:root {
    --ad-wall: #F2F3EF;
    --ad-paper: #FFFFFF;
    --ad-ink: #1D2522;
    --ad-mute: #5B6761;
    --ad-line: #D5D9D2;
    --ad-accent: #2D3FA8;
    --ad-accent-ink: #FFFFFF;
    --ad-red: #C2342A;
    --ad-soft: #E9ECE6;
    --ad-shadow: 0 1px 0 rgba(29, 37, 34, .05), 0 12px 28px -20px rgba(29, 37, 34, .4);
    --ad-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "URW Palladio L", P052, Georgia, serif;
    --ad-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --ad-wall: #141817;
        --ad-paper: #1D2321;
        --ad-ink: #E6E9E3;
        --ad-mute: #9DA8A2;
        --ad-line: #313936;
        --ad-accent: #A3AEFF;
        --ad-accent-ink: #141817;
        --ad-red: #FF6B5C;
        --ad-soft: #252C2A;
        --ad-shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 30px -20px rgba(0, 0, 0, .9);
        color-scheme: dark;
    }
}

:root[data-theme="dark"] {
    --ad-wall: #141817;
    --ad-paper: #1D2321;
    --ad-ink: #E6E9E3;
    --ad-mute: #9DA8A2;
    --ad-line: #313936;
    --ad-accent: #A3AEFF;
    --ad-accent-ink: #141817;
    --ad-red: #FF6B5C;
    --ad-soft: #252C2A;
    --ad-shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 30px -20px rgba(0, 0, 0, .9);
    color-scheme: dark;
}

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

html, body {
    margin: 0;
    background: var(--ad-wall);
}

.ad-site {
    min-height: 100vh;
    background: var(--ad-wall);
    color: var(--ad-ink);
    font-family: var(--ad-sans);
    font-size: 16px;
    line-height: 1.5;
}

.ad-site h1, .ad-site h2 {
    margin: 0;
    font-family: var(--ad-serif);
    font-weight: 400;
}

.ad-site a {
    color: var(--ad-accent);
}

.ad-mark {
    flex: none;
}

.ad-ibtn {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--ad-line);
    border-radius: 50%;
    background: transparent;
    color: var(--ad-ink);
    cursor: pointer;
}

.ad-ibtn:hover {
    border-color: var(--ad-accent);
    color: var(--ad-accent);
}

.ad-sun {
    display: none;
}

:root[data-theme="dark"] .ad-sun {
    display: block;
}

:root[data-theme="dark"] .ad-moon {
    display: none;
}

.ad-main {
    display: grid;
    place-items: center;
    min-height: 100vh;
    padding: 24px 16px;
}

.ad-card {
    width: min(420px, 100%);
    padding: 28px 28px 24px;
    border: 1px solid var(--ad-line);
    border-radius: 16px;
    background: var(--ad-paper);
    box-shadow: var(--ad-shadow);
}

.ad-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}

.ad-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--ad-ink) !important;
    text-decoration: none;
    font-family: var(--ad-serif);
    font-size: 20px;
}

.ad-card h1 {
    font-size: 32px;
    line-height: 1.15;
}

.ad-lead {
    margin: 8px 0 24px;
    color: var(--ad-mute);
}

.ad-form {
    display: grid;
    gap: 8px;
}

.ad-hide {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.ad-label {
    font-weight: 600;
    font-size: 15px;
}

.ad-input {
    width: 100%;
    min-height: 48px;
    padding: 10px 14px;
    border: 1px solid var(--ad-line);
    border-radius: 10px;
    background: var(--ad-wall);
    color: var(--ad-ink);
    font: inherit;
}

.ad-input:focus {
    outline: 2px solid var(--ad-accent);
    outline-offset: 1px;
    border-color: transparent;
}

.ad-err {
    min-height: 22px;
    margin: 0;
    color: var(--ad-red);
    font-size: 15px;
}

.ad-btn {
    min-height: 48px;
    border: 0;
    border-radius: 999px;
    background: var(--ad-accent);
    color: var(--ad-accent-ink);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.ad-btn:hover {
    filter: brightness(1.1);
}

.ad-back {
    display: inline-block;
    margin-top: 20px;
    font-size: 15px;
}