:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #0ea5e9;
    --color-text: #0f172a;
    --color-text-soft: #475569;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, .08);
    --shadow-lg: 0 10px 30px rgba(15, 23, 42, .12);
    --radius: 12px;
    --max-width: 1140px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color .2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, .9);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-soft);
    font-weight: 500;
    font-size: .95rem;
}

.nav-links a:hover {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: 0;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform .25s ease, opacity .25s ease;
}

/* Hero */
.hero {
    padding: 96px 0 120px;
    background:
        radial-gradient(circle at 20% 20%, rgba(37, 99, 235, .08), transparent 40%),
        radial-gradient(circle at 80% 30%, rgba(14, 165, 233, .08), transparent 45%),
        var(--color-bg);
}

.hero-content {
    text-align: center;
    max-width: 760px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 800;
    letter-spacing: -.03em;
    line-height: 1.1;
    margin-bottom: 24px;
}

.accent {
    background: linear-gradient(120deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-soft);
    margin-bottom: 36px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: .95rem;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .2s ease, background-color .2s ease;
    border: 0;
    font-family: inherit;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: #fff;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

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

/* Sections */
.section {
    padding: 96px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    letter-spacing: -.02em;
    margin-bottom: 16px;
}

.section-lead {
    text-align: center;
    color: var(--color-text-soft);
    max-width: 640px;
    margin: 0 auto 56px;
    font-size: 1.05rem;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.feature {
    text-align: center;
    padding: 32px 24px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
}

.feature h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    font-weight: 700;
}

.feature p {
    color: var(--color-text-soft);
}

/* Services */
.services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.service-card {
    background: #fff;
    padding: 32px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: transform .2s ease, box-shadow .2s ease;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--color-primary);
}

.service-card p {
    color: var(--color-text-soft);
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    font-weight: 700;
}

.contact-item p {
    color: var(--color-text-soft);
    font-size: .95rem;
}

.contact-form {
    background: #fff;
    padding: 36px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    font-size: .9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: inherit;
    font-size: .95rem;
    transition: border-color .2s ease, box-shadow .2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: 0;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 64px 0 24px;
}

.footer .logo {
    color: #fff;
}

.footer h4 {
    color: #fff;
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer p {
    margin-bottom: 6px;
    font-size: .9rem;
}

.footer a {
    color: #cbd5e1;
}

.footer a:hover {
    color: #fff;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
    font-size: .9rem;
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, .08);
    text-align: center;
    font-size: .85rem;
    color: #94a3b8;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-150%);
        transition: transform .3s ease;
    }

    .nav-links.open {
        transform: translateY(0);
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 64px 0 80px;
    }

    .section {
        padding: 64px 0;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}