:root {
  color-scheme: dark;
  --bg: #000;
  --panel: #050505;
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #fff;
  --muted: rgba(255, 255, 255, 0.6);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.06), transparent 26%),
    #000;
  color: var(--text);
}

body.modal-open {
  overflow: hidden;
}

.page {
  min-height: 100vh;
  padding: 28px 20px 48px;
}

.hero {
  max-width: 1080px;
  margin: 0 auto 22px;
}

.hero-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
}

.lang-button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  line-height: 1;
  padding: 7px 10px;
  border-radius: 999px;
  cursor: pointer;
}

.lang-button.is-active {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
}

.repo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 78px;
  padding: 8px 11px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  line-height: 1;
  transition:
    background 180ms ease,
    border-color 180ms ease,
    transform 180ms ease;
}

.repo-link:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.repo-link-icon {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.repo-link-text {
  white-space: nowrap;
}

.showcase {
  max-width: 1080px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  margin: 0;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.08;
  font-weight: 600;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.curve-card {
  padding: 15px 15px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.01)),
    var(--panel);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 24px 60px rgba(0, 0, 0, 0.36);
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.curve-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.16);
}

.curve-card.is-active {
  border-color: rgba(255, 255, 255, 0.24);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.015)),
    var(--panel);
}

.curve-frame {
  min-height: 180px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.055), transparent 58%),
    rgba(255, 255, 255, 0.01);
}

.curve-svg {
  width: 118px;
  height: 118px;
  overflow: visible;
  flex-shrink: 0;
}

.curve-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
}

.curve-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}

.curve-tag {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.curve-desc {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.viewer-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 20px 16px;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 220ms ease, visibility 0s linear 220ms;
}

.viewer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.74);
  backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 260ms ease;
}

.viewer-modal.is-open,
.viewer-modal.is-entering {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transition: opacity 220ms ease, visibility 0s linear 0s;
}

.viewer-modal.is-open .viewer-backdrop,
.viewer-modal.is-entering .viewer-backdrop {
  opacity: 1;
}

.viewer {
  position: relative;
  z-index: 1;
  width: min(1040px, calc(100vw - 32px));
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.9fr);
  gap: 14px;
  opacity: 0;
  transform-origin: top left;
  transform:
    translate(var(--viewer-translate-x, 0), var(--viewer-translate-y, 0))
    scale(var(--viewer-scale, 0.92));
  transition:
    transform 360ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 220ms ease;
}

.viewer-modal.is-open .viewer {
  opacity: 1;
  transform: translate(0, 0) scale(1);
}

.viewer-preview,
.viewer-code-panel {
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.01)),
    var(--panel);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 24px 60px rgba(0, 0, 0, 0.36);
  min-height: 0;
}

.viewer-preview {
  padding: 18px;
  min-width: 0;
}

.viewer-stage {
  min-height: 320px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.06), transparent 60%),
    rgba(255, 255, 255, 0.01);
}

.viewer-svg {
  width: min(100%, 250px);
  height: auto;
  aspect-ratio: 1;
  overflow: visible;
  flex-shrink: 0;
}

.viewer-copy {
  margin-top: 14px;
}

.viewer-controls-block,
.viewer-formula-block {
  margin-top: 18px;
}

.viewer-formula-panel {
  margin-top: 14px;
}

.viewer-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.viewer-reset {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 10px;
  font: inherit;
  font-size: 11px;
  cursor: pointer;
}

.viewer-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.viewer-control {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.025);
}

.viewer-control-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.viewer-control-label {
  font-size: 11px;
  color: var(--muted);
}

.viewer-control-value {
  font-family: "SF Mono", "JetBrains Mono", "Menlo", monospace;
  font-size: 11px;
  color: var(--text);
}

.viewer-control input[type="range"] {
  width: 100%;
  margin: 0;
  accent-color: #ffffff;
  background: transparent;
}

.viewer-tag,
.viewer-code-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.viewer-title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.08;
}

.viewer-desc {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.viewer-formula {
  margin: 0;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: #f2f2f2;
  font-family: "SF Mono", "JetBrains Mono", "Menlo", monospace;
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.viewer-code-panel {
  padding: 14px;
  min-width: 0;
  overflow: auto;
}

.viewer-code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.viewer-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.viewer-close {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  font: inherit;
  cursor: pointer;
}

.viewer-code {
  margin: 0;
  min-height: 200px;
  max-height: calc(100vh - 170px);
  overflow: auto;
  padding: 14px;
  border-radius: 14px;
  background: #020202;
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: #f5f5f5;
  font-family: "SF Mono", "JetBrains Mono", "Menlo", monospace;
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-wrap;
}

@media (max-width: 640px) {
  .page {
    padding: 22px 14px 32px;
  }

  .showcase {
    max-width: 1200px;
  }

  .gallery {
    grid-template-columns: 1fr;
  }

  .viewer {
    width: min(100vw - 24px, 760px);
    grid-template-columns: 1fr;
  }

  .viewer-controls {
    grid-template-columns: 1fr;
  }

  .viewer-stage {
    min-height: 240px;
  }

  .curve-frame {
    min-height: 170px;
  }
}