:root {
    --font-main: "Segoe UI", "SF Pro Display", sans-serif;
    --font-mono: "Consolas", "SFMono-Regular", monospace;
    --radius-lg: 28px;
    --radius-md: 20px;
    --radius-sm: 14px;
    --shadow-glass: 0 24px 80px rgba(0, 0, 0, 0.38);
    --transition-fast: 160ms ease;
    --page-max-width: 760px;
    --sticky-offset: env(safe-area-inset-bottom, 0px);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

button,
input,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

.shell-background {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top, rgba(0, 209, 255, 0.14), transparent 32%),
        radial-gradient(circle at 85% 15%, rgba(61, 114, 255, 0.18), transparent 22%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 35%);
    pointer-events: none;
}

.eyebrow {
    margin: 0 0 10px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-accent);
}

.helper-text {
    margin: 10px 0 0;
    color: var(--color-muted);
    font-size: 0.92rem;
}