/* ============================================================
   Tina Ma — Portfolio
   机制层：动效 / 布局机制 / Mock UI
   规范层（tokens / 组件 / 工具类）见 design-system.css，
   本文件不再定义颜色、字号、间距的硬编码值。
   ============================================================ */

html { background: var(--bg-primary); }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }

body { overflow-x: hidden; }

/* ---------- 版心（.wrap 为 .container 的兼容别名） ---------- */
.wrap {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ---------- site header ---------- */
.site-header {
  background: linear-gradient(to bottom, rgba(10,10,11,0.88) 0%, rgba(10,10,11,0.55) 60%, rgba(10,10,11,0) 100%);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* ---------- reading progress (detail pages) ---------- */
.read-progress {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0;
  background: var(--accent-bright);
  z-index: 60;
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ---------- back to top (detail pages) ---------- */
.back-top {
  position: fixed; right: var(--space-md); bottom: var(--space-md); z-index: 60;
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: var(--radius-full);
  background: rgba(10,10,11,0.7);
  backdrop-filter: blur(8px);
  color: var(--text-primary);
  opacity: 0; pointer-events: none;
  transform: translateY(12px);
  transition: opacity .4s ease, transform .4s var(--ease-smooth), border-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
  cursor: pointer;
}
.back-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top:hover { border-color: var(--accent-bright); color: var(--accent-bright); }

/* ---------- page transition (MPA fade) ---------- */
body { opacity: 0; transition: opacity 0.4s ease; }
body.is-loaded { opacity: 1; }
body.is-leaving { opacity: 0; }

/* ---------- preloader（仅首页，揭幕后文字入场） ---------- */
.preloader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--bg-primary);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-md);
  transition: transform 0.9s var(--ease-smooth);
}
.preloader.is-done { transform: translateY(-100%); pointer-events: none; }
.preloader .pre-num {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--font-size-hero);
  line-height: 1;
  color: var(--text-primary);
}
/* 揭幕前暂停 mask-line 入场动画 */
body:not(.is-ready) .mask-line > span { animation-play-state: paused; }

/* ---------- hero image trail ---------- */
.trail-layer {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}
/* 拖尾图片：transform/opacity 由 JS 逐帧驱动（新图微放大，旧图持续缩小退出），直角贴齐参考风格 */
.trail-img {
  position: absolute;
  width: clamp(96px, 11vw, 180px);
  border-radius: 0;
  box-shadow: var(--shadow-md);
  transform: translate(-50%, -50%) scale(0.7);
  opacity: 0;
  will-change: transform, opacity;
  pointer-events: none;
}

/* ---------- outline row 悬停浮出封面预览 ---------- */
.row-preview {
  position: fixed; top: 0; left: 0; z-index: 45;
  width: clamp(240px, 22vw, 340px);
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  pointer-events: none;
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 0.35s ease, transform 0.45s var(--ease-smooth);
}
.row-preview.is-visible { opacity: 1; transform: scale(1); }
/* 预览内的 cover 不被任何 hover 缩放波及 */
.row-preview .cover { transform: none; }

/* ---------- works carousel tabs ---------- */
.works-tabs { display: flex; flex-wrap: wrap; gap: var(--space-sm) var(--space-lg); }
.works-tab {
  font-family: var(--font-display);
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--text-secondary);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}
.works-tab:hover { color: var(--text-primary); }
.works-tab.is-active { color: var(--accent-bright); border-color: var(--accent-bright); }

/* ---------- 筛选显隐（works.html） ---------- */
.is-hidden { display: none !important; }

/* ---------- 浅色主题适配 ---------- */
[data-theme="light"] .grain::before { opacity: 0.04; }

/* ---------- custom cursor ---------- */
.cursor-dot, .cursor-ring {
  position: fixed; top: 0; left: 0;
  pointer-events: none; z-index: 9999;
  border-radius: var(--radius-full);
  transform: translate(-50%, -50%);
}
.cursor-dot { width: 6px; height: 6px; background: var(--accent-bright); }
.cursor-ring {
  width: 36px; height: 36px;
  border: 1px solid var(--cursor-ring);
  transition: width var(--duration-fast) var(--ease-out), height var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}
.cursor-ring.is-hover {
  width: 72px; height: 72px;
  border-color: var(--accent-bright);
  background: var(--accent-tint);
}
@media (hover: none), (max-width: 768px) {
  .cursor-dot, .cursor-ring { display: none; }
}

/* ---------- reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(48px);
  transition: opacity 1s var(--ease-smooth), transform 1s var(--ease-smooth);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- immersive scroll：hero 堆叠 + 模块离场渐隐 ---------- */
/* 方案 B：hero 钉在视口顶部，后续模块（.stack-cover，不透明底）滑上来盖住它 */
.stack-group { position: relative; }
.hero-stack {
  position: sticky;
  top: 0;
  z-index: 0;
  transform-origin: center 60%;
  will-change: transform, opacity;
}
.stack-cover {
  position: relative;
  z-index: 1;
  background: var(--bg-primary);   /* 不透明才能盖住 hero */
}
/* 方案 A：模块滚出视口时渐隐 + 轻微缩小，滚回时恢复 */
[data-immersive] {
  transition:
    opacity var(--duration-med) var(--ease-out),
    transform var(--duration-med) var(--ease-out);
}
[data-immersive].is-leaving {
  opacity: 0.1;
  transform: scale(0.97) translateY(-1rem);
}

/* line-mask entrance */
.mask-line { display: block; overflow: visible; }
.mask-line > span {
  display: block;
  transform: translateY(110%);
  animation: riseUp 1.2s var(--ease-smooth) forwards;
  animation-delay: var(--d, 0s);
  padding-bottom: 0.1em;
}
@keyframes riseUp { to { transform: translateY(0); } }

/* ---------- marquee ---------- */
.marquee { overflow: hidden; white-space: nowrap; }
.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 56s linear infinite;
  will-change: transform;
}
/* 每个重复分组不压缩、按内容定宽，保证位移 -50% 恰好跨过整数个分组 */
.marquee-track > span { flex: 0 0 auto; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- work cards (featured, large) ---------- */
.work-card .work-img-wrap {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: box-shadow var(--duration-med) var(--ease-smooth), border-color var(--duration-med) var(--ease-smooth), transform var(--duration-med) var(--ease-smooth);
  will-change: transform;
}
.work-card:hover .work-img-wrap {
  border-color: var(--accent-soft);
  transform: scale(1.012);
}
.work-card img {
  transition: transform var(--duration-slow) var(--ease-smooth), filter var(--duration-slow) ease;
  filter: grayscale(0) contrast(1.02);
  will-change: transform;
}
.work-card:hover img { transform: scale(1.06); filter: grayscale(0%) contrast(1.05); }
.work-card .work-arrow {
  opacity: 0; transform: translateX(-12px);
  transition: opacity .5s ease, transform .5s var(--ease-smooth);
}
.work-card:hover .work-arrow { opacity: 1; transform: translateX(0); }
.work-card .work-title { transition: color .4s ease; }
.work-card:hover .work-title { color: var(--accent-bright); }

/* ---------- works carousel (Selected Works 横滑轮播) ---------- */
/* 全宽轨道：首卡与 .wrap 版心对齐，右侧露出下一张 */
.works-track {
  display: flex;
  gap: var(--space-md);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  padding-inline: max(var(--container-pad), calc((100vw - var(--container-max)) / 2 + var(--container-pad)));
  padding-bottom: var(--space-md);
  cursor: grab;
}
.works-track::-webkit-scrollbar { display: none; }
.works-track.is-dragging { scroll-snap-type: none; cursor: grabbing; user-select: none; }
.works-track img { -webkit-user-drag: none; }

.works-slide {
  flex: 0 0 84%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
@media (min-width: 768px) {
  .works-track { gap: var(--space-lg); }
  .works-slide { flex-basis: min(62%, 780px); }
}

.works-arrow {
  width: 42px; height: 42px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  transition:
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    opacity var(--duration-fast) ease;
}
.works-arrow:hover { border-color: var(--accent-bright); color: var(--accent-bright); background: var(--accent-tint); }
.works-arrow:disabled { opacity: 0.25; pointer-events: none; }

.works-meta {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-md);
  padding-inline: max(var(--container-pad), calc((100vw - var(--container-max)) / 2 + var(--container-pad)));
}
.works-progress {
  flex: 1;
  height: 2px;
  background: var(--line);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.works-progress > span {
  display: block;
  height: 100%;
  background: var(--accent-bright);
  border-radius: var(--radius-full);
  transition: width var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

/* ---------- mini cards ---------- */
.mini-card {
  display: block;
  border-top: none;
  transition: background .5s ease;
}
.mini-card:hover { background: var(--surface-hover); }
.mini-card .mini-img-wrap {
  overflow: hidden;
  border: none;
  transition: box-shadow var(--duration-med) var(--ease-smooth), border-color var(--duration-med) var(--ease-smooth), transform var(--duration-med) var(--ease-smooth);
}
.mini-card:hover .mini-img-wrap {
  border-color: transparent;
  transform: scale(1.015);
}
.mini-card img {
  transition: transform 1s var(--ease-smooth), filter 1s ease;
  filter: grayscale(40%);
}
.mini-card:hover img { transform: scale(1.05); filter: grayscale(0%); }
.mini-card .mini-title { transition: color .4s ease, transform .5s var(--ease-smooth); }
.mini-card:hover .mini-title { color: var(--accent-bright); transform: translateX(6px); }
.mini-card .mini-index { transition: color .4s ease; }
.mini-card:hover .mini-index { color: var(--accent-bright); }
.mini-card:hover .circle-btn { transform: scale(1); opacity: 1; }

/* ---------- links ---------- */
.u-link { position: relative; transition: color .3s var(--ease-out); }
.u-link::after {
  content: ''; position: absolute; left: 0; bottom: -3px;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform .45s var(--ease-smooth);
}
.u-link:hover::after { transform: scaleX(1); transform-origin: left; }
.u-link.is-active { color: var(--accent-bright); }
.u-link.is-active::after { transform: scaleX(1); transform-origin: left; background: var(--accent-bright); }

/* ---------- scroll indicator ---------- */
.scroll-line { width: 1px; height: 64px; background: var(--line); position: relative; overflow: hidden; }
.scroll-line::after {
  content: ''; position: absolute; left: 0; top: -100%;
  width: 100%; height: 100%;
  background: var(--accent-bright);
  animation: scrollDrop 2s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}
@keyframes scrollDrop {
  0% { top: -100%; } 50% { top: 0; } 100% { top: 100%; }
}

/* ---------- timeline (experience) ---------- */
.timeline-item {
  position: relative;
  display: block;
  border-top: 1px solid var(--line);
  transition: background .5s ease;
}
.timeline-item:hover { background: var(--surface-hover); }
.timeline-item .tl-dot {
  width: 9px; height: 9px; border-radius: var(--radius-full);
  background: var(--text-secondary);
  transition: background .4s ease, transform .4s ease;
}
.timeline-item:hover .tl-dot { background: var(--accent-bright); transform: scale(1.4); }
.timeline-item .tl-role { transition: color .4s ease; }
.timeline-item:hover .tl-role { color: var(--accent-bright); }
.timeline-item .tl-arrow {
  opacity: 0; transform: translateX(-10px);
  transition: opacity .4s ease, transform .4s var(--ease-smooth);
}
.timeline-item:hover .tl-arrow { opacity: 1; transform: translateX(0); }

/* ---------- journey 章节（首页 Experience：中央竖线 + 节点 + 左右交替，复刻参考站 About） ---------- */
.journey { position: relative; }
.journey-item { position: relative; display: block; }
.journey-item .tl-role { transition: color .4s ease; }
/* journey 章节不可点击，不做 hover 变色 */
.journey-node {
  display: none;
  position: absolute; top: var(--space-xl); left: 50%;
  width: 9px; height: 9px; border-radius: var(--radius-full);
  background: var(--bg-primary); border: 1px solid var(--text-secondary);
  transform: translateX(-50%);
  transition: background .4s ease, border-color .4s ease;
}
@media (min-width: 768px) {
  .journey::before {
    content: '';
    position: absolute; top: 0; bottom: 0; left: 50%;
    width: 1px; background: var(--line);
  }
  .journey-node { display: block; }
}

/* ---------- Experience 滚动叙事 ---------- */
.journey-item.jn-item {
  opacity: 0.1;
  transform: translateY(40px);
  filter: blur(2px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.22,1,.36,1), filter .7s ease;
}
.journey-item.jn-item.in-view {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}
.journey-item.jn-item.in-view .tl-role {
  text-shadow: 0 0 24px var(--accent-glow-soft);
}
/* 激活卡片内容左侧青色光边 */
.journey-item.jn-item.in-view .md\\:grid > div {
  position: relative;
}
/* 节点：默认暗灰 */
.journey-node {
  background: var(--bg-primary);
  border: 1px solid var(--text-secondary);
  transition: all .6s ease;
}
.journey-item.jn-item.in-view .journey-node {
  width: 13px; height: 13px;
  background: var(--accent-bright);
  border-color: var(--accent-bright);
  box-shadow: 0 0 0 4px rgba(61,99,255,0.18), 0 0 16px rgba(61,99,255,0.7);
  animation: jn-breathe 2.2s ease-in-out infinite;
}
@keyframes jn-breathe {
  0%,100% { box-shadow: 0 0 0 4px rgba(61,99,255,0.18), 0 0 16px rgba(61,99,255,0.6); }
  50% { box-shadow: 0 0 0 7px rgba(61,99,255,0.08), 0 0 26px rgba(61,99,255,0.95); }
}


/* ---------- detail page typography ---------- */
.detail-hero-title { font-size: clamp(1.73rem, 5.3vw, 5rem); line-height: 1.1; letter-spacing: -0.02em; }
.detail-section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-mono);
  letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--accent-bright);
}
.detail-body { color: var(--text-body); line-height: 1.85; }
.detail-body p + p { margin-top: 1.25em; }

.meta-cell { border-top: 1px solid var(--line); }
.meta-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-mono);
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-secondary);
}

/* next-project footer link */
.next-project .next-title {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  transition: color .4s ease, transform var(--duration-med) var(--ease-smooth);
}
.next-project:hover .next-title { color: var(--accent-bright); transform: translateX(12px); }

/* ---------- 标题层级系统（三级） ---------- */
/* 一级标题：Hero + Next Project（34px/700）*/
.title-1 {
  font-size: 34px;
  font-weight: 700 !important;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* 二级标题：section 主标题 + 子模块标题（20px/600）*/
.title-2 {
  font-size: 20px;
  font-weight: 600 !important;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

/* 三级标题：卡片内小标题 + 列表项标题（16px/500）*/
.title-3 {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.5;
}

/* ---------- 详情页侧边导航（side-rail）：折叠胶囊，hover 展开 ---------- */
.side-rail {
  gap: 6px;
  padding: 10px;
  width: 46px;
  border-radius: 4px;
  background: var(--nav-bg);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: width .45s var(--ease-smooth), box-shadow .45s ease;
}
.side-rail:hover {
  width: 190px;
}
.side-rail .rail-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color .3s ease, background .3s ease;
}
.side-rail .rail-initial {
  width: 18px;
  flex-shrink: 0;
  text-align: center;
  font-weight: 700;
  font-size: 15px;
}
.side-rail .rail-full {
  display: inline-block;
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  white-space: nowrap;
  transition: max-width .45s var(--ease-smooth), opacity .35s ease;
}
.side-rail:hover .rail-full {
  max-width: 150px;
  opacity: 1;
}
.side-rail .rail-item:hover { color: var(--text-primary); background: var(--surface-hover); }
.side-rail .rail-item.is-active { color: var(--accent); font-weight: 600; }
/* 自适应：导航显示时（≥1280），详情页正文左侧让位，避免与导航重叠 */
@media (min-width: 1280px) {
  body.has-side-rail .wrap { padding-left: 90px; }
}
/* ---------- outline text ---------- */
.text-outline {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--text-primary);
}
@media (min-width: 768px) { .text-outline { -webkit-text-stroke-width: 2px; } }
/* 小字号 marquee 里的描边词：描边降至 1px，避免笔画糊在一起 */
.marquee .text-outline { -webkit-text-stroke-width: 1px; }

/* ---------- grain overlay ---------- */
.grain::before {
  content: ''; position: fixed; inset: -50%;
  pointer-events: none; z-index: 50; opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grainShift 8s steps(10) infinite;
}
@keyframes grainShift {
  0%,100% { transform: translate(0,0); } 10% { transform: translate(-5%,-8%); }
  20% { transform: translate(-12%,3%); } 30% { transform: translate(6%,-10%); }
  40% { transform: translate(-4%,12%); } 50% { transform: translate(-10%,4%); }
  60% { transform: translate(12%,0); } 70% { transform: translate(0,10%); }
  80% { transform: translate(3%,12%); } 90% { transform: translate(-8%,4%); }
}

/* ---------- display sizes ---------- */
.hero-title { font-size: clamp(2.2rem, 6.5vw, 6.5rem); line-height: .92; letter-spacing: -0.03em; }
.cta-title { font-size: var(--font-size-cta); line-height: 1; letter-spacing: -0.02em; }

/* ---------- hero 名字逐字母渐入（preloader 揭幕前暂停） ---------- */
.hero-title .ch {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.35em);
  filter: blur(10px);
  animation: chIn 0.9s var(--ease-out) forwards;
  animation-delay: var(--d, 0s);
}
@keyframes chIn {
  to { opacity: 1; transform: translateY(0); filter: blur(0); }
}
body:not(.is-ready) .hero-title .ch { animation-play-state: paused; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .reveal, .mask-line > span { transition: none; animation: none; opacity: 1; transform: none; }
  .hero-title .ch { animation: none; opacity: 1; transform: none; filter: none; }
  .marquee-track, .scroll-line::after, .grain::before, .status-dot { animation: none; }
  .works-progress > span, .trail-img, .row-preview, .circle-btn { transition: none; }
  [data-immersive] { transition: none; opacity: 1; transform: none; }
  .hero-stack { position: relative; }
}


/* ---------- 全站：正文段落下方接配图/图表/卡片网格，至少 40px 间距 ---------- */
/* 规则一：p 后直接接图片/卡片 */
.wrap p + img,
.wrap p + figure,
.wrap p + picture,
.wrap p + .card,
.wrap p + .mini-card {
  margin-top: 40px !important;
}
/* 规则二：所有外层容器（panel/网格/轮播/展示/表格/框），无论前面是不是 p，均至少 40px 上边距 */
.wrap [class*="panel"],
.wrap [class*="-grid"],
.wrap [class*="carousel"],
.wrap [class*="showcase"],
.wrap [class*="-table"],
.wrap [class*="-box"],
.wrap .works-track,
.wrap .gallery,
.wrap .img-grid,
.wrap .phone-mock,
.wrap .mockup,
.wrap .row-preview {
  margin-top: 40px !important;
}

/* ══ Image compare (Bencho, MIT) ═══════════════════════════
   --font-ui / --signal are Bencho's design tokens. They are
   mapped here to this project's own UI font and accent (ink)
   instead of defining new globals. --cg-accent is defined on
   work-1.html's :root, so nothing leaks beyond this component
   when the page loads. */
.cmp {
  --font-ui: var(--font-body);
  --signal: var(--cg-accent, #009688);

  position: relative;
  overflow: hidden;
  touch-action: none;
  cursor: ew-resize;
  outline: none;
  user-select: none;
  -webkit-user-select: none;
  background: #222;
  width: 100%;
  aspect-ratio: 16 / 10;
}
.cmp:focus-visible { box-shadow: 0 0 0 2px var(--signal, #009688); }
.cmp-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  -webkit-user-drag: none;
}
/* no drift now: two separate photographs have to stay exactly in
   register, or the before stops lining up with the after */
.cmp-before { position: absolute; inset: 0; }
.cmp-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  border-radius: 99px;
  background: rgba(23, 24, 26, 0.36);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  pointer-events: none;
}
.cmp-tag.cmp-right { left: auto; right: 12px; }
/* the line is drawn, so it can bend: a 2px white curve with a
   soft glow, over the whole block */
.cmp-line {
  position: absolute;
  inset: 0;
  overflow: visible;
  pointer-events: none;
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.5));
}
.cmp-line path { fill: none; stroke: #fff; stroke-width: 2; }
.cmp-grip { position: absolute; top: 0; bottom: 0; width: 0; pointer-events: none; }
.cmp-knob {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 36px;
  height: 36px;
  translate: -50% -50%;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  color: #17181a;
  box-shadow: 0 2px 12px rgba(23, 24, 26, 0.25);
  transition: scale 260ms cubic-bezier(0.3, 1.5, 0.4, 1);
}
.cmp:hover .cmp-knob { scale: 1.08; }
.cmp[data-held] .cmp-knob { scale: 0.9; }