:root {
    --auth-bg: #f2f4f7;
    --auth-card-bg: #ffffff;
    --auth-text: #1c1d21;
    --auth-muted: #6b7280;
    --auth-border: #d7dbe3;
    --auth-primary: #0f766e;
    --auth-primary-hover: #0d625b;
    --auth-error: #b42318;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: radial-gradient(circle at 20% 20%, #d7f3ef 0%, var(--auth-bg) 45%, #e8eef8 100%);
    color: var(--auth-text);
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 460px;
    background: var(--auth-card-bg);
    border: 1px solid var(--auth-border);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

.auth-header h1 {
    margin: 0;
    font-size: 1.55rem;
}

.auth-header p {
    margin: 6px 0 0;
    color: var(--auth-muted);
}

.auth-tabs {
    margin: 18px 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.auth-tab {
    text-decoration: none;
    border: 1px solid var(--auth-border);
    color: var(--auth-text);
    text-align: center;
    border-radius: 10px;
    padding: 10px 12px;
    font-weight: 600;
}

.auth-tab.active {
    border-color: var(--auth-primary);
    background: #e7f7f5;
    color: #0b4c47;
}

.auth-form {
    display: grid;
    gap: 10px;
}

.auth-form.hidden {
    display: none;
}

.auth-form label {
    font-size: 0.92rem;
    font-weight: 600;
}

.auth-form input {
    height: 44px;
    border: 1px solid var(--auth-border);
    border-radius: 10px;
    padding: 0 12px;
    font-size: 0.95rem;
}

.auth-form input:focus {
    outline: 2px solid rgba(15, 118, 110, 0.2);
    border-color: var(--auth-primary);
}

.auth-form button {
    margin-top: 8px;
    height: 44px;
    border: 0;
    border-radius: 10px;
    background: var(--auth-primary);
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
}

.auth-form button:hover {
    background: var(--auth-primary-hover);
}

.auth-message {
    min-height: 20px;
    margin-top: 14px;
    font-weight: 600;
    color: var(--auth-error);
}

.auth-message.ok {
    color: #087443;
}