:root {
    --deep: #01070d;
    --ocean: #031f31;
    --aqua: #20d9e8;
    --cyan: #20d9e8;
    --green: #64ff9a;
    --ink: #04131c;
    --muted: #a9c5d3;
    --line: rgba(145, 231, 255, 0.18);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, Segoe UI, sans-serif;
    background: var(--deep);
    color: white;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--aqua);
    font-weight: 900;
    font-size: 13px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    background: linear-gradient(135deg, var(--aqua), #0b7cba);
    color: #00131b;
    font-weight: 900;
    border: 0;
    border-radius: 14px;
    padding: 17px 26px;
    box-shadow: 0 16px 40px rgba(32, 217, 232, 0.26);
    transition: 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 60px rgba(32, 217, 232, 0.36);
}

.brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: inline-grid;
    place-items: center;
    background: linear-gradient(135deg, var(--aqua), var(--green));
    color: #00131b;
    font-weight: 900;
}

.cursor-dot,
.cursor-ring {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    display: none;
}

.cursor-dot {
    width: 7px;
    height: 7px;
    background: var(--aqua);
    border-radius: 50%;
}

.cursor-ring {
    width: 38px;
    height: 38px;
    border: 1px solid rgba(32, 217, 232, 0.55);
    border-radius: 50%;
    transition: 0.12s;
}

@media (pointer: fine) {
    .cursor-dot,
    .cursor-ring {
        display: block;
    }
}

h1 {
    font-size: clamp(42px, 7vw, 96px);
    line-height: 0.96;
    margin: 8px 0 24px;
    letter-spacing: -0.05em;
}

.section h2 {
    letter-spacing: -0.045em;
}

.section p {
    line-height: 1.75;
}

/* Scroll to Top Button */
.to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 9998;

    width: 52px;
    height: 52px;
    border-radius: 50%;

    display: grid;
    place-items: center;

    border: 1px solid var(--line);
    background: linear-gradient(135deg, var(--cyan), var(--green));
    color: #00131b;

    font-size: 28px;
    font-weight: 900;
    line-height: 1;
    cursor: pointer;

    opacity: 0;
    visibility: hidden;
    transform: translateY(18px);

    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}

.to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 22px 60px rgba(32, 217, 232, 0.36);
}

.to-top:active {
    transform: scale(0.94);
}

/* Mobile Responsive */
@media (max-width: 520px) {
    .to-top {
        right: 16px;
        bottom: 16px;
        width: 46px;
        height: 46px;
        font-size: 24px;
    }
}

@media (max-width: 360px) {
    .to-top {
        right: 12px;
        bottom: 12px;
        width: 42px;
        height: 42px;
        font-size: 22px;
    }
}