:root {
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-border: #222;
    --color-text: #e5e5e5;
    --color-text-muted: #888;
    --color-accent: #4f8cff;
    --color-accent-hover: #6fa0ff;
    --color-white: #fff;
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --radius: 10px;
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

/* ── Navbar ─────────────────────────────────────────── */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    text-decoration: none;
    letter-spacing: 0.04em;
}

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

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.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(--color-text);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

/* ── Hero ───────────────────────────────────────────── */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 64px;
}

.hero-content {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-white);
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 540px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

/* ── Buttons ────────────────────────────────────────── */

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
    cursor: pointer;
}

.btn:active {
    transform: scale(0.97);
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
}

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

.btn-secondary:hover {
    border-color: var(--color-text-muted);
}

/* ── Sections ───────────────────────────────────────── */

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin-bottom: 48px;
}

/* ── Features ───────────────────────────────────────── */

.features {
    padding: 120px 0;
}

.features .container {
    text-align: center;
}

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

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: border-color 0.25s, transform 0.2s;
}

.feature-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ── About ──────────────────────────────────────────── */

.about {
    padding: 120px 0;
    border-top: 1px solid var(--color-border);
}

.about-content {
    max-width: 680px;
}

.about-text p {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin-top: 20px;
    line-height: 1.8;
}

/* ── Contact ────────────────────────────────────────── */

.contact {
    padding: 120px 0;
    border-top: 1px solid var(--color-border);
}

.contact-content {
    text-align: center;
}

.contact .btn {
    margin-top: 8px;
}

/* ── Footer ─────────────────────────────────────────── */

.footer {
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
}

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

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--color-white);
}

/* ── Mobile ─────────────────────────────────────────── */

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

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 24px;
        gap: 20px;
    }

    .nav-links.open {
        display: flex;
    }

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

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}