:root {
    --color-primary: #2367B0;
    --color-primary-dark: #1a4f8a;
    --color-secondary: #D24333;
    --color-white: #FFFFFF;
    --color-light-gray: #f5f7fa;
    --color-gray: #6c757d;
    --color-dark: #333333;
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    padding: 1rem;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--color-white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    padding: 2rem;
    text-align: center;
}

.login-logo {
    width: 260px;
    height: auto;
    object-fit: contain;
    margin-bottom: 1rem;
}

.login-title {
    color: var(--color-white);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.login-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.login-body {
    padding: 2rem;
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-dark);
    font-size: 0.95rem;
}

.form-input {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(35, 103, 176, 0.15);
}

.form-input::placeholder {
    color: #aaa;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray);
    font-size: 1.1rem;
}

.form-input.with-icon {
    padding-left: 2.8rem;
}

.toggle-password {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-gray);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.3rem;
    transition: var(--transition);
}

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

.btn-login {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-login:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.btn-login.loading {
    position: relative;
    color: transparent;
}

.btn-login.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: none;
    animation: shake 0.3s ease;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.login-footer {
    text-align: center;
    padding: 1rem 2rem 2rem;
    border-top: 1px solid #eee;
}

.login-footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.login-footer a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--color-white);
}

/* Responsive */
@media (max-width: 480px) {
    .login-header {
        padding: 1.5rem;
    }

    .login-logo {
        width: 200px;
    }

    .login-title {
        font-size: 1.1rem;
    }

    .login-body {
        padding: 1.5rem;
    }
}