:root {
            --primary: #4895ef;
            --secondary: #560bad;
            --accent: #f72585;
            --light: #121212;
            --dark: #f8f9fa;
            --gray: #adb5bd;
            --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            --glow: 0 0 20px rgba(72, 149, 239, 0.5);
        }

        .light-theme {
            --primary: #4361ee;
            --secondary: #3a0ca3;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            --glow: 0 0 20px rgba(67, 97, 238, 0.4);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
            transition: background-color 0.5s ease, color 0.5s ease;
        }

        /* Grid Background */
        .grid-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(rgba(72, 149, 239, 0.15) 1px, transparent 1px),
                linear-gradient(90deg, rgba(72, 149, 239, 0.15) 1px, transparent 1px);
            background-size: 50px 50px;
            z-index: -1;
            opacity: 0.7;
        }

        .light-theme .grid-bg {
            background-image: 
                linear-gradient(rgba(67, 97, 238, 0.2) 1px, transparent 1px),
                linear-gradient(90deg, rgba(67, 97, 238, 0.2) 1px, transparent 1px);
        }

        /* Theme Toggle */
        .theme-toggle {
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1000;
            background: var(--primary);
            color: white;
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .theme-toggle:hover {
            transform: rotate(30deg) scale(1.1);
            box-shadow: var(--glow);
        }

        /* Navigation */
        .nav-container {
            position: fixed;
            top: 0;
            width: 100%;
            background-color: rgba(18, 18, 18, 0.9);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
            z-index: 900;
            transition: var(--transition);
        }

        .light-theme .nav-container {
            background-color: rgba(255, 255, 255, 0.95);
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo i {
            font-size: 2rem;
            color: var(--primary);
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            transition: var(--transition);
            position: relative;
            padding: 5px 0;
        }

        .nav-links a:hover {
            color: var(--primary);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            bottom: 0;
            left: 0;
            background-color: var(--primary);
            transition: var(--transition);
            border-radius: 3px;
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        /* Sections */
        section {
            min-height: 100vh;
            padding: 100px 20px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            max-width: 1200px;
            margin: 0 auto;
            opacity: 0;
            transform: translateY(50px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

        section.active {
            opacity: 1;
            transform: translateY(0);
        }

        h1, h2 {
            margin-bottom: 20px;
            color: var(--dark);
        }

        h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            font-weight: 800;
        }

        h2 {
            font-size: 2.5rem;
            position: relative;
            padding-bottom: 15px;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100px;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 5px;
        }

        .subtitle {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 30px;
        }

        p {
            margin-bottom: 15px;
            font-size: 1.1rem;
        }

        /* Hero Section */
        .hero {
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 4rem;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 20px;
            text-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .hero p {
            font-size: 1.4rem;
            margin-bottom: 40px;
            color: var(--gray);
        }

        .cta-button {
            display: inline-block;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            color: white;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.2rem;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }

        .cta-button:hover {
            transform: translateY(-5px);
            box-shadow: var(--glow);
        }

        /* Floating Elements */
        .floating-elements {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 1;
        }

        .floating-element {
            position: absolute;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            opacity: 0.2;
            animation: float 15s infinite linear;
            box-shadow: 0 0 30px rgba(72, 149, 239, 0.3);
        }

        .floating-element:nth-child(1) {
            width: 200px;
            height: 200px;
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }

        .floating-element:nth-child(2) {
            width: 150px;
            height: 150px;
            top: 60%;
            left: 80%;
            animation-delay: -5s;
        }

        .floating-element:nth-child(3) {
            width: 100px;
            height: 100px;
            top: 80%;
            left: 20%;
            animation-delay: -10s;
        }

        @keyframes float {
            0% {
                transform: translate(0, 0) rotate(0deg);
            }
            33% {
                transform: translate(30px, -50px) rotate(120deg);
            }
            66% {
                transform: translate(-20px, 20px) rotate(240deg);
            }
            100% {
                transform: translate(0, 0) rotate(360deg);
            }
        }

        /* Cards */
        .card-container {
            display: flex;
            flex-wrap: wrap;
            gap: 25px;
            margin-top: 40px;
        }

        .card {
            flex: 1;
            min-width: 300px;
            background: rgba(30, 30, 30, 0.8);
            padding: 30px;
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(72, 149, 239, 0.3);
        }

        .light-theme .card {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--glow);
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(to bottom, var(--primary), var(--accent));
        }

        .card h3 {
            margin-bottom: 15px;
            color: var(--primary);
            font-size: 1.5rem;
        }

        .card ul {
            padding-left: 20px;
        }

        .card li {
            margin-bottom: 10px;
            position: relative;
        }

        .card li::before {
            content: '•';
            color: var(--accent);
            font-weight: bold;
            display: inline-block;
            width: 1em;
            margin-left: -1em;
        }

        /* Timeline */
        .timeline {
            margin-top: 40px;
            position: relative;
        }

        .timeline::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 100%;
            background: linear-gradient(to bottom, var(--primary), var(--accent));
            border-radius: 10px;
            box-shadow: 0 0 15px rgba(72, 149, 239, 0.5);
            z-index: 1;
        }

        .timeline-item {
            display: flex;
            margin-bottom: 50px;
            position: relative;
        }

        .timeline-item:nth-child(odd) {
            flex-direction: row-reverse;
        }

        .timeline-content {
            flex: 1;
            background: rgba(30, 30, 30, 0.8);
            padding: 25px;
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid rgba(72, 149, 239, 0.3);
            position: relative;
            z-index: 2;
        }

        .light-theme .timeline-content {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .timeline-content:hover {
            transform: scale(1.03);
            box-shadow: var(--glow);
        }

        .timeline-time {
            font-weight: bold;
            color: var(--primary);
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        .timeline-phase {
            font-weight: bold;
            color: var(--dark);
            margin-bottom: 10px;
            font-size: 1.3rem;
        }

        .timeline-marker {
            position: absolute;
            top: 25px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background-color: var(--primary);
            border: 4px solid var(--light);
            box-shadow: 0 0 0 4px var(--primary), 0 0 15px rgba(72, 149, 239, 0.7);
            z-index: 3;
        }

        .light-theme .timeline-marker {
            border: 4px solid var(--light);
            box-shadow: 0 0 0 4px var(--primary), 0 0 15px rgba(67, 97, 238, 0.5);
        }

        /* Ratio Visualization */
        .ratio-container {
            display: flex;
            align-items: center;
            margin: 40px 0;
            background: rgba(30, 30, 30, 0.8);
            padding: 30px;
            border-radius: 15px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(72, 149, 239, 0.3);
        }

        .light-theme .ratio-container {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .ratio-visual {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .ratio-bar {
            width: 300px;
            height: 40px;
            background: linear-gradient(90deg, var(--primary) 25%, var(--accent) 25%);
            border-radius: 20px;
            position: relative;
            box-shadow: var(--shadow);
            border: 2px solid rgba(72, 149, 239, 0.3);
        }

        .light-theme .ratio-bar {
            border: 2px solid rgba(67, 97, 238, 0.3);
        }

        .ratio-bar::before {
            content: '1:2 Ratio';
            position: absolute;
            top: -40px;
            left: 50%;
            transform: translateX(-50%);
            font-weight: bold;
            color: var(--primary);
            font-size: 1.2rem;
        }

        .ratio-info {
            flex: 1;
            padding-left: 30px;
        }

        /* Gap Visualization */
        .gap-visual {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 40px 0;
            position: relative;
        }

        .day-card {
            flex: 1;
            text-align: center;
            background: rgba(30, 30, 30, 0.8);
            padding: 25px;
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            z-index: 1;
            border: 1px solid rgba(72, 149, 239, 0.3);
        }

        .light-theme .day-card {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .day-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--glow);
        }

        .day-card h3 {
            margin-bottom: 10px;
            color: var(--primary);
            font-size: 1.3rem;
        }

        .connector {
            position: absolute;
            top: 50%;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            z-index: 0;
            box-shadow: 0 0 10px rgba(72, 149, 239, 0.3);
        }

        /* Checklist */
        .checklist {
            margin-top: 40px;
        }

        .checklist-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
            background: rgba(30, 30, 30, 0.8);
            padding: 25px;
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid rgba(72, 149, 239, 0.3);
        }

        .light-theme .checklist-item {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .checklist-item:hover {
            transform: translateX(10px);
            box-shadow: var(--glow);
        }

        .checkmark {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            margin-right: 20px;
            flex-shrink: 0;
            font-weight: bold;
            font-size: 1.2rem;
            box-shadow: 0 5px 15px rgba(72, 149, 239, 0.3);
        }

        .checklist-item h3 {
            margin-bottom: 10px;
            color: var(--primary);
        }

        /* Final Takeaway */
        .takeaway {
            margin-top: 50px;
            text-align: center;
            font-style: italic;
            font-size: 1.4rem;
            color: var(--primary);
            padding: 30px;
            background: rgba(30, 30, 30, 0.8);
            border-radius: 15px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(72, 149, 239, 0.3);
            position: relative;
            overflow: hidden;
        }

        .light-theme .takeaway {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(67, 97, 238, 0.2);
        }

        .takeaway::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }

        /* Footer */
        footer {
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            color: white;
            padding: 60px 20px 30px;
            position: relative;
            overflow: hidden;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

        .footer-section {
            flex: 1;
            min-width: 250px;
        }

        .footer-section h3 {
            font-size: 1.5rem;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-section h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: white;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }

        /* Responsive */
        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }
            
            h2 {
                font-size: 2rem;
            }
            
            .hero h1 {
                font-size: 3rem;
            }
            
            .timeline::before {
                left: 30px;
            }
            
            .timeline-item {
                flex-direction: row !important;
                padding-left: 60px;
            }
            
            .timeline-marker {
                left: 30px;
            }
            
            .ratio-container {
                flex-direction: column;
            }
            
            .ratio-info {
                padding-left: 0;
                margin-top: 20px;
            }
            
            .gap-visual {
                flex-direction: column;
                gap: 20px;
            }
            
            .connector {
                display: none;
            }
            
            .nav-links {
                display: none;
            }
            
            .theme-toggle {
                top: 15px;
                right: 15px;
                width: 45px;
                height: 45px;
            }
        }