:root {
    --bg: #ffffff;
    --bg-alt: #f4f6fb;
    --text: #1f2430;
    --muted: #5b6472;
    --accent: #4f7cff;
    --accent-dark: #3558c7;
    --border: #e3e7ef;
    --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- Header ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }

.nav {
    display: flex;
    gap: 28px;
}
.nav a {
    color: var(--muted);
    font-size: 0.95rem;
    transition: color 0.2s;
}
.nav a:hover { color: var(--accent); }

.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}
.burger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: transform 0.25s, opacity 0.25s;
}

/* ---------- Hero ---------- */
.hero {
    padding: 110px 0 90px;
    background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
    text-align: center;
}

.hero__tag {
    display: inline-block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    background: rgba(79, 124, 255, 0.1);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 22px;
}

.hero__title {
    font-size: clamp(1.9rem, 5vw, 3.2rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero__text {
    max-width: 620px;
    margin: 0 auto 32px;
    color: var(--muted);
    font-size: 1.05rem;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background: var(--accent);
    color: #fff;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.2s, transform 0.15s;
}
.btn:hover { background: var(--accent-dark); transform: translateY(-1px); }

.btn--outline {
    background: transparent;
    border: 1.5px solid var(--accent);
    color: var(--accent);
}
.btn--outline:hover { background: var(--accent); color: #fff; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }

.section__title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    text-align: center;
}
.section__title::after {
    content: "";
    display: block;
    width: 48px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    margin: 14px auto 0;
}

.section__text {
    max-width: 680px;
    margin: 0 auto 42px;
    text-align: center;
    color: var(--muted);
}

/* ---------- Cards ---------- */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px 24px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(31, 36, 48, 0.08);
}
.card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}
.card p { color: var(--muted); font-size: 0.92rem; }

/* ---------- Tasks ---------- */
.tasks {
    max-width: 640px;
    margin: 0 auto;
    list-style: none;
    display: grid;
    gap: 12px;
}
.tasks li {
    position: relative;
    padding: 14px 18px 14px 46px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
}
.tasks li::before {
    content: "✓";
    position: absolute;
    left: 18px;
    color: var(--accent);
    font-weight: 700;
}

/* ---------- Team ---------- */
.team {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
.member {
    text-align: center;
    padding: 26px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
}
.member__avatar {
    width: 72px;
    height: 72px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}
.member h3 { font-size: 1rem; margin-bottom: 4px; }
.member p { color: var(--muted); font-size: 0.85rem; }

/* ---------- Footer ---------- */
.footer {
    padding: 28px 0;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.85rem;
}

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
    .burger { display: flex; }

    .nav {
        position: fixed;
        inset: 64px 0 auto 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        padding: 8px 20px 18px;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
    }
    .nav.open { transform: translateY(0); }
    .nav a { padding: 12px 0; border-bottom: 1px solid var(--border); }
    .nav a:last-child { border-bottom: none; }

    .hero { padding: 80px 0 60px; }
    .section { padding: 60px 0; }
}