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

:root {
    color-scheme: dark;
    --page-bg: #000000;
    --surface: rgba(0, 0, 0, 0.42);
    --surface-strong: rgba(0, 0, 0, 0.72);
    --surface-hover: rgba(255, 255, 255, 0.14);
    --border: rgba(255, 255, 255, 0.22);
    --border-hover: rgba(255, 255, 255, 0.5);
    --text: #ffffff;
    --accent: #667eea;
    --success: #4caf50;
}

html,
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    height: 100vh;
    overflow: hidden;
    background: var(--page-bg);
    color: var(--text);
}

#container {
    position: relative;
    width: 100%;
    height: 100%;
}

#toggleUI {
    position: absolute;
    top: 20px;
    left: 50%;
    z-index: 1500;
    min-width: 76px;
    margin: 0;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.62);
}

#repoLink {
    position: absolute;
    left: 50%;
    bottom: 10px;
    z-index: 1500;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.72);
    font-size: 12px;
    text-decoration: none;
    text-shadow: 0 1px 3px #000;
}

#repoLink:hover {
    color: var(--text);
    text-decoration: underline;
}

body.ui-hidden #dropZone,
body.ui-hidden #controls,
body.ui-hidden #sidePanel,
body.ui-hidden #info,
body.ui-hidden #meshInfo,
body.ui-hidden #captureFrame,
body.ui-hidden #repoLink {
    display: none !important;
}

body.ui-hidden #toggleUI {
    opacity: 0.62;
}

body.ui-hidden #toggleUI:hover {
    opacity: 1;
}

#dropZone {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 480px;
    height: 240px;
    border: 2px dashed rgba(255, 255, 255, 0.72);
    border-radius: 15px;
    background: var(--surface);
    backdrop-filter: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
}

#dropZone:hover,
#dropZone.dragover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--success);
    transform: translate(-50%, -50%) scale(1.05);
}

#dropZone.hidden {
    display: none;
}

#dropText {
    color: var(--text);
    font-size: 22px;
    margin-bottom: 12px;
    text-align: center;
    font-weight: bold;
    text-shadow: 0 1px 4px #000, 0 0 10px rgba(0, 0, 0, 0.95);
}

#dropSubtext {
    color: var(--text);
    font-size: 14px;
    text-align: center;
    line-height: 1.7;
    text-shadow: 0 1px 4px #000, 0 0 10px rgba(0, 0, 0, 0.95);
}

#controls {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: none;
}

#sidePanel {
    position: absolute;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    display: none;
}

#sidePanel .control-panel {
    width: min(380px, calc(100vw - 40px));
    min-width: 0;
}

.control-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 15px;
    border-radius: 10px;
    color: var(--text);
    box-shadow: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
    min-width: 230px;
}

.control-group {
    margin-bottom: 15px;
}

.control-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
}

label.chk {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    cursor: pointer;
}

label.chk input {
    margin-right: 8px;
    cursor: pointer;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    flex: 1;
    min-width: 150px;
    accent-color: var(--accent);
}

.slider-value {
    min-width: 45px;
    text-align: right;
    font-size: 13px;
}

button,
select {
    background: rgba(0, 0, 0, 0.56);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 5px;
    font-size: 14px;
}

select {
    width: 100%;
    padding: 7px 9px;
}

button {
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 5px;
    margin-bottom: 5px;
}

button:hover {
    background: var(--surface-hover);
    border-color: var(--border-hover);
}

button:disabled {
    background: rgba(0, 0, 0, 0.24);
    border-color: rgba(255, 255, 255, 0.2);
    cursor: not-allowed;
    opacity: 0.5;
}

.control-help {
    max-width: 260px;
    margin-top: 3px;
    color: rgba(255, 255, 255, 0.72);
    font-size: 11px;
    line-height: 1.4;
}

.control-status {
    max-width: 260px;
    min-height: 0;
    margin-top: 5px;
    color: #b9c4ff;
    font-size: 12px;
    line-height: 1.4;
}

#adjustHorizontalGrid.active {
    border-color: var(--accent);
    background: rgba(102, 126, 234, 0.35);
}

#useHorizontalGrid {
    border-color: #ffad42;
    background: rgba(230, 118, 18, 0.9);
    color: #ffffff;
    font-weight: 700;
}

#useHorizontalGrid:hover {
    border-color: #ffd08a;
    background: rgba(255, 139, 31, 1);
}

.hidden-control {
    display: none;
}

#canvas.selecting-orbit-plane {
    cursor: crosshair;
}

input[type="checkbox"]:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.checkbox-with-help {
    display: flex;
    align-items: center;
    gap: 2px;
}

.checkbox-with-help label.chk {
    margin-bottom: 0;
}

.help-tip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    margin-left: 4px;
    border: 1px solid rgba(255, 255, 255, 0.55);
    border-radius: 50%;
    color: #ffffff;
    font-size: 11px;
    font-weight: 700;
    line-height: 1;
    cursor: help;
    vertical-align: middle;
}

.help-tip::after {
    content: attr(data-tooltip);
    position: absolute;
    z-index: 3000;
    right: -8px;
    bottom: calc(100% + 9px);
    width: min(300px, 70vw);
    padding: 9px 11px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 7px;
    background: rgba(18, 22, 34, 0.97);
    box-shadow: 0 5px 18px rgba(0, 0, 0, 0.38);
    color: #ffffff;
    font-size: 12px;
    font-weight: 400;
    line-height: 1.45;
    text-align: left;
    white-space: normal;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(3px);
    transition: opacity 0.12s ease, transform 0.12s ease, visibility 0.12s;
}

.help-tip:hover::after,
.help-tip:focus-visible::after {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dl-group {
    border-top: 1px solid rgba(255, 255, 255, 0.25);
    padding-top: 12px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
}

.dl-title {
    grid-column: 1 / -1;
    font-size: 13px;
    font-weight: bold;
    opacity: 0.9;
    margin-bottom: 2px;
}

.dl-group button {
    width: 100%;
    min-width: 0;
    min-height: 42px;
    margin: 0;
    padding: 7px 5px;
    font-size: 12px;
    line-height: 1.2;
    white-space: normal;
}

#loadingOverlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.34);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.loader {
    color: var(--text);
    text-align: center;
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 32px;
    text-shadow: 0 1px 4px #000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.28);
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.progress {
    width: 260px;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    overflow: hidden;
    margin: 15px auto 0;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.2s ease;
}

#canvas {
    display: block;
    width: 100%;
    height: 100%;
    background: transparent;
}

#captureFrame {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    height: 100%;
    aspect-ratio: 1 / 1;
    border: 2px dashed rgba(102, 126, 234, 0.5);
    pointer-events: none;
    z-index: 500;
    display: none;
}

#captureFrame.visible {
    display: block;
}

#fileInput {
    display: none;
}

#info {
    position: absolute;
    bottom: 20px;
    left: 20px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    box-shadow: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
    display: none;
    line-height: 1.8;
}

#meshInfo {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: none;
}

.info-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 15px;
    border-radius: 10px;
    color: var(--text);
    box-shadow: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
    font-size: 14px;
    min-width: 220px;
}

.info-panel div {
    margin-bottom: 8px;
}

.info-panel div:last-child {
    margin-bottom: 0;
}

.info-label {
    color: #ffffff;
    font-weight: bold;
    opacity: 0.9;
}