:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --dark: #111827;
    --gray-900: #1f2937;
    --gray-700: #374151;
    --gray-500: #6b7280;
    --gray-300: #d1d5db;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --level-101: #10b981;
    --level-201: #f59e0b;
    --level-301: #ef4444;
}

* { font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; }

body { 
    color: var(--dark); 
    background: var(--white);
}

/* Navigation */
.navbar {
    background: var(--white);
    padding: 15px 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.navbar-brand {
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--dark) !important;
}
.navbar-brand span { color: var(--primary); }
.nav-link { 
    color: var(--gray-700) !important; 
    font-weight: 500;
    margin: 0 10px;
}
.nav-link:hover { color: var(--primary) !important; }
.btn-nav {
    background: var(--primary);
    color: var(--white) !important;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}
.btn-nav:hover { 
    background: var(--primary-dark); 
    color: var(--white) !important;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--dark) 0%, var(--gray-900) 100%);
    padding: 80px 0 100px;
    color: var(--white);
}
.badge-pill {
    display: inline-block;
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
}
.hero h1 span { color: var(--primary-light); }
.hero-subtitle {
    font-size: 1.2rem;
    color: var(--gray-300);
    margin-bottom: 32px;
    max-width: 550px;
    line-height: 1.7;
}
.hero-cta {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}
.btn-hero {
    background: var(--primary);
    color: var(--white);
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    text-decoration: none;
    transition: all 0.2s;
}
.btn-hero:hover { 
    background: var(--primary-dark); 
    color: var(--white);
    transform: translateY(-2px);
}
.btn-hero-outline {
    background: transparent;
    color: var(--white);
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    border: 2px solid var(--gray-500);
    text-decoration: none;
    transition: all 0.2s;
}
.btn-hero-outline:hover { 
    border-color: var(--white); 
    color: var(--white); 
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 50px;
}
.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
    margin: 0;
}
.stat-item p {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin: 0;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}
.ratio-display {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px 60px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.1);
}
.ratio-label {
    font-size: 1rem;
    color: var(--gray-300);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}
.ratio-value {
    font-size: 5rem;
    font-weight: 900;
    color: var(--white);
    line-height: 1;
}
.ratio-status {
    margin-top: 15px;
    font-weight: 700;
    font-size: 1.1rem;
}
.ratio-status.qualified { color: var(--secondary); }

/* Quick Overview */
.quick-overview {
    padding: 80px 0;
    background: var(--gray-50);
}
.quick-overview h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 20px;
}
.quick-overview h2 span { color: var(--primary); }
.quick-overview .lead {
    font-size: 1.1rem;
    color: var(--gray-700);
    margin-bottom: 25px;
}
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.feature-list li {
    padding: 10px 0;
    font-size: 1.05rem;
    color: var(--gray-700);
}
.feature-list i {
    color: var(--secondary);
    margin-right: 10px;
}

.formula-card {
    background: var(--white);
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border: 1px solid var(--gray-100);
}
.formula-card h4 {
    font-weight: 700;
    margin-bottom: 25px;
    color: var(--dark);
}
.formula {
    text-align: center;
    padding: 20px;
    background: var(--gray-50);
    border-radius: 12px;
    margin-bottom: 20px;
}
.formula-top, .formula-bottom {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-700);
    padding: 10px;
}
.formula-line {
    height: 3px;
    background: var(--primary);
    margin: 5px 40px;
}
.formula-example {
    text-align: center;
    padding: 15px;
    background: rgba(99, 102, 241, 0.05);
    border-radius: 8px;
    margin-bottom: 15px;
}
.formula-example .highlight {
    color: var(--primary);
    font-weight: 700;
}
.formula-note {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.9rem;
    margin: 0;
}

/* Course Section */
.courses-section {
    padding: 80px 0;
}
.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 10px;
}
.section-title span { color: var(--primary); }
.section-subtitle {
    color: var(--gray-500);
    font-size: 1.1rem;
}

.course-card {
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    height: 100%;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    border: 2px solid var(--gray-100);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}
.course-card.level-101:hover { border-color: var(--level-101); }
.course-card.level-201:hover { border-color: var(--level-201); }
.course-card.level-301:hover { border-color: var(--level-301); }

.course-badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
}
.level-101 .course-badge { background: rgba(16, 185, 129, 0.1); color: var(--level-101); }
.level-201 .course-badge { background: rgba(245, 158, 11, 0.1); color: var(--level-201); }
.level-301 .course-badge { background: rgba(239, 68, 68, 0.1); color: var(--level-301); }

.course-level {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 15px;
}
.level-101 .course-level { color: var(--level-101); }
.level-201 .course-level { color: var(--level-201); }
.level-301 .course-level { color: var(--level-301); }

.course-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.course-card > p {
    color: var(--gray-500);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.course-topics {
    list-style: none;
    padding: 0;
    margin: 0 0 25px 0;
}
.course-topics li {
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-100);
}
.course-topics li:last-child { border-bottom: none; }
.course-topics a {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
}
.course-topics a i {
    margin-right: 10px;
    opacity: 0.5;
}
.course-topics a:hover { color: var(--primary); }
.course-topics a:hover i { opacity: 1; }

.btn-course {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    color: var(--white);
}
.level-101 .btn-course { background: var(--level-101); }
.level-201 .btn-course { background: var(--level-201); }
.level-301 .btn-course { background: var(--level-301); }
.btn-course:hover { 
    color: var(--white);
    transform: translateX(5px);
}

/* Calculator Section */
.calculator-section {
    padding: 80px 0;
    background: var(--gray-50);
}

.calc-card {
    background: var(--white);
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.calc-section h5 {
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--gray-100);
}
.form-label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.9rem;
}
.form-control {
    border-radius: 8px;
    padding: 12px;
    border-color: var(--gray-300);
}
.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.input-group-text {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

.result-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    color: var(--white);
}
.result-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
}
.result-value {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.2;
}
.result-verdict {
    margin-top: 10px;
}
.verdict-pass {
    background: rgba(16, 185, 129, 0.2);
    padding: 8px 20px;
    border-radius: 50px;
    display: inline-block;
    font-weight: 600;
}
.verdict-marginal {
    background: rgba(245, 158, 11, 0.2);
    padding: 8px 20px;
    border-radius: 50px;
    display: inline-block;
    font-weight: 600;
}
.verdict-fail {
    background: rgba(239, 68, 68, 0.2);
    padding: 8px 20px;
    border-radius: 50px;
    display: inline-block;
    font-weight: 600;
}

.cta-box {
    text-align: center;
    padding: 25px;
    background: var(--gray-50);
    border-radius: 12px;
    border: 2px dashed var(--gray-300);
}
.cta-box p {
    margin-bottom: 15px;
    color: var(--gray-700);
}
.btn-cta {
    background: var(--primary);
    color: var(--white);
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    display: inline-block;
}
.btn-cta:hover {
    background: var(--primary-dark);
    color: var(--white);
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
}
.accordion-item {
    border: 1px solid var(--gray-200);
    margin-bottom: 10px;
    border-radius: 12px !important;
    overflow: hidden;
}
.accordion-button {
    font-weight: 600;
    color: var(--dark);
    padding: 20px 25px;
}
.accordion-button:not(.collapsed) {
    background: var(--gray-50);
    color: var(--primary);
}
.accordion-button:focus {
    box-shadow: none;
    border-color: var(--gray-200);
}
.accordion-body {
    padding: 20px 25px;
    color: var(--gray-700);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}
.cta-content {
    text-align: center;
    color: var(--white);
}
.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
}
.cta-content p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 30px;
}
.btn-cta-main {
    background: var(--white);
    color: var(--primary);
    padding: 16px 40px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    transition: all 0.2s;
    display: inline-block;
}
.btn-cta-main:hover {
    background: var(--gray-100);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--gray-300);
    padding: 60px 0 30px;
}
.footer h5 {
    color: var(--white);
    font-weight: 800;
    margin-bottom: 15px;
}
.footer h5 span { color: var(--primary-light); }
.footer h6 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 10px;
}
.footer-links a {
    color: var(--gray-500);
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.9rem;
}
.footer-links a:hover {
    color: var(--primary-light);
}
.footer hr {
    border-color: var(--gray-700);
    margin: 40px 0 20px;
}
.disclosure {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--gray-700);
}
.disclosure a {
    color: var(--primary-light);
}

/* Course Page Styles */
.course-header {
    background: linear-gradient(135deg, var(--dark) 0%, var(--gray-900) 100%);
    padding: 60px 0;
    color: var(--white);
}
.course-header .breadcrumb {
    background: none;
    padding: 0;
    margin-bottom: 20px;
}
.course-header .breadcrumb-item a {
    color: var(--gray-400);
    text-decoration: none;
}
.course-header .breadcrumb-item.active {
    color: var(--gray-300);
}
.course-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
}
.course-header .lead {
    color: var(--gray-300);
    font-size: 1.1rem;
}

.course-content {
    padding: 60px 0;
}
.course-content h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--dark);
}
.course-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--gray-900);
}
.course-content p {
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 20px;
}
.course-content ul, .course-content ol {
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 20px;
}

.info-box {
    background: rgba(99, 102, 241, 0.05);
    border-left: 4px solid var(--primary);
    padding: 20px 25px;
    border-radius: 0 8px 8px 0;
    margin: 25px 0;
}
.info-box h5 {
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 10px;
}
.info-box p:last-child {
    margin-bottom: 0;
}

.warning-box {
    background: rgba(245, 158, 11, 0.05);
    border-left: 4px solid var(--level-201);
    padding: 20px 25px;
    border-radius: 0 8px 8px 0;
    margin: 25px 0;
}
.warning-box h5 {
    color: var(--level-201);
    font-weight: 700;
    margin-bottom: 10px;
}

.example-box {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    padding: 25px;
    border-radius: 12px;
    margin: 25px 0;
}
.example-box h5 {
    font-weight: 700;
    margin-bottom: 15px;
}

.course-nav {
    display: flex;
    justify-content: space-between;
    padding: 30px 0;
    border-top: 1px solid var(--gray-200);
    margin-top: 40px;
}
.course-nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.course-nav a:hover {
    color: var(--primary-dark);
}

.sidebar-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
}
.sidebar-card h5 {
    font-weight: 700;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--gray-100);
}
.sidebar-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.sidebar-links li {
    margin-bottom: 8px;
}
.sidebar-links a {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.2s;
}
.sidebar-links a:hover {
    background: var(--gray-50);
    color: var(--primary);
}
.sidebar-links a.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 991px) {
    .hero h1 { font-size: 2.5rem; }
    .hero-stats { gap: 25px; }
    .stat-item h3 { font-size: 2rem; }
    .section-title { font-size: 1.8rem; }
}

@media (max-width: 767px) {
    .hero { padding: 60px 0 80px; }
    .hero h1 { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-stats { flex-wrap: wrap; gap: 20px; }
    .course-level { font-size: 3rem; }
    .result-value { font-size: 3rem; }
    .cta-content h2 { font-size: 1.8rem; }
    .course-header h1 { font-size: 1.8rem; }
}