/* Root Variables */
:root {
    --primary-color: #ffb347;
    --secondary-color: #60BADB;
    --dark-bg: #181a20;
    --card-bg: #2c3050;
    --text-primary: #ffffff;
    --text-secondary: #b2becd;
    --border-color: rgba(255, 255, 255, 0.1);
    --hover-bg: rgba(255, 179, 71, 0.1);
    --success-color: #4caf50;
    --error-color: #f44336;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 30px;
    position: relative;
}

.return-btn {
    position: absolute;
    left: 0;
    top: 40px;
    padding: 10px 20px;
    background: var(--card-bg);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    font-size: 14px;
}

.return-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateX(-5px);
}

.header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2em;
    color: var(--text-secondary);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
    background: var(--card-bg);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.nav-btn {
    padding: 12px 24px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.nav-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: transparent;
    color: var(--dark-bg);
    font-weight: 600;
}

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

.section.active {
    display: block;
}

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

/* Content Cards */
.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.content-card h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 2em;
}

.content-card h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
    margin-top: 25px;
    font-size: 1.5em;
}

.content-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.content-card ul {
    color: var(--text-secondary);
    margin-left: 25px;
    margin-bottom: 15px;
}

.content-card ul li {
    margin-bottom: 10px;
}

.content-card code {
    background: rgba(255, 179, 71, 0.1);
    color: var(--primary-color);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

/* Highlight Box */
.highlight-box {
    background: rgba(96, 186, 219, 0.1);
    border-left: 4px solid var(--secondary-color);
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
}

.highlight-box h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.highlight-box ul li strong {
    color: var(--primary-color);
}

/* Architecture Diagram */
.architecture-diagram {
    background: rgba(0, 0, 0, 0.3);
    padding: 30px;
    border-radius: 12px;
    margin: 20px 0;
}

.arch-layer {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.arch-box {
    padding: 20px;
    border-radius: 8px;
    min-width: 180px;
    text-align: center;
    border: 2px solid;
    transition: all 0.3s ease;
}

.arch-box:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.arch-box.gateway {
    background: rgba(255, 179, 71, 0.2);
    border-color: var(--primary-color);
}

.arch-box.service {
    background: rgba(96, 186, 219, 0.2);
    border-color: var(--secondary-color);
}

.arch-box.database {
    background: rgba(76, 175, 80, 0.2);
    border-color: var(--success-color);
}

.arch-box h4 {
    color: var(--text-primary);
    margin-bottom: 5px;
    font-size: 1.1em;
}

.arch-box p {
    color: var(--text-secondary);
    font-size: 0.9em;
    margin: 0;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-card {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.1), rgba(96, 186, 219, 0.1));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.stat-number {
    font-size: 3em;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1em;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 3em;
    margin-bottom: 15px;
    display: block;
}

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

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Service Details */
.service-details {
    display: grid;
    gap: 20px;
    margin: 30px 0;
}

.service-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.service-header {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.2), rgba(96, 186, 219, 0.2));
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.service-header h3 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.4em;
}

.service-port {
    background: rgba(0, 0, 0, 0.3);
    color: var(--secondary-color);
    padding: 5px 15px;
    border-radius: 20px;
    font-family: 'Courier New', monospace;
    font-weight: bold;
}

.service-body {
    padding: 25px;
}

.service-body p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.service-body strong {
    color: var(--primary-color);
}

.service-body ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.service-body ul li {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* Code Blocks */
.code-block {
    position: relative;
    background: #1a1d2e;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 20px 0;
    overflow: hidden;
}

.code-block pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    line-height: 1.6;
    color: #e0e0e0;
    background: transparent;
    padding: 0;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 8px 16px;
    background: rgba(255, 179, 71, 0.2);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
    z-index: 10;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    transform: scale(1.05);
}

/* Comparison Table */
.comparison-table {
    margin: 30px 0;
}

.comparison-table h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    font-size: 1.5em;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

thead {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.2), rgba(96, 186, 219, 0.2));
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--primary-color);
    font-weight: 600;
}

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

td strong {
    color: var(--text-primary);
}

tbody tr:hover {
    background: rgba(255, 179, 71, 0.05);
}

/* Learnings Grid */
.learnings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.learning-item {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.1), rgba(96, 186, 219, 0.1));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.learning-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.learning-item h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1em;
}

.learning-item p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Tech Stack */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.tech-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-bg);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2em;
    }

    .subtitle {
        font-size: 1em;
    }

    .return-btn {
        position: static;
        display: inline-block;
        margin-bottom: 20px;
    }

    .nav-tabs {
        gap: 8px;
        padding: 10px;
    }

    .nav-btn {
        padding: 10px 16px;
        font-size: 12px;
    }

    .content-card {
        padding: 20px;
    }

    .content-card h2 {
        font-size: 1.5em;
    }

    .content-card h3 {
        font-size: 1.2em;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .arch-layer {
        flex-direction: column;
        align-items: center;
    }

    .arch-box {
        width: 100%;
        max-width: 300px;
    }

    .service-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .code-block pre {
        padding: 15px;
        font-size: 0.85em;
    }

    .copy-btn {
        position: static;
        display: block;
        margin: 10px;
    }

    table {
        font-size: 0.85em;
    }

    th, td {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 20px 10px;
    }

    .header h1 {
        font-size: 1.5em;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

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

    .nav-btn {
        flex: 1 1 calc(50% - 8px);
        min-width: 120px;
    }

    .learnings-grid {
        grid-template-columns: 1fr;
    }
}