip.pin-right::after { left: auto; right: 14px; transform: none; }

.ru-word:hover .ru-tooltip,
.ru-word.tapped .ru-tooltip {
    visibility: visible;
    opacity: 1;
}

/* ── Ders Metni / Okuma / Gramer Alanı ── */
.rc-lesson-story-box {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 12px;
    padding: 22px 24px;
    font-size: 1.04rem;
    line-height: 1.75;
    color: var(--rc-text-main);
    margin-bottom: 22px;
}
body.dark-mode .rc-lesson-story-box {
    background: #11142e;
}

/* Konuşma Diyalog Balonları */
.speech-bubbles-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}
.speech-bubble {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 0.98rem;
    line-height: 1.6;
}
body.dark-mode .speech-bubble {
    background: #121630;
    border-color: #242b54;
}

/* Ses ve Video Oynatıcı */
.rc-audio-box {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.rc-audio-box audio {
    width: 100%;
    max-width: 440px;
    outline: none;
}
.responsive-video {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid var(--rc-border);
    margin-bottom: 20px;
}
.responsive-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.rc-lesson-desc-lead {
    font-size: 0.95rem;
    color: var(--rc-text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
}

/* AI ile Pratik CTA Banner */
.rc-ai-practice-box {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
body.dark-mode .rc-ai-practice-box {
    background: #121630;
    border-color: #242b54;
}
.rc-ai-title {
    font-size: 0.94rem;
    font-weight: 700;
    color: var(--rc-text-main);
    display: flex;
    align-items: center;
    gap: 7px;
}
.rc-ai-sub {
    font-size: 0.82rem;
    color: var(--rc-text-muted);
    margin-top: 2px;
}
.rc-btn-ai-cta {
    background: var(--rc-primary);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 0.86rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}
.rc-btn-ai-cta:hover {
    background: var(--rc-primary-light);
    color: #ffffff;
    transform: translateY(-1px);
}

/* Ders Navigasyonu */
.rc-lesson-nav-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    padding-top: 20px;
    border-top: 1px solid var(--rc-border);
}
.rc-nav-card {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 10px;
    padding: 12px 16px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.15s ease;
}
.rc-nav-card:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
    transform: translateY(-1px);
}
body.dark-mode .rc-nav-card {
    background: #11142e;
    border-color: #242b54;
}
body.dark-mode .rc-nav-card:hover {
    background: #1e2448;
    border-color: #3949ab;
}
.rc-nav-card.next {
    justify-content: flex-end;
    text-align: right;
}
.rc-nav-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--rc-text-muted);
}
.rc-nav-title {
    font-size: 0.90rem;
    font-weight: 700;
    color: var(--rc-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 220px;
}
body.dark-mode .rc-nav-title {
    color: #a5b4fc;
}

/* ==========================================================================
   SAĞ KOLON: PRATİK / ALIŞTIRMALAR MODÜLÜ
   ========================================================================== */
.rc-practice-card {
    background: var(--rc-surface);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-card-radius);
    padding: 24px;
    box-shadow: var(--rc-shadow-sm);
    position: relative;
    margin-bottom: 24px;
}

.rc-practice-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--rc-border);
}
.rc-practice-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--rc-text-main);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.rc-practice-title i {
    color: var(--rc-primary);
}
body.dark-mode .rc-practice-title i {
    color: #9fa8da;
}
.rc-practice-count-badge {
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    color: var(--rc-text-muted);
    padding: 3px 8px;
    border-radius: 6px;
}

/* Her Bir Soru Bloğu */
.rc-exercise-block {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    transition: border-color 0.15s ease;
}
body.dark-mode .rc-exercise-block {
    background: #11142e;
    border-color: #242b54;
}
.rc-exercise-header {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 12px;
}
.rc-exercise-num {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: var(--rc-primary);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 1px;
}
body.dark-mode .rc-exercise-num {
    background: #3949ab;
}
.rc-exercise-qtext {
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--rc-text-main);
    line-height: 1.45;
}

/* Şık Çoktan Seçmeli Seçenekler */
.rc-quiz-choices {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.rc-quiz-choice {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--rc-surface);
    border: 1px solid var(--rc-border);
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    margin: 0;
    position: relative;
}
.rc-quiz-choice:hover {
    border-color: #94a3b8;
    background: #f1f5f9;
}
body.dark-mode .rc-quiz-choice {
    background: #161a36;
    border-color: #242b54;
}
body.dark-mode .rc-quiz-choice:hover {
    background: #1e2448;
    border-color: #3949ab;
}

.rc-quiz-choice input[type="radio"] {
    display: none;
}
.rc-quiz-radio-custom {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid #cbd5e1;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.15s ease;
}
body.dark-mode .rc-quiz-radio-custom {
    border-color: #475569;
}
.rc-quiz-choice input[type="radio"]:checked + .rc-quiz-radio-custom {
    border-color: var(--rc-primary);
    background: var(--rc-primary);
    box-shadow: inset 0 0 0 3px #ffffff;
}
body.dark-mode .rc-quiz-choice input[type="radio"]:checked + .rc-quiz-radio-custom {
    border-color: #818cf8;
    background: #818cf8;
    box-shadow: inset 0 0 0 3px #161a36;
}
.rc-quiz-choice input[type="radio"]:checked ~ .rc-quiz-label-text {
    color: var(--rc-primary);
    font-weight: 700;
}
body.dark-mode .rc-quiz-choice input[type="radio"]:checked ~ .rc-quiz-label-text {
    color: #c7d2fe;
}
.rc-quiz-choice.selected-choice {
    border-color: var(--rc-primary);
    background: rgba(26, 35, 126, 0.04);
}
body.dark-mode .rc-quiz-choice.selected-choice {
    border-color: #3949ab;
    background: rgba(57, 73, 171, 0.15);
}

.rc-quiz-label-text {
    font-size: 0.90rem;
    color: var(--rc-text-main);
    line-height: 1.35;
    flex: 1;
}

/* Kontrol Butonu */
.rc-btn-check-answers {
    width: 100%;
    background: var(--rc-primary);
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    padding: 12px 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(26, 35, 126, 0.2);
    transition: all 0.15s ease;
    margin-top: 8px;
}
.rc-btn-check-answers:hover {
    background: var(--rc-primary-light);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(26, 35, 126, 0.3);
}

/* ── Alıştırma Sonuç Kartı (Sade & Profesyonel) ── */
.rc-result-panel {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--rc-border);
    background: var(--rc-surface);
    margin-top: 18px;
    box-shadow: var(--rc-shadow-sm);
}
.rc-result-summary {
    padding: 16px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    background: #f8fafc;
    border-bottom: 1px solid var(--rc-border);
}
body.dark-mode .rc-result-summary {
    background: #121630;
}
.rc-result-pct-badge {
    font-size: 1.15rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.rc-result-pct-badge.success {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #bbf7d0;
}
body.dark-mode .rc-result-pct-badge.success {
    background: rgba(34, 197, 94, 0.2);
    color: #86efac;
    border-color: rgba(34, 197, 94, 0.35);
}
.rc-result-pct-badge.warning {
    background: #fef3c7;
    color: #b45309;
    border: 1px solid #fde68a;
}
body.dark-mode .rc-result-pct-badge.warning {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
    border-color: rgba(245, 158, 11, 0.35);
}
.rc-result-counts {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.86rem;
    font-weight: 600;
}
.rc-result-counts .cnt-correct { color: #16a34a; }
.rc-result-counts .cnt-wrong { color: #dc2626; }

.rc-result-items-list {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.rc-result-item-card {
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: 8px;
    padding: 12px 14px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
body.dark-mode .rc-result-item-card {
    background: #11142e;
}
.rc-result-item-card.is-correct {
    border-left: 4px solid #16a34a;
}
.rc-result-item-card.is-wrong {
    border-left: 4px solid #dc2626;
}
.rc-result-item-q {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--rc-text-main);
    margin-bottom: 4px;
}
.rc-result-item-ans {
    font-size: 0.82rem;
    color: var(--rc-text-muted);
    line-height: 1.4;
}
.rc-result-item-badge {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 7px;
    border-radius: 4px;
    flex-shrink: 0;
}
.rc-result-item-badge.correct {
    background: #dcfce7;
    color: #15803d;
}
.rc-result-item-badge.wrong {
    background: #fee2e2;
    color: #b91c1c;
}

/* Giriş Yapmamış Ziyaretçiler İçin Sade Kilit Ekranı */
.rc-guest-lock-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(4px);
    border-radius: var(--rc-card-radius);
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 28px;
}
body.dark-mode .rc-guest-lock-overlay {
    background: rgba(18, 22, 48, 0.96);
}
.rc-guest-lock-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(26, 35, 126, 0.08);
    color: var(--rc-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 14px;
}
body.dark-mode .rc-guest-lock-icon {
    background: rgba(129, 140, 248, 0.15);
    color: #818cf8;
}
.rc-guest-lock-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--rc-text-main);
    margin-bottom: 8px;
}
.rc-guest-lock-desc {
    font-size: 0.88rem;
    color: var(--rc-text-muted);
    max-width: 320px;
    margin-bottom: 18px;
    line-height: 1.5;
}
.rc-guest-lock-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    max-width: 280px;
}
.rc-guest-btn-login {
    flex: 1;
    background: var(--rc-primary);
    color: #ffffff;
    font-size: 0.88rem;
    font-weight: 600;
    padding: 9px;
    border-radius: 8px;
    text-decoration: none;
    text-align: center;
}
.rc-guest-btn-register {
    flex: 1;
    background: transparent;
    border: 1px solid var(--rc-border);
    color: var(--rc-text-main);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 9px;
    border-radius: 8px;
    text-decoration: none;
    text-align: center;
}

/* Kutlama Toast (Sade & Modern) */
.rc-celebrate-toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: #0f172a;
    color: #ffffff;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.25);
    text-align: center;
    z-index: 99998;
    opacity: 0;
    transition: opacity .25s ease, transform .25s ease;
    min-width: 240px;
    border: 1px solid rgba(255,255,255,0.1);
}
.rc-celebrate-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
.rc-celebrate-icon { font-size: 1.8rem; line-height: 1; margin-bottom: 4px; }
.rc-celebrate-title { font-weight: 700; font-size: 1.05rem; }
.rc-celebrate-sub { font-size: .84rem; opacity: .85; margin-top: 2px; }
.rc-celebrate-xp { font-weight: 800; font-size: 1.15rem; margin-top: 6px; color: #fbbf24; }

@media (max-width: 768px) {
    .rc-lesson-main-card,
    .rc-practice-card {
        padding: 20px 16px;
    }
    .rc-lesson-title {
        font-size: 1.35rem;
    }
    .rc-lesson-nav-grid {
        grid-template-columns: 1fr;
    }
    .rc-nav-card.next {
        justify-content: flex-start;
        text-align: left;
    }
}

/* ── Ders Sonu Telegram Kartı ── */
.rc-lesson-tg-card {
    position: relative;
    background: linear-gradient(135deg, #0d1e3d 0%, #152952 50%, #102144 100%);
    border: 1px solid rgba(42, 171, 238, 0.4);
    border-radius: var(--rc-card-radius);
    padding: 24px 26px;
    margin-top: 24px;
    color: #ffffff;
    box-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.25), 0 0 20px rgba(34, 158, 217, 0.12);
    overflow: hidden;
}
body.dark-mode .rc-lesson-tg-card {
    background: linear-gradient(135deg, #091326 0%, #0f1d3b 50%, #0b1730 100%);
    border-color: rgba(42, 171, 238, 0.3);
}
.rc-lesson-tg-glow {
    position: absolute;
    top: -40px;
    right: -40px;
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, rgba(34, 158, 217, 0.3) 0%, rgba(34, 158, 217, 0) 70%);
    pointer-events: none;
    border-radius: 50%;
}
.rc-lesson-tg-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.rc-lesson-tg-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(34, 158, 217, 0.18);
    border: 1px solid rgba(34, 158, 217, 0.45);
    color: #38bdf8;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 3px 9px;
    border-radius: 12px;
    text-transform: uppercase;
}
.rc-lesson-tg-dot {
    width: 7px;
    height: 7px;
    background: #22d3ee;
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.7);
    animation: rcPulse 1.8s infinite;
}
.rc-lesson-tg-free-pill {
    font-size: 0.74rem;
    color: #4ade80;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
}
.rc-lesson-tg-body {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
}
.rc-lesson-tg-icon-circle {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: linear-gradient(135deg, #2AABEE 0%, #229ED9 100%);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    box-shadow: 0 4px 14px rgba(34, 158, 217, 0.4);
}
.rc-lesson-tg-info {
    flex: 1;
}
.rc-lesson-tg-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    margin: 0 0 6px;
    line-height: 1.35;
}
.rc-lesson-tg-desc {
    font-size: 0.86rem;
    color: #a5b4fc;
    line-height: 1.5;
    margin: 0;
}
.rc-lesson-tg-desc strong {
    color: #ffffff;
}
.rc-lesson-tg-action-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.rc-lesson-tg-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2AABEE 0%, #229ED9 100%);
    color: #ffffff !important;
    font-size: 0.92rem;
    font-weight: 700;
    padding: 11px 22px;
    border-radius: 10px;
    text-decoration: none !important;
    box-shadow: 0 6px 18px rgba(34, 158, 217, 0.35);
    transition: all 0.2s ease;
}
.rc-lesson-tg-btn:hover {
    background: linear-gradient(135deg, #38bdf8 0%, #2AABEE 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 22px rgba(34, 158, 217, 0.5);
    color: #ffffff !important;
}
.rc-lesson-tg-note {
    font-size: 0.78rem;
    color: #94a3b8;
}
@media (max-width: 576px) {
    .rc-lesson-tg-body {
        flex-direction: column;
        gap: 12px;
    }
    .rc-lesson-tg-action-row {
        flex-direction: column;
        align-items: stretch;
    }
    .rc-lesson-tg-btn {
        width: 100%;
    }
    .rc-lesson-tg-note {
        text-align: center;
    }
}