@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #141a35;
    --bg-tertiary: #1e2642;
    --accent-primary: #00d4ff;
    --accent-secondary: #7b2ff7;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #7b2ff7 100%);
    --text-primary: #e4e8f0;
    --text-secondary: #a8b2d1;
    --text-muted: #6b7a99;
    --success: #00ff88;
    --warning: #ffb800;
    --danger: #ff3366;
    --border-color: rgba(0, 212, 255, 0.2);
    --glass-bg: rgba(30, 38, 66, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at top, rgba(123, 47, 247, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(0, 212, 255, 0.15) 0%, transparent 50%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-primary);
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(0, 212, 255, 0.03) 2px, rgba(0, 212, 255, 0.03) 4px),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(123, 47, 247, 0.03) 2px, rgba(123, 47, 247, 0.03) 4px);
    pointer-events: none;
    z-index: 1;
}

header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 2.5rem 2rem;
    text-align: center;
    position: relative;
    z-index: 10;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
}

header h1 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
}

header p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    font-weight: 400;
    letter-spacing: 0.01em;
}

.main-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.nav-btn {
    padding: 0.75rem 1.75rem;
    border: 1px solid var(--border-color);
    background: rgba(30, 38, 66, 0.5);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-gradient);
    transition: left 0.3s ease;
    z-index: -1;
}

.nav-btn:hover::before {
    left: 0;
}

.nav-btn:hover {
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3);
}

.nav-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.4);
}

main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 2;
}

.content-section {
    display: none;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.content-section.active {
    display: block;
}

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

h2 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    letter-spacing: -0.02em;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100px;
    height: 2px;
    background: var(--accent-gradient);
}

h3 {
    color: var(--accent-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.db-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2.5rem;
}

.db-card {
    background: rgba(20, 26, 53, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 2.5rem;
    border-radius: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.db-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

.db-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 24px 64px rgba(0, 212, 255, 0.3);
    border-color: var(--accent-primary);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.5));
}

.db-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
}

.db-card p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.card-examples {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-style: italic;
    font-family: 'JetBrains Mono', monospace;
}

.learn-more {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.learn-more:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.4);
}

.info-box {
    background: rgba(0, 212, 255, 0.05);
    border-left: 4px solid var(--accent-primary);
    padding: 1.75rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
}

.info-box p {
    line-height: 1.8;
    color: var(--text-secondary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2.5rem 0;
}

.feature {
    background: rgba(20, 26, 53, 0.6);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature:hover {
    border-color: var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.15);
}

.feature h4 {
    color: var(--accent-primary);
    margin-bottom: 1.25rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.feature ul {
    list-style: none;
    padding: 0;
}

.feature li {
    padding: 0.6rem 0;
    padding-left: 1.75rem;
    position: relative;
    line-height: 1.7;
    color: var(--text-secondary);
}

.feature li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
    font-size: 1.2rem;
}

.example-box {
    background: rgba(20, 26, 53, 0.5);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 12px;
    margin: 2rem 0;
}

.schema-visual {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin: 2rem 0;
    justify-content: center;
}

.table-box {
    background: rgba(30, 38, 66, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-width: 220px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.table-box:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.2);
}

.table-header {
    background: var(--accent-gradient);
    color: white;
    padding: 1rem;
    font-weight: 600;
    text-align: center;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.table-field {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--glass-border);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.table-field:last-child {
    border-bottom: none;
}

.code-example {
    margin-top: 1.5rem;
}

.code-example pre {
    background: #0d1117;
    color: #c9d1d9;
    padding: 2rem;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.code-example code {
    color: #c9d1d9;
}

.use-cases {
    margin-top: 2.5rem;
}

.use-case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
}

.tag {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
    padding: 0.6rem 1.25rem;
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
}

.tag:hover {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

.kv-visual {
    background: rgba(30, 38, 66, 0.6);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.kv-pair {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1rem;
    margin: 0.75rem 0;
    background: rgba(20, 26, 53, 0.8);
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.kv-pair:hover {
    border-color: var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.1);
}

.kv-key {
    color: var(--accent-primary);
    font-weight: 600;
    min-width: 180px;
}

.kv-arrow {
    color: var(--accent-secondary);
    font-weight: bold;
    font-size: 1.3rem;
}

.kv-value {
    color: var(--text-secondary);
    flex: 1;
}

.graph-visual {
    background: rgba(30, 38, 66, 0.6);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    margin: 1.5rem 0;
}

.designer-controls {
    background: rgba(20, 26, 53, 0.6);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    align-items: center;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-group label {
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.02em;
}

.control-group select {
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: rgba(30, 38, 66, 0.8);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.control-group select:hover {
    border-color: var(--accent-primary);
}

.btn-primary, .btn-secondary, .btn-success {
    padding: 0.85rem 1.75rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
    background: rgba(107, 122, 153, 0.3);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(107, 122, 153, 0.5);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, #00ff88 0%, #00cc6a 100%);
    color: var(--bg-primary);
    box-shadow: 0 4px 16px rgba(0, 255, 136, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 255, 136, 0.4);
}

.designer-workspace {
    background: rgba(10, 14, 39, 0.5);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    min-height: 450px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.designer-canvas {
    position: relative;
    min-height: 400px;
}

.placeholder-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.15rem;
    padding: 4rem;
    letter-spacing: 0.02em;
}

.entity-box {
    position: absolute;
    background: rgba(30, 38, 66, 0.95);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-width: 220px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    cursor: move;
    transition: box-shadow 0.3s ease;
}

.entity-box:hover {
    box-shadow: 0 12px 48px rgba(0, 212, 255, 0.3);
}

.entity-header {
    background: var(--accent-gradient);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 11px 11px 0 0;
}

.entity-name {
    font-weight: 600;
    flex: 1;
    border: none;
    background: transparent;
    color: white;
    font-size: 1rem;
}

.entity-name:focus {
    outline: none;
    border-bottom: 2px solid white;
}

.delete-entity {
    background: rgba(255, 51, 102, 0.3);
    border: 1px solid rgba(255, 51, 102, 0.5);
    color: white;
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.delete-entity:hover {
    background: var(--danger);
    border-color: var(--danger);
}

.entity-fields {
    padding: 0.75rem;
}

.field-item {
    display: flex;
    gap: 0.75rem;
    padding: 0.5rem;
    align-items: center;
}

.field-item input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: rgba(10, 14, 39, 0.6);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.3s ease;
}

.field-item input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
}

.remove-field {
    background: rgba(255, 51, 102, 0.2);
    border: 1px solid rgba(255, 51, 102, 0.3);
    color: var(--danger);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.remove-field:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

.add-field {
    width: 100%;
    padding: 0.75rem;
    background: rgba(0, 212, 255, 0.05);
    border: 1px dashed var(--border-color);
    color: var(--accent-primary);
    cursor: pointer;
    border-radius: 6px;
    margin-top: 0.75rem;
    transition: all 0.3s ease;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.add-field:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent-primary);
}

.schema-output {
    background: #0d1117;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 2rem;
    overflow-x: auto;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.schema-output h3 {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
}

.schema-output pre {
    margin: 0;
    color: #c9d1d9;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.7;
}

.comparison-table-wrapper {
    overflow-x: auto;
    margin: 2.5rem 0;
    border-radius: 12px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(30, 38, 66, 0.6);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.comparison-table thead {
    background: var(--accent-gradient);
    color: white;
}

.comparison-table th,
.comparison-table td {
    padding: 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.comparison-table th {
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.comparison-table tbody tr {
    transition: all 0.3s ease;
}

.comparison-table tbody tr:hover {
    background: rgba(0, 212, 255, 0.05);
}

.rating-high {
    background: rgba(0, 255, 136, 0.15);
    color: var(--success);
    font-weight: 600;
    border-radius: 6px;
    padding: 0.5rem;
}

.rating-medium {
    background: rgba(255, 184, 0, 0.15);
    color: var(--warning);
    font-weight: 600;
    border-radius: 6px;
    padding: 0.5rem;
}

.rating-low {
    background: rgba(255, 51, 102, 0.15);
    color: var(--danger);
    font-weight: 600;
    border-radius: 6px;
    padding: 0.5rem;
}

.decision-helper {
    background: rgba(20, 26, 53, 0.6);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: 12px;
    margin-top: 2.5rem;
}

.decision-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin: 2rem 0;
}

.decision-btn {
    padding: 1.25rem;
    background: rgba(30, 38, 66, 0.6);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.02em;
}

.decision-btn:hover {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.3);
}

.recommendation {
    margin-top: 2rem;
    padding: 2rem;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 12px;
    border-left: 4px solid var(--accent-primary);
    display: none;
}

.recommendation.show {
    display: block;
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.recommendation h4 {
    color: var(--accent-primary);
    margin-bottom: 1.25rem;
    font-size: 1.35rem;
}

.recommendation p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

footer {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
    color: var(--text-muted);
    position: relative;
    z-index: 10;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--accent-gradient);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .main-nav {
        gap: 0.5rem;
    }

    .nav-btn {
        padding: 0.6rem 1.25rem;
        font-size: 0.875rem;
    }

    .content-section {
        padding: 1.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

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

    .designer-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}