:root {
    color-scheme: dark;
    --background: #07131d;
    --panel: #0d1e2b;
    --input: #07131d;
    --text: #f2f7fa;
    --muted: #9db0bd;
    --line: #294353;
    --accent: #44d3f4;
    --accent-hover: #80e2f8;
    /* Backward-compatible portal/coursework color names. */
    --ink: var(--text);
    --cyan: var(--accent);
    --cyan-soft: var(--accent-hover);
    --danger: #ff98a7;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background: var(--background);
    color: var(--text);
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover,
a:focus-visible {
    color: #fff;
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem 1rem;
}

.auth-panel {
    width: min(100%, 28rem);
}

.site-name {
    margin: 0 0 1rem;
    color: var(--muted);
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: .08em;
    text-align: center;
    text-transform: uppercase;
}

.auth-card {
    padding: clamp(1.5rem, 5vw, 2.25rem);
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: var(--panel);
    box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, .28);
}

.auth-card h1,
.auth-card h2 {
    margin: 0;
    font-size: clamp(1.8rem, 8vw, 2.35rem);
    line-height: 1.15;
    letter-spacing: -.035em;
}

.eyebrow {
    margin: 0 0 .65rem;
    color: var(--accent);
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .13em;
}

.form-intro {
    margin: .7rem 0 1.75rem;
    color: var(--muted);
    line-height: 1.55;
}

.field {
    margin: 1rem 0;
}

.field label {
    display: block;
    margin-bottom: .45rem;
    font-size: .86rem;
    font-weight: 700;
}

.field input {
    width: 100%;
    min-height: 3rem;
    padding: .8rem .9rem;
    border: 1px solid var(--line);
    border-radius: .65rem;
    outline: none;
    background: var(--input);
    color: #fff;
    font: inherit;
}

.field input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(68, 211, 244, .13);
}

.field-error {
    margin: .4rem 0 0;
    color: var(--danger);
    font-size: .82rem;
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin: 1.2rem 0;
    color: var(--muted);
    font-size: .86rem;
}

.check-row {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
}

.check-row input {
    accent-color: var(--accent);
}

.primary-action,
.logout-button {
    width: 100%;
    min-height: 3rem;
    border-radius: .65rem;
    font-family: inherit;
    font-size: .95rem;
    font-weight: 800;
    cursor: pointer;
}

.primary-action {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1.4rem;
    padding: .8rem 1rem;
    border: 0;
    background: var(--accent);
    color: #05131c;
}

.primary-action:hover,
.primary-action:focus-visible {
    background: var(--accent-hover);
}

.back-link {
    display: inline-block;
    margin-top: 1.25rem;
    font-size: .88rem;
}

.status-message {
    margin-bottom: 1rem;
    padding: .8rem .9rem;
    border: 1px solid #286350;
    border-radius: .65rem;
    background: rgba(24, 100, 74, .18);
    color: #9cf4cb;
}

.logout-action {
    display: block;
    width: 100%;
    margin-top: 1rem;
}

.logout-button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: .8rem 1rem;
    border: 1px solid var(--line);
    background: var(--input);
    color: var(--accent);
}

.logout-button:hover,
.logout-button:focus-visible {
    border-color: var(--accent);
    color: #fff;
}

@media (max-width: 520px) {
    .auth-shell {
        align-items: start;
        padding-top: 3rem;
    }

    .form-options {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}