:root {
  color-scheme: dark;
  --screen-bg: #050608;
  --screen-panel: rgba(17, 20, 28, 0.88);
  --screen-panel-strong: rgba(27, 32, 44, 0.96);
  --screen-border: rgba(255, 255, 255, 0.12);
  --screen-text: #f6f7fb;
  --screen-muted: #a5adbd;
  --screen-accent: #7c9cff;
  --screen-danger: #f97373;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--screen-bg);
  color: var(--screen-text);
}

button,
a,
input {
  font: inherit;
}

button,
.screen-bg-display-link,
.screen-bg-file {
  border: 1px solid var(--screen-border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--screen-text);
}

button,
.screen-bg-file {
  cursor: pointer;
}

button {
  padding: 0.82rem 1rem;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

button:hover,
.screen-bg-display-link:hover,
.screen-bg-file:hover {
  transform: translateY(-1px);
  border-color: rgba(124, 156, 255, 0.62);
  background: rgba(124, 156, 255, 0.14);
}

.screen-bg-primary {
  background: linear-gradient(135deg, #6687ff, #7f6dff);
  border-color: transparent;
  color: white;
  font-weight: 750;
}

.screen-bg-control-page {
  background:
    radial-gradient(circle at 18% 16%, rgba(124, 156, 255, 0.22), transparent 30%),
    radial-gradient(circle at 84% 10%, rgba(99, 102, 241, 0.16), transparent 28%),
    linear-gradient(180deg, #080a10, #030407);
}

.screen-bg-shell {
  width: min(1480px, calc(100vw - 2rem));
  height: 100dvh;
  margin: 0 auto;
  padding: clamp(0.75rem, 2vw, 1.4rem) 0;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr);
  gap: 0.8rem;
  align-items: stretch;
  overflow: hidden;
}

.screen-bg-panel {
  border: 1px solid var(--screen-border);
  border-radius: 24px;
  background: var(--screen-panel);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(18px);
  padding: clamp(0.85rem, 1.6vw, 1.15rem);
}

.screen-bg-panel--main,
.screen-bg-panel--side,
.screen-bg-heading,
.screen-bg-controls {
  display: grid;
  gap: 0.7rem;
}

.screen-bg-panel--main {
  grid-template-rows: auto minmax(250px, 1fr) auto;
  min-height: 0;
}

.screen-bg-panel--side {
  align-content: start;
  max-height: calc(100dvh - 1.5rem);
  overflow: auto;
}

.screen-bg-kicker {
  margin: 0;
  color: var(--screen-accent);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4.2vw, 3.7rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
}

h2 {
  font-size: 1.1rem;
}

.screen-bg-heading p:not(.screen-bg-kicker),
.screen-bg-note,
.screen-bg-status {
  color: var(--screen-muted);
  line-height: 1.55;
}

.screen-bg-preview {
  position: relative;
  min-height: 250px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--screen-border);
  border-radius: 22px;
  background: #000;
}

.screen-bg-preview img,
.screen-bg-preview video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.screen-bg-black-preview {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: #000;
  color: var(--screen-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.screen-bg-file {
  display: grid;
  gap: 0.42rem;
  padding: 0.72rem;
}

.screen-bg-file input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.screen-bg-file__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 2.35rem;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(102, 135, 255, 0.24), rgba(127, 109, 255, 0.18));
  color: var(--screen-text);
  font-weight: 800;
}

.screen-bg-file__meta {
  color: var(--screen-muted);
  font-size: 0.78rem;
  text-align: center;
}

.screen-bg-button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.screen-bg-button-row--primary {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.screen-bg-open-main {
  width: 100%;
}

.screen-bg-seek {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.65rem;
  align-items: center;
  padding: 0.5rem 0.72rem;
  border: 1px solid var(--screen-border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.045);
  color: var(--screen-muted);
  font-variant-numeric: tabular-nums;
}

.screen-bg-seek input[type="range"] {
  width: 100%;
  accent-color: var(--screen-accent);
}

.screen-bg-loop-range {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, auto)) minmax(0, 1fr);
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem 0.72rem;
  border: 1px solid var(--screen-border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.045);
  color: var(--screen-muted);
}

.screen-bg-loop-range button {
  padding: 0.48rem 0.68rem;
}

.screen-bg-loop-range span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.82rem;
  text-align: right;
}

.screen-bg-fit {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  border: 1px solid var(--screen-border);
  border-radius: 14px;
  padding: 0.6rem 0.75rem;
}

.screen-bg-inline-options {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr) auto;
  gap: 0.5rem;
  align-items: stretch;
}

.screen-bg-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-width: 82px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--screen-border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
}

.screen-bg-fit legend {
  padding: 0 0.35rem;
  color: var(--screen-muted);
}

.screen-bg-list {
  display: grid;
  gap: 0.55rem;
}

.screen-bg-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) auto;
  gap: 0.58rem;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 0.48rem;
}

.screen-bg-item.is-active {
  border-color: rgba(124, 156, 255, 0.7);
  background: rgba(124, 156, 255, 0.16);
}

.screen-bg-item img,
.screen-bg-item__thumb {
  width: 46px;
  height: 34px;
  border-radius: 8px;
  background: #000;
}

.screen-bg-item img {
  object-fit: cover;
}

.screen-bg-item__thumb {
  display: grid;
  place-items: center;
  color: white;
  background: linear-gradient(135deg, #312e81, #111827);
}

.screen-bg-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.screen-bg-item small {
  color: var(--screen-muted);
  font-size: 0.72rem;
}

.screen-bg-note {
  padding: 0.7rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
}

.screen-bg-display-link {
  display: inline-flex;
  justify-content: center;
  padding: 0.68rem 0.9rem;
  text-decoration: none;
}

.screen-bg-display-stage {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #000;
}

.screen-bg-display-stage img,
.screen-bg-display-stage video {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  display: none;
}

.screen-bg-display-stage.is-cover img,
.screen-bg-display-stage.is-cover video {
  object-fit: cover;
}

.screen-bg-display-stage.has-image img {
  display: block;
}

.screen-bg-display-stage.has-video video {
  display: block;
}

.screen-bg-display-stage.is-black img,
.screen-bg-display-stage.is-black video,
.screen-bg-display-stage.is-black .screen-bg-display-empty {
  display: none;
}

.screen-bg-display-empty {
  display: grid;
  gap: 0.45rem;
  text-align: center;
  color: var(--screen-muted);
}

.screen-bg-display-empty strong {
  color: var(--screen-text);
  font-size: clamp(1.5rem, 4vw, 3rem);
}

.screen-bg-display-help {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  gap: clamp(0.82rem, 1.5vw, 1.15rem);
  align-items: center;
  justify-content: center;
  width: min(600px, calc(100vw - 3rem));
  min-height: min(224px, calc(100vh - 4rem));
  padding: clamp(0.95rem, 2vw, 1.5rem);
  border: 1px solid color-mix(in srgb, var(--screen-accent) 40%, var(--screen-border));
  border-radius: 24px;
  background: rgba(12, 14, 20, 0.86);
  color: var(--screen-text);
  font-size: clamp(0.86rem, 1.2vw, 1.08rem);
  font-weight: 500;
  line-height: 1.32;
  text-align: center;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.44);
  backdrop-filter: blur(20px);
}

.screen-bg-display-help__message {
  display: grid;
  gap: 0.18em;
  color: rgba(245, 247, 255, 0.78);
}

.screen-bg-display-help__message span {
  display: block;
  justify-self: center;
  width: max-content;
  max-width: 100%;
}

.screen-bg-display-help button {
  flex: 0 0 auto;
  min-width: min(388px, 100%);
  padding: clamp(0.88rem, 1.75vw, 1.15rem) clamp(1.35rem, 2.8vw, 2.1rem);
  border-radius: 18px;
  background: linear-gradient(135deg, #6687ff, #7f6dff);
  border-color: transparent;
  color: white;
  font-weight: 900;
  font-size: clamp(1.06rem, 2vw, 1.55rem);
  letter-spacing: 0.02em;
  box-shadow: 0 12px 28px rgba(102, 135, 255, 0.26);
}

.screen-bg-display-stage:fullscreen .screen-bg-display-help {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 820px) {
  .screen-bg-shell {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100dvh;
    overflow: visible;
  }

  .screen-bg-panel--side {
    max-height: none;
  }

  .screen-bg-inline-options {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 760px) and (min-width: 821px) {
  .screen-bg-shell {
    padding: 0.55rem 0;
  }

  .screen-bg-panel {
    padding: 0.72rem;
  }

  .screen-bg-panel--main,
  .screen-bg-panel--side,
  .screen-bg-heading,
  .screen-bg-controls {
    gap: 0.52rem;
  }

  .screen-bg-panel--main {
    grid-template-rows: auto minmax(170px, 0.58fr) auto;
  }

  h1 {
    font-size: clamp(1.7rem, 3.8vw, 2.7rem);
  }

  .screen-bg-heading p:not(.screen-bg-kicker) {
    font-size: 0.88rem;
    line-height: 1.42;
  }

  .screen-bg-preview {
    min-height: 170px;
  }

  .screen-bg-file,
  button {
    padding: 0.5rem 0.72rem;
  }

  .screen-bg-fit,
  .screen-bg-note {
    padding: 0.55rem 0.72rem;
  }

  .screen-bg-button-row {
    gap: 0.45rem;
  }
}

@media (max-width: 520px) {
  .screen-bg-button-row,
  .screen-bg-button-row--primary,
  .screen-bg-seek,
  .screen-bg-loop-range {
    grid-template-columns: 1fr;
  }

  .screen-bg-loop-range span {
    text-align: center;
  }

  .screen-bg-display-help {
    display: grid;
    gap: 1rem;
    width: calc(100vw - 2rem);
    min-height: min(300px, calc(100vh - 2rem));
    padding: 1.25rem;
  }

  .screen-bg-display-help button {
    width: 100%;
    min-width: 0;
  }
}