/* ============================================
   TELA DE LOGIN - MODERNA E TECH
   ============================================ */

#loginScreen {
    display: none;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #0d0d0d;
    position: relative;
    overflow: hidden;
}

#loginScreen.active {
    display: flex;
}

/* Fundo quadriculado suave */
#loginScreen::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(158, 158, 158, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(158, 158, 158, 0.03) 1px, transparent 1px);
    background-size: 24px 24px;
    z-index: 0;
}

.login-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 450px;
    padding: 2rem;
}

.login-card {
    background: rgba(30, 30, 30, 0.95);
    border: 1px solid rgba(255, 215, 0, 0.2);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 215, 0, 0.1) inset;
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.4), transparent);
}

.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.login-header .logo {
    width: 120px;
    height: 120px;
    margin-bottom: 0;
    display: block;
    filter: drop-shadow(0 0 24px rgba(255, 215, 0, 0.2));
    animation: logoSubtle 4s ease-in-out infinite;
}

@keyframes logoSubtle {
    0%, 100% { transform: translateY(0) scale(1); opacity: 1; }
    50% { transform: translateY(-4px) scale(1.02); opacity: 0.98; }
}

.login-form {
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    letter-spacing: 0.3px;
}

.form-group input {
    width: 100%;
    padding: 1rem 1.25rem;
    background: rgba(20, 20, 20, 0.8);
    border: 2px solid rgba(255, 215, 0, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(20, 20, 20, 0.95);
    box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.1);
}

.password-input-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.3s;
}

.password-toggle:hover {
    color: var(--primary);
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, #ffd700 100%);
    border: none;
    border-radius: 12px;
    color: #000;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.error-message {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(220, 53, 69, 0.15);
    border: 1px solid rgba(220, 53, 69, 0.3);
    border-radius: 12px;
    color: #ff6b6b;
    font-size: 0.9rem;
    display: none;
    animation: slideDown 0.3s ease;
}

.error-message.show {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsivo */
@media (max-width: 768px) {
    .login-card {
        padding: 2rem 1.5rem;
    }
    
    .login-header .logo {
        width: 100px;
        height: 100px;
    }
}