/* ═══════════════════════════════════════════════════════════
   V7.2 HYBRID LESSON - SANDBOX CSS
   EduHasitha Platform | Matches V6 Light Theme Design
   ═══════════════════════════════════════════════════════════ */

:root {
    --primary-color: #0891b2;
    --primary-color-dark: #0e7490;
    --primary-color-light: #ecfeff;
    --text-color-dark: #1e293b;
    --text-color: #334155;
    --text-color-light: #64748b;
    --bg-color: #f0f9ff;
    --card-bg-color: #ffffff;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --shadow-color: rgba(8, 145, 178, 0.1);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideInUp { from { transform: translateY(40px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes starPop { 0% { transform: scale(1); } 50% { transform: scale(1.3); } 100% { transform: scale(1); } }

* { box-sizing: border-box; }

body.v72-hybrid-env {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans Sinhala', 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.8;
}

/* ─── Page Container ─── */
.page-container {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    min-height: 100vh;
    padding: 24px 16px;
}

/* ─── Header ─── */
.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    margin-bottom: 24px;
    animation: fadeIn 0.5s ease-out;
}

.lesson-title span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color-light);
}

.lesson-title h1 {
    font-size: 26px;
    font-weight: 800;
    color: var(--primary-color-dark);
    margin: 0;
    line-height: 1.2;
}

.back-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color-dark);
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg-color);
    white-space: nowrap;
}

.back-link:hover {
    background-color: var(--primary-color-light);
    transform: scale(1.05);
}

.back-link svg {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    transition: transform 0.3s;
}

.back-link:hover svg {
    transform: translateX(-3px);
}

/* ─── Progress Bar ─── */
.progress-section {
    background-color: var(--card-bg-color);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 40px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px var(--shadow-color);
    animation: slideInUp 0.6s ease-out;
}

.progress-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color-dark);
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
}

.progress-label span:last-child {
    color: var(--primary-color);
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #67e8f9, var(--primary-color));
    border-radius: 6px;
    transition: width 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

/* ─── Concept Cards ─── */
.concepts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.animated-card {
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transform: translateY(30px);
}

.animated-card.in-view {
    opacity: 1;
    transform: translateY(0);
}

.concept-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: transform 0.3s, box-shadow 0.3s;
    overflow: hidden;
}

.concept-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 25px var(--shadow-color);
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--primary-color-light);
}

.card-header h2 {
    font-size: 20px;
    font-weight: 700;
    margin: 0;
    color: var(--primary-color-dark);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-icon {
    margin-right: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 800;
}

.completion-star {
    font-size: 24px;
    color: #d1d5db;
    transition: color 0.3s, transform 0.3s;
}

.completion-star.earned {
    color: #facc15;
    transform: scale(1.1);
    animation: starPop 0.4s ease-out;
}

.card-body {
    padding: 24px;
}

.card-body p {
    margin: 0 0 16px 0;
    font-size: 15.5px;
    color: var(--text-color-dark);
}

/* ─── Formula Box ─── */
.formula-box {
    background-color: var(--primary-color-light);
    border: 2px dashed rgba(8, 145, 178, 0.3);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    margin: 20px 0;
}

.formula-box h3 {
    margin: 0 0 8px 0;
    font-size: 14px;
    color: var(--primary-color-dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.formula-display {
    font-size: 1.6rem !important;
    font-weight: 700 !important;
    color: var(--text-color-dark) !important;
    margin: 0 !important;
}

/* ─── Interactive Questions ─── */
.interactive-example {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px dashed var(--border-color);
}

.interactive-example:first-of-type {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.question {
    font-weight: 600;
    color: var(--text-color-dark) !important;
    margin-bottom: 12px !important;
    font-size: 15px;
}

.options-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.option-btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background-color: var(--card-bg-color);
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-family: inherit;
    font-size: 0.95rem;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background-color: var(--primary-color-light);
    transform: translateY(-2px);
}

.option-btn.correct {
    background-color: #dcfce7 !important;
    border-color: #10b981 !important;
    color: #10b981 !important;
}

.option-btn.incorrect {
    background-color: #fee2e2 !important;
    border-color: #ef4444 !important;
    color: #ef4444 !important;
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.feedback-message {
    margin-top: 12px;
    font-size: 14px;
    font-weight: 500;
    min-height: 20px;
    padding: 5px;
    border-radius: 5px;
}

.feedback-message.success {
    color: #059669;
    background-color: #ecfdf5;
}

.feedback-message.error {
    color: #dc2626;
    background-color: #fef2f2;
}

/* ─── Summary Card ─── */
.summary-card {
    border-left: 4px solid var(--success-color) !important;
}

.summary-card .card-header {
    background-color: #ecfdf5;
}

.summary-card .card-header h2 {
    color: #059669;
}

.summary-card ul {
    list-style: none;
    padding: 0;
}

.summary-card li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--text-color-dark);
}


.completion-status {
    margin-top: 20px;
    padding: 16px;
    background: var(--primary-color-light);
    border-radius: 12px;
    text-align: center;
    color: var(--text-color-light);
    font-size: 14px;
    border: 1px dashed var(--border-color);
}

/* ─── Diagram Injection Zone (V7.2 Hybrid Body Content) ─── */
.diagram-injection-zone {
    background-color: var(--primary-color-light);
    border-radius: 12px;
    padding: 20px;
}

.diagram-injection-zone p {
    color: var(--text-color-light);
    font-size: 13px;
    text-align: center;
}

.diagram-injection-zone svg {
    display: block;
    margin: 0 auto;
}

/* ─── MathJax ─── */
mjx-container {
    color: var(--text-color-dark) !important;
    font-size: 1.05em !important;
}

/* ─── Example Text ─── */
.example-text {
    font-style: italic;
    color: var(--text-color);
    border-left: 3px solid var(--primary-color);
    padding-left: 10px;
    font-weight: 500;
}

/* ─── Star Earned Card ─── */
.concept-card.star-earned {
    border-left: 4px solid var(--success-color);
}

/* ─── Animation Wrappers (GSAP) ─── */
@keyframes levelUpPop { 0% { transform: scale(0) rotate(-180deg); opacity: 0; } 50% { transform: scale(1.2) rotate(10deg); } 100% { transform: scale(1) rotate(0deg); opacity: 1; } }
@keyframes starPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.3); } }
@keyframes pulse-effect { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.15); } }

.animation-wrapper {
    background-color: var(--primary-color-light);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
}

.animation-container {
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    color: var(--primary-color-dark);
    min-height: 250px;
    position: relative;
}

.step-box {
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    opacity: 0;
    transform: translateY(20px);
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    font-size: clamp(1.5rem, 5vw, 2.2rem);
    text-align: center;
}

.step-box.visible {
    opacity: 1;
    transform: translateY(0);
}

.anim-btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.anim-btn:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
}

.explanation {
    text-align: center;
    color: var(--primary-color-dark);
    font-weight: 700;
    min-height: 2.5em;
}

/* ─── Confetti Canvas ─── */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
    display: none;
}

/* ─── Level Up Modal ─── */
#level-up-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0,0,0,0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

#level-up-modal.visible {
    opacity: 1;
    visibility: visible;
}

.level-up-content {
    background-color: white;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    max-width: 380px;
    width: 90%;
    text-align: center;
    animation: levelUpPop 0.6s ease-out forwards;
    padding: 24px;
}

.level-up-card {
    border-radius: 16px;
    padding: 24px;
    color: white;
}

.level-up-card .emoji { font-size: 56px; margin-bottom: 16px; }
.level-up-card h3 { font-size: 28px; font-weight: 800; margin: 0 0 8px 0; }

.level-up-stars {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 16px;
    font-size: 28px;
}

.level-up-stars .star { color: rgba(255, 255, 255, 0.3); }
.level-up-stars .star.filled { color: #fde047; animation: starPulse 0.5s ease-in-out; }

.level-up-card .level-name { font-size: 32px; font-weight: 800; margin-bottom: 8px; }
.level-up-card .level-message { font-size: 16px; opacity: 0.9; }

.gradient-genius { background-image: linear-gradient(to right, #fca5a5, #ef4444); }
.gradient-expert { background-image: linear-gradient(to right, #c084fc, #f472b6); }
.gradient-scholar { background-image: linear-gradient(to right, #60a5fa, #38bdf8); }
.gradient-learner { background-image: linear-gradient(to right, #4ade80, #22c55e); }
.gradient-beginner { background-image: linear-gradient(to right, #9ca3af, #6b7280); }

/* ─── Achievement Badges ─── */
.achievement-badges {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 15px;
}

.badge {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.badge::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-color-dark);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 12px;
    font-family: 'Poppins', 'Noto Sans Sinhala', sans-serif;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 10;
}

.badge:hover::after { opacity: 1; }
.badge.earned { background: linear-gradient(135deg, #fbbf24, #f59e0b); box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3); transform: scale(1.1); color: white; }
.badge.locked { background: #e5e5e5; color: #a1a1aa; opacity: 0.7; }

/* ─── Next Lesson Button ─── */
.next-lesson-btn {
    display: none;
    width: fit-content;
    margin: 20px auto 0 auto;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.next-lesson-btn:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* ─── Summary Icon ─── */
.summary-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--success-color);
    margin-top: 4px;
}

.card-icon-svg {
    margin-right: 12px;
    width: 24px;
    height: 24px;
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
    .lesson-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .lesson-title h1 {
        font-size: 22px;
    }

    .options-container {
        flex-direction: column;
    }

    .option-btn {
        width: 100%;
    }
}