/* ============================================================
   Netzwerktopologie-Simulator – Glassmorphism Galaxy Theme
   ============================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #0a0e1a;
    --bg-panel: rgba(15, 20, 40, 0.65);
    --bg-panel-solid: #0f1428;
    --bg-inner: rgba(20, 28, 58, 0.55);
    --glass-border: rgba(100, 140, 255, 0.15);
    --glass-highlight: rgba(120, 160, 255, 0.08);
    --text: #e0e8f8;
    --text-muted: #7a8bb0;
    --accent: #6ea8fe;
    --accent-glow: rgba(110, 168, 254, 0.35);
    --accent-dark: #3b6fd4;
    --success: #5de0a3;
    --success-glow: rgba(93, 224, 163, 0.3);
    --warning: #ffb74d;
    --danger: #ff6b6b;
    --danger-glow: rgba(255, 107, 107, 0.3);
    --border: rgba(80, 120, 200, 0.12);
    --node-fill: #6ea8fe;
    --node-stroke: #3b6fd4;
    --edge-color: rgba(100, 130, 180, 0.6);
    --edge-disabled: rgba(255, 107, 107, 0.45);
    --edge-bridge: #ffb74d;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --blur: 16px;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}

/* Galaxy background */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(50, 80, 180, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(120, 60, 200, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 60% 80%, rgba(40, 100, 160, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 30% 30%, rgba(80, 120, 255, 0.06) 0%, transparent 30%),
        radial-gradient(circle at 70% 70%, rgba(100, 50, 200, 0.06) 0%, transparent 30%);
    pointer-events: none;
    z-index: 0;
}

/* Stars */
body::after {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 25% 35%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 40% 10%, rgba(255,255,255,0.25), transparent),
        radial-gradient(1px 1px at 55% 45%, rgba(255,255,255,0.35), transparent),
        radial-gradient(1px 1px at 70% 20%, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 85% 55%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 15% 65%, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 50% 75%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 35% 90%, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 80% 85%, rgba(255,255,255,0.25), transparent),
        radial-gradient(2px 2px at 5% 50%, rgba(180,200,255,0.4), transparent),
        radial-gradient(2px 2px at 95% 40%, rgba(180,200,255,0.3), transparent);
    pointer-events: none;
    z-index: 0;
}

/* ---------- Glassmorphism base ---------- */
.glass {
    background: var(--bg-panel);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow), inset 0 1px 0 var(--glass-highlight);
}

.glass-inner {
    background: var(--bg-inner);
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
}

/* ---------- Header ---------- */
#app-header {
    position: relative;
    z-index: 1;
    background: rgba(15, 20, 45, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 10px 24px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
#app-header h1 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: .5px;
    background: linear-gradient(135deg, var(--accent), #a78bfa, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
#app-header .subtitle { font-size: .78rem; color: var(--text-muted); margin-top: 2px; }

/* ---------- App Container (3-column) ---------- */
#app-container {
    display: flex;
    height: calc(100vh - 100px);
    overflow: hidden;
    position: relative;
    z-index: 1;
}

/* ---------- Panels (left / right) ---------- */
.panel {
    width: 280px;
    min-width: 240px;
    padding: 14px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-radius: 0;
}
.panel h2 {
    font-size: 1rem;
    color: var(--accent);
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 6px;
    margin-bottom: 6px;
    text-shadow: 0 0 20px var(--accent-glow);
}
.panel h3 {
    font-size: .82rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .5px;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-section {
    border-radius: var(--radius-sm);
    padding: 10px;
    margin-bottom: 8px;
}

/* ---------- Advanced Mode Toggle ---------- */
.advanced-toggle-section {
    padding: 8px 10px;
    margin-bottom: 10px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(60, 30, 120, 0.3), rgba(30, 60, 140, 0.3));
    border: 1px solid rgba(120, 80, 220, 0.25);
}

.toggle-switch {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}
.toggle-switch input { display: none; }
.toggle-slider {
    position: relative;
    width: 40px; height: 20px;
    background: rgba(60, 70, 100, 0.6);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: all .3s ease;
    flex-shrink: 0;
}
.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 14px; height: 14px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all .3s ease;
}
.toggle-switch input:checked + .toggle-slider {
    background: rgba(60, 100, 200, 0.5);
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}
.toggle-switch input:checked + .toggle-slider::after {
    transform: translateX(20px);
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}
.toggle-switch.small .toggle-slider { width: 34px; height: 17px; }
.toggle-switch.small .toggle-slider::after { width: 11px; height: 11px; }
.toggle-switch.small input:checked + .toggle-slider::after { transform: translateX(17px); }
.toggle-label { font-size: .82rem; color: var(--text); }

/* ---------- Buttons ---------- */
button {
    display: block;
    width: 100%;
    padding: 8px 12px;
    margin-bottom: 6px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: rgba(30, 45, 80, 0.5);
    color: var(--text);
    font-size: .82rem;
    cursor: pointer;
    transition: all .2s ease;
    text-align: left;
    backdrop-filter: blur(8px);
}
button:hover {
    background: rgba(60, 100, 200, 0.3);
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
    transform: translateY(-1px);
}
button:active { transform: scale(.97) translateY(0); }
button.active {
    background: rgba(60, 100, 200, 0.4);
    border-color: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow), inset 0 0 8px rgba(110, 168, 254, 0.1);
}

/* ---------- Form elements ---------- */
.form-group { margin-bottom: 6px; }
.form-group label { display: block; font-size: .75rem; color: var(--text-muted); margin-bottom: 3px; }
.form-group select, .form-group input[type="number"] {
    width: 100%;
    padding: 6px 8px;
    background: rgba(10, 14, 30, 0.6);
    color: var(--text);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: .82rem;
    backdrop-filter: blur(4px);
}
.form-group input[type="number"] { width: 60px; }

/* ---------- Hints ---------- */
.hints { list-style: none; font-size: .75rem; color: var(--text-muted); }
.hints li { margin-bottom: 5px; padding-left: 12px; position: relative; }
.hints li::before { content: '•'; position: absolute; left: 0; color: var(--accent); }
.hint-text { font-size: .75rem; color: var(--text-muted); margin-bottom: 6px; }

/* ---------- Info boxes ---------- */
.info-box {
    background: rgba(10, 14, 30, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: .78rem;
    margin-top: 6px;
    line-height: 1.5;
    backdrop-filter: blur(4px);
}
.info-box.success { border-color: var(--success); color: var(--success); box-shadow: 0 0 8px var(--success-glow); }
.info-box.warning { border-color: var(--warning); color: var(--warning); }
.info-box.danger { border-color: var(--danger); color: var(--danger); box-shadow: 0 0 8px var(--danger-glow); }

/* ---------- Canvas ---------- */
#canvas-container {
    flex: 1;
    position: relative;
    background: transparent;
    overflow: hidden;
}
#canvas-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: radial-gradient(circle, rgba(80, 120, 200, 0.08) 1px, transparent 1px);
    background-size: 30px 30px;
    pointer-events: none;
}
#network-svg {
    width: 100%;
    height: 100%;
    cursor: crosshair;
    position: relative;
    z-index: 1;
}

#canvas-status-bar {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    background: rgba(10, 14, 30, 0.75);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    padding: 5px 14px;
    font-size: .75rem;
    color: var(--text-muted);
    display: flex;
    gap: 20px;
    z-index: 2;
}

#mode-indicator.delete-mode { color: var(--danger); font-weight: 600; text-shadow: 0 0 10px var(--danger-glow); }
#mode-indicator.failure-mode { color: var(--warning); font-weight: 600; }

/* ---------- Adjacency Matrix Overlay ---------- */
#matrix-overlay {
    position: absolute;
    top: 10px; right: 10px;
    max-width: 400px;
    max-height: 50vh;
    overflow: auto;
    border-radius: var(--radius);
    padding: 14px;
    z-index: 10;
}
#matrix-overlay h3 { margin-bottom: 8px; color: var(--accent); }
#matrix-content table {
    border-collapse: collapse;
    font-size: .72rem;
    font-family: 'Consolas', 'Courier New', monospace;
}
#matrix-content td, #matrix-content th {
    padding: 3px 8px;
    border: 1px solid var(--glass-border);
    text-align: center;
    min-width: 28px;
}
#matrix-content th {
    background: rgba(60, 100, 200, 0.15);
    color: var(--accent);
    font-weight: 600;
}
#matrix-content td.cell-1 { color: var(--accent); font-weight: 700; }
#matrix-content td.cell-weight { color: var(--warning); font-weight: 600; }

/* ---------- SVG Node & Edge styles ---------- */
.node-group { cursor: grab; }
.node-group:active { cursor: grabbing; }
.node-circle {
    fill: var(--node-fill);
    stroke: var(--node-stroke);
    stroke-width: 2.5;
    transition: fill .15s, stroke .15s, r .15s;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}
.node-circle:hover { fill: #8bbdfe; r: 24; }
.node-circle.selected {
    stroke: #fff;
    stroke-width: 3;
    fill: #4d94fc;
    filter: drop-shadow(0 0 14px var(--accent-glow));
}
.node-circle.articulation {
    stroke: var(--warning);
    stroke-width: 3.5;
    stroke-dasharray: 5 2;
}
.node-circle.sim-active {
    fill: var(--success);
    stroke: #3db87d;
    filter: drop-shadow(0 0 14px var(--success-glow));
}
.node-circle.colored {
    stroke-width: 2;
}
.node-label {
    fill: #fff;
    font-size: 13px;
    font-weight: 700;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
    user-select: none;
}

.edge-line {
    stroke: var(--edge-color);
    stroke-width: 2.5;
    stroke-linecap: round;
    transition: stroke .2s, stroke-width .2s;
    cursor: pointer;
}
.edge-line:hover { stroke: var(--accent); stroke-width: 3.5; }
.edge-line.disabled {
    stroke: var(--edge-disabled);
    stroke-dasharray: 8 4;
    stroke-width: 2;
}
.edge-line.bridge {
    stroke: var(--edge-bridge);
    stroke-width: 3;
    filter: drop-shadow(0 0 4px rgba(255, 183, 77, 0.4));
}
.edge-line.sim-active {
    stroke: var(--success);
    stroke-width: 4;
    filter: drop-shadow(0 0 8px var(--success-glow));
}
.edge-line.sim-flood {
    stroke: var(--accent);
    stroke-width: 3.5;
    filter: drop-shadow(0 0 6px var(--accent-glow));
}
.edge-line.dfs-active {
    stroke: #a78bfa;
    stroke-width: 4;
    filter: drop-shadow(0 0 8px rgba(167, 139, 250, 0.5));
}
.node-circle.dfs-active {
    fill: #a78bfa;
    stroke: #7c5cbf;
    filter: drop-shadow(0 0 12px rgba(167, 139, 250, 0.5));
}

.edge-hit-area {
    stroke: transparent;
    stroke-width: 16;
    fill: none;
    cursor: pointer;
    pointer-events: stroke;
}

.edge-weight-label {
    fill: var(--warning);
    font-size: 11px;
    font-weight: 700;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
    filter: drop-shadow(0 0 3px rgba(0,0,0,0.8));
}
.edge-weight-bg {
    fill: rgba(10, 14, 30, 0.75);
    rx: 4;
}

/* Sim packet */
.sim-packet {
    fill: var(--success);
    filter: drop-shadow(0 0 10px var(--success-glow));
}

/* ---------- Analysis (right panel) ---------- */
.analysis-section {
    border-radius: var(--radius-sm);
    padding: 10px;
    margin-bottom: 8px;
}

#stats-table { width: 100%; font-size: .78rem; border-collapse: collapse; }
#stats-table td { padding: 3px 0; }
#stats-table td:first-child { color: var(--text-muted); }
#stats-table td:last-child { text-align: right; font-weight: 600; }

.degree-list {
    font-size: .78rem;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}
.degree-badge {
    background: rgba(10, 14, 30, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    padding: 2px 8px;
    font-size: .75rem;
}

#bridges-list, #articulation-list {
    font-size: .78rem;
    color: var(--text-muted);
}
.bridge-badge { color: var(--warning); font-weight: 600; margin-right: 4px; }
.artic-badge { color: var(--warning); font-weight: 600; margin-right: 4px; }

/* Topology */
.topology-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(60, 100, 200, 0.4), rgba(120, 60, 200, 0.3));
    border: 1px solid var(--glass-border);
    color: #fff;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: .82rem;
    font-weight: 600;
    margin-bottom: 8px;
    box-shadow: 0 0 12px var(--accent-glow);
}

/* Discovered topologies */
.discovered-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.discovered-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(30, 50, 90, 0.5);
    border: 1px solid var(--glass-border);
    color: var(--accent);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: .72rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s ease;
}
.discovered-badge:hover {
    background: rgba(60, 100, 200, 0.3);
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    transform: scale(1.05);
}
.discovered-badge .badge-icon { font-size: .85rem; }

/* Traversal result */
#traversal-result {
    font-size: .78rem;
    color: var(--text-muted);
    line-height: 1.5;
}
.traversal-order {
    display: flex;
    flex-wrap: wrap;
    gap: 3px;
    margin-top: 4px;
}
.traversal-step {
    background: rgba(60, 100, 200, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    padding: 2px 6px;
    font-size: .72rem;
    font-weight: 600;
    color: var(--accent);
}
.traversal-step.dfs-step { color: #a78bfa; border-color: rgba(167, 139, 250, 0.3); background: rgba(120, 80, 200, 0.15); }

/* ---------- Topology Info Popup ---------- */
#topology-popup {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
}
.topology-popup-backdrop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(5, 8, 18, 0.7);
    backdrop-filter: blur(6px);
}
.topology-popup-content {
    position: relative;
    width: 500px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    border-radius: var(--radius);
    padding: 28px 32px;
    animation: popupIn .3s ease;
}
@keyframes popupIn {
    from { opacity: 0; transform: scale(.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.popup-close {
    position: absolute;
    top: 12px; right: 16px;
    width: auto;
    padding: 4px 10px;
    margin: 0;
    font-size: 1.1rem;
    background: transparent;
    border: none;
}
.popup-close:hover { background: rgba(255,100,100,0.2); color: var(--danger); }
#topo-popup-title {
    font-size: 1.3rem;
    color: var(--accent);
    margin-bottom: 16px;
    text-shadow: 0 0 20px var(--accent-glow);
}
.topo-popup-body { display: flex; flex-direction: column; gap: 12px; }
.topo-field {
    background: var(--bg-inner);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
}
.topo-label {
    display: block;
    font-size: .75rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.topo-field p {
    font-size: .82rem;
    color: var(--text);
    line-height: 1.5;
}

/* ---------- Weight Dialog ---------- */
#weight-dialog {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 250;
    display: flex;
    align-items: center;
    justify-content: center;
}
.weight-dialog-backdrop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(5, 8, 18, 0.6);
}
.weight-dialog-content {
    position: relative;
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    min-width: 260px;
}
.weight-dialog-content h3 { color: var(--accent); margin-bottom: 8px; }
.weight-dialog-content p { font-size: .82rem; color: var(--text-muted); margin-bottom: 12px; }
.weight-dialog-content input {
    width: 80px;
    padding: 8px;
    font-size: 1.1rem;
    text-align: center;
    background: rgba(10, 14, 30, 0.7);
    color: var(--text);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
}
.weight-dialog-buttons { display: flex; gap: 8px; justify-content: center; }
.weight-dialog-buttons button { width: auto; padding: 6px 20px; }

/* ---------- Gamification ---------- */
#gamification-bar {
    position: fixed;
    bottom: 24px; left: 0; right: 0;
    background: rgba(10, 14, 30, 0.8);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--glass-border);
    padding: 6px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 100;
}
#gamification-bar button {
    width: auto;
    padding: 5px 14px;
    margin: 0;
    font-size: .78rem;
}

#progress-bar-container {
    flex: 1;
    max-width: 320px;
    height: 16px;
    background: rgba(20, 28, 50, 0.6);
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
}
#progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-dark), var(--accent), #a78bfa);
    border-radius: 10px;
    width: 0%;
    transition: width .4s ease;
    box-shadow: 0 0 12px var(--accent-glow);
}
#progress-text {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: .65rem;
    color: var(--text);
    font-weight: 600;
}

/* Task Panel */
#task-panel {
    position: fixed;
    bottom: 42px; left: 16px;
    width: 380px;
    max-height: 50vh;
    border-radius: var(--radius);
    overflow-y: auto;
    z-index: 101;
}
.task-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--glass-border);
}
.task-panel-header h3 { font-size: .9rem; color: var(--accent); }
.task-panel-header button { width: auto; padding: 2px 8px; margin: 0; font-size: .9rem; }

#task-list {
    list-style: none;
    padding: 8px 14px;
}
#task-list li {
    padding: 8px 10px;
    margin-bottom: 6px;
    border-radius: var(--radius-sm);
    background: var(--bg-inner);
    border: 1px solid var(--glass-border);
    font-size: .78rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: border-color .2s, box-shadow .2s;
}
#task-list li.completed {
    border-color: var(--success);
    box-shadow: 0 0 8px var(--success-glow);
    opacity: .75;
}
#task-list li .task-check {
    width: 18px; height: 18px;
    border-radius: 50%;
    border: 2px solid var(--glass-border);
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: .65rem;
}
#task-list li.completed .task-check {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
    box-shadow: 0 0 6px var(--success-glow);
}

/* ---------- Feedback Popup ---------- */
#feedback-popup {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(.85);
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s, transform .3s;
}
#feedback-popup .feedback-content {
    border-radius: 16px;
    padding: 30px 40px;
    text-align: center;
    border-color: var(--accent);
    box-shadow: 0 0 40px var(--accent-glow), 0 8px 32px rgba(0,0,0,0.4);
}
#feedback-popup.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}
#feedback-icon { font-size: 2.5rem; display: block; margin-bottom: 10px; }
#feedback-text { font-size: .95rem; line-height: 1.5; }

/* ---------- Utility ---------- */
.hidden { display: none !important; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
    .panel { width: 220px; min-width: 180px; }
}
@media (max-width: 800px) {
    #app-container { flex-direction: column; }
    .panel { width: 100%; min-width: auto; max-height: 30vh; flex-direction: row; flex-wrap: wrap; }
    #canvas-container { min-height: 40vh; }
}

/* scrollbar styling */
.panel::-webkit-scrollbar, #matrix-overlay::-webkit-scrollbar, .topology-popup-content::-webkit-scrollbar { width: 5px; }
.panel::-webkit-scrollbar-track, #matrix-overlay::-webkit-scrollbar-track { background: transparent; }
.panel::-webkit-scrollbar-thumb, #matrix-overlay::-webkit-scrollbar-thumb {
    background: rgba(80, 120, 200, 0.2);
    border-radius: 4px;
}
.panel::-webkit-scrollbar-thumb:hover { background: rgba(80, 120, 200, 0.4); }

/* ---------- Color palette for graph coloring ---------- */
.color-0 { fill: #6ea8fe; }
.color-1 { fill: #ff6b6b; }
.color-2 { fill: #5de0a3; }
.color-3 { fill: #ffb74d; }
.color-4 { fill: #a78bfa; }
.color-5 { fill: #f06292; }
.color-6 { fill: #4dd0e1; }
.color-7 { fill: #aed581; }

/* ---------- Language Switcher ---------- */
#lang-switcher {
    position: absolute;
    top: 10px;
    right: 18px;
    display: flex;
    gap: 4px;
    z-index: 10;
}
.lang-flag {
    background: rgba(30, 40, 70, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    font-size: 1.15rem;
    padding: 3px 6px;
    cursor: pointer;
    transition: all .25s ease;
    line-height: 1;
    opacity: 0.55;
    /* Override generic button styles */
    display: inline-flex;
    width: auto;
    margin: 0;
    text-align: center;
    backdrop-filter: none;
}
.lang-flag:hover {
    opacity: 0.85;
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}
.lang-flag.active {
    opacity: 1;
    border-color: var(--accent);
    background: rgba(60, 100, 200, 0.25);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* ---------- Info Buttons ---------- */
.info-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    background: rgba(60, 100, 200, 0.15);
    color: var(--accent);
    font-size: .7rem;
    font-weight: 700;
    cursor: pointer;
    margin-left: 6px;
    margin-bottom: 0;
    padding: 0;
    vertical-align: middle;
    transition: all .25s ease;
    line-height: 1;
    /* Override generic button styles */
    text-align: center;
    backdrop-filter: none;
}
.info-btn:hover {
    background: rgba(60, 100, 200, 0.35);
    box-shadow: 0 0 10px var(--accent-glow);
    transform: scale(1.1);
    border-color: var(--accent);
}
.info-btn-inline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    background: rgba(60, 100, 200, 0.15);
    color: var(--accent);
    font-size: .6rem;
    font-weight: 700;
    cursor: pointer;
    margin-left: 5px;
    vertical-align: middle;
    transition: all .25s ease;
    line-height: 1;
}
.info-btn-inline:hover {
    background: rgba(60, 100, 200, 0.35);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* ---------- Mascot Info Popup ---------- */
#mascot-popup {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.mascot-popup-backdrop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(5, 8, 20, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.mascot-popup-content {
    position: relative;
    z-index: 1;
    max-width: 520px;
    width: 90%;
    border-radius: var(--radius);
    padding: 24px;
    animation: popupIn .3s ease;
}
.mascot-popup-body {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}
.mascot-img {
    width: 90px;
    height: auto;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    filter: drop-shadow(0 0 12px rgba(110, 168, 254, 0.3));
}
.mascot-text {
    font-size: .88rem;
    line-height: 1.6;
    color: var(--text);
}
.mascot-text h4 {
    color: var(--accent);
    margin-bottom: 8px;
    font-size: .95rem;
}
.mascot-text p {
    margin-bottom: 6px;
}

/* ---------- Footer ---------- */
#site-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    text-align: center;
    padding: 5px 16px;
    font-size: .65rem;
    color: var(--text-muted);
    background: rgba(10, 14, 26, 0.75);
    border-top: 1px solid rgba(110, 168, 254, 0.08);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    letter-spacing: .3px;
    opacity: .6;
    transition: opacity .3s ease;
}
#site-footer:hover {
    opacity: 1;
}
#site-footer p {
    margin: 0;
}
#site-footer a {
    color: var(--accent);
    text-decoration: none;
    opacity: .75;
    transition: opacity .25s ease;
}
#site-footer a:hover {
    opacity: 1;
    text-decoration: underline;
}