/* Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #1a8cff;
    --primary-dark: #0073e6;
    --primary-light: #e6f2ff;
    --text-dark: #2c3e50;
    --text-light: #718096;
    --bg-color: #f7fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --success-color: #38a169;
    --error-color: #e53e3e;
    --radius: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
nav {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    width: 100%;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 40px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links a {
    color: var(--text-dark);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 16px;
    font-weight: 500;
    margin-left: 10px;
}

.nav-links a:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.nav-links a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Auth Container */
.auth-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.auth-box {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 500px;
    overflow: hidden;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab {
    flex: 1;
    text-align: center;
    padding: 15px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-light);
    transition: var(--transition);
}

.tab.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab:hover {
    background-color: var(--primary-light);
}

/* Forms */
.form-container {
    padding: 30px;
}

.auth-form {
    display: none;
}

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

.form-subtitle {
    color: var(--text-light);
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.form-group small {
    display: block;
    color: var(--text-light);
    margin-top: 5px;
    font-size: 14px;
}

.form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.remember-me {
    display: flex;
    align-items: center;
}

.remember-me input {
    margin-right: 5px;
}

.forgot-password {
    color: var(--primary-color);
    font-size: 14px;
}

/* Alerts */
.alert {
    padding: 10px 15px;
    margin-bottom: 20px;
    border-radius: var(--radius);
    display: none;
}

.alert.error {
    display: block;
    background-color: rgba(229, 62, 62, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.alert.success {
    display: block;
    background-color: rgba(56, 161, 105, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 16px;
}

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

.btn-block {
    display: block;
    width: 100%;
}

/* Footer */
footer {
    padding: 15px 0;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
    }
    
    .auth-box {
        max-width: 100%;
    }
    
    .form-footer {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .forgot-password {
        margin-top: 10px;
    }
}