:root {
    --bg-color: #ffffff;
    --panel-bg: rgba(255, 255, 255, 0.95);
    --text-color: #333333;
    --border-color: #dddddd;
    --input-bg: #ffffff;
    --btn-bg: #f0f0f0;
    --btn-hover: #e0e0e0;
    --scrollbar-bg: #f0f0f0;
    --scrollbar-thumb: #cccccc;
    --scrollbar-hover: #aaaaaa;
    --hr-color: #cccccc;
    --sub-text: #888888;
    --accent-color: #44aaff;
}

[data-theme="dark"] {
    --bg-color: #111111;
    --panel-bg: rgba(25, 25, 25, 0.85);
    --text-color: #eeeeee;
    --border-color: #444444;
    --input-bg: #222222;
    --btn-bg: #333333;
    --btn-hover: #444444;
    --scrollbar-bg: #222222;
    --scrollbar-thumb: #555555;
    --scrollbar-hover: #777777;
    --hr-color: #555555;
    --sub-text: #aaaaaa;
}

html,
body {
    margin: 0;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
}

body {
    color: var(--text-color);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s;
}

#app {
    width: 100%;
    height: 100%;
}

#app canvas {
    display: block;
}

#ui,
#advanced-ui,
#loading {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    transition: background 0.3s, border-color 0.3s, color 0.3s;
}

#ui,
#advanced-ui {
    position: absolute;
    top: 12px;
    z-index: 10;
    border-radius: 8px;
    padding: 12px 14px;
}

#ui {
    left: 12px;
    min-width: 240px;
    max-width: 300px;
}

#advanced-ui {
    right: 12px;
    width: 304px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 20;
    transform: translate(-50%, -50%);
    padding: 14px 18px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-color);
}

#loading.is-hidden {
    display: none;
}

#loading.is-error {
    border-color: #d16a6a;
    color: #d16a6a;
}

.top-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.top-bar select {
    flex-grow: 1;
    margin-bottom: 0;
}

#theme-toggle {
    cursor: pointer;
    background: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0 10px;
    font-size: 16px;
    transition: background 0.2s, border-color 0.2s;
}

#theme-toggle:hover {
    background: var(--btn-hover);
}

select {
    width: 100%;
    padding: 5px 6px;
    border-radius: 4px;
    background: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    font-size: 13px;
    transition: background 0.3s, color 0.3s, border-color 0.3s;
}

hr {
    border: 0;
    border-top: 1px solid var(--hr-color);
    margin: 8px 0 10px;
    transition: border-color 0.3s;
}

.section-title {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--sub-text);
    margin: 0 0 8px 0;
    letter-spacing: 0.5px;
    font-weight: 700;
}

.legend-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.legend-list label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-color);
    user-select: none;
}

input[type="checkbox"] {
    margin: 0;
    accent-color: var(--accent-color);
}

.repo-credit,
.meta-summary,
.empty-state {
    font-size: 11px;
    color: var(--sub-text);
    line-height: 1.4;
}

.meta-summary {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
}

.meta-summary strong {
    color: var(--text-color);
    font-weight: 600;
}

.action-row,
.toggle-row,
.appearance-row {
    display: flex;
    gap: 6px;
}

.action-btn,
.panel-toggle {
    cursor: pointer;
    background: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.action-btn {
    flex: 1;
    padding: 6px 0;
}

.action-btn:hover,
.panel-toggle:hover {
    background: var(--btn-hover);
}

.action-btn.is-active {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

#adv-toggle {
    flex: 1 1 auto;
    width: 100%;
    text-align: center;
    padding: 7px 8px;
}

.toggle-row .panel-toggle {
    flex: 1 1 0;
    text-align: center;
    padding: 7px 8px;
}

.panel-toggle-secondary {
    padding: 7px 12px;
    white-space: nowrap;
}

#adv-content {
    display: none;
    overflow-y: auto;
    padding-right: 5px;
}

#layer-controls {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 0;
    font-size: 12px;
}

.control-label {
    color: var(--text-color);
}

.sub-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sub-controls input[type="color"] {
    width: 24px;
    height: 24px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    background: var(--input-bg);
}

.sub-controls input[type="range"] {
    width: 80px;
    cursor: pointer;
    accent-color: #888888;
}

.repo-credit {
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.credit-line {
    display: flex;
    gap: 4px;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.repo-credit a {
    color: var(--accent-color);
    text-decoration: none;
}

.repo-credit a:hover {
    text-decoration: underline;
}

#restore-ui {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 25;
    display: none;
    backdrop-filter: blur(8px);
}

body.ui-hidden #ui,
body.ui-hidden #advanced-ui {
    display: none !important;
}

body.ui-hidden .viewer-hint {
    display: none !important;
}

body.ui-hidden #restore-ui {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.viewer-hint {
    position: absolute;
    left: 50%;
    bottom: 18px;
    z-index: 15;
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: min(520px, calc(100vw - 24px));
    padding: 11px 14px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--panel-bg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(8px);
    transform: translateX(-50%);
    cursor: pointer;
    user-select: none;
    transition: opacity 0.2s ease, transform 0.2s ease, background 0.3s, border-color 0.3s;
}

.viewer-hint.is-hidden {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 12px);
}

.viewer-hint-icon {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 999px;
    background: var(--btn-bg);
    color: var(--accent-color);
}

.viewer-hint-icon svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.viewer-hint-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.viewer-hint-copy strong {
    font-size: 12px;
    line-height: 1.2;
}

.viewer-hint-copy span {
    font-size: 11px;
    color: var(--sub-text);
    line-height: 1.3;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-hover);
}

@media (max-width: 980px) {
    #ui,
    #advanced-ui {
        left: 12px;
        right: 12px;
        width: auto;
        max-width: none;
    }

    #ui {
        top: 12px;
        min-width: 0;
    }

    #advanced-ui {
        top: auto;
        bottom: 12px;
        max-height: 42vh;
    }

    #restore-ui {
        top: auto;
        right: 12px;
        bottom: 12px;
    }

    .viewer-hint {
        bottom: 12px;
        border-radius: 16px;
        padding: 10px 12px;
    }
}