:root {
    --bg: #f3f1eb;
    --panel: #fffdf8;
    --panel-strong: #f8f3e8;
    --border: #d8cfbd;
    --text: #1d1a16;
    --muted: #6f665b;
    --accent: #0f766e;
    --accent-strong: #115e59;
    --alert: #b45309;
    --shadow: 0 16px 40px rgba(44, 34, 18, 0.08);
}

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

body {
    font-family: "Segoe UI", "Noto Sans KR", sans-serif;
    background: linear-gradient(180deg, #efe8d8 0%, var(--bg) 24%, #ebe7df 100%);
    color: var(--text);
    min-height: 100vh;
}

button,
input,
textarea {
    font: inherit;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
    padding: 24px 28px;
    border-bottom: 1px solid rgba(29, 26, 22, 0.08);
    background: rgba(255, 253, 248, 0.85);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 5;
}

.eyebrow {
    color: var(--accent-strong);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 12px;
    margin-bottom: 6px;
}

.topbar h1 {
    font-size: 28px;
}

.topbar-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.topbar-meta span,
.chip {
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--panel-strong);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 13px;
}

.layout {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 20px;
    padding: 20px;
    min-height: calc(100vh - 96px);
}

.sidebar,
.content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 0;
}

.panel {
    background: rgba(255, 253, 248, 0.94);
    border: 1px solid rgba(216, 207, 189, 0.9);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 20px;
}

.panel-heading {
    margin-bottom: 16px;
}

.panel-heading h2 {
    font-size: 20px;
    margin-bottom: 6px;
}

.panel-heading p,
.meta-line,
.empty-state {
    color: var(--muted);
    line-height: 1.6;
}

.paper-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 320px;
    overflow-y: auto;
}

.paper-item {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
    text-align: left;
    padding: 14px;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.paper-item:hover,
.paper-item.active {
    transform: translateY(-1px);
    border-color: var(--accent);
    background: #f6fffd;
}

.paper-item h3 {
    font-size: 16px;
    margin-bottom: 6px;
}

.paper-item p {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.paper-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.paper-form label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 14px;
}

.paper-form input,
.paper-form textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px 14px;
    background: #fff;
}

.paper-form textarea {
    resize: vertical;
}

.paper-form button {
    border: none;
    border-radius: 14px;
    padding: 14px 16px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
}

.paper-form button:hover {
    background: var(--accent-strong);
}

.grid-two {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.detail-panel {
    min-height: 340px;
}

.paper-title {
    font-size: 30px;
    margin-bottom: 10px;
}

.detail-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 18px;
}

.detail-summary {
    background: var(--panel-strong);
    border-left: 4px solid var(--accent);
    border-radius: 16px;
    padding: 16px;
    line-height: 1.7;
    margin-bottom: 18px;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.detail-card {
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.78);
}

.detail-card.alert {
    background: #fff5eb;
    border-color: #efcfaa;
}

.detail-card h3 {
    margin-bottom: 10px;
    font-size: 16px;
}

.detail-card ul {
    padding-left: 18px;
    line-height: 1.7;
}

.detail-card li + li {
    margin-top: 4px;
}

.relation-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.graph-panel {
    flex: 1;
    min-height: 460px;
    display: flex;
    flex-direction: column;
}

#cy {
    width: 100%;
    min-height: 420px;
    flex: 1;
    border-radius: 16px;
    background:
        radial-gradient(circle at top left, rgba(15, 118, 110, 0.12), transparent 30%),
        linear-gradient(180deg, #fffdfa 0%, #f4efe3 100%);
    border: 1px solid rgba(216, 207, 189, 0.7);
}

@media (max-width: 1120px) {
    .layout {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 720px) {
    .topbar {
        padding: 20px;
        align-items: flex-start;
        flex-direction: column;
    }

    .layout {
        padding: 16px;
    }

    .grid-two,
    .detail-header {
        grid-template-columns: 1fr;
        display: grid;
    }
}