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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-light: #ecf0f1;
    --text-dark: #333;
    --border-radius: 4px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: var(--text-dark);
    line-height: 1.6;
}

/* ===== NAVBAR STYLES ===== */
.navbar {
    background-color: var(--primary-color);
    padding: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 15px;
    height: auto;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 0;
    flex: 0 1 auto;
}

.nav-brand {
    font-size: 24px;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
    padding: 15px 20px;
    display: block;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-brand:hover {
    background-color: var(--secondary-color);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    gap: 5px;
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background-color: var(--text-light);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Navigation Menu */
.nav-middle {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
    gap: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    padding: 20px 18px;
    transition: var(--transition);
    font-size: 15px;
    font-weight: 500;
}

.nav-link:hover {
    background-color: var(--secondary-color);
    color: #fff;
}

/* Dropdown Arrow */
.dropdown-arrow {
    font-size: 10px;
    margin-left: 5px;
    display: inline-block;
    transition: var(--transition);
}

.dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--secondary-color);
    list-style: none;
    padding: 0;
    margin: 0;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    border-top: 3px solid var(--accent-color);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-link {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    padding: 12px 20px;
    transition: var(--transition);
    font-size: 14px;
}

.dropdown-link:hover {
    background-color: var(--primary-color);
    padding-left: 28px;
}

.dropdown:hover > .dropdown-toggle {
    background-color: var(--secondary-color);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Right Navigation */
.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 0 1 auto;
    white-space: nowrap;
}

.user-name {
    color: var(--text-light);
    font-size: 13px;
    font-weight: 500;
}

.login-btn {
    padding: 8px 16px;
    background-color: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

.login-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.logout-btn {
    background-color: #e74c3c;
}

.logout-btn:hover {
    background-color: #c0392b;
}

/* ===== MAIN CONTENT ===== */
.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
    min-height: calc(100vh - 250px);
}

.page-title {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 20px;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 10px;
}

.page-content {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.page-content p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.page-content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.page-content li {
    margin-bottom: 10px;
}

/* ===== LOGIN PAGE ===== */
.login-container {
    max-width: 400px;
    margin: 50px auto;
}

.login-form {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group button {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.form-group button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.error-message {
    background-color: #fee;
    color: #c33;
    padding: 12px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid #c33;
}

.success-message {
    background-color: #efe;
    color: #3c3;
    padding: 12px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid #3c3;
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablets (768px to 1024px) */
@media (max-width: 1024px) {
    .nav-container {
        padding: 0 12px;
    }
    
    .nav-brand {
        font-size: 20px;
        padding: 15px 15px;
    }
    
    .nav-link {
        padding: 18px 14px;
        font-size: 14px;
    }
    
    .dropdown-link {
        padding: 10px 16px;
    }
    
    .nav-right {
        gap: 10px;
    }
    
    .user-name {
        font-size: 12px;
    }
    
    .login-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .page-content {
        padding: 20px;
    }
}

/* Mobile (max 768px) */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        gap: 0;
    }
    
    .nav-left {
        width: 100%;
        justify-content: space-between;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-middle {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        flex-basis: 100%;
        order: 3;
    }
    
    .nav-middle.active {
        max-height: 500px;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-link {
        padding: 15px 20px;
        width: 100%;
    }
    
    .nav-right {
        width: 100%;
        justify-content: center;
        gap: 10px;
        padding: 15px 0;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        flex-basis: 100%;
        order: 4;
    }
    
    .user-name {
        width: 100%;
        text-align: center;
        font-size: 12px;
    }
    
    .login-btn {
        width: auto;
        padding: 8px 16px;
    }
    
    /* Mobile Dropdown */
    .dropdown-menu {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, opacity 0.3s ease;
        box-shadow: none;
        background-color: #1a252f;