:root {
    --background: #06191a;
    --background-deep: #041415;

    --card-background: rgba(10, 38, 39, 0.92);
    --card-border: rgba(91, 231, 208, 0.16);

    --feature-background: rgba(255, 255, 255, 0.035);
    --feature-border: rgba(255, 255, 255, 0.08);

    --accent: #62ead5;
    --accent-soft: rgba(98, 234, 213, 0.12);
    --accent-border: rgba(98, 234, 213, 0.22);

    --text-primary: #f4fbfa;
    --text-secondary: #a8c1bf;
    --text-muted: #76908e;

    --card-radius: 46px;
    --feature-radius: 24px;

    --shadow:
        0 35px 100px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;
    margin: 0;

    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    color: var(--text-primary);

    background:
        radial-gradient(
            circle at 18% 8%,
            rgba(43, 151, 137, 0.15),
            transparent 32%
        ),
        radial-gradient(
            circle at 86% 85%,
            rgba(22, 104, 97, 0.11),
            transparent 34%
        ),
        linear-gradient(
            145deg,
            var(--background) 0%,
            var(--background-deep) 100%
        );
}

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

.page-shell {
    width: 100%;
    min-height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 48px;
}

.landing-card {
    position: relative;
    overflow: hidden;

    width: min(1180px, 100%);
    min-height: min(760px, calc(100vh - 96px));

    display: flex;
    flex-direction: column;

    padding: 42px 54px 32px;

    background:
        linear-gradient(
            145deg,
            rgba(18, 64, 63, 0.78),
            rgba(5, 27, 29, 0.96) 68%
        );

    border: 1px solid var(--card-border);
    border-radius: var(--card-radius);

    box-shadow: var(--shadow);
}

.landing-card::before {
    content: "";

    position: absolute;
    top: -180px;
    left: -170px;

    width: 480px;
    height: 480px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(80, 225, 202, 0.12),
            transparent 68%
        );

    pointer-events: none;
}

.landing-card::after {
    content: "";

    position: absolute;
    right: -180px;
    bottom: -240px;

    width: 560px;
    height: 560px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(26, 112, 103, 0.12),
            transparent 70%
        );

    pointer-events: none;
}

.site-header,
.hero-content,
.site-footer {
    position: relative;
    z-index: 1;
}

.site-header {
    display: flex;
    align-items: center;

    min-height: 72px;
}

.site-logo {
    width: 184px;
    height: auto;
}

.hero-content {
    flex: 1;

    display: flex;
    flex-direction: column;
    justify-content: center;

    width: 100%;
    max-width: 820px;

    margin: 20px auto;
    padding: 40px 0;

    text-align: center;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    align-self: center;

    margin-bottom: 24px;
    padding: 9px 16px;

    color: var(--accent);

    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.16em;
    line-height: 1;
    text-transform: uppercase;

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 999px;
}

h1 {
    max-width: 780px;

    margin: 0 auto;

    font-size: clamp(2.65rem, 5vw, 5rem);
    font-weight: 750;
    letter-spacing: -0.055em;
    line-height: 1.02;
}

h1 span {
    display: block;

    margin-top: 8px;

    color: var(--accent);
}

.hero-description {
    max-width: 690px;

    margin: 28px auto 0;

    color: var(--text-secondary);

    font-size: clamp(1rem, 1.5vw, 1.14rem);
    line-height: 1.75;
}

.features {
    width: min(540px, 100%);

    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;

    margin: 42px auto 0;
}

.feature-card {
    position: relative;
    overflow: hidden;

    padding: 26px;

    text-align: left;

    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.055),
            rgba(255, 255, 255, 0.022)
        );

    border: 1px solid var(--feature-border);
    border-radius: var(--feature-radius);

    box-shadow:
        0 18px 48px rgba(0, 0, 0, 0.16);

    transition:
        transform 180ms ease,
        border-color 180ms ease,
        background 180ms ease;
}

.feature-card::before {
    content: "";

    position: absolute;
    top: 0;
    left: 28px;
    right: 28px;

    height: 1px;

    background:
        linear-gradient(
            90deg,
            transparent,
            rgba(98, 234, 213, 0.45),
            transparent
        );
}

.feature-card:hover {
    transform: translateY(-3px);

    border-color: rgba(98, 234, 213, 0.18);

    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.07),
            rgba(255, 255, 255, 0.03)
        );
}

/*
    Retained in case numbered feature cards
    are added again later.
*/
.feature-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 42px;
    height: 42px;

    margin-bottom: 18px;

    color: var(--accent);

    font-size: 0.82rem;
    font-weight: 800;

    background: var(--accent-soft);

    border: 1px solid var(--accent-border);
    border-radius: 14px;
}

.feature-content h2 {
    margin: 0 0 12px;

    color: var(--text-primary);

    font-size: 1.14rem;
    font-weight: 720;
    letter-spacing: -0.02em;
}

.feature-content p {
    margin: 0;

    color: var(--text-secondary);

    font-size: 0.94rem;
    line-height: 1.68;
}

.site-footer {
    display: flex;
    justify-content: center;

    padding-top: 18px;

    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.site-footer p {
    margin: 0;

    color: var(--text-muted);

    font-size: 0.8rem;
    letter-spacing: 0.03em;
}

/* Tablet and mobile */
@media (max-width: 760px) {
    .page-shell {
        align-items: flex-start;

        padding: 20px;
    }

    .landing-card {
        min-height: calc(100vh - 40px);

        padding: 28px 24px 24px;

        border-radius: 32px;
    }

    .site-header {
        min-height: 58px;
    }

    .site-logo {
        width: 160px;
    }

    .hero-content {
        margin: auto;
        padding: 46px 0;
    }

    .status-badge {
        margin-bottom: 20px;
    }

    h1 {
        font-size: clamp(2.35rem, 10vw, 3.5rem);
        line-height: 1.06;
    }

    .hero-description {
        margin-top: 22px;

        font-size: 1rem;
        line-height: 1.65;
    }

    .features {
        margin-top: 32px;
    }

    .feature-card {
        padding: 22px;
    }

    .site-footer {
        text-align: center;
    }
}

/* Smaller phones */
@media (max-width: 420px) {
    .page-shell {
        padding: 12px;
    }

    .landing-card {
        min-height: calc(100vh - 24px);

        padding: 22px 18px 20px;

        border-radius: 26px;
    }

    .site-logo {
        width: 144px;
    }

    .hero-content {
        padding: 38px 0;
    }

    h1 {
        font-size: 2.25rem;
    }

    .hero-description {
        font-size: 0.94rem;
    }

    .feature-card {
        padding: 20px;
        border-radius: 20px;
    }

    .feature-content h2 {
        font-size: 1.06rem;
    }

    .feature-content p {
        font-size: 0.9rem;
    }
}