/* === Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --accent: #10B981;
    --accent-dark: #059669;
    --bg: #FAFAFA;
    --bg-dark: #111827;
    --bg-card: #FFFFFF;
    --text: #1F2937;
    --text-light: #6B7280;
    --text-inverse: #F9FAFB;
    --border: #E5E7EB;
    --red: #EF4444;
    --green: #10B981;
    --blue: #3B82F6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); text-align: center; margin-bottom: 16px; }
h3 { font-size: 1.25rem; }

.section-sub {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 48px;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-secondary:hover {
    background: var(--primary);
    color: white;
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.15rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: 16px 0;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}
.nav-link:hover {
    color: var(--primary);
}

.nav-cta {
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.2s;
}
.nav-cta:hover {
    background: var(--primary-dark);
}

/* === Hero Section === */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    background: linear-gradient(180deg, #EEF2FF 0%, var(--bg) 100%);
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.hero h1 {
    margin-bottom: 24px;
    color: var(--bg-dark);
}

.highlight {
    color: var(--primary);
    position: relative;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-proof {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.proof-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.proof-item strong {
    font-size: 1.8rem;
    color: var(--primary);
}

.proof-item span {
    font-size: 0.85rem;
    color: var(--text-light);
}

.proof-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

/* === Problem Section === */
.problem {
    padding: 100px 0;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.problem-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: box-shadow 0.2s;
}
.problem-card:hover {
    box-shadow: var(--shadow-md);
}

.problem-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.problem-card p {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
}

.problem-insight {
    text-align: center;
    padding: 40px;
    background: var(--bg-dark);
    color: var(--text-inverse);
    border-radius: var(--radius);
}

.problem-insight p {
    font-size: 1.25rem;
}

.problem-insight .small {
    font-size: 1rem;
    opacity: 0.7;
    margin-top: 8px;
}

/* === Solution Section === */
.solution {
    padding: 100px 0;
    background: #EEF2FF;
}

.flow-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.flow-num {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.flow-step span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--primary-light);
    margin-top: -20px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--primary);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* === Tracks Section === */
.tracks {
    padding: 100px 0;
}

.tracks-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.track-card {
    padding: 32px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all 0.2s;
}
.track-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.track-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.track-card h3 {
    margin-bottom: 4px;
}

.track-count {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.track-card ul {
    list-style: none;
    margin-bottom: 20px;
}

.track-card li {
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-light);
    border-bottom: 1px solid var(--border);
}

.track-card li:last-child {
    border-bottom: none;
    font-weight: 600;
    color: var(--primary);
}

.track-time {
    font-size: 0.8rem;
    color: var(--accent-dark);
    font-weight: 600;
    padding: 8px 12px;
    background: #ECFDF5;
    border-radius: var(--radius-sm);
    text-align: center;
}

/* === Previews Section === */
.previews {
    padding: 100px 0;
    background: #F9FAFB;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.preview-card {
    padding: 32px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.steps-label {
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.preview-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.preview-meta {
    display: flex;
    flex-direction: column;
}

.preview-meta strong {
    color: var(--text);
}

.preview-meta span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Case Study */
.case-study {
    text-align: center;
    padding: 48px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.case-study h3 {
    font-size: 1.4rem;
    margin-bottom: 32px;
}

.case-study-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.case-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
}

.stat-value.red { color: var(--red); }
.stat-value.green { color: var(--green); }
.stat-value.blue { color: var(--blue); }

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-light);
}

.case-arrow {
    font-size: 2rem;
    color: var(--text-light);
}

/* === Pricing Section === */
.pricing {
    padding: 100px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 48px;
}

.price-card {
    padding: 40px 32px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    position: relative;
}

.price-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
}

.price-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.price-card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.price {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text);
    line-height: 1;
}

.price-period {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 32px;
}

.price-features {
    list-style: none;
    margin-bottom: 32px;
}

.price-features li {
    padding: 10px 0;
    font-size: 0.95rem;
    color: var(--text-light);
    border-bottom: 1px solid var(--border);
    padding-left: 24px;
    position: relative;
}

.price-features li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

.guarantee {
    text-align: center;
    padding: 32px;
    background: #ECFDF5;
    border-radius: var(--radius);
    max-width: 600px;
    margin: 0 auto;
}

.guarantee h4 {
    color: var(--accent-dark);
    margin-bottom: 8px;
}

.guarantee p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* === FAQ Section === */
.faq {
    padding: 100px 0;
    background: #F9FAFB;
}

.faq-list {
    max-width: 700px;
    margin: 48px auto 0;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-item summary {
    padding: 20px 0;
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 300;
}

.faq-item[open] summary::after {
    content: "\2212";
}

.faq-item p {
    padding: 0 0 20px;
    color: var(--text-light);
    line-height: 1.7;
}

/* === Final CTA === */
.final-cta {
    padding: 100px 0;
    background: var(--bg-dark);
    text-align: center;
    color: var(--text-inverse);
}

.final-cta h2 {
    color: white;
    margin-bottom: 16px;
}

.final-cta p {
    color: rgba(255,255,255,0.7);
    font-size: 1.1rem;
    margin-bottom: 40px;
    line-height: 1.7;
}

.final-proof {
    margin-top: 24px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* === Footer === */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-light);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-light);
    text-decoration: none;
}
.footer-links a:hover {
    color: var(--primary);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .tracks-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .problem-grid {
        grid-template-columns: 1fr;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .tracks-grid {
        grid-template-columns: 1fr;
    }
    .preview-grid {
        grid-template-columns: 1fr;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    .hero {
        padding: 120px 0 80px;
    }
    .hero-proof {
        gap: 20px;
    }
    .case-study-grid {
        flex-direction: column;
        gap: 24px;
    }
    .case-arrow {
        transform: rotate(90deg);
    }
    .footer-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    .flow-arrow {
        display: none;
    }
    .flow-steps {
        gap: 8px;
    }
    .nav-link {
        font-size: 0.85rem;
    }
    .nav-links {
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .btn-lg {
        padding: 16px 28px;
        font-size: 1rem;
    }
    .price {
        font-size: 2.8rem;
    }
}