:root {
    color-scheme: light;
    --bg: #f4f6f9;
    --surface: #ffffff;
    --border: #e2e6ec;
    --text: #1c2333;
    --text-muted: #6b7280;
    --primary: #2f6feb;
    --primary-hover: #2558c4;
    --primary-contrast: #ffffff;
    --success: #1c9d6f;
    --danger: #d84343;
    --warning: #b7791f;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 12px rgba(16, 24, 40, .06);
    font-size: 16px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    padding: 24px 16px;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 28px;
}

.auth-card h1 {
    font-size: 1.3rem;
    margin: 0 0 4px;
}

.auth-card__hint {
    color: var(--text-muted);
    font-size: .9rem;
    margin: 0 0 20px;
}

.field { margin-bottom: 14px; }

.field label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    font-size: 1rem;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
}

input:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
}

.field-hint {
    color: var(--text-muted);
    font-size: .82rem;
    margin: 6px 0 0;
}

.field-error {
    background: rgba(216, 67, 67, .08);
    color: var(--danger);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: .9rem;
    margin: 0 0 14px;
}

.field-success {
    background: rgba(28, 157, 111, .1);
    color: var(--success);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: .9rem;
    margin: 0 0 14px;
}

.btn {
    appearance: none;
    border: none;
    border-radius: var(--radius-md);
    font-size: .95rem;
    font-weight: 600;
    padding: 13px 18px;
    cursor: pointer;
    transition: background .12s ease, transform .06s ease;
    width: 100%;
}

.btn:active { transform: scale(.98); }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

.btn--primary { background: var(--primary); color: var(--primary-contrast); }
.btn--primary:hover { background: var(--primary-hover); }

.auth-card__footer {
    text-align: center;
    margin-top: 18px;
    font-size: .9rem;
    color: var(--text-muted);
}

.auth-card__footer a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.auth-card__footer a:hover { text-decoration: underline; }