/* Đăng nhập / Đăng ký (Supabase Auth). Tách từ login.html (inline cũ).
   Dùng .form-field/.form-input/.form-label chung từ style.css. */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    background: var(--bg-primary);
    position: relative;
}

.auth-theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 5px 10px;
    line-height: 1.4;
    transition: var(--transition);
    font-family: inherit;
}
.auth-theme-toggle:hover { border-color: var(--text-secondary); color: var(--text-primary); }

.auth-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}
.auth-logo-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
}
.auth-logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}
.auth-logo p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0.25rem 0 0;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.75rem;
}
.auth-tab {
    flex: 1;
    padding: 0.625rem;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}
.auth-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

.btn-auth {
    width: 100%;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    font-family: inherit;
    transition: var(--transition);
}
.btn-auth:active { transform: scale(0.98); }
.btn-auth:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary-auth {
    background: var(--primary);
    color: var(--bg-primary);
    border-color: var(--primary);
}
.btn-primary-auth:hover:not(:disabled) { opacity: 0.85; }

.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    margin-top: 0.75rem;
}
.btn-google:hover:not(:disabled) { background: var(--bg-tertiary); }
.btn-google svg { flex-shrink: 0; }

.divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.25rem 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}
.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.auth-msg {
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: none;
}
.auth-msg.error {
    background: var(--danger-soft);
    color: var(--danger);
    border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
    display: block;
}
.auth-msg.success {
    background: var(--secondary-soft);
    color: var(--secondary);
    border: 1px solid color-mix(in srgb, var(--secondary) 30%, transparent);
    display: block;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.auth-footer a {
    color: var(--primary);
    text-decoration: none;
}
.auth-footer a:hover { text-decoration: underline; }

.auth-supabase-missing {
    background: var(--warn-soft);
    border: 1px solid color-mix(in srgb, var(--warn) 30%, transparent);
    border-radius: var(--radius-sm);
    padding: 0.875rem;
    font-size: 0.82rem;
    color: var(--warn);
    margin-bottom: 1.25rem;
    display: none;
}