:root {
    /* Brand Colors */
    --color-primary: #f7a11b;
    --color-primary-hover: #df8f15;
    --color-dark-bg: #222;
    --color-darker-bg: #1b1b1b;
    --color-text-light: #fff;
    --color-text-dark: #333;
    --color-text-medium: #666;
    --color-text-muted: #686868;
    --color-text-subtle: #555;
    --color-border: #ddd;
    --color-border-light: #ececec;
    --color-border-lighter: #d8d8d8;
    --color-bg-light: #fdfdfd;
    --color-bg-lighter: #f5f5f5;
    --color-bg-input: #fafafa;
    --color-error: #d62728;
    --color-info: #0bad81;
    --color-panel-bg: rgba(0, 0, 0, 0.22);
}

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

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--color-text-light);
    background: linear-gradient(135deg, var(--color-darker-bg), #333);
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header-ribbon {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: var(--color-dark-bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 40px;
}

.logo a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: bold;
    font-size: 20px;
    transition: color 0.3s;
}

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

.nav {
    display: flex;
    align-items: center;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.nav a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 15px;
    font-weight: bold;
    transition: color 0.3s;
}

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

main {
    flex: 1;
    padding: 20px;
    max-width: 1400px;
    margin: 20px auto;
    width: 100%;
}

.graph-container {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    padding: 20px;
}

.graph-title {
    color: var(--color-text-dark);
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
    font-weight: bold;
}

.graph-stage {
    position: relative;
    width: 100%;
    height: 700px;
    border-radius: 8px;
    overflow: hidden;
}

#ontology-network-graph {
    width: 100%;
    height: 100%;
    background-color: #ffffff;
    border: 1px solid lightgray;
    position: relative;
    border-radius: 8px;
}

.loading-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(200, 200, 200, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 20;
    border-radius: 8px;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.loading-bar-content {
    position: relative;
    width: 400px;
    height: 30px;
    background: linear-gradient(to bottom, rgba(252, 252, 252, 1) 0%, rgba(237, 237, 237, 1) 100%);
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.loading-bar-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, #0bad81, #17becf);
    border-radius: 18px;
    transition: width 0.1s linear;
}

.loading-bar-text {
    position: absolute;
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    font-size: 13px;
    font-weight: 600;
    color: #000;
    z-index: 1;
    min-width: 35px;
    text-align: right;
}

.side-panel-overlay {
    position: absolute;
    inset: 0;
    background: var(--color-panel-bg);
    z-index: 25;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
}

.side-panel-overlay.open {
    opacity: 1;
    visibility: visible;
}

.side-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: 380px;
    height: 100%;
    background: var(--color-bg-light);
    color: #1f1f1f;
    border-left: 1px solid var(--color-border-lighter);
    transform: translateX(100%);
    transition: transform 0.24s ease;
    z-index: 30;
    display: flex;
    flex-direction: column;
}

.side-panel.open {
    transform: translateX(0);
    box-shadow: -10px 0 30px var(--color-panel-bg);
}

.side-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 16px 18px 10px;
    border-bottom: 1px solid var(--color-border-light);
}

.side-panel-title-wrap {
    min-width: 0;
}

.side-panel-title {
    margin: 0;
    font-size: 20px;
    line-height: 1.2;
    color: #222;
    word-break: break-word;
}

.side-panel-prefix {
    margin: 4px 0 0;
    font-size: 12px;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.side-panel-close {
    border: none;
    background: transparent;
    font-size: 28px;
    line-height: 1;
    color: var(--color-text-medium);
    cursor: pointer;
    padding: 0 0 0 10px;
}

.side-panel-content {
    overflow-y: auto;
    padding: 14px 18px 20px;
}

.domain-badge {
    display: inline-block;
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 12px;
    color: #fff;
    font-weight: 600;
    margin-bottom: 12px;
}

.side-panel-description {
    color: var(--color-text-dark);
    font-size: 14px;
    margin-bottom: 16px;
}

.side-panel-section {
    margin-bottom: 16px;
}

.side-panel-section h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-subtle);
    margin: 0 0 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.stats-card {
    background: var(--color-bg-lighter);
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 10px;
}

.stats-label {
    font-size: 11px;
    color: #6b6b6b;
    margin: 0 0 3px;
}

.stats-value {
    font-size: 17px;
    font-weight: 700;
    color: #242424;
    margin: 0;
}

.linked-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.linked-tag {
    border: 1px solid #d3d3d3;
    background: var(--color-bg-input);
    color: var(--color-text-dark);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 12px;
    cursor: pointer;
    text-transform: uppercase;
}

.linked-tag:hover {
    background: #f1f1f1;
}

.panel-action {
    display: inline-block;
    text-decoration: none;
    background: var(--color-primary);
    color: var(--color-text-light);
    font-weight: 600;
    padding: 10px 14px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.panel-action:hover {
    color: var(--color-text-light);
    background: var(--color-primary-hover);
}

.legend-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 15px;
    background: var(--color-bg-lighter);
    border-top: 1px solid var(--color-border);
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--color-text-dark);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.footer {
    background: var(--color-dark-bg);
    color: var(--color-text-light);
    text-align: center;
    padding: 30px 20px;
    margin-top: auto;
}

.footer .social-icons {
    margin-bottom: 10px;
}

.footer .social-icons a {
    margin: 0 10px;
    display: inline-block;
}

.footer .social-icons img {
    height: 24px;
    width: 24px;
    transition: opacity 0.3s;
}

.footer .social-icons img:hover {
    opacity: 0.7;
}

.footer p {
    margin: 0;
    font-size: 14px;
}

.graph-help {
    text-align: center;
    padding: 15px;
    background: var(--color-bg-lighter);
    font-size: 13px;
    color: var(--color-text-medium);
    font-style: italic;
}

.error-message {
    text-align: center;
    padding: 40px;
    color: var(--color-error);
    font-size: 16px;
}