:root {
    --color-bg: #0f172a;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-muted: #64748b;
    --color-accent: #0ea5e9;
    --color-accent-dark: #0284c7;
    --color-error-bg: #fef2f2;
    --color-error-text: #b91c1c;
    --color-border: #e2e8f0;
    --radius: 10px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--color-text);
    background: #f8fafc;
}

/* --- Login page --- */

body.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, var(--color-bg) 0%, #1e293b 100%);
    padding: 1.5rem;
}

.auth-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

.auth-title {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.auth-subtitle {
    margin: 0 0 1.5rem;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.auth-error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
    padding: 0.65rem 0.85rem;
    border-radius: 8px;
    font-size: 0.85rem;
    margin: 0 0 1.25rem;
}

.auth-notice {
    background: #fffbeb;
    color: #92400e;
    padding: 0.65rem 0.85rem;
    border-radius: 8px;
    font-size: 0.85rem;
}

form label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-muted);
    margin: 1rem 0 0.35rem;
}

form input[type="text"],
form input[type="password"] {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
}

form input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.password-field {
    position: relative;
    display: flex;
}

.password-field input {
    flex: 1;
}

.toggle-password {
    margin-left: 0.5rem;
    padding: 0 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: #f1f5f9;
    color: var(--color-muted);
    font-size: 0.8rem;
    cursor: pointer;
}

form button[type="submit"] {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.7rem;
    border: none;
    border-radius: 8px;
    background: var(--color-accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease;
}

form button[type="submit"]:hover {
    background: var(--color-accent-dark);
}

form button[type="submit"]:disabled {
    opacity: 0.7;
    cursor: default;
}

/* --- Placeholder shell (post-login) --- */

.shell-placeholder {
    max-width: 640px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.placeholder-note {
    color: var(--color-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.logout-link {
    display: inline-block;
    margin-top: 1.5rem;
    color: var(--color-accent-dark);
    font-weight: 600;
    text-decoration: none;
}

.logout-link:hover {
    text-decoration: underline;
}