/* =============================================
   RESET & BASE STYLES
   ============================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #333;
    background-color: #f5f7fa;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* =============================================
   HEADER STYLES
   ============================================= */
.site-header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    gap: 20px;
}

/* Logo Styles */
.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 10px;
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Navigation Menu */
.main-nav {
    flex: 1;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    justify-content: center;
}

.nav-link {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    padding: 8px 0;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link i {
    margin-right: 8px;
    font-size: 16px;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link.active {
    color: #667eea;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 3px;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-login {
    background-color: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-login:hover {
    background-color: #667eea;
    color: #fff;
    transform: translateY(-2px);
}

.btn-register {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.3s ease;
    color: #555;
}

.dark-mode-toggle:hover {
    background-color: #f0f0f0;
    transform: rotate(15deg);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    color: #555;
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100%;
    background-color: #fff;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1002;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
    font-weight: 600;
    font-size: 18px;
}

.close-mobile-menu {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: #999;
}

.mobile-nav-menu {
    list-style: none;
    padding: 20px;
}

.mobile-nav-menu li {
    margin-bottom: 15px;
}

.mobile-nav-link {
    text-decoration: none;
    color: #555;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.mobile-nav-link:hover {
    background-color: #f5f7fa;
    color: #667eea;
}

.mobile-divider {
    margin: 20px 0;
    border: none;
    border-top: 1px solid #e0e0e0;
}

.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    display: none;
}

.mobile-overlay.active {
    display: block;
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

/* =============================================
   PRELOADER
   ============================================= */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.preloader.hide {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .btn-login, .btn-register {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    .logo-text {
        font-size: 18px;
    }
    
    .logo-img {
        height: 30px;
    }
    
    .header-actions {
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .btn-login span, .btn-register span {
        display: none;
    }
    
    .btn-login i, .btn-register i {
        margin: 0;
    }
    
    .btn-login, .btn-register {
        padding: 8px 12px;
    }
}