:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #86868b;
  --hairline: rgba(0, 0, 0, 0.08);
  --selected: #e8e8ed;
  --sidebar: 272px;
  --radius: 14px;
  --shadow: 0 0 0 1px rgba(0, 0, 0, 0.04), 0 10px 28px rgba(0, 0, 0, 0.06);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

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

body {
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  min-height: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 16px 24px;
  border-right: 1px solid var(--hairline);
  background: rgba(251, 251, 253, 0.92);
  overflow: auto;
}

.brand {
  padding: 0 10px 22px;
}

.brand-kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  font-weight: 600;
}

.brand-title {
  margin-top: 4px;
  font-size: 22px;
  font-weight: 650;
  letter-spacing: -0.03em;
}

.nav-group + .nav-group {
  margin-top: 22px;
}

.nav-label {
  padding: 0 10px 8px;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 5px;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.35;
  color: var(--text);
}

.nav-item-title {
  display: block;
}

.issue-line {
  margin: 0;
  font-size: 11px;
  font-weight: 400;
  font-synthesis: none;
  line-height: 1.4;
  color: var(--muted);
}

.stage-header .issue-line {
  margin-top: 8px;
  font-size: 13px;
}

.nav-item:hover {
  background: rgba(0, 0, 0, 0.035);
}

.nav-item.is-active {
  background: var(--selected);
}

.nav-item.is-active .nav-item-title {
  font-weight: 590;
}

.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.stage-body {
  position: relative;
  flex: 1;
  min-height: 0;
}

.filmstrip {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 12px 56px 40px;
  scrollbar-width: thin;
}

.stage-header {
  padding: 28px 36px 8px;
  flex: 0 0 auto;
}

.stage-header h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 650;
  letter-spacing: -0.04em;
}

.stage-meta {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.frame {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: min(78vw, 1100px);
}

.shot {
  display: block;
  height: min(64vh, 620px);
  width: auto;
  max-width: min(78vw, 1100px);
  object-fit: contain;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.frame-caption {
  margin-top: 12px;
  padding: 0 2px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

.frame-index {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.frame-title {
  min-width: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.connector {
  flex: 0 0 auto;
  width: 36px;
  height: min(64vh, 620px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #d2d2d7;
}

.connector svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.lightbox[hidden] {
  display: none;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
}

.lightbox-scrim {
  position: absolute;
  inset: 0;
  background: rgba(22, 22, 23, 0.72);
  backdrop-filter: saturate(140%) blur(18px);
}

.lightbox-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  color: #f5f5f7;
}

.lightbox-caption {
  text-align: center;
  min-width: 0;
}

#lightbox-title {
  font-size: 14px;
  font-weight: 560;
}

.lightbox-index {
  margin-top: 2px;
  font-size: 12px;
  color: rgba(245, 245, 247, 0.62);
}

.lightbox-actions {
  display: flex;
  gap: 8px;
}

.icon-btn,
.nav-arrow,
.text-btn {
  color: #f5f5f7;
}

.icon-btn,
.nav-arrow {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.08);
}

.icon-btn:hover,
.nav-arrow:hover,
.text-btn:hover {
  background: rgba(255, 255, 255, 0.16);
}

.icon-btn svg,
.nav-arrow svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.text-btn {
  height: 32px;
  padding: 0 12px;
  border-radius: 980px;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.08);
}

.nav-arrow {
  position: absolute;
  top: 50%;
  z-index: 2;
  transform: translateY(-50%);
}

.nav-arrow.prev {
  left: 18px;
}

.nav-arrow.next {
  right: 18px;
}

.nav-arrow:disabled {
  opacity: 0.28;
  cursor: default;
}

.lightbox-figure {
  position: absolute;
  inset: 72px 80px 28px;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-figure img {
  max-width: calc(100vw - 176px);
  max-height: calc(100vh - 112px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 30;
  transform: translateX(-50%);
  padding: 10px 14px;
  border-radius: 980px;
  background: rgba(29, 29, 31, 0.88);
  color: #f5f5f7;
  font-size: 13px;
}

.strip-arrow {
  position: absolute;
  top: calc(50% - 24px);
  z-index: 3;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.strip-arrow.prev {
  left: 12px;
}

.strip-arrow.next {
  right: 12px;
}

.strip-arrow:hover {
  background: #f2f2f4;
}

.strip-arrow[hidden] {
  display: none !important;
}

.strip-arrow svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.toast[hidden] {
  display: none;
}

@media (max-width: 860px) {
  body {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--hairline);
  }

  .main {
    height: auto;
    min-height: calc(100vh - 120px);
  }

  .lightbox-figure {
    inset: 72px 16px 24px;
  }

  .nav-arrow {
    display: none;
  }
}