/* ===================================
   CSS Variables & Premium Enterprise Theme
   =================================== */
:root {
    /* Premium Brand Colors - Sophisticated Palette */
    --primary: #1a1a1a;
    --primary-dark: #0a0a0a;
    --primary-light: #2d2d2d;
    --secondary: #d4af37;
    --secondary-dark: #b8961f;
    --accent: #c0c0c0;
    --success: #2d5016;
    --warning: #8b6914;
    --danger: #7a1a1a;
    
    /* Light Theme - Premium Gray Scale */
    --bg-primary: #fafaf9;
    --bg-secondary: #f5f5f4;
    --bg-tertiary: #e7e5e4;
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-tertiary: #78716c;
    --border-color: #d6d3d1;
    --grid-color: rgba(120, 113, 108, 0.08);
    --card-bg: #ffffff;
    
    /* Shadows - Subtle & Professional */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.18);
    --shadow-2xl: 0 30px 60px -12px rgba(0, 0, 0, 0.25);
    
    /* Effects */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Gradient Accents */
    --gradient-gold: linear-gradient(135deg, #d4af37 0%, #f4d683 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    --gradient-silver: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%);
}

/* Dark Theme - Premium Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #fafaf9;
    --text-secondary: #d4d4d4;
    --text-tertiary: #a3a3a3;
    --border-color: #2d2d2d;
    --grid-color: rgba(212, 175, 55, 0.06);
    --card-bg: #0f0f0f;
    
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.9);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.8);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.85);
    --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.9);
    --shadow-2xl: 0 30px 60px -12px rgba(0, 0, 0, 0.95);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.65;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background 0.5s ease, color 0.3s ease;
    overflow-x: hidden;
    position: relative;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Enhanced Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    line-height: 1.65;
}

/* ===================================
   Grid Background with Animation
   =================================== */
.grid-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        linear-gradient(var(--grid-color) 1.5px, transparent 1.5px),
        linear-gradient(90deg, var(--grid-color) 1.5px, transparent 1.5px);
    background-size: 60px 60px;
    background-position: -1px -1px;
    animation: gridPulse 8s ease-in-out infinite;
    transition: background-size 0.3s ease, opacity 0.3s ease;
}

@keyframes gridPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

/* ===================================
   Navbar - Professional Design
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 250, 249, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.125rem 0;
    transition: var(--transition);
}

[data-theme="dark"] .navbar {
    background: rgba(10, 10, 10, 0.85);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo-icon {
    width: 36px;
    height: 36px;
    transition: transform 0.3s ease;
}

.nav-brand:hover .logo-icon {
    transform: rotate(180deg);
}

.brand-name {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-gold);
    transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--secondary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Sign In Button */
.btn-signin {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: 1px solid var(--primary);
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: none;
    letter-spacing: -0.01em;
}

.btn-signin:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-signin svg {
    transition: var(--transition);
}

.btn-signin:hover svg {
    transform: scale(1.1);
}

/* User Profile Button (when logged in) */
.user-profile-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.user-profile-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.user-progress {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.2;
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sun-icon,
.moon-icon {
    position: absolute;
    transition: all 0.3s ease;
}

.sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.moon-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-primary);
    z-index: 999;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding-top: 80px;
}

.mobile-nav-overlay.active {
    display: flex;
    opacity: 1;
}

.mobile-nav-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 2rem;
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    text-align: center;
}

.mobile-nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
}

.mobile-nav-link:hover::after,
.mobile-nav-link.active::after {
    width: 100%;
}

.mobile-nav-link:hover {
    color: var(--primary);
}

/* ===================================
   Authentication Modal
   =================================== */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
    padding: 1rem;
}

.auth-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    max-width: 450px;
    width: 100%;
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    animation: slideInUp 0.4s ease-out;
}

.auth-header {
    background: var(--primary);
    padding: 2rem;
    text-align: center;
    color: white;
    position: relative;
}

.auth-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.auth-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.auth-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.auth-logo {
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.auth-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    font-size: 0.95rem;
    opacity: 0.9;
}

.auth-body {
    padding: 2rem;
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: 12px;
}

.auth-tab {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--card-bg);
    color: var(--secondary);
    box-shadow: var(--shadow-sm);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.auth-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.auth-form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.auth-error {
    padding: 0.875rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #ef4444;
    font-size: 0.875rem;
    font-weight: 500;
}

.auth-input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.auth-input:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.auth-submit {
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
    letter-spacing: -0.01em;
}

.auth-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.auth-social {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.auth-social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.auth-social-btn:hover {
    border-color: var(--secondary);
    transform: translateY(-1px);
}

/* Dashboard Modal */
.dashboard-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
    padding: 1rem;
}

.dashboard-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    animation: slideInUp 0.4s ease-out;
}

.dashboard-header {
    background: var(--primary);
    padding: 2rem;
    color: white;
    position: relative;
}

.dashboard-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 1.25rem;
}

.dashboard-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.dashboard-user {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.dashboard-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: 3px solid white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
}

.dashboard-user-info h2 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.dashboard-user-email {
    opacity: 0.9;
    font-size: 0.95rem;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.dashboard-stat {
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
}

.dashboard-stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.dashboard-stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

.dashboard-body {
    padding: 2rem;
}

.dashboard-section {
    margin-bottom: 2rem;
}

.dashboard-section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.progress-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.progress-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    transition: var(--transition);
}

.progress-item:hover {
    border-color: var(--secondary);
    transform: translateX(4px);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.progress-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.progress-badge.completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.progress-badge.in-progress {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-gold);
    border-radius: 3px;
    transition: width 0.6s ease;
}

.progress-details {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.dashboard-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.dashboard-btn {
    flex: 1;
    padding: 0.875rem;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.dashboard-btn-primary {
    background: var(--primary);
    color: white;
    font-weight: 500;
}

.dashboard-btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.dashboard-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   Section Divider
   =================================== */
.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
    position: relative;
}

.divider-line {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    position: relative;
}

.divider-icon {
    margin: 0 2rem;
    width: 64px;
    height: 64px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
    position: relative;
    box-shadow: var(--shadow-md);
    animation: rotateDivider 10s linear infinite;
}

.divider-icon::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-gold);
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.divider-icon:hover::before {
    opacity: 1;
}

.divider-icon:hover {
    animation-play-state: paused;
    transform: scale(1.1);
    border-color: transparent;
}

@keyframes rotateDivider {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===================================
   Hero Section - Stunning Design
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

/* Floating Particles */
.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--secondary);
    border-radius: 50%;
    opacity: 0.25;
    animation: float 15s infinite ease-in-out;
}

.particle:nth-child(1) {
    left: 10%;
    top: 20%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    left: 80%;
    top: 80%;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    left: 50%;
    top: 50%;
    animation-delay: 4s;
}

.particle:nth-child(4) {
    left: 30%;
    top: 70%;
    animation-delay: 1s;
}

.particle:nth-child(5) {
    left: 70%;
    top: 30%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.3;
    }
    25% {
        transform: translate(30px, -30px) scale(1.2);
        opacity: 0.5;
    }
    50% {
        transform: translate(-20px, 40px) scale(0.8);
        opacity: 0.3;
    }
    75% {
        transform: translate(40px, 20px) scale(1.1);
        opacity: 0.4;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 1.25rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    margin-bottom: 2rem;
    animation: slideInDown 0.8s ease-out;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--secondary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.15); }
}

.badge-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    animation: slideInUp 0.8s ease-out;
    letter-spacing: -0.03em;
}

.gradient-text {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
    font-weight: 700;
}

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

.typing-effect {
    position: relative;
    display: inline-block;
}

.typing-effect::after {
    content: '|';
    position: absolute;
    right: -10px;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    animation: slideInUp 0.8s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    animation: slideInUp 0.8s ease-out 0.4s both;
}

/* Buttons */
.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
    animation: slideInUp 0.8s ease-out 0.6s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.125rem 2.25rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: -0.01em;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
    animation: slideInUp 0.8s ease-out 0.8s both;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-gold);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--secondary);
}

.stat-card:hover::before {
    opacity: 0.06;
}

.stat-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    color: var(--secondary);
    transition: var(--transition);
}

.stat-card:hover .stat-icon {
    transform: scale(1.15);
    color: var(--secondary-dark);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===================================
   Labs Section
   =================================== */
.labs-section {
    padding: 6rem 0;
    position: relative;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.lab-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.lab-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.lab-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary);
}

.lab-card:hover::before {
    transform: scaleX(1);
}

.lab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.lab-rank {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    letter-spacing: -0.02em;
}

.difficulty-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-easy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.difficulty-medium {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.difficulty-hard {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.lab-title {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.lab-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: auto;
    min-height: 60px;
}

.lab-footer {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.lab-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    letter-spacing: -0.01em;
}

.btn-start {
    background: var(--primary);
    color: white;
    border: 1px solid var(--primary);
    box-shadow: none;
}

.btn-start:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-start svg {
    fill: white;
}

.btn-vulnerable {
    background: rgba(122, 26, 26, 0.08);
    color: var(--danger);
    border: 1px solid rgba(122, 26, 26, 0.2);
}

.btn-vulnerable:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
    transform: translateY(-2px);
    box-shadow: none;
}

.btn-secure {
    background: rgba(45, 80, 22, 0.08);
    color: var(--success);
    border: 1px solid rgba(45, 80, 22, 0.2);
}

.btn-secure:hover {
    background: var(--success);
    color: white;
    border-color: var(--success);
    transform: translateY(-2px);
    box-shadow: none;
}

/* ===================================
   About Section
   =================================== */
.about-section {
    padding: 6rem 0;
    background: var(--bg-primary);
}

.about-heading {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: start;
    margin-top: 3rem;
}

.about-content .section-tag {
    display: inline-block;
    margin-bottom: 1rem;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 1.5rem;
}

.about-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    gap: 1rem;
    align-items: start;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.feature-icon {
    min-width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-icon svg {
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background: var(--bg-tertiary);
    border-color: var(--secondary);
}

.feature-item:hover .feature-icon svg {
    transform: scale(1.1);
}

.feature-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.feature-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stats-showcase {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.showcase-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
}

.showcase-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.showcase-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    color: var(--secondary);
}

.showcase-icon svg {
    width: 32px;
    height: 32px;
}

.showcase-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
    letter-spacing: -0.02em;
}

.showcase-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.about-visual {
    position: relative;
}

.visual-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-xl);
}

.code-preview {
    background: var(--bg-tertiary);
    border-radius: 12px;
    overflow: hidden;
    animation: floatCode 6s ease-in-out infinite;
}

@keyframes floatCode {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.code-header {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-tertiary);
}

.code-dot:nth-child(1) { background: #ef4444; }
.code-dot:nth-child(2) { background: #f59e0b; }
.code-dot:nth-child(3) { background: #10b981; }

.code-title {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.code-body {
    padding: 1.5rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-comment { color: #6b7280; }
.code-keyword { color: var(--primary); }
.code-string { color: var(--success); }

/* ===================================
   Contact Section
   =================================== */
.contact-section {
    padding: 6rem 0;
    background: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-heading {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-method {
    display: flex;
    gap: 1rem;
    align-items: start;
    padding: 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.method-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    border-radius: 8px;
    color: white;
}

.method-content h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.method-content a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.method-content a:hover {
    color: var(--secondary);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    margin-top: 1rem;
    justify-content: center;
}

.submit-btn:hover {
    transform: translateY(-2px);
}

/* ===================================
   Warning Section
   =================================== */
.warning-section {
    padding: 4rem 0;
}

.warning-card {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: 16px;
    animation: pulse-warning 3s ease-in-out infinite;
}

@keyframes pulse-warning {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.warning-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.warning-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--warning);
}

.warning-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===================================
   Footer - Professional & Comprehensive
   =================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    position: relative;
    overflow: hidden;
}

.footer-grid-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, var(--grid-color) 1.5px, transparent 1.5px),
        linear-gradient(to bottom, var(--grid-color) 1.5px, transparent 1.5px);
    background-size: 60px 60px;
    background-position: -1px -1px;
    animation: gridPulse 8s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

.footer > .container {
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-logo svg {
    transition: transform 0.3s ease;
}

.footer-logo:hover svg {
    transform: rotate(180deg);
}

.footer-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--secondary);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.footer-warning {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 12px;
    margin-bottom: 1rem;
}

.footer-warning svg {
    color: var(--warning);
    flex-shrink: 0;
}

.footer-warning p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.footer-copyright {
    text-align: center;
}

.footer-copyright p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.heart {
    color: var(--danger);
    display: inline-block;
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10%, 30% { transform: scale(1.2); }
    20%, 40% { transform: scale(1); }
}

/* ===================================
   Animations
   =================================== */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-brand-section {
        grid-column: 1 / -1;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .labs-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-divider {
        padding: 2rem 0;
    }
    
    .divider-icon {
        width: 48px;
        height: 48px;
        margin: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
}