/* ============================================
   INDEX.HTML - ENHANCED STYLES
   Modern, Clean, Professional Design
   ============================================ */

/* ===== GLOBAL ENHANCEMENTS ===== */
body {
    font-family: 'Inter', sans-serif;
    color: #1e293b;
    overflow-x: hidden;
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* ===== HERO SECTION ===== */
.hero-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 1;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    animation: fadeInDown 0.6s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    color: #fff;
    animation: fadeInUp 0.8s ease-out;
}

.text-gradient {
    background: linear-gradient(135deg, #60a5fa 0%, #34d399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    animation: fadeInUp 1s ease-out;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: #60a5fa;
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0.5rem;
}

/* ===== BUTTONS ===== */
.btn {
    font-weight: 600;
    padding: 0.875rem 2rem;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, #1a4b84 0%, #0f3054 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(26, 75, 132, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 75, 132, 0.4);
}

.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    background: transparent;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

/* ===== SECTIONS ===== */
.section-padding {
    padding: 5rem 0;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    color: #1a4b84;
}

.section-title {
    font-size: 2.75rem;
    font-weight: 800;
    color: #0f172a;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #64748b;
    line-height: 1.7;
}

/* ===== FEATURE CARDS ===== */
.feature-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid #f1f5f9;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #1a4b84, #10b981);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.1);
    border-color: #1a4b84;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.feature-icon::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover .feature-icon::after {
    opacity: 1;
}

.bg-primary { background: linear-gradient(135deg, #1a4b84 0%, #0f3054 100%); }
.bg-success { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.bg-warning { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.bg-danger { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.75rem;
}

.feature-description {
    color: #64748b;
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ===== KNOWLEDGE CARDS ===== */
.knowledge-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s;
    border: 2px solid #f1f5f9;
    text-align: center;
}

.knowledge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-color: #1a4b84;
}

.knowledge-icon {
    font-size: 3rem;
    color: #1a4b84;
    margin-bottom: 1.5rem;
}

.knowledge-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1rem;
}

.knowledge-description {
    color: #64748b;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.knowledge-stats .badge {
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    font-weight: 600;
}

/* ===== WHY CHOOSE SECTION ===== */
.why-choose-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.why-item {
    display: flex;
    gap: 1rem;
    align-items: start;
}

.why-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1a4b84;
    font-size: 1.5rem;
}

.why-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.5rem;
}

.why-description {
    color: #64748b;
    line-height: 1.7;
    margin: 0;
}

/* ===== COMPARISON CARD ===== */
.comparison-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.comparison-item {
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.comparison-item.traditional {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    border: 2px solid #fecaca;
}

.comparison-item.modern {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border: 2px solid #bbf7d0;
}

.comparison-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.comparison-list li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.comparison-divider {
    text-align: center;
    font-size: 2rem;
    color: #1a4b84;
    margin: 1rem 0;
}

/* ===== QUIZ FEATURE ===== */
.quiz-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quiz-feature-item {
    display: flex;
    gap: 1.25rem;
    align-items: start;
}

.quiz-feature-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1a4b84;
    font-size: 1.75rem;
}

.quiz-feature-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.5rem;
}

.quiz-feature-description {
    color: #64748b;
    line-height: 1.7;
    margin: 0;
}

.quiz-demo-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.08);
    border: 2px solid #f1f5f9;
}

.quiz-demo-header {
    background: linear-gradient(135deg, #1a4b84 0%, #0f3054 100%);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px 12px 0 0;
    margin: -2rem -2rem 2rem;
    font-weight: 600;
}

.quiz-question {
    margin-bottom: 1.5rem;
}

.quiz-number {
    display: inline-block;
    background: #1a4b84;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.quiz-text {
    font-size: 1.05rem;
    font-weight: 600;
    color: #0f172a;
    margin: 0;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    transition: all 0.3s;
    cursor: pointer;
}

.quiz-option:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
}

.quiz-option-correct {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-color: #6ee7b7;
}

.quiz-explanation {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-left: 4px solid #f59e0b;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    font-size: 0.95rem;
    color: #78350f;
}

/* ===== VIDEO SECTION ===== */
.video-container {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
    border: 3px solid #f1f5f9;
}

/* ===== FAQ SECTION ===== */
.accordion-item {
    border: 2px solid #f1f5f9;
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s;
}

.accordion-item:hover {
    border-color: #1a4b84;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.accordion-button {
    font-weight: 600;
    color: #0f172a;
    padding: 1.25rem 1.5rem;
    font-size: 1.05rem;
    background: white;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    color: #1a4b84;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: #1a4b84;
}

.accordion-body {
    padding: 1.5rem;
    color: #64748b;
    line-height: 1.8;
}

/* ===== CTA SECTION ===== */
.bg-gradient-primary {
    background: linear-gradient(135deg, #1a4b84 0%, #0f3054 100%);
    position: relative;
    overflow: hidden;
}

.bg-gradient-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* ===== FOOTER ===== */
.footer {
    background: #0f172a;
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    font-weight: 700;
}

.footer-description {
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
    margin-top: 1rem;
}

.footer-title {
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s;
}

.footer-links a:hover {
    color: white;
    padding-left: 0.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s;
}

.social-link:hover {
    background: #1a4b84;
    transform: translateY(-3px);
    color: white;
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

.fade-in-delay-1 {
    animation: fadeInUp 0.8s ease-out;
}

.fade-in-delay-2 {
    animation: fadeInUp 1s ease-out;
}

.fade-in-delay-3 {
    animation: fadeInUp 1.2s ease-out;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}