/* CSS Reset via CDN already loaded */
/* Custom CSS Variables for Light and Dark Themes */
:root {
    /* Light Theme Colors */
    --light-primary: #2c3e50;
    --light-secondary: #3498db;
    --light-accent: #9b59b6;
    --light-background: #ffffff;
    --light-surface: #f8f9fa;
    --light-surface-alt: #e9ecef;
    --light-text: #212529;
    --light-text-muted: #6c757d;
    --light-border: #dee2e6;
    --light-shadow: rgba(0, 0, 0, 0.1);
    --light-gradient: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    
    /* Dark Theme Colors */
    --dark-primary: #0f172a;
    --dark-secondary: #3b82f6;
    --dark-accent: #8b5cf6;
    --dark-background: #1e293b;
    --dark-surface: #334155;
    --dark-surface-alt: #475569;
    --dark-text: #f8fafc;
    --dark-text-muted: #cbd5e1;
    --dark-border: #475569;
    --dark-shadow: rgba(0, 0, 0, 0.3);
    --dark-gradient: linear-gradient(135deg, #7c3aed 0%, #3b82f6 100%);
    
    /* Common Colors */
    --midnight: #1a1a2e;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Borders */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index layers */
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-fixed: 30;
    --z-modal-backdrop: 40;
    --z-modal: 50;
    --z-popover: 60;
    --z-tooltip: 70;
}

/* Dark theme specific variables */
body.dark-mode {
    --color-primary: var(--dark-primary);
    --color-secondary: var(--dark-secondary);
    --color-accent: var(--dark-accent);
    --color-background: var(--dark-background);
    --color-surface: var(--dark-surface);
    --color-surface-alt: var(--dark-surface-alt);
    --color-text: var(--dark-text);
    --color-text-muted: var(--dark-text-muted);
    --color-border: var(--dark-border);
    --color-shadow: var(--dark-shadow);
    --color-gradient: var(--dark-gradient);
}

/* Light theme specific variables */
body.light-mode {
    --color-primary: var(--light-primary);
    --color-secondary: var(--light-secondary);
    --color-accent: var(--light-accent);
    --color-background: var(--light-background);
    --color-surface: var(--light-surface);
    --color-surface-alt: var(--light-surface-alt);
    --color-text: var(--light-text);
    --color-text-muted: var(--light-text-muted);
    --color-border: var(--light-border);
    --color-shadow: var(--light-shadow);
    --color-gradient: var(--light-gradient);
}

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
    position: relative;
}

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

ul {
    list-style: none;
}

.container-header {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--color-gradient);
    z-index: var(--z-tooltip);
    transition: width 0.1s ease;
}

/* Header and Navigation */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-surface);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--color-shadow);
    z-index: var(--z-fixed);
    transition: all var(--transition-normal);
}

.main-header .container-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.logo-section {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-circle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: var(--font-size-xl);
}

.site-title {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

/* Desktop Navigation */
.desktop-navigation {
    display: none;
}

@media (min-width: 992px) {
    .desktop-navigation {
        display: block;
    }
    
    .desktop-menu {
        display: flex;
        gap: var(--spacing-xl);
    }
    
    .menu-item {
        position: relative;
    }
    
    .menu-link {
        padding: var(--spacing-sm) 0;
        font-weight: 500;
        position: relative;
        color: var(--color-text-muted);
        transition: color var(--transition-fast);
    }
    
    .menu-link:hover,
    .menu-link.active {
        color: var(--color-text);
    }
    
    .menu-link::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--color-gradient);
        transition: width var(--transition-normal);
    }
    
    .menu-link:hover::after,
    .menu-link.active::after {
        width: 100%;
    }
    
    .has-submenu {
        position: relative;
    }
    
    .submenu-icon {
        font-size: var(--font-size-xs);
        margin-left: var(--spacing-xs);
        transition: transform var(--transition-normal);
    }
    
    .has-submenu:hover .submenu-icon {
        transform: rotate(180deg);
    }
    
    .submenu {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 200px;
        background-color: var(--color-surface);
        box-shadow: 0 10px 30px var(--color-shadow);
        border-radius: var(--radius-md);
        padding: var(--spacing-sm) 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(10px);
        transition: all var(--transition-normal);
        z-index: var(--z-dropdown);
    }
    
    .has-submenu:hover .submenu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .submenu li {
        padding: 0;
    }
    
    .submenu a {
        display: block;
        padding: var(--spacing-sm) var(--spacing-lg);
        color: var(--color-text-muted);
        transition: all var(--transition-fast);
    }
    
    .submenu a:hover {
        color: var(--color-text);
        background-color: var(--color-surface-alt);
        padding-left: var(--spacing-xl);
    }
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Theme Toggle */
.theme-toggle {
    display: inline-block;
}

.toggle-checkbox {
    display: none;
}

.toggle-label {
    display: block;
    cursor: pointer;
}

.toggle-track {
    width: 60px;
    height: 30px;
    background: var(--color-surface-alt);
    border-radius: var(--radius-full);
    position: relative;
    transition: background var(--transition-normal);
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background: var(--color-gradient);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-normal);
}

.toggle-checkbox:checked + .toggle-label .toggle-thumb {
    transform: translateX(30px);
}

.light-icon,
.dark-icon {
    font-size: var(--font-size-sm);
    color: white;
    position: absolute;
}

.light-icon {
    left: 4px;
}

.dark-icon {
    right: 4px;
}

/* Search Icon */
.search-icon {
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-alt);
    transition: all var(--transition-normal);
}

.search-icon:hover {
    background-color: var(--color-border);
    transform: scale(1.05);
}

/* Mobile Toggle */
.mobile-toggle {
    display: block;
    cursor: pointer;
}

@media (min-width: 992px) {
    .mobile-toggle {
        display: none;
    }
}

.hamburger {
    width: 30px;
    height: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.hamburger span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-text);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.mobile-overlay.active .hamburger span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.mobile-overlay.active .hamburger span:nth-child(2) {
    opacity: 0;
}

.mobile-overlay.active .hamburger span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Mobile Overlay */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-surface);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-100%);
    transition: all var(--transition-slow);
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.mobile-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl);
}

.mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.mobile-close {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-alt);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.mobile-close:hover {
    background-color: var(--color-border);
    transform: rotate(90deg);
}

/* Mobile Navigation */
.mobile-navigation {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl) 0;
}

.mobile-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-item {
    border-bottom: 1px solid var(--color-border);
}

.mobile-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
    font-weight: 500;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.mobile-link.active,
.mobile-link:hover {
    color: var(--color-accent);
}

.mobile-link i:first-child {
    margin-right: var(--spacing-md);
    width: 20px;
    text-align: center;
}

.submenu-toggle {
    display: flex;
    align-items: center;
}

.submenu-toggle .fa-plus,
.submenu-toggle .fa-minus {
    font-size: var(--font-size-sm);
    transition: opacity var(--transition-fast);
}

.submenu-toggle .fa-minus {
    opacity: 0;
    position: absolute;
}

.mobile-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
    padding-left: var(--spacing-xl);
}

.has-submenu.active .mobile-submenu {
    max-height: 300px;
}

.has-submenu.active .submenu-toggle .fa-plus {
    opacity: 0;
}

.has-submenu.active .submenu-toggle .fa-minus {
    opacity: 1;
    position: relative;
}

.mobile-submenu li {
    padding: var(--spacing-sm) 0;
}

.mobile-submenu a {
    display: block;
    padding: var(--spacing-sm) 0;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.mobile-submenu a:hover {
    color: var(--color-text);
}

/* Mobile Theme Toggle */
.mobile-theme {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

.theme-label {
    font-weight: 500;
}

/* Search Overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-surface);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-100%);
    transition: all var(--transition-slow);
}

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

.search-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl);
}

.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.search-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.search-close {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface-alt);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-close:hover {
    background-color: var(--color-border);
    transform: rotate(90deg);
}

.search-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.search-form {
    margin-bottom: var(--spacing-2xl);
}

.search-input-group {
    display: flex;
    position: relative;
}

.search-input {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
    padding-right: 70px;
    font-size: var(--font-size-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    background-color: var(--color-surface-alt);
    color: var(--color-text);
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(155, 89, 182, 0.2);
}

.search-submit {
    position: absolute;
    right: 5px;
    top: 5px;
    bottom: 5px;
    width: 60px;
    background: var(--color-gradient);
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-submit:hover {
    transform: scale(1.05);
}

.search-suggestions {
    padding-top: var(--spacing-xl);
}

.suggestion-title {
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.suggestion-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.suggestion-list a {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-surface-alt);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.suggestion-list a:hover {
    background-color: var(--color-accent);
    color: white;
    transform: translateY(-3px);
}

/* Hero Section */
.hero-section {
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .hero-container {
        flex-direction: row;
    }
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    background: var(--color-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

.hero-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.button-primary,
.button-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.button-primary {
    background: var(--color-gradient);
    color: white;
    border: none;
}

.button-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px var(--color-shadow);
}

.button-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.button-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
}

.hero-visual {
    flex: 1;
    position: relative;
    height: 300px;
    width: 100%;
}

@media (min-width: 768px) {
    .hero-visual {
        height: 400px;
    }
}

.visual-circle,
.visual-square,
.visual-triangle {
    position: absolute;
    border-radius: var(--radius-xl);
    background: var(--color-gradient);
    opacity: 0.7;
    filter: blur(20px);
}

.visual-circle {
    width: 150px;
    height: 150px;
    top: 20px;
    right: 20px;
    border-radius: var(--radius-full);
}

.visual-square {
    width: 120px;
    height: 120px;
    bottom: 40px;
    left: 10px;
}

.visual-triangle {
    width: 0;
    height: 0;
    border-left: 80px solid transparent;
    border-right: 80px solid transparent;
    border-bottom: 140px solid;
    border-bottom-color: var(--color-accent);
    top: 60px;
    left: 50px;
    opacity: 0.5;
    background: none;
}

/* Placeholder Sections */
.section-placeholder {
    padding: 80px 0;
    border-top: 1px solid var(--color-border);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.section-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

/* Circular Progress and Back to Top */
.scroll-indicators {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    z-index: var(--z-sticky);
}

.circular-progress {
    position: relative;
    width: 60px;
    height: 60px;
    cursor: pointer;
}

.progress-bg {
    stroke: var(--color-surface-alt);
}

.progress-fill {
    stroke: var(--color-accent);
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 0.3s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.top-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    box-shadow: 0 5px 15px var(--color-shadow);
    color: var(--color-text);
    font-size: var(--font-size-xs);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.top-button:hover {
    background-color: var(--color-accent);
    color: white;
    transform: translateY(-5px);
}

/* Mouse Tracker */
.mouse-tracker {
    position: fixed;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background-color: var(--color-accent);
    opacity: 0.3;
    pointer-events: none;
    z-index: var(--z-tooltip);
    transition: transform 0.1s ease;
    mix-blend-mode: difference;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Main Content Padding for Fixed Header */
.main-content {
    padding-top: 80px;
}

/* Responsive adjustments */
@media (max-width: 991px) {
    .desktop-navigation {
        display: none;
    }
    
    .header-actions {
        gap: var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
}

@media (max-width: 576px) {
    .container-header,
    .container-section {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-text {
        font-size: var(--font-size-base);
    }
    
    .button-primary,
    .button-secondary {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .scroll-indicators {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}