:root {
    --bg-color: #050510;
    --panel-bg: rgba(20, 20, 35, 0.6);
    --panel-border: rgba(255, 255, 255, 0.1);
    --accent: #8bf;
    --text-main: #eee;
    --text-muted: #aaa;
    --font-main: 'Outfit', sans-serif;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-main);
}

#app-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100vw;
    height: 100vh;
    position: relative;
}

.viewport {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* Stack observer canvases (3D + 2D panorama overlay) */
#view-observer canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* Force 16:9 aspect ratio for 3D panorama mode */
#view-observer.panorama-mode #canvas-observer {
    width: 100% !important;
    height: 56.25% !important;
    /* 9/16 of viewport height */
    top: 50% !important;
    left: 0 !important;
    transform: translateY(-50%) !important;
}

#canvas-panorama {
    display: none;
    z-index: 2;
    pointer-events: none;
}

#canvas-observer {
    z-index: 1;
}

.viewport canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.viewport .label {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--panel-bg);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9em;
    backdrop-filter: blur(10px);
    border: 1px solid var(--panel-border);
    z-index: 10;
    color: var(--text-muted);
    font-weight: 300;
    pointer-events: none;
}

/* Mode Selector for Observer View */
.mode-selector {
    display: flex;
    gap: 6px;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.mode-btn {
    width: 34px;
    height: 34px;
    font-size: 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.mode-btn.active {
    background: rgba(136, 187, 255, 0.4);
    border-color: rgba(136, 187, 255, 0.8);
    box-shadow: 0 0 10px rgba(136, 187, 255, 0.5);
}

.follow-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--panel-bg);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.8em;
    backdrop-filter: blur(10px);
    border: 1px solid var(--panel-border);
    color: var(--accent);
}

.follow-control input {
    cursor: pointer;
    accent-color: var(--accent);
}

.follow-control label {
    cursor: pointer;
    user-select: none;
}

/* UI Overlay - Centered Floating Panel */
#ui-overlay {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    background: rgba(10, 10, 18, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    padding: 24px;
    z-index: 100;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* Window Controls (Min/Max) */
.panel-window-controls {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    gap: 4px;
}

.panel-window-controls button,
#btn-settings {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-muted);
    width: 20px;
    height: 20px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    font-size: 10px;
    transition: all 0.2s;
}

.panel-window-controls button:hover,
#btn-settings:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border-color: var(--accent);
}

#btn-settings {
    position: absolute;
    top: 12px;
    right: 12px;
}

/* Minimized State */
#ui-overlay.minimized {
    width: 220px;
    padding: 16px;
    padding-top: 40px;
    /* Space for controls */
    gap: 8px;
    border-radius: 16px;
}

#ui-overlay.minimized h1 {
    display: none;
}

#ui-overlay.minimized .info-panel,
#ui-overlay.minimized #season-map-container,
#ui-overlay.minimized .toggle-group,
#ui-overlay.minimized .control-group:has(#lat-slider) {
    display: none;
}

/* Adjust labels in minimized mode */
#ui-overlay.minimized .control-group label {
    font-size: 0.8rem;
    margin-bottom: 0;
}

/* In minimize mode, hide minimize button, show maximize button (and vice versa) */
#ui-overlay:not(.minimized) #btn-maximize-panel {
    display: none;
}

#ui-overlay.minimized #btn-minimize-panel {
    display: none;
}

#ui-overlay h1 {
    margin: 0 0 8px 0;
    font-size: 1.2rem;
    text-align: center;
    font-weight: 600;
    background: linear-gradient(to right, #fff, #8bf);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.control-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.control-group label span {
    color: var(--accent);
    font-weight: 600;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 0 10px rgba(136, 187, 255, 0.5);
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

/* Moon Slider Track and Markers */
.slider-container {
    position: relative;
    width: 100%;
    height: 24px;
    display: flex;
    align-items: center;
}

#moon-track {
    position: absolute;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    z-index: 0;
    pointer-events: none;
}

.moon-marker {
    position: absolute;
    top: 6px;
    /* Centering/Visibility in 24px container */
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    z-index: 101;
    pointer-events: none;
    display: none;
    /* Shown via JS */
}

#moon-rise-marker {
    border-bottom: 12px solid #fff;
    /* Pointing UP */
}

#moon-set-marker {
    border-top: 12px solid #fff;
    /* Pointing DOWN */
}

/* Ensure range input is on top of track but markers on top of input? 
   Thumb is z-index auto. Track is background. 
   Input needs to be transparent background. */
#hour-slider {
    z-index: 100;
    position: relative;
}

#hour-slider::-webkit-slider-runnable-track {
    background: transparent !important;
}

.info-panel {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    gap: 12px;
    align-items: center;
    font-size: 0.8rem;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

#moon-phase-visual {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#illumination {
    text-align: right;
}

#moon-phase-visual svg {
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.15));
}

.moon-svg-bg {
    fill: rgba(255, 255, 255, 0.05);
}

.moon-svg-lit {
    fill: #fff;
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.4));
}

.control-group-buttons {
    margin-top: 4px;
}

.label-mini-static {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.button-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 6px;
}

.button-row button {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 6px 2px;
    border-radius: 6px;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-main);
}

.button-row button:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: var(--accent);
}

#season-map-container {
    height: 140px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    margin-top: 8px;
}

#season-map-container .label-mini {
    position: absolute;
    top: 4px;
    left: 8px;
    font-size: 0.6rem;
    opacity: 0.5;
}

#canvas-season {
    width: 100%;
    height: 100%;
}

.overlay-controls-top-right {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 50;
    display: flex;
    gap: 8px;
}

.overlay-controls-top-right button {
    background: var(--panel-bg);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 0.75rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--panel-border);
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
    font-family: var(--font-main);
}

.overlay-controls-top-right button:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: var(--accent);
}

/* Reference Frame Selector */
.ref-frame-selector {
    display: flex;
    gap: 6px;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.ref-btn {
    width: 40px;
    height: 40px;
    font-size: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

#btn-ref-helio {
    font-size: 28px;
    padding-bottom: 2px;
    /* slight visual adjustment for center alignment */
}

.ref-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.ref-btn.active {
    background: rgba(100, 150, 255, 0.4);
    border-color: rgba(100, 150, 255, 0.8);
    box-shadow: 0 0 12px rgba(100, 150, 255, 0.6);
}

/* Camera Presets */
.camera-presets {
    display: flex;
    gap: 4px;
}

.camera-presets button {
    padding: 8px 14px;
    font-size: 0.75rem;
}

.button-row,
.control-group-buttons {
    display: none;
}

.toggle-group {
    display: flex;
    justify-content: center;
    margin-top: 4px;
}

.toggle-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    transition: all 0.2s;
    width: 100%;
    margin-top: 4px;
}

.toggle-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: var(--accent);
}

.toggle-btn.active {
    background: rgba(136, 187, 255, 0.2);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 10px rgba(136, 187, 255, 0.3);
}

/* Settings Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 24px;
    width: 300px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.modal.hidden .modal-content {
    transform: scale(0.9);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 10px;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: #fff;
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.close-btn:hover {
    color: #fff;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.setting-item input[type="number"] {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 8px 12px;
    color: #fff;
    font-family: var(--font-main);
    font-size: 1rem;
    outline: none;
}

.setting-item input[type="number"]:focus {
    border-color: var(--accent);
}

/* Custom Checkbox */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    color: var(--text-main);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 20px;
    width: 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.2s;
}

.checkbox-container:hover input~.checkmark {
    background-color: rgba(255, 255, 255, 0.2);
}

.checkbox-container input:checked~.checkmark {
    background-color: var(--accent);
    border-color: var(--accent);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked~.checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.sub-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 30px;
    /* Indent under textbox/checkbox text */
    opacity: 0.7;
}

/* Grouping for Phase Info Text */
.phase-info-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 2px;
}

.special-moon-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: #aaddff;
    /* Slightly brighter than accent for visibility */
    text-shadow: 0 0 5px rgba(136, 187, 255, 0.4);
    margin-top: 4px;
}

.special-moon-desc {
    font-size: 0.7rem;
    color: #ccc;
    font-style: italic;
    line-height: 1.3;
    max-width: 180px;
    /* Constrain width to prevent layout breaking */
    margin-top: 2px;
    margin-bottom: 4px;
    padding-left: 4px;
    border-left: 2px solid var(--accent);
}

/* Welcome Modal Specifics */
.welcome-content {
    width: 90vw;
    height: 85vh;
    max-width: 1200px;
    max-height: 850px;
    display: flex;
    flex-direction: column;
    padding: 40px;
}

.welcome-body {
    flex: 1;
    overflow-y: auto;
    padding: 10px 20px;
}

.welcome-section {
    margin-bottom: 32px;
    background: rgba(255, 255, 255, 0.02);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.2);
}

.welcome-section h3 {
    margin-top: 0;
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.welcome-section p {
    line-height: 1.5;
    color: #ccc;
    font-size: 1rem;
    margin: 0;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.control-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background: rgba(255, 255, 255, 0.03);
    padding: 32px 24px;
    border-radius: 20px;
    gap: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.control-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(136, 187, 255, 0.3);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.control-item .icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
    color: var(--accent);
    filter: drop-shadow(0 0 10px rgba(136, 187, 255, 0.2));
}

.control-item span {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.control-item strong {
    color: #fff;
}

.welcome-footer {
    display: flex;
    justify-content: center;
    margin-top: auto;
    padding-top: 20px;
}

#btn-welcome-ok {
    max-width: 200px;
    font-size: 1.1rem;
    padding: 12px 32px;
}

/* Dynamic Scale */
.view-scale {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    pointer-events: none;
    z-index: 10;
}

.scale-bar {
    height: 6px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-top: none;
    width: 100px;
    /* Dynamic */
    background: rgba(255, 255, 255, 0.1);
}

.scale-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 4px;
    text-shadow: 0 0 4px rgba(0, 0, 0, 0.8);
    font-family: monospace;
}