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

:root {
    color-scheme: dark;
    --ink: #eafaff;
    --muted: #9bb9ca;
    --cyan: #52e5ff;
    --violet: #9d74ff;
    --deep: #07142f;
    --panel: rgba(10, 28, 61, 0.78);
    --line: rgba(126, 225, 255, 0.18);
}

body {
    min-height: 100vh;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.7;
    background:
        radial-gradient(circle at 15% 8%, rgba(47, 208, 255, 0.18), transparent 32rem),
        radial-gradient(circle at 88% 24%, rgba(132, 75, 255, 0.22), transparent 30rem),
        linear-gradient(155deg, #050d22 0%, var(--deep) 48%, #10082f 100%);
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    opacity: 0.28;
    background-image:
        linear-gradient(rgba(110, 220, 255, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(110, 220, 255, 0.07) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(to bottom, black, transparent 86%);
}

a {
    color: var(--cyan);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(760px, 100%);
    margin: 0 auto;
    padding: 60px 24px 80px;
}

.header {
    margin-bottom: 38px;
    text-align: center;
}

.logo {
    width: 128px;
    height: 128px;
    margin-bottom: 18px;
    border: 1px solid rgba(171, 242, 255, 0.5);
    border-radius: 28px;
    box-shadow: 0 18px 55px rgba(0, 202, 255, 0.22);
}

.header h1 {
    margin-bottom: 4px;
    font-size: clamp(2rem, 7vw, 3.2rem);
    line-height: 1.1;
    letter-spacing: 0.02em;
    text-shadow: 0 0 28px rgba(82, 229, 255, 0.24);
}

.tagline {
    color: var(--muted);
    font-size: 1.15rem;
}

.subtitle {
    color: var(--muted);
    font-size: 1rem;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.nav-links a {
    padding: 8px 15px;
    color: var(--muted);
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.nav-active {
    color: var(--ink);
    border-color: rgba(82, 229, 255, 0.52);
    background: rgba(82, 229, 255, 0.09);
    text-decoration: none;
}

.card {
    margin-bottom: 18px;
    padding: 30px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--panel);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.16);
    backdrop-filter: blur(14px);
}

.card.highlight {
    border-color: rgba(82, 229, 255, 0.38);
    background: linear-gradient(135deg, rgba(20, 83, 131, 0.72), rgba(49, 23, 102, 0.72));
}

.card h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    color: #c9f9ff;
    font-size: 1.15rem;
}

.card h2 span {
    color: var(--cyan);
}

.card h3 {
    margin: 20px 0 5px;
    color: #d6f9ff;
    font-size: 1rem;
}

.card p + p {
    margin-top: 10px;
}

.features {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.feature-item {
    padding: 20px 14px;
    text-align: center;
    border: 1px solid rgba(137, 210, 255, 0.14);
    border-radius: 15px;
    background: rgba(50, 80, 144, 0.13);
}

.feat-icon {
    margin-bottom: 6px;
    color: var(--cyan);
    font-size: 1.55rem;
    font-weight: 800;
    letter-spacing: 0.04em;
}

.feature-item h3 {
    margin: 0 0 3px;
}

.feature-item p {
    color: var(--muted);
    font-size: 0.86rem;
}

.center {
    text-align: center;
}

.contact-btn {
    display: inline-block;
    margin-top: 8px;
    padding: 12px 26px;
    color: #06142e;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--cyan), #9bc8ff);
    font-weight: 750;
}

.contact-btn:hover {
    filter: brightness(1.05);
    text-decoration: none;
}

.footer {
    margin-top: 42px;
    padding-top: 22px;
    color: var(--muted);
    border-top: 1px solid var(--line);
    text-align: center;
    font-size: 0.82rem;
}

@media (max-width: 560px) {
    .container {
        padding: 38px 15px 58px;
    }

    .card {
        padding: 23px 20px;
    }

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