:root {
    color-scheme: light;
    --bg: #f4f6fb;
    --surface: #ffffff;
    --border: #dbe3ef;
    --text: #0f172a;
    --text-muted: #64748b;
    --accent: #4f46e5;
    --accent-soft: #eef2ff;
    --danger: #dc2626;
    --radius: 3px;
    font-family: "DM Sans", system-ui, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 180px);
}

button,
input {
    font: inherit;
}

.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1.5rem;
}

.auth-card {
    width: min(420px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    padding: 1.5rem;
}

.auth-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.auth-mark {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    object-fit: contain;
}

.auth-brand h1 {
    margin: 0;
    font-size: 1.35rem;
}

.auth-brand p {
    margin: 0.15rem 0 0;
    color: var(--text-muted);
    font-size: 0.88rem;
}

.auth-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
    padding: 0.25rem;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.auth-tab {
    border: 0;
    background: transparent;
    border-radius: var(--radius);
    padding: 0.55rem 0.75rem;
    cursor: pointer;
    color: var(--text-muted);
    font-weight: 600;
}

.auth-tab.is-active {
    background: var(--surface);
    color: var(--accent);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.auth-form {
    display: grid;
    gap: 0.85rem;
}

.auth-form label {
    display: grid;
    gap: 0.35rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.auth-form input {
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    background: #fff;
}

.auth-form input:focus {
    outline: 2px solid rgba(79, 70, 229, 0.25);
    border-color: rgba(79, 70, 229, 0.45);
}

.primary-btn {
    border: 0;
    border-radius: var(--radius);
    background: var(--accent);
    color: #fff;
    padding: 0.7rem 1rem;
    font-weight: 700;
    cursor: pointer;
}

.primary-btn:hover {
    filter: brightness(1.05);
}

.auth-submit {
    margin-top: 0.25rem;
}

.auth-error {
    margin: 0;
    color: var(--danger);
    font-size: 0.88rem;
}

.auth-hint {
    margin: 1rem 0 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    text-align: center;
}

.auth-hint code {
    font-size: 0.8em;
    background: #f1f5f9;
    padding: 0.1rem 0.35rem;
    border-radius: var(--radius);
}

.hidden {
    display: none !important;
}