:root {
  color-scheme: dark;
  --bg: #111111;
  --panel: #1a1a1a;
  --panel-soft: #202020;
  --line: #343434;
  --text: #f4f4f4;
  --muted: #a7a7a7;
  --accent: #00d1bd;
  --accent-strong: #23f0dc;
  --danger: #ff5a70;
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(0, 209, 189, 0.13), transparent 30rem),
    linear-gradient(180deg, #151515 0%, #101010 100%);
  font-family: "Segoe UI", "Yu Gothic UI", "Yu Gothic", sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.35rem, 2vw, 2rem);
}

h2 {
  font-size: 1rem;
}

.header-actions,
.viewer-options,
.list-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.support-badge {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  padding: 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.85rem;
}

.support-badge.ok {
  color: var(--accent-strong);
  border-color: rgba(0, 209, 189, 0.5);
}

.support-badge.warn {
  color: #ffd166;
  border-color: rgba(255, 209, 102, 0.4);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(18rem, 24rem) minmax(0, 1fr);
  align-items: start;
  gap: 1rem;
  width: min(100%, 1280px);
  margin: 0 auto;
  padding: 1rem;
}

.deck-panel,
.viewer-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(26, 26, 26, 0.94);
  box-shadow: var(--shadow);
}

.deck-panel {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 6rem);
  padding: 1rem;
}

.viewer-panel {
  display: grid;
  grid-template-rows: auto auto auto auto;
  align-self: start;
  gap: 1rem;
  min-height: 0;
  height: fit-content;
  padding: 1rem;
}

.drop-zone {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 5rem;
  padding: 1rem;
  border: 1px dashed rgba(0, 209, 189, 0.55);
  border-radius: 8px;
  background: rgba(0, 209, 189, 0.08);
}

.drop-zone.dragging {
  border-color: var(--accent-strong);
  background: rgba(0, 209, 189, 0.16);
}

.drop-zone strong,
.drop-zone span,
.empty-state strong,
.empty-state span {
  display: block;
}

.drop-zone span,
.empty-state span,
.list-header p,
.status-line {
  color: var(--muted);
  font-size: 0.9rem;
}

.settings-row {
  padding: 0.9rem 0;
}

.pip-settings {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.settings-stack {
  display: grid;
  gap: 0.5rem;
}

.settings-title {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.settings-hint {
  color: var(--muted);
  font-size: 0.78rem;
}

.settings-choice-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.check-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.list-header {
  justify-content: space-between;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.thumb-list {
  display: grid;
  gap: 0.65rem;
  min-height: 0;
  padding-top: 0.75rem;
  overflow: auto;
}

.thumb-item {
  display: grid;
  grid-template-columns: 4.75rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.thumb-item.active {
  border-color: rgba(0, 209, 189, 0.8);
  box-shadow: inset 0 0 0 1px rgba(0, 209, 189, 0.22);
}

.thumb-item img {
  width: 4.75rem;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 6px;
  background: #0a0a0a;
}

.thumb-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 700;
}

.thumb-sub {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.thumb-actions {
  display: grid;
  grid-template-columns: repeat(2, 2rem);
  gap: 0.35rem;
}

.preview-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%),
    #0b0b0b;
  background-size: 1.5rem 1.5rem;
}

.preview-stage.separate {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  place-items: normal;
  gap: 0.5rem;
}

.preview-stage.auto-hide-controls.separate {
  display: grid;
  place-items: center;
  gap: 0;
}

#preview-image {
  display: none;
  width: 100%;
  height: auto;
  object-fit: contain;
}

#preview-image.cover {
  object-fit: cover;
}

.empty-state {
  max-width: 34rem;
  padding: 1rem;
  text-align: center;
}

.empty-state strong {
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.viewer-options {
  justify-content: flex-end;
  flex-wrap: wrap;
}

.viewer-options label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

select {
  min-height: 2.4rem;
  padding: 0 2rem 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: #171717;
}

.primary-button,
.secondary-button,
.danger-button,
.icon-button,
.mini-button {
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--text);
  background: #242424;
}

.primary-button {
  min-height: 2.6rem;
  padding: 0 1rem;
  color: #05110f;
  background: var(--accent);
  font-weight: 800;
}

.primary-button:hover {
  background: var(--accent-strong);
}

.secondary-button,
.danger-button {
  min-height: 2.4rem;
  padding: 0 0.85rem;
  border-color: var(--line);
}

.secondary-button:hover,
.icon-button:hover,
.mini-button:hover {
  border-color: rgba(0, 209, 189, 0.55);
}

.danger-button {
  color: var(--danger);
  border-color: rgba(255, 90, 112, 0.3);
}

.icon-button {
  width: 3rem;
  height: 3rem;
  font-size: 1.45rem;
  font-weight: 800;
}

.mini-button {
  width: 2rem;
  height: 2rem;
  font-size: 0.85rem;
}

.mini-button.danger {
  color: var(--danger);
}

.status-line {
  min-height: 1.4rem;
  text-align: right;
}

body.modal-open {
  overflow: hidden;
}

.guide-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
}

.guide-backdrop[hidden] {
  display: none;
}

.guide-dialog {
  width: min(100%, 42rem);
  max-height: min(100%, 42rem);
  overflow: auto;
  border: 1px solid rgba(0, 209, 189, 0.28);
  border-radius: 8px;
  background: #171717;
  box-shadow: var(--shadow);
}

.guide-header,
.guide-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.guide-header {
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

.guide-steps {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 1rem 1rem 0.25rem 2.5rem;
}

.guide-substeps {
  margin: 0.35rem 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
  line-height: 1.65;
}

.guide-substeps li {
  padding-left: 0.1rem;
}

.guide-mode-list {
  display: grid;
  gap: 0.35rem;
  margin: 0.45rem 0 0;
}

.guide-mode-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

.guide-mode-list dt,
.guide-mode-list dd {
  margin: 0;
  font-size: 0.88rem;
}

.guide-mode-list dt {
  color: var(--text);
  font-weight: 700;
}

.guide-mode-list dd {
  color: var(--accent-strong);
  font-weight: 800;
}

.guide-mode-list dd.unavailable {
  color: var(--danger);
}

.guide-url {
  color: var(--text);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.88rem;
}

.guide-steps > li {
  padding-left: 0.25rem;
}

.guide-steps strong,
.guide-steps span,
.guide-steps small {
  display: block;
}

.guide-steps strong {
  margin-bottom: 0.2rem;
}

.guide-steps span {
  color: var(--muted);
  line-height: 1.65;
}

.guide-link {
  color: var(--accent-strong);
  font-weight: 800;
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.18em;
}

.guide-link:hover {
  color: #ffffff;
}

.copy-url-button {
  min-height: 1.9rem;
  margin-top: 0.35rem;
  padding: 0 0.6rem;
  border: 1px solid rgba(0, 209, 189, 0.45);
  border-radius: 6px;
  color: var(--accent-strong);
  background: rgba(0, 209, 189, 0.08);
  font-size: 0.82rem;
  font-weight: 800;
}

.copy-url-button:hover {
  background: rgba(0, 209, 189, 0.14);
}

.guide-note {
  margin-top: 0.45rem;
  color: #ffd166;
  font-size: 0.82rem;
  line-height: 1.6;
}

.guide-check {
  margin: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.guide-actions {
  justify-content: flex-end;
  padding: 0 1rem 1rem;
}

body.pip-body {
  width: 100vw;
  height: 100vh;
  min-height: 0;
  margin: 0;
  overflow: hidden;
  background: #050505;
}

.pip-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #050505;
}

.pip-shell.separate {
  display: flex;
  flex-direction: column;
}

.pip-shell.auto-hide-controls.separate {
  display: block;
}

.pip-shell img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pip-shell.separate img {
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
}

.pip-shell.auto-hide-controls.separate img {
  flex: none;
  height: 100%;
}

.pip-shell img.cover {
  object-fit: cover;
}

.pip-controls {
  --pip-control-button-width: 4.25rem;
  --pip-control-button-height: 3rem;
  --pip-control-button-font-size: 1.6rem;
  --pip-control-gap: 0.5rem;
  --pip-control-padding: 0.5rem;
  --pip-control-label-padding-y: 0.65rem;
  --pip-control-label-padding-x: 0.75rem;
  --pip-control-label-font-size: 0.9rem;
  position: absolute;
  inset: auto 0 0;
  display: grid;
  grid-template-columns: var(--pip-control-button-width) minmax(0, 1fr) var(--pip-control-button-width);
  align-items: stretch;
  gap: var(--pip-control-gap);
  padding: var(--pip-control-padding);
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.78));
}

.pip-controls.small {
  --pip-control-button-width: 3.5rem;
  --pip-control-button-height: 2.5rem;
  --pip-control-button-font-size: 1.25rem;
  --pip-control-gap: 0.35rem;
  --pip-control-padding: 0.35rem;
  --pip-control-label-padding-y: 0.45rem;
  --pip-control-label-padding-x: 0.6rem;
  --pip-control-label-font-size: 0.82rem;
}

.pip-controls.medium {
  --pip-control-button-width: 4.25rem;
  --pip-control-button-height: 3rem;
  --pip-control-button-font-size: 1.6rem;
  --pip-control-gap: 0.5rem;
  --pip-control-padding: 0.5rem;
  --pip-control-label-padding-y: 0.65rem;
  --pip-control-label-padding-x: 0.75rem;
  --pip-control-label-font-size: 0.9rem;
}

.pip-controls.large {
  --pip-control-button-width: 5rem;
  --pip-control-button-height: 3.5rem;
  --pip-control-button-font-size: 1.9rem;
  --pip-control-gap: 0.65rem;
  --pip-control-padding: 0.65rem;
  --pip-control-label-padding-y: 0.85rem;
  --pip-control-label-padding-x: 1rem;
  --pip-control-label-font-size: 1rem;
}

.preview-pip-controls {
  z-index: 2;
}

.preview-pip-controls.separate {
  position: static;
  inset: auto;
  width: 100%;
  margin: 0;
}

.auto-hide-controls .preview-pip-controls.separate,
.auto-hide-controls .pip-controls.separate {
  position: absolute;
  width: auto;
  margin: 0;
  order: initial;
}

.auto-hide-controls .pip-controls.separate.top {
  inset: 0 0 auto;
}

.auto-hide-controls .pip-controls.separate.bottom {
  inset: auto 0 0;
}

.pip-controls.top {
  inset: 0 0 auto;
  background: linear-gradient(0deg, transparent, rgba(0, 0, 0, 0.78));
}

.pip-controls.bottom {
  inset: auto 0 0;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.78));
}

.pip-controls.separate {
  position: static;
  width: 100%;
  margin: 0;
  padding: var(--pip-control-padding);
  background: rgba(14, 14, 14, 0.82);
  box-sizing: border-box;
}

.pip-controls.separate.top {
  order: -1;
}

.pip-controls.separate.bottom {
  order: 1;
}

.pip-controls.separate .pip-button,
.pip-controls.separate .pip-label {
  backdrop-filter: none;
}

.pip-controls.background-translucent.top {
  background: linear-gradient(0deg, transparent, rgba(0, 0, 0, 0.38));
}

.pip-controls.background-translucent.bottom {
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.38));
}

.pip-controls.background-translucent.separate {
  background: rgba(14, 14, 14, 0.42);
}

.pip-controls.background-clear.top,
.pip-controls.background-clear.bottom,
.pip-controls.background-clear.separate {
  background: transparent;
}

.pip-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--pip-control-button-width);
  height: 100%;
  padding: 0;
  line-height: 1;
  box-sizing: border-box;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
  color: #f6f6f6;
  background: rgba(14, 14, 14, 0.9);
  font-size: var(--pip-control-button-font-size);
  font-weight: 900;
}

.pip-label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  height: 100%;
  padding: var(--pip-control-label-padding-y) var(--pip-control-label-padding-x);
  box-sizing: border-box;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  color: #f6f6f6;
  background: rgba(14, 14, 14, 0.76);
  font-size: var(--pip-control-label-font-size);
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pip-controls.background-translucent .pip-button {
  border-color: rgba(255, 255, 255, 0.34);
  background: rgba(14, 14, 14, 0.58);
}

.pip-controls.background-translucent .pip-label {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(14, 14, 14, 0.5);
}

.pip-controls.background-clear .pip-button {
  border-color: rgba(255, 255, 255, 0.38);
  background: rgba(14, 14, 14, 0.18);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
}

.pip-controls.background-clear .pip-label {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(14, 14, 14, 0.14);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
}

.auto-hide-controls .pip-controls {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 140ms ease,
    visibility 0s linear 140ms;
}

.auto-hide-controls:hover .pip-controls,
.auto-hide-controls:focus-within .pip-controls {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}

@media (max-width: 860px) {
  .app-header,
  .app-shell {
    display: block;
  }

  .header-actions {
    margin-top: 1rem;
  }

  .app-shell {
    padding: 0.75rem;
  }

  .deck-panel {
    max-height: none;
    margin-bottom: 0.75rem;
  }

  .viewer-panel {
    min-height: 0;
  }
}

@media (max-width: 560px) {
  .header-actions,
  .drop-zone {
    align-items: stretch;
    flex-direction: column;
  }

  .support-badge,
  .primary-button,
  .secondary-button,
  .danger-button {
    justify-content: center;
    width: 100%;
  }

  .guide-header {
    align-items: flex-start;
  }

  .guide-actions .primary-button {
    width: 100%;
  }
}