:root {
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #e0e0e0;
    --input-bg: #f9f9f9;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --button-gradient-start: #667eea;
    --button-gradient-end: #764ba2;
}

body.dark-mode {
    --bg-gradient-start: #1a1a2e;
    --bg-gradient-end: #16213e;
    --card-bg: #0f3460;
    --text-primary: #e8e8e8;
    --text-secondary: #b8b8b8;
    --text-light: #8a8a8a;
    --border-color: #1e4a6f;
    --input-bg: #1a3a52;
    --shadow: rgba(0, 0, 0, 0.5);
    --shadow-light: rgba(0, 0, 0, 0.3);
    --button-gradient-start: #e94560;
    --button-gradient-end: #f5576c;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    direction: rtl;
    transition: background 0.3s ease;
}

.login-container {
    width: 100%;
    max-width: 450px;
}

.login-box {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 20px 60px var(--shadow);
    padding: 40px;
    animation: slideUp 0.5s ease-out;
    transition: all 0.3s ease;
}

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

.logo-section {
    text-align: center;
    margin-bottom: 40px;
}

.logo-section h1 {
    color: var(--bg-gradient-start);
    font-size: 42px;
    font-weight: bold;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px var(--shadow-light);
    transition: color 0.3s ease;
}

.logo-section p {
    color: var(--text-secondary);
    font-size: 16px;
    transition: color 0.3s ease;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.form-group select,
.form-group input[type="password"] {
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s ease;
    background-color: var(--input-bg);
    color: var(--text-primary);
    outline: none;
}

.form-group select:focus,
.form-group input[type="password"]:focus {
    border-color: var(--bg-gradient-start);
    background-color: var(--card-bg);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: left 10px center;
    background-size: 20px;
    padding-left: 35px;
    color: var(--text-primary) !important;
}

.password-input {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input input {
    width: 100%;
    padding-left: 50px;
}

.toggle-password {
    position: absolute;
    left: 15px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    padding: 5px;
    display: flex;
    align-items: center;
    transition: opacity 0.3s;
}

.toggle-password:hover {
    opacity: 0.7;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    margin-top: -5px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.remember-me input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.forgot-password {
    color: var(--bg-gradient-start);
    text-decoration: none;
    transition: color 0.3s;
}

.forgot-password:hover {
    color: var(--bg-gradient-end);
    text-decoration: underline;
}

.login-btn {
    background: linear-gradient(135deg, var(--button-gradient-start) 0%, var(--button-gradient-end) 100%);
    color: white;
    border: none;
    padding: 15px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

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

.footer-text {
    text-align: center;
    margin-top: 30px;
    color: var(--text-light);
    font-size: 13px;
    transition: color 0.3s ease;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px var(--shadow-light);
    transition: all 0.3s ease;
    z-index: 10000;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px var(--shadow);
}

.theme-toggle i {
    transition: transform 0.3s ease;
}

.theme-toggle:hover i {
    transform: rotate(20deg);
}

/* Responsive Design */
@media (max-width: 480px) {
    .login-box {
        padding: 30px 25px;
    }

    .logo-section h1 {
        font-size: 36px;
    }

    .form-options {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
}

/* Alert Messages */
.alert {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    animation: slideDown 0.3s ease-out;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}