/* CSS Variables */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --background-color: #f5f6fa;
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --gradient-start: #4a90e2;
    --gradient-end: #2c3e50;
}

/* Dark Mode Variables */
body.dark-mode {
    --primary-color: #64b5f6;
    --secondary-color: #34495e;
    --accent-color: #ff6b6b;
    --background-color: #1a1a1a;
    --text-color: #ecf0f1;
    --card-bg: #2d2d2d;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --gradient-start: #2c3e50;
    --gradient-end: #1a1a1a;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

/* Language Selector */
.language-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    z-index: 1000;
}

.lang-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 5px;
    transition: var(--transition);
}

.lang-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Login Container */
.login-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.login-container>div {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    animation: fadeIn 0.8s ease;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-color);
    opacity: 0.8;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--card-bg);
    color: var(--text-color);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.login-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.login-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

/* Error Message */
.error-message {
    background: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    text-align: center;
    animation: shake 0.5s ease;
}

/* Login Footer */
.login-footer {
    text-align: center;
    margin-top: 2rem;
}

.login-footer p {
    margin: 0.5rem 0;
    color: var(--text-color);
    opacity: 0.8;
}

.login-footer p:hover {
    color: var(--primary-color);
    cursor: pointer;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .login-container {
        padding: 1rem;
    }

    .login-container>div {
        padding: 2rem;
    }

    .language-selector {
        top: 10px;
        right: 10px;
    }

    .login-header h1 {
        font-size: 1.8rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #1a1a1a;
        --text-color: #ffffff;
        --card-bg: #2d2d2d;
    }
}

.logout-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.logout-button:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}