:root {
    --surface: rgb(47, 168, 208);
    --surface-dim: rgba(47, 168, 208, 0.15);
    --surface-line: rgba(47, 168, 208, 0.35);
    --bg: rgb(4, 0, 10);
    --bg-elevated: rgb(13, 10, 22);
    --text: rgb(255, 255, 255);
    --text-dim: rgba(255, 255, 255, 0.68);
    --accent-2: #c59eff;
    --radius: 16px;
    --nav-height: 70px;
    --page-pad: clamp(20px, 6vw, 100px);
}

html {
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--text);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-text-size-adjust: 100%;
}

body {
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 900px 500px at 15% -10%, var(--surface-dim), transparent 60%),
        radial-gradient(ellipse 700px 500px at 100% 10%, rgba(197, 158, 255, 0.08), transparent 55%);
    background-attachment: fixed;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    overflow-x: hidden;
}

button {
    font-size: 1rem;
    font-family: inherit;
}

a {
    color: var(--text);
}

h1,
h2,
h3,
h4 {
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

p {
    color: var(--text-dim);
}

* {
    box-sizing: border-box;
}

*:focus-visible {
    outline: 2px solid var(--accent-2);
    outline-offset: 3px;
}

::selection {
    background: var(--surface);
    color: black;
}

/* scrollbar theming */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--surface);
}

.site-headline {
    margin: 0 0 clamp(24px, 5vw, 50px) 0;
    color: var(--surface);
    font-weight: bold;
    font-size: clamp(2.2rem, 8vw, 4rem);
    position: relative;
    width: fit-content;
}

.site-headline::before {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    height: 4px;
    width: 100%;
    border-radius: 20px;
    background: var(--surface);
}

.site-box {
    margin-top: calc(var(--nav-height) + clamp(30px, 8vh, 80px));
    margin-bottom: clamp(40px, 8vh, 100px);
    width: 100%;
    max-width: 1200px;
    padding: 0 var(--page-pad);
    height: fit-content;
    display: flex;
    flex-direction: column;
    margin-left: auto;
    margin-right: auto;
}

.page-lead {
    color: var(--text-dim);
    font-size: 1.05rem;
    max-width: 70ch;
    margin: -10px 0 40px 0;
}

.card {
    background: var(--bg-elevated);
    border: 1px solid var(--surface-line);
    border-radius: var(--radius);
    padding: clamp(20px, 3vw, 32px);
}

.custom-button {
    font-size: 1rem;
    font-weight: bold;
    height: 45px;
    padding: 10px 20px;
    background: var(--surface);
    color: rgb(0, 0, 0);
    cursor: pointer;
    border-radius: 20px;
    border: 2px solid var(--surface);
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s, color 0.15s, background-color 0.15s;
}

.custom-button:hover {
    border-color: white;
    color: white;
}

.custom-button.inactive {
    opacity: 0.3;
    cursor: default;
    color: black;
}

.custom-button.inactive:hover {
    border-color: var(--surface);
    color: black;
}