:root {
    --primary-color: #ffb347;
    --secondary-color: #60BADB;
    --dark-bg: #181a20;
    --card-bg: #2c3050;
    --darker-bg: #1a1d24;
    --text-primary: #f5f6fa;
    --text-secondary: #b2becd;
    --border-color: rgba(255, 179, 71, 0.3);
    --hover-bg: rgba(96, 186, 219, 0.1);
}

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

body {
    font-family: 'Montserrat', 'Roboto', Arial, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #0f1115 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: linear-gradient(#1a1d24 0%, var(--card-bg) 100%);
    border-radius: 15px;
    border: 2px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), #ffa31a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h1 .emoji { 
    font-size: 3rem; 
    -webkit-background-clip: initial; 
    -webkit-text-fill-color: initial; 
    background-clip: initial; 
    color: inherit; 
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.tech-badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1rem;
}

.tech-badge {
    display: inline-block;
    background: rgba(255, 179, 71, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.tech-badge:hover {
    background: var(--hover-bg);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 15px;
    border: 2px solid var(--border-color);
}

.nav-btn {
    padding: 0.8rem 1.2rem;
    background: rgba(255, 179, 71, 0.05);
    border: 2px solid transparent;
    border-radius: 10px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.95rem;
    font-family: 'Montserrat', sans-serif;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

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

.nav-btn.active {
    background: linear-gradient(135deg, var(--primary-color), #ffa31a);
    border-color: var(--primary-color);
    color: var(--dark-bg);
    font-weight: 600;
    box-shadow: 0 5px 15px rgba(255, 179, 71, 0.3);
}

.nav-btn.return-btn {
    background: rgba(96, 186, 219, 0.1);
    border-color: var(--secondary-color);
}

.nav-btn.return-btn:hover {
    background: rgba(96, 186, 219, 0.2);
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Content Cards */
.content-card {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.05) 0%, var(--card-bg) 100%);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 2rem 0 1rem 0;
    font-weight: 600;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--darker-bg);
    border: 2px solid rgba(255, 179, 71, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(255, 179, 71, 0.2);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* Architecture Diagram */
.architecture-diagram {
    background: var(--darker-bg);
    padding: 2rem;
    border-radius: 12px;
    margin: 1.5rem 0;
}

.layer {
    background: var(--card-bg);
    padding: 1.5rem;
    margin: 1rem 0;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.layer:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(255, 179, 71, 0.2);
}

.layer-title {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.layer-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #f0f0f0;
    font-size: 1rem;
    font-weight: 600;
}

/* Code Blocks */
.code-container {
    position: relative;
    margin: 1.5rem 0;
}

.code-block {
    background: #0d1117;
    color: #c9d1d9;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid #30363d;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.code-block pre {
    margin: 0;
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 179, 71, 0.1);
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    z-index: 10;
}

.copy-btn:hover {
    background: rgba(255, 179, 71, 0.2);
    transform: scale(1.05);
}

/* Comparison Table */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 1.5rem 0;
    border-radius: 8px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--darker-bg);
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 179, 71, 0.1);
}

.comparison-table th {
    background: rgba(255, 179, 71, 0.1);
    color: var(--primary-color);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.comparison-table td {
    color: var(--text-secondary);
}

.comparison-table tr:hover {
    background: rgba(255, 179, 71, 0.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header {
        padding: 1.5rem 1rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .nav-tabs {
        padding: 0.8rem;
        gap: 0.4rem;
    }

    .nav-btn {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
    }

    .content-card {
        padding: 1.5rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .code-block {
        font-size: 0.8rem;
        padding: 1rem;
    }

    .copy-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }

    .comparison-table {
        font-size: 0.85rem;
        min-width: 600px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.8rem 0.5rem;
    }

    .layer {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    .nav-btn {
        padding: 0.5rem 0.6rem;
        font-size: 0.8rem;
    }

    .tech-badge {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
}