/* ==================== مودال احراز هویت ==================== */
.auth-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.auth-overlay.active {
    opacity: 1;
    visibility: visible;
}

.auth-modal {
    background: var(--card-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), var(--glow);
    transform: translateY(20px) scale(0.96);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.auth-overlay.active .auth-modal {
    transform: translateY(0) scale(1);
}

/* درخشش بالای مودال */
.auth-modal::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.15), transparent 50%);
    pointer-events: none;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
    position: relative;
}

.auth-logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.auth-logo span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-header h2 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* تب‌ها */
.auth-tabs {
    display: flex;
    background: var(--bg-color);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 24px;
    position: relative;
    border: 1px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 9px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.auth-tab.active {
    color: #ffffff;
    background: var(--primary-gradient);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* فرم */
.auth-form {
    display: none;
    flex-direction: column;
    gap: 16px;
    animation: fadeIn 0.3s ease forwards;
}

.auth-form.active {
    display: flex;
}

.auth-form .form-group {
    margin-bottom: 0;
}

.auth-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.auth-form input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.auth-form input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.auth-submit {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    font-family: var(--font-family);
    margin-top: 8px;
}

.auth-submit:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.auth-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* پیام خطا */
.auth-error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    display: none;
    animation: shake 0.4s ease;
}

.auth-error.active {
    display: block;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* کاربر در سایدبار */
.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logout-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
}

.logout-btn:hover {
    color: #ef4444;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.08);
}

@media (max-width: 480px) {
    .auth-modal {
        padding: 28px 24px;
        border-radius: 20px;
    }
    .auth-logo { font-size: 1.3rem; }
    .auth-header h2 { font-size: 1.15rem; }
}