:root {
    --sidebar-w: 280px;
    --bg-base: #f7f7f8;
    --sidebar-bg: rgba(255, 255, 255, 0.85);
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent-color: #007aff;
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.6);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.08), inset 0 0 0 1px rgba(255, 255, 255, 0.5);
    --element-border: rgba(128, 128, 128, 0.15);
    --card-border: rgba(128, 128, 128, 0.2);
    --grid-line: rgba(0, 0, 0, 0.08);
    
    --easing-spring: cubic-bezier(0.25, 1.2, 0.5, 1);
    --easing-smooth: cubic-bezier(0.25, 1, 0.5, 1);
}

body.dark-mode {
    --bg-base: #050505;
    --sidebar-bg: rgba(18, 18, 18, 0.85);
    --text-primary: #ffffff;
    --text-secondary: #86868b;
    --glass-bg: rgba(30, 30, 30, 0.65);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 10px 40px -10px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(255,255,255,0.08);
    --element-border: rgba(255, 255, 255, 0.1);
    --card-border: rgba(200, 200, 200, 0.15);
    --grid-line: rgba(255, 255, 255, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-font-smoothing: antialiased; }
body {
    display: flex; height: 100vh; width: 100vw; overflow: hidden;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
    background: var(--bg-base); color: var(--text-primary);
    transition: background 0.3s var(--easing-smooth);
}

.custom-scrollbar::-webkit-scrollbar { width: 4px; height: 4px; }
.custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
.custom-scrollbar::-webkit-scrollbar-thumb { background: rgba(128,128,128,0.25); border-radius: 10px; }
.custom-scrollbar::-webkit-scrollbar-thumb:hover { background: rgba(128,128,128,0.4); }

/* glass-panel 的 backdrop-filter 仅在少量关键层应用，避免叠加多层模糊 */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.fade-trans { transition: opacity 0.4s ease, transform 0.4s ease; }
.fade-trans.hidden { opacity: 0; pointer-events: none; transform: scale(0.98); }

/* --- 侧边栏 --- */
.sidebar {
    width: var(--sidebar-w); height: 100%; display: flex; flex-direction: column;
    z-index: 200; border-right: 1px solid var(--element-border);
    background: var(--sidebar-bg);
    /* 侧边栏自成 stacking context，防止其内部 backdrop-filter 污染主区域层叠 */
    will-change: transform;
    contain: layout style;
}
.sidebar-header { padding: 30px 20px 24px; display: flex; align-items: center; border-bottom: 1px solid var(--element-border); }
.sidebar-logo { width: 120px; height: auto; display: block; }

.sidebar-search { padding: 20px 16px; border-bottom: 1px solid var(--element-border); background: rgba(128,128,128,0.02); }
.search-input-wrapper {
    display: flex; align-items: center; gap: 8px;
    background: rgba(128,128,128,0.06); border: 1px solid var(--element-border);
    border-radius: 12px; padding: 10px 14px; transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input-wrapper:focus-within { border-color: var(--accent-color); background: rgba(128,128,128,0.1); box-shadow: 0 0 0 3px rgba(0,122,255,0.1); }
.search-input-wrapper input { border: none; background: transparent; outline: none; color: var(--text-primary); font-size: 13px; width: 100%; font-weight: 500; }
.search-input-wrapper input::placeholder { color: var(--text-secondary); opacity: 0.7; }
.search-input-wrapper svg { color: var(--text-secondary); flex-shrink: 0; }

.icon-btn {
    width: 34px; height: 34px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-primary); background: transparent; border: 1px solid transparent;
    cursor: pointer; transition: background 0.2s, border-color 0.2s;
}
/* glass-panel 已在 .glass-panel 定义，此处无需重复写 backdrop-filter */
.icon-btn.glass-panel { background: var(--glass-bg); }
.icon-btn:hover { background: rgba(128,128,128,0.1); border-color: var(--glass-border); }
.icon-btn.mini { width: 26px; height: 26px; border-radius: 8px; }
.icon-btn.large { width: 48px; height: 48px; border-radius: 16px; box-shadow: var(--glass-shadow); border: 1px solid var(--glass-border); }
.ui-top-left-nav .icon-btn.large:hover { background: rgba(128,128,128,0.1); }
.icon-btn.large:active { transform: scale(0.95); box-shadow: none; }

.sidebar-scroll-area { flex: 1; overflow-y: auto; padding: 24px 16px; }
.font-category-group { border: 1px solid var(--element-border); border-radius: 20px; padding: 16px 8px 10px; margin-bottom: 20px; background: rgba(128,128,128,0.02); display: flex; flex-direction: column; }
.group-main-title { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700; color: var(--text-primary); margin-bottom: 16px; padding: 0 6px; }
.category-sub-header { font-size: 11px; font-weight: 700; color: var(--text-secondary); margin: 0 0 8px 10px; letter-spacing: 0.5px; }

.category-list { overflow-y: auto; padding: 0 6px; }

.sidebar-font-item {
    display: flex; align-items: center; justify-content: space-between; gap: 8px;
    padding: 12px 10px; border-radius: 12px; cursor: pointer;
    font-size: 14px; font-weight: 500; color: var(--text-secondary);
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    border: 1px solid transparent; border-bottom: 1px solid var(--element-border);
}
.sidebar-font-item:last-child { border-bottom-color: transparent; }
.sidebar-font-item:hover { background: rgba(128,128,128,0.05); color: var(--text-primary); border-bottom-color: transparent; }
.sidebar-font-item.active { background: rgba(128,128,128,0.08); color: var(--text-primary); border-color: rgba(128,128,128,0.2); font-weight: 600; }
body.dark-mode .sidebar-font-item.active { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.15); }

.font-item-content { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; }
.font-name-span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.font-type-tag { font-size: 10px; font-weight: 600; padding: 2px 6px; border-radius: 6px; background: rgba(128,128,128,0.1); color: var(--text-secondary); white-space: nowrap; flex-shrink: 0; margin-left: auto; }
.sidebar-font-item.active .font-type-tag { background: rgba(128,128,128,0.2); color: var(--text-primary); }
body.view-mode-list .sidebar-font-item .font-type-tag { display: none; }

.checkbox-ui {
    width: 18px; height: 18px; border: 2px solid rgba(128,128,128,0.3); border-radius: 5px;
    display: none; align-items: center; justify-content: center; transition: background 0.2s, border-color 0.2s; flex-shrink: 0;
}
.checkbox-ui svg { opacity: 0; transform: scale(0.8); transition: opacity 0.2s, transform 0.2s var(--easing-spring); stroke: #fff; }
body.view-mode-list .checkbox-ui { display: flex; }
body.view-mode-list .sidebar-font-item.active .checkbox-ui { background: #555; border-color: #555; }
body.dark-mode.view-mode-list .sidebar-font-item.active .checkbox-ui { background: #888; border-color: #888; }
body.view-mode-list .sidebar-font-item.active .checkbox-ui svg { opacity: 1; transform: scale(1); }

.sidebar-footer { padding: 16px 20px; border-top: 1px solid var(--element-border); position: relative; }

.footer-btn-group {
    display: flex; align-items: center; justify-content: space-between;
    background: rgba(128,128,128,0.04); border: 1px solid var(--element-border);
    border-radius: 14px; padding: 4px; gap: 4px;
}

.footer-tab-btn {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 0; border-radius: 10px; border: none; background: transparent;
    color: var(--text-primary); font-size: 13px; font-weight: 600;
    cursor: pointer; transition: background 0.2s;
}
.footer-tab-btn:hover { background: rgba(128,128,128,0.08); }

.footer-divider-v { width: 1px; height: 16px; background: var(--element-border); flex-shrink: 0; }

.settings-wrapper { flex: 1; display: flex; position: relative; }
.settings-wrapper .footer-tab-btn { width: 100%; }

.settings-popover {
    position: absolute; bottom: -4px; left: calc(100% + 36px); width: 240px;
    border-radius: 20px; padding: 20px; transform-origin: bottom left;
    transition: opacity 0.3s var(--easing-smooth), transform 0.3s var(--easing-smooth);
    z-index: 300; box-shadow: 0 16px 40px rgba(0,0,0,0.08);
    background: rgba(255,255,255,0.95);
    /* 设置面板独立的 backdrop-filter，不影响主区域 */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}
body.dark-mode .settings-popover { box-shadow: 0 16px 40px rgba(0,0,0,0.4); background: rgba(30,30,30,0.95); }
.settings-popover.hidden { opacity: 0; transform: scale(0.9) translateX(-10px); pointer-events: none; }

.setting-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; font-size: 13px; font-weight: 500; }
.setting-label { font-size: 11px; color: var(--text-secondary); margin-bottom: 10px; font-weight: 700; text-transform: uppercase; }
.ui-divider { height: 1px; background: var(--glass-border); margin: 16px 0; opacity: 0.5; }

/* --- 侧边栏底部备案信息 --- */
.global-record-info {
    margin-top: 16px; display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 6px;
    font-size: 12px; color: var(--text-secondary);
    opacity: 0.6; transition: opacity 0.3s;
}
.global-record-info:hover { opacity: 1; }
.global-record-info .record-line { display: flex; align-items: center; gap: 4px; }
.global-record-info .record-icon { width: 14px; height: 14px; object-fit: contain; }
.global-record-info a { color: inherit; text-decoration: none; transition: color 0.2s; white-space: nowrap; }
.global-record-info a:hover { color: var(--text-primary); }

/* --- 模态弹窗 (关于) --- */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.25);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    z-index: 1000; display: flex; align-items: center; justify-content: center;
    transition: opacity 0.3s var(--easing-smooth);
}
.modal-overlay.hidden { opacity: 0; pointer-events: none; }
.modal-content {
    width: 520px; max-width: 90vw; padding: 40px; border-radius: 30px; position: relative;
    transition: transform 0.3s var(--easing-spring);
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(32px) saturate(180%);
    -webkit-backdrop-filter: blur(32px) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}
body.dark-mode .modal-content { background: rgba(24,24,27,0.96); box-shadow: 0 20px 60px rgba(0,0,0,0.5); }
.modal-overlay.hidden .modal-content { transform: scale(0.95) translateY(10px); }

.modal-close-btn { position: absolute; top: 20px; right: 20px; }
.about-header { text-align: center; margin-bottom: 32px; }
.about-logo { height: 32px; width: auto; margin-bottom: 12px; }
.about-subtitle { font-size: 14px; font-weight: 600; color: var(--text-secondary); letter-spacing: 2px; }
.about-body { display: flex; flex-direction: column; gap: 24px; }
.about-section { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.about-section h4 { display: flex; align-items: center; gap: 8px; color: var(--text-primary); font-size: 15px; margin-bottom: 10px; }
.about-section code { background: rgba(128,128,128,0.1); padding: 2px 6px; border-radius: 4px; font-family: monospace; }
.about-footer { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--element-border); font-size: 11px; text-align: center; color: var(--text-secondary); opacity: 0.8; }
.footer-link { color: var(--text-secondary); text-decoration: none; transition: color 0.2s; }
.footer-link:hover { color: var(--text-primary); text-decoration: underline; }

/* --- 工作区与背景/图案 --- */
.main-workspace { flex: 1; position: relative; overflow: hidden; }

.background-system { position: absolute; inset: 0; pointer-events: none; }
.bg-global { z-index: 0; }
.bg-layer { position: absolute; inset: 0; opacity: 0; transition: opacity 0.6s ease; }
body.bg-mode-plain .layer-plain { opacity: 1; }
body.bg-mode-fluid .layer-fluid { opacity: 1; }
body.bg-mode-image .layer-image { opacity: 1; }

/* 
   流体 blob：仅在 bg-mode-fluid 时激活 GPU 层（visibility:hidden 时浏览器不会合成该层）
   animation-play-state 控制动画，避免隐藏层仍消耗 GPU
*/
@keyframes floatAnim {
    0%   { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5%, 5%) scale(1.1); }
}
.fluid-blob {
    position: absolute; border-radius: 50%;
    filter: blur(80px); opacity: 0.5;
    animation-play-state: paused; /* 默认暂停，只有激活时才运行 */
    will-change: transform;
}
body.bg-mode-fluid .fluid-blob { animation-play-state: running; }

.blob-a { background: #c4f5fc; width: 50vw; height: 50vw; top: -10%; left: -10%; animation: floatAnim 15s infinite alternate ease-in-out; }
.blob-b { background: #e8dff5; width: 45vw; height: 45vw; bottom: -10%; right: -10%; animation: floatAnim 18s infinite alternate-reverse ease-in-out; }
.blob-c { background: #fff9c4; width: 30vw; height: 30vw; top: 30%; left: 30%; animation: floatAnim 20s infinite alternate ease-in-out; }

body.dark-mode .fluid-blob { opacity: 0.25; filter: blur(100px); }
body.dark-mode .blob-a { background: #0044ff; }
body.dark-mode .blob-b { background: #aa00ff; }
body.dark-mode .blob-c { background: #ffaa00; opacity: 0.2; }

.layer-image { background-position: center; background-size: cover; }

/* 画布图案层 */
.layer-pattern {
    position: absolute; inset: 0; pointer-events: none;
    opacity: 0; transition: opacity 0.6s ease;
    mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
    mix-blend-mode: multiply;
}
body.dark-mode .layer-pattern { mix-blend-mode: screen; }

.pattern-grid { background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 40px 40px; }
.pattern-dots { background-image: radial-gradient(circle at 1px 1px, var(--grid-line) 1.5px, transparent 1.5px); background-size: 40px 40px; }

body.pattern-mode-grid .pattern-grid { opacity: 1; z-index: 1; }
body.pattern-mode-dots .pattern-dots { opacity: 1; z-index: 1; }

/* canvas-viewport 不设 backdrop-filter，避免在最大层叠层触发全页面重绘 */
.canvas-viewport { position: absolute; inset: 0; z-index: 10; cursor: default; }
.canvas-transform-layer { position: absolute; transform-origin: 0 0; will-change: transform; }

.preview-char-node {
    position: absolute; transform: translate(-50%, -50%);
    font-size: 300px; line-height: 1.1; white-space: nowrap; outline: none;
    transition: color 0.3s, font-variation-settings 0.1s ease-out;
    will-change: font-variation-settings;
}
.preview-char-node.is-auto-playing { transition: color 0.3s; }

.list-preview-text {
    font-size: 80px; outline: none; line-height: 1.2; min-height: 1.2em;
    text-align: left; white-space: pre;
    overflow-x: auto; overflow-y: hidden; padding-bottom: 10px;
    transition: color 0.3s, font-variation-settings 0.1s ease-out;
    will-change: font-variation-settings;
}
.list-preview-text::-webkit-scrollbar { height: 4px; }
.list-preview-text::-webkit-scrollbar-thumb { background: rgba(128,128,128,0.2); border-radius: 4px; }

/* 文字描边与反色 */
.preview-char-node.stroke-mode, .list-preview-text.stroke-mode { color: transparent !important; -webkit-text-stroke: 2px var(--text-primary); background: none !important; filter: none !important; }
.list-preview-text.stroke-mode { -webkit-text-stroke: 1px var(--text-primary); }
.preview-char-node.invert-mode, .list-preview-text.invert-mode { color: var(--bg-base) !important; }
.preview-char-node.stroke-mode.invert-mode { -webkit-text-stroke: 2px var(--bg-base) !important; }
.list-preview-text.stroke-mode.invert-mode { -webkit-text-stroke: 1px var(--bg-base) !important; }

.list-view-container {
    position: absolute; inset: 0; z-index: 20;
    overflow-y: auto; overflow-x: hidden;
    padding: 24px 24px 140px;
    display: flex; flex-direction: column; gap: 20px;
}

.list-font-card {
    border: 1px solid var(--card-border); border-radius: 24px; padding: 24px 30px;
    display: flex; flex-direction: column; gap: 20px;
    background: rgba(255,255,255,0.95);
    /* 卡片 backdrop-filter 降低模糊半径（多卡片并存时 GPU 开销大） */
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    box-shadow: 0 4px 24px rgba(0,0,0,0.03);
    /* contain: layout 让浏览器在布局计算时跳过对外部的影响 */
    contain: layout;
}
body.dark-mode .list-font-card { background: rgba(24,24,27,0.95); }

.list-card-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--card-border); padding-bottom: 24px; }
.list-font-name-wrap { display: flex; align-items: center; gap: 12px; }
.list-font-name { font-size: 22px; font-weight: 700; letter-spacing: 0.5px; }
.list-font-tag { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 8px; background: rgba(128,128,128,0.1); color: var(--text-secondary); }

.list-card-actions { display: flex; align-items: center; gap: 40px; }
.list-axes-wrap { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.list-axis-item { display: flex; align-items: center; gap: 12px; }
.list-axis-label { font-size: 11px; font-weight: 700; color: var(--text-secondary); width: 40px; }
.list-axis-item input[type=range] { width: 100px; }

.ui-zoom-badge { position: absolute; top: 30px; right: 30px; z-index: 150; padding: 10px 20px; border-radius: 20px; font-size: 13px; font-weight: 700; font-family: "Inter", monospace; }
.ui-floating-tools { position: absolute; right: 30px; bottom: 30px; z-index: 150; }

.view-switch-pill {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 20px 10px 14px; border-radius: 24px;
    border: 1px solid var(--glass-border); color: var(--text-primary);
    cursor: pointer; transition: background 0.3s var(--easing-spring), transform 0.3s var(--easing-spring), box-shadow 0.3s;
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: var(--glass-shadow);
}
.view-switch-pill:hover { background: rgba(128,128,128,0.1); transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
.view-switch-pill:active { transform: scale(0.96); box-shadow: none; }
.view-switch-pill .pill-text { font-size: 13px; font-weight: 600; white-space: nowrap; }

.ui-top-left-nav { position: absolute; top: 30px; left: 30px; z-index: 150; border-radius: 16px; transition: opacity 0.4s var(--easing-smooth), transform 0.4s var(--easing-smooth); }
body.view-mode-list .ui-top-left-nav { opacity: 0; pointer-events: none; transform: scale(0.95); }
.ui-top-left-nav::after { content: ''; position: absolute; top: 100%; left: 0; right: 0; height: 15px; }

.nav-popover {
    position: absolute; top: calc(100% + 10px); left: 0; width: 150px;
    border-radius: 16px; padding: 8px; opacity: 0; pointer-events: none;
    transform: translateY(-10px); transition: opacity 0.3s var(--easing-spring), transform 0.3s var(--easing-spring);
}
.ui-top-left-nav:hover .nav-popover { opacity: 1; pointer-events: auto; transform: translateY(0); }

.nav-link {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 14px; color: var(--text-primary);
    text-decoration: none; font-size: 13px; font-weight: 500;
    border-radius: 10px; transition: background 0.2s;
}
.nav-link::before {
    content: ''; display: block; width: 5px; height: 5px; border-radius: 50%;
    background: rgba(128,128,128,0.3); transition: background 0.2s var(--easing-spring), transform 0.2s var(--easing-spring);
}
.nav-link:hover { background: rgba(128,128,128,0.08); }
.nav-link:hover::before { background: var(--text-primary); transform: scale(1.3); }

/* --- 底部控制岛 --- */
.control-island {
    position: absolute; bottom: 35px; left: 50%; transform: translateX(-50%);
    height: 100px; padding: 0 40px; border-radius: 30px;
    display: flex; align-items: center; justify-content: center;
    width: fit-content; min-width: min(300px, 90vw); max-width: 90vw;
    z-index: 140; transition: all 0.4s var(--easing-smooth);
}

.control-group {
    display: flex; align-items: center; justify-content: center;
    width: fit-content; height: 100%; transition: opacity 0.3s;
}
.control-group.hidden { display: none; }

#canvas-controls { width: auto; }
.axis-scroll-container {
    display: flex; gap: 40px; flex: 1; overflow-x: auto; overflow-y: visible;
    align-items: center; justify-content: center; height: 100%;
}
.axis-scroll-container::-webkit-scrollbar { display: none; }
.island-actions { margin-left: 20px; }

.download-btn {
    width: 36px; height: 36px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: rgba(128,128,128,0.1); color: var(--text-secondary);
    transition: background 0.3s, color 0.3s, transform 0.3s;
}
.download-btn.hidden { display: none; }
.download-btn:hover { background: rgba(128,128,128,0.2); color: var(--text-primary); transform: translateY(-2px); }

.control-row-inline { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.control-row-inline.fluid { flex: 1 1 250px; }
.control-label { font-size: 13px; font-weight: 600; color: var(--text-secondary); white-space: nowrap; }
.control-val { font-size: 13px; font-weight: 700; color: var(--text-primary); min-width: 48px; text-align: right; }

.ui-input-box {
    width: 100%; min-width: 150px;
    background: rgba(128,128,128,0.08); border: 1px solid var(--element-border);
    border-radius: 10px; padding: 8px 14px; font-size: 14px; color: var(--text-primary);
    outline: none; font-family: inherit; font-weight: 500; transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}
.ui-input-box:focus { border-color: var(--accent-color); background: rgba(128,128,128,0.12); box-shadow: 0 0 0 3px rgba(0,122,255,0.1); }
.ui-divider-vertical { width: 1px; height: 30px; background: var(--glass-border); opacity: 0.8; margin: 0 24px; flex-shrink: 0; }

input[type=range] {
    -webkit-appearance: none;
    width: calc(100% - 16px);
    background: transparent;
    height: 28px;
    outline: none;
    margin: 0 8px;
}
input[type=range]::-webkit-slider-runnable-track { height: 4px; background: rgba(128,128,128,0.2); border-radius: 2px; }
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none; height: 18px; width: 18px; border-radius: 50%;
    background: var(--text-primary); margin-top: -7px; box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: transform 0.2s var(--easing-spring); cursor: grab;
}
input[type=range]:active::-webkit-slider-thumb { transform: scale(1.3); cursor: grabbing; }

.axis-group { min-width: 140px; display: flex; flex-direction: column; gap: 8px; flex: 1; max-width: 200px; }
.axis-header { display: flex; justify-content: space-between; align-items: center; }
.axis-label { font-size: 10px; color: var(--text-secondary); font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 4px; }
.play-btn { background: none; border: none; cursor: pointer; color: var(--text-secondary); border-radius: 4px; padding: 2px; transition: background 0.2s, color 0.2s; }
.play-btn:hover { background: rgba(128,128,128,0.1); color: var(--text-primary); }
.play-btn.playing { color: var(--accent-color); }

.ui-switch { width: 40px; height: 22px; background: rgba(128,128,128,0.2); border-radius: 11px; position: relative; cursor: pointer; transition: background 0.3s; }
.ui-switch-knob { width: 18px; height: 18px; background: #fff; border-radius: 50%; position: absolute; top: 2px; left: 2px; transition: transform 0.3s var(--easing-spring); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
.ui-switch.active { background: var(--accent-color); }
.ui-switch.active .ui-switch-knob { transform: translateX(18px); }

.ui-segmented-control { position: relative; display: flex; background: rgba(118,118,128,0.12); padding: 2px; border-radius: 10px; height: 32px; }
.sc-indicator { position: absolute; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: width 0.3s var(--easing-spring), transform 0.3s var(--easing-spring); z-index: 1; height: calc(100% - 4px); }
body.dark-mode .sc-indicator { background: #636366; }
.sc-btn { flex: 1; border: none; background: transparent; font-size: 12px; font-weight: 500; cursor: pointer; z-index: 2; color: var(--text-secondary); }
.sc-btn.active { color: var(--text-primary); font-weight: 700; }