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

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    padding: 10px 20px;
    background: var(--primary);
    color: #fff;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 4px 14px rgba(79,70,229,0.4); }
.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: transparent; }

/* === Nav === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    display: flex;
    align-items: center;
    height: 64px;
    gap: 32px;
}
.logo {
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--text);
    text-decoration: none;
    white-space: nowrap;
}
.nav-links {
    display: flex;
    gap: 28px;
    flex: 1;
}
.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* === Hero === */
.hero {
    padding: 160px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(79,70,229,0.1);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 24px;
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    color: var(--text);
}
.hero-sub {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.hero-trust {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
}
.hero-trust span {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}
.hero-trust span::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #22c55e;
}

/* === Stats === */
.stats {
    padding: 60px 0;
    border-bottom: 1px solid var(--border);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.stat-value {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
}
.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
    display: block;
}

/* === Section Header === */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}
.section-header h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}
.section-header p {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 0 auto;
}

/* === How It Works === */
.how-it-works {
    padding: 100px 0;
}
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.step {
    padding: 36px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all 0.3s;
    background: var(--bg);
}
.step:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.step-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
    margin-bottom: 16px;
    line-height: 1;
}
.step:hover .step-number { color: var(--primary); }
.step h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.step p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* === Pricing === */
.pricing {
    padding: 100px 0;
    background: var(--bg-alt);
}
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    align-items: start;
}
.price-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    position: relative;
    transition: all 0.3s;
}
.price-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.price-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
    transform: scale(1.03);
}
.price-card.featured:hover {
    transform: scale(1.03) translateY(-4px);
}
.price-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 100px;
    white-space: nowrap;
}
.price-tier {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.price-amount {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
}
.price-unit {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.price-desc {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}
.price-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.price-features li {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}
.price-features li::before {
    content: '';
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-light);
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%234f46e5'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");
    background-size: 12px;
    background-repeat: no-repeat;
    background-position: center;
}
.pricing-cta {
    text-align: center;
    margin-top: 48px;
}
.pricing-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 12px;
}

/* === Guarantee === */
.guarantee {
    padding: 80px 0;
}
.guarantee-inner {
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    border-radius: 20px;
    padding: 64px;
    text-align: center;
}
.guarantee-inner h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    margin-bottom: 16px;
}
.guarantee-inner p {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 28px;
    line-height: 1.7;
}
.guarantee-points {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
}
.guarantee-points span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 6px;
}
.guarantee-points span::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
}

/* === CTA === */
.cta {
    padding: 100px 0;
    text-align: center;
    background: var(--bg-dark);
    color: #fff;
}
.cta h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.cta p {
    font-size: 1.05rem;
    color: var(--text-light);
    margin-bottom: 32px;
}

/* === FAQ === */
.faq {
    padding: 100px 0;
}
.faq-list {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.2s;
}
.faq-item[open] { border-color: var(--primary); }
.faq-item summary {
    padding: 20px 24px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-muted);
    transition: transform 0.2s;
    flex-shrink: 0;
    margin-left: 16px;
}
.faq-item[open] summary::after { content: '-'; }
.faq-item[open] summary { color: var(--primary); }
.faq-item p {
    padding: 0 24px 20px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* === Footer === */
.footer {
    background: var(--bg-dark);
    color: #cbd5e1;
    padding: 72px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer-brand .logo { color: #fff; }
.footer-brand p {
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
    max-width: 300px;
}
.footer-badge {
    display: inline-block;
    margin-top: 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #22c55e;
    padding: 4px 12px;
    border: 1px solid rgba(34,197,94,0.3);
    border-radius: 100px;
}
.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    text-decoration: none;
    padding: 4px 0;
    transition: color 0.2s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-light);
}
.footer-social {
    display: flex;
    gap: 16px;
}
.footer-social a {
    color: var(--text-light);
    transition: color 0.2s;
}
.footer-social a:hover { color: #fff; }

/* === Responsive === */
@media (max-width: 1024px) {
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav .btn-sm { display: none; }
    .mobile-toggle { display: flex; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .steps-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    .price-card.featured { transform: none; }
    .price-card.featured:hover { transform: translateY(-4px); }
    .guarantee-inner { padding: 40px 24px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
    .hero { padding: 120px 0 60px; }
}