/*
===============================================
ELECTROVIGIA - Main CSS (Starlink Style Design System)
===============================================
*/

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Colors - Starlink Inspired Palette */
    --color-black: #000000;
    --color-black-light: #0a0a0a;
    --color-gray-900: #1a1a1a;
    --color-gray-800: #2a2a2a;
    --color-gray-700: #333333;
    --color-gray-600: #4a4a4a;
    --color-gray-500: #666666;
    --color-gray-400: #999999;
    --color-gray-300: #b0b0b0;
    --color-gray-200: #e0e0e0;
    --color-gray-100: #f5f5f5;
    --color-white: #ffffff;
    
    /* Accent Colors */
    --color-primary: #0099ff;
    --color-primary-dark: #0077cc;
    --color-primary-light: #33aaff;
    --color-secondary: #00ffaa;
    --color-secondary-dark: #00cc88;
    --color-warning: #ffaa00;
    --color-error: #ff4444;
    --color-success: #00ff88;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #0099ff, #00ffaa);
    --gradient-hero: linear-gradient(135deg, rgba(0, 153, 255, 0.1), rgba(0, 255, 170, 0.1));
    --gradient-card: linear-gradient(135deg, rgba(26, 26, 26, 0.8), rgba(42, 42, 42, 0.8));
    
    /* Typography */
    --font-family-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 4rem;        /* 64px */
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    --font-weight-black: 900;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.6;
    --line-height-loose: 1.8;
    
    /* Spacing */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(0, 153, 255, 0.3);
    --shadow-glow-secondary: 0 0 20px rgba(0, 255, 170, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-mobile-menu: 1060;
    --z-tooltip: 1070;
    
    /* Breakpoints */
    --breakpoint-sm: 768px;
    --breakpoint-md: 1024px;
    --breakpoint-lg: 1280px;
    --breakpoint-xl: 1440px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-white);
    background-color: var(--color-black);
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(0, 153, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(0, 255, 170, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: 80px; /* Account for fixed navbar */
}

/* Adjust padding for different screen sizes */
@media (max-width: 768px) {
    body {
        padding-top: 70px; /* Smaller padding on mobile */
    }
}

/* Page Loader */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-black);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-logo img {
    width: 64px;
    height: auto;
    margin-bottom: var(--space-4);
    opacity: 0.8;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 2px solid var(--color-gray-800);
    border-top: 2px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.025em;
    margin-bottom: var(--space-4);
    color: var(--color-white);
}

h1 { font-size: var(--font-size-5xl); font-weight: var(--font-weight-extrabold); }
h2 { font-size: var(--font-size-4xl); font-weight: var(--font-weight-bold); }
h3 { font-size: var(--font-size-3xl); font-weight: var(--font-weight-bold); }
h4 { font-size: var(--font-size-2xl); font-weight: var(--font-weight-semibold); }
h5 { font-size: var(--font-size-xl); font-weight: var(--font-weight-semibold); }
h6 { font-size: var(--font-size-lg); font-weight: var(--font-weight-medium); }

@media (max-width: 768px) {
    h1 { font-size: var(--font-size-4xl); }
    h2 { font-size: var(--font-size-3xl); }
    h3 { font-size: var(--font-size-2xl); }
    h4 { font-size: var(--font-size-xl); }
}

p {
    margin-bottom: var(--space-4);
    color: var(--color-gray-200);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

/* Layout Utilities */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 var(--space-5);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: var(--z-fixed);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(0, 0, 0, 0.95);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
    max-width: 1400px;
    margin: 0 auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
    height: 80px;
}

@media (max-width: 768px) {
    .nav-container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
        height: 70px;
        padding: var(--space-3) var(--space-4);
    }
}

.nav-logo {
    display: flex;
    align-items: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: var(--color-white);
    z-index: var(--z-dropdown);
    position: relative;
}

.nav-logo a {
    display: flex;
    align-items: center;
    color: var(--color-white);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.nav-logo a:hover {
    transform: scale(1.02);
}

.logo-img {
    height: 32px;
    width: auto;
    margin-right: var(--space-2);
    max-width: 120px;
    object-fit: contain;
}

@media (max-width: 768px) {
    .logo-img {
        height: 28px;
        max-width: 100px;
    }
}

@media (max-width: 480px) {
    .logo-img {
        height: 24px;
        max-width: 80px;
    }
}

.logo-text {
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-list {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--space-6);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    color: var(--color-gray-200);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.05);
    text-decoration: none;
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 80%;
}

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

.dropdown-toggle i {
    margin-left: var(--space-1);
    font-size: 0.8em;
    transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 250px;
    padding: var(--space-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: var(--z-dropdown);
}

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

.dropdown-menu li {
    list-style: none;
}

.dropdown-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    color: var(--color-gray-200);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.dropdown-link:hover {
    background: rgba(0, 153, 255, 0.1);
    color: var(--color-white);
    text-decoration: none;
}

.dropdown-link i {
    margin-right: var(--space-2);
    width: 16px;
    text-align: center;
    color: var(--color-primary);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    margin: 2px 0;
    transition: all var(--transition-normal);
    transform-origin: center;
}

.nav-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Search */
.nav-search {
    display: flex;
    align-items: center;
}

.search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-toggle:hover {
    background: rgba(0, 153, 255, 0.2);
    transform: scale(1.05);
}

/* Search Modal */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 10vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.search-modal-content {
    position: relative;
    background: var(--color-gray-900);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
}

.search-modal.active .search-modal-content {
    transform: translateY(0);
}

.search-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.search-modal-header h3 {
    margin: 0;
    font-size: var(--font-size-xl);
}

.search-modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    color: var(--color-gray-400);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.search-modal-close:hover {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

.search-modal-body {
    padding: var(--space-6);
}

/* Search Form */
.search-form {
    margin-bottom: var(--space-6);
}

.search-input-group {
    position: relative;
    margin-bottom: var(--space-4);
}

.search-input {
    width: 100%;
    padding: var(--space-4) var(--space-12) var(--space-4) var(--space-4);
    background: var(--color-gray-800);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 153, 255, 0.1);
}

.search-input::placeholder {
    color: var(--color-gray-400);
}

.search-submit {
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
    transform: translateY(-50%) scale(1.05);
}

/* Search Filters */
.search-filters {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.search-filter {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.search-filter input[type="radio"] {
    display: none;
}

.search-filter span {
    padding: var(--space-2) var(--space-4);
    background: var(--color-gray-800);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-gray-300);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.search-filter input[type="radio"]:checked + span {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.search-filter:hover span {
    background: rgba(0, 153, 255, 0.1);
    color: var(--color-white);
}

/* Mobile Responsive Navigation */
@media (max-width: 1024px) {
    .nav-toggle {
        display: flex;
        z-index: calc(var(--z-mobile-menu) + 1);
        position: relative;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--color-black);
        border: none;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 100px;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: var(--z-mobile-menu);
        overflow-y: auto;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
        width: 100%;
        padding: 0 var(--space-6);
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-link {
        font-size: var(--font-size-lg);
        padding: var(--space-6) var(--space-4);
        width: 100%;
        justify-content: center;
        text-transform: none;
        font-weight: var(--font-weight-medium);
        border-radius: 0;
        letter-spacing: 0;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: var(--color-gray-900);
        color: var(--color-primary);
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: var(--color-gray-900);
        border: none;
        box-shadow: none;
        margin: 0;
        border-radius: 0;
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .dropdown:hover .dropdown-menu,
    .dropdown.active .dropdown-menu {
        max-height: 300px;
    }
    
    .dropdown-link {
        padding: var(--space-4) var(--space-6);
        font-size: var(--font-size-base);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .nav-search {
        margin-top: var(--space-8);
        padding: 0 var(--space-6);
        width: 100%;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn i {
    margin-right: var(--space-2);
    font-size: 1.1em;
}

.btn:last-child i {
    margin-right: 0;
    margin-left: var(--space-2);
}

/* Button Variants */
.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 30px rgba(0, 153, 255, 0.4);
    text-decoration: none;
    color: var(--color-white);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--color-white);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    text-decoration: none;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 80px;
    right: var(--space-6);
    z-index: var(--z-tooltip);
    max-width: 400px;
}

.flash-message {
    display: flex;
    align-items: center;
    padding: var(--space-4);
    margin-bottom: var(--space-2);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    animation: slideInRight 0.3s ease;
}

.flash-message.flash-success {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.3);
}

.flash-message.flash-error {
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid rgba(255, 68, 68, 0.3);
}

.flash-message.flash-info {
    background: rgba(0, 153, 255, 0.1);
    border: 1px solid rgba(0, 153, 255, 0.3);
}

.flash-content {
    display: flex;
    align-items: center;
    flex: 1;
}

.flash-content i {
    margin-right: var(--space-3);
    font-size: 1.2em;
}

.flash-close {
    background: none;
    border: none;
    color: var(--color-gray-400);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.flash-close:hover {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--color-white);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: var(--shadow-glow);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-gray { color: var(--color-gray-400); }
.text-white { color: var(--color-white); }

.bg-gradient { background: var(--gradient-primary); }
.bg-gray-900 { background: var(--color-gray-900); }
.bg-gray-800 { background: var(--color-gray-800); }

.hidden { display: none; }
.visible { display: block; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive Utilities */
@media (max-width: 768px) {
    .hidden-mobile { display: none; }
    .visible-mobile { display: block; }
}

@media (min-width: 769px) {
    .hidden-desktop { display: none; }
    .visible-desktop { display: block; }
}

/*
===============================================
Authentication Elements
===============================================
*/

/* Header Authentication */
.nav-auth {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-right: 1rem;
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.auth-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.auth-btn i {
    font-size: 1rem;
}

.login-btn {
    color: var(--color-white);
    background: transparent;
    border: 1px solid var(--color-gray-600);
}

.login-btn:hover {
    background: var(--color-gray-800);
    border-color: var(--color-gray-500);
    transform: translateY(-1px);
}

.register-btn {
    color: var(--color-white);
    background: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.register-btn:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.3);
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--color-gray-800);
    border: 1px solid var(--color-gray-600);
    border-radius: var(--radius-md);
    color: var(--color-white);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

.user-menu-toggle:hover {
    background: var(--color-gray-700);
    border-color: var(--color-gray-500);
}

.user-avatar i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.user-name {
    font-weight: 600;
    max-width: 120px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.verification-badge {
    color: var(--color-warning);
    font-size: 0.9rem;
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 200px;
    background: var(--color-gray-800);
    border: 1px solid var(--color-gray-600);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

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

.user-dropdown li {
    list-style: none;
}

.user-dropdown .dropdown-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--color-gray-300);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.user-dropdown .dropdown-link:hover {
    background: var(--color-gray-700);
    color: var(--color-white);
}

.verification-link {
    color: var(--color-warning) !important;
}

.verification-link:hover {
    background: rgba(var(--color-warning-rgb), 0.1) !important;
}

.dropdown-divider {
    height: 1px;
    background: var(--color-gray-600);
    margin: 0.5rem 0;
}

/* Admin Menu Styles */
.dropdown-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem 0.25rem;
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: none;
    background: none;
    margin-bottom: 0.25rem;
}

.admin-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    margin: 0.5rem 0;
    opacity: 0.6;
}

.admin-link {
    position: relative;
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
}

.admin-link:hover {
    background: linear-gradient(90deg, rgba(0, 153, 255, 0.1), rgba(0, 153, 255, 0.05));
    border-left-color: var(--color-primary);
    color: var(--color-white) !important;
}

.admin-link i {
    color: var(--color-primary) !important;
}

.admin-link:hover i {
    color: var(--color-white) !important;
    transform: scale(1.1);
}

/* Mobile Auth Styles */
@media (max-width: 768px) {
    .nav-auth {
        margin-right: 0;
        margin-left: auto;
    }
    
    .auth-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .auth-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .auth-btn span {
        display: none;
    }
    
    .user-name {
        display: none;
    }
    
    .user-dropdown {
        right: -1rem;
        min-width: 180px;
    }
}

@media (max-width: 480px) {
    .nav-auth {
        position: fixed;
        top: 70px;
        right: 1rem;
        z-index: 100;
    }
    
    .auth-buttons {
        background: var(--color-gray-900);
        padding: 0.5rem;
        border-radius: var(--radius-lg);
        border: 1px solid var(--color-gray-600);
    }
}