:root {
    --bg-glass: rgba(13, 17, 23, 0.65);
    --bg-glass-active: rgba(22, 28, 38, 0.85);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-glow: rgba(56, 189, 248, 0.4);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --color-primary: #38bdf8;
    --color-primary-hover: #0ea5e9;
    --color-accent: #f43f5e;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    --flora-color: #4ade80;
    --herbivore-color: #fbbf24;
    --carnivore-color: #f87171;
}

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

body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: #030712;
    color: var(--text-primary);
    font-family: var(--font-body);
    user-select: none;
    -webkit-user-select: none;
}

/* Three.js Container */
#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* UI Layer Over Canvas */
.ui-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    padding: 16px;
}

/* Interactive elements in UI container must receive events */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    padding: 14px;
    pointer-events: auto;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.6);
}

/* Header UI */
.main-header {
    position: absolute;
    top: 16px;
    left: 16px;
    right: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}

.logo-area h1 {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.logo-area h1 span {
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 14px;
    font-weight: 800;
    border: 1px solid var(--color-primary);
    padding: 1px 5px;
    border-radius: 6px;
    margin-left: 4px;
}

.logo-area p {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 1px;
}

.controls-area {
    display: flex;
    gap: 24px;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.btn-group {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 2px;
}

.btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.btn.active {
    color: var(--color-primary);
    background: rgba(56, 189, 248, 0.1);
}

.btn.active-speed {
    color: #fff;
    background: var(--color-primary);
}

.btn.active-speed:hover {
    background: var(--color-primary-hover);
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-group input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 6px 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 12px;
    outline: none;
    width: 100px;
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--color-primary);
}

/* Performance HUD */
#perf-hud {
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 14px;
    padding: 6px 14px;
    background: rgba(10, 15, 25, 0.62);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    backdrop-filter: blur(8px);
    font-family: monospace;
    font-size: 11px;
    color: #cbd5e1;
    z-index: 50;
    pointer-events: none;
    white-space: nowrap;
}

#perf-hud .perf-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.3;
}

#perf-hud .perf-row span {
    color: #64748b;
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#perf-hud .perf-row b {
    color: #7dd3fc;
    font-weight: 700;
    font-size: 13px;
}

.env-hint {
    font-size: 10px;
    color: var(--text-secondary, #8899aa);
    margin: -4px 0 10px;
    line-height: 1.4;
    min-height: 12px;
}

/* Environment control rows (sliders) */
.env-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 10px;
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
}

.env-row span {
    color: var(--text-primary);
    font-family: monospace;
}

.env-row input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* Procedural Beta toggle (next to seed input) */
.beta-check {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    font-size: 11px;
    color: var(--text-primary);
    cursor: pointer;
    white-space: nowrap;
}

.beta-check input {
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* Graphics quality selector */
.quality-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
}

.quality-row select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 5px 10px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 12px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
}

.quality-row select:focus {
    border-color: var(--color-primary);
}

.quality-row select option {
    background: #0f172a;
    color: #e2e8f0;
}

.btn-primary {
    background: var(--color-primary);
    color: #0f172a;
    border-radius: 8px;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: #0f172a;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

/* Side Panels Positioning */
.side-panel {
    position: absolute;
    top: 92px;
    bottom: 52px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    overflow-y: auto;
    max-height: calc(100vh - 150px);
}

.left-panel {
    left: 16px;
    width: 270px;
}

.left-panel.collapsed {
    transform: translateX(-115%);
    opacity: 0;
    pointer-events: none;
}

.right-panel {
    right: 16px;
    width: 280px;
}

.right-panel.collapsed {
    transform: translateX(115%);
    opacity: 0;
    pointer-events: none;
}

/* Custom Scrollbar for side panels */
.side-panel::-webkit-scrollbar {
    width: 4px;
}
.side-panel::-webkit-scrollbar-track {
    background: transparent;
}
.side-panel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}
.side-panel::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Panel Header and Collapses */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 6px;
    margin-bottom: 4px;
}

.panel-header .panel-title {
    border-bottom: none !important;
    padding-bottom: 0 !important;
    margin-bottom: 0 !important;
}

.panel-title {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 700;
}

.toggle-panel-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 4px;
}

.toggle-panel-btn:hover {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Floating Restore Buttons */
.restore-panel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 28px;
    height: 48px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

#btn-restore-left {
    left: 0;
    border-radius: 0 8px 8px 0;
    border-left: none;
}

#btn-restore-right {
    right: 0;
    border-radius: 8px 0 0 8px;
    border-right: none;
}

.restore-panel-btn:hover {
    background: var(--bg-glass-active);
    color: var(--color-primary);
    width: 34px;
}

.restore-panel-btn.hidden {
    display: none !important;
}

/* Cards & Widgets */
.info-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    padding: 14px;
}

.clock-card {
    text-align: center;
    border-left: 3px solid var(--color-primary);
}

.clock-display {
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--color-primary);
    text-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.date-display {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Stats grid */
.grid-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-box {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-glass);
    border-radius: 10px;
    padding: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-icon {
    font-size: 20px;
}

.stat-info label {
    display: block;
    font-size: 9px;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

.stat-info span {
    font-size: 12px;
    font-weight: 700;
}

.panel-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.panel-section h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.4px;
    color: var(--text-muted);
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.panel-section h3::before {
    content: "";
    width: 3px;
    height: 11px;
    background: var(--color-primary);
    border-radius: 2px;
    flex-shrink: 0;
}

/* Preset row highlighted at the top of the graphics panel */
.preset-row {
    background: rgba(56, 189, 248, 0.06);
    border: 1px solid rgba(56, 189, 248, 0.18);
    border-radius: 10px;
    padding: 8px 10px;
    margin-bottom: 2px;
}

.preset-row label {
    font-weight: 700;
    color: var(--text-primary);
}

/* Toggles */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toggle-switch {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    cursor: pointer;
    color: var(--text-secondary);
}

.toggle-switch input {
    display: none;
}

.toggle-switch .slider {
    width: 32px;
    height: 18px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-glass);
    border-radius: 9px;
    position: relative;
    transition: 0.3s;
    flex-shrink: 0;
}

.toggle-switch .slider:before {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked + .slider {
    background-color: var(--color-primary);
}

.toggle-switch input:checked + .slider:before {
    transform: translateX(14px);
}

/* Scale bar */
.scale-bar {
    margin-top: auto;
    padding-top: 10px;
}

.scale-line {
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 50%, rgba(255,255,255,0.1) 50%);
    border-radius: 2px;
    margin-bottom: 6px;
}

.scale-label {
    font-size: 10px;
    color: var(--text-muted);
    text-align: center;
}

/* Inspector styles */
.inspector-card {
    border-left: 3px solid var(--text-secondary);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: border-color 0.3s;
}

.inspector-card.active-inspect {
    border-color: var(--color-primary);
}

.help-text {
    font-size: 11px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.5;
}

.inspector-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}

.inspector-header h3 {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
}

.inspector-header span {
    font-size: 10px;
    color: var(--text-muted);
}

.inspector-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
    margin-bottom: 12px;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
    padding-bottom: 12px;
}

.inspect-item label {
    display: block;
    font-size: 9px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.inspect-item span {
    font-size: 12px;
    font-weight: 600;
}

.inspect-entities h4 {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.inspect-entities ul {
    list-style: none;
    font-size: 11px;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.inspect-entities li {
    background: rgba(255, 255, 255, 0.03);
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.hidden {
    display: none !important;
}

/* Graph / Charts */
.chart-container {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    border-radius: 10px;
    padding: 8px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-legend {
    display: flex;
    justify-content: space-around;
    font-size: 10px;
    margin-top: 4px;
}

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

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.legend-dot.flora { background: var(--flora-color); }
.legend-dot.herbivore { background: var(--herbivore-color); }
.legend-dot.carnivore { background: var(--carnivore-color); }

.grid-btns {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
}

.btn-sm {
    padding: 6px 4px;
    font-size: 10px;
}

/* Instructions Overlay */
.help-panel {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    text-align: center;
    font-size: 10px;
    color: var(--text-secondary);
    border-radius: 10px;
    width: auto;
    max-width: 90%;
}

/* Utilities */
button, input {
    pointer-events: auto;
}

/* --- Steve mode: crosshair --- */
#crosshair {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 14px;
    height: 14px;
    transform: translate(-50%, -50%);
    z-index: 25;
    pointer-events: none;
    opacity: 0.85;
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.8));
}

#crosshair::before, #crosshair::after {
    content: "";
    position: absolute;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 1px;
}

#crosshair::before { left: 6px; top: 0; width: 2px; height: 14px; }
#crosshair::after  { top: 6px; left: 0; width: 14px; height: 2px; }

/* --- Steve mode: Minecraft-style hotbar --- */
#hotbar {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0;
    padding: 3px;
    /* dark stone-gray bar with the classic light bevel */
    background: #8b8b8b;
    border: 3px solid #373737;
    border-top-color: #5a5a5a;
    border-left-color: #5a5a5a;
    box-shadow: 0 0 0 2px #1d1d1d, 3px 3px 0 2px rgba(0,0,0,0.45);
    border-radius: 3px;
    z-index: 30;
    pointer-events: auto;
    image-rendering: pixelated;
}

.hotbar-slot {
    position: relative;
    width: 52px;
    height: 52px;
    /* inset slot: dark base with a bevel (light bottom-right, dark top-left) */
    background: #8b8b8b;
    border: 2px solid #373737;
    border-right-color: #ffffff;
    border-bottom-color: #ffffff;
    margin: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: none;
    user-select: none;
    image-rendering: pixelated;
}

.hotbar-slot:hover { filter: brightness(1.12); }

/* selected slot: thick white frame that overflows the bar, like Minecraft */
.hotbar-slot.sel {
    outline: 4px solid #f8f8f8;
    outline-offset: 1px;
    z-index: 2;
    box-shadow: 0 0 0 2px #2b2b2b;
}

.hotbar-slot .slot-icon {
    width: 34px;
    height: 34px;
    image-rendering: pixelated;
    filter: drop-shadow(2px 2px 0 rgba(0,0,0,0.45));
}

/* item name label (hidden — MC only shows the count/number) */
.hotbar-slot > span:not(.slot-key) { display: none; }

.hotbar-slot .slot-key {
    position: absolute;
    top: 1px;
    right: 3px;
    font-size: 11px;
    color: #ffffff;
    font-family: monospace;
    font-weight: 700;
    text-shadow: 1.5px 1.5px 0 #3a3a3a;
    pointer-events: none;
}