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

:root {
    --navy: #1a237e;
    --blue: #1565c0;
    --blue-light: #4fc3f7;
    --blue-bg: #e3f2fd;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #0f172a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--gray-900);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

img, svg {
    display: block;
    max-width: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    border: 2px solid transparent;
    border-radius: 10px;
    padding: 10px 24px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--blue);
    color: var(--white);
    border-color: var(--blue);
}

.btn-primary:hover {
    background: #1255a1;
    border-color: #1255a1;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(21, 101, 192, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
    border-radius: 12px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 35, 126, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: background var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--white);
}

.nav-logo strong {
    font-weight: 800;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--transition);
}

.nav-link:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.1);
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 20px;
    background: var(--blue);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    margin-left: 8px;
    transition: all var(--transition);
}

.nav-btn:hover {
    background: #1255a1;
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, #0d47a1 50%, var(--blue) 100%);
    padding: 140px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(79, 195, 247, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 20px;
}

.highlight {
    color: var(--blue-light);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-illustration {
    width: 100%;
    max-width: 500px;
    margin-left: auto;
}

/* ===== Sections Common ===== */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ===== Features ===== */
.features {
    padding: 100px 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 36px 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-light);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--gray-900);
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 100px 0;
    background: var(--white);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    padding: 0 20px;
}

.step-number {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--navy), var(--blue));
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.step-content p {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--gray-200);
    margin-top: 32px;
    flex-shrink: 0;
}

/* ===== Stats ===== */
.stats {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

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

.stat-number {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

/* ===== CTA ===== */
.cta {
    padding: 100px 0;
    background: var(--gray-50);
}

.cta-container {
    text-align: center;
    background: var(--white);
    border-radius: 20px;
    padding: 64px 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
}

.cta-container h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.cta-container p {
    font-size: 1.1rem;
    color: var(--gray-500);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    padding: 64px 0 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 48px;
}

.footer-brand .nav-logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 320px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: var(--gray-500);
    padding: 4px 0;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--blue-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 24px 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* ===== Animations ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-illustration {
        max-width: 400px;
        margin: 0 auto;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(26, 35, 126, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.4s ease;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-link {
        width: 100%;
        text-align: center;
        padding: 12px 16px;
    }

    .nav-btn {
        width: 100%;
        justify-content: center;
        margin-left: 0;
        margin-top: 8px;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero {
        padding: 120px 0 60px;
        min-height: auto;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 28px 24px;
    }

    .steps {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }

    .step {
        padding: 0;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }

    .cta-container {
        padding: 40px 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-lg {
        padding: 14px 24px;
        font-size: 1rem;
    }

    .btn-outline {
        border-color: rgba(255, 255, 255, 0.3);
        text-align: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}