:root {
  --bg: #ffffff;
  --text: rgba(18, 24, 32, 0.9);
  --soft: rgba(18, 24, 32, 0.56);
  --line: rgba(18, 24, 32, 0.16);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  width: 100%;
  max-width: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  width: 100%;
  max-width: 100vw;
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  background: #ffffff;
  overflow-x: clip;
}

.topbar,
.meta,
.controls {
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
}

.topbar {
  padding-top: 16px;
  padding-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  overflow: visible;
}

.title-group {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1 1 auto;
}

h1 {
  margin: 0;
  flex: 0 1 auto;
  min-width: 0;
  font-size: 0.92rem;
  font-weight: 400;
  letter-spacing: 0.08em;
}

.about-popover {
  position: relative;
  flex: 0 0 auto;
}

.about-button {
  appearance: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--soft);
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 3px 0 5px;
  cursor: pointer;
}

.about-button:focus-visible {
  outline: 1px solid rgba(18, 24, 32, 0.24);
  outline-offset: 4px;
}

.about-panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  z-index: 10;
  width: min(420px, calc(100vw - 32px));
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(18, 24, 32, 0.12);
  box-shadow: 0 18px 40px rgba(18, 24, 32, 0.14);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 160ms ease, transform 160ms ease;
}

.about-panel::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -12px;
  height: 12px;
}

.about-panel p {
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.55;
  color: var(--soft);
}

.about-panel p + p {
  margin-top: 10px;
}

.about-popover:hover .about-panel,
.about-popover:focus-within .about-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.share-button {
  appearance: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 4px 0 6px;
  cursor: pointer;
  flex: 0 0 auto;
  white-space: nowrap;
}

.share-button:disabled {
  opacity: 0.55;
  cursor: default;
}

.viewer {
  padding: 0 8px;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  display: flex;
  justify-content: center;
}

canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 2.39 / 1;
  height: auto;
  max-height: min(70vh, 920px);
  background: #f4f7fb;
}

.meta {
  padding-top: 8px;
  padding-bottom: 8px;
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

#metaLine {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 400;
  color: var(--soft);
  white-space: nowrap;
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.controls {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) minmax(130px, 1fr) minmax(88px, 0.6fr) minmax(88px, 0.6fr) minmax(150px, 1fr);
  gap: 14px;
  align-items: end;
  padding-top: 8px;
  padding-bottom: 16px;
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.control {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.control span {
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--soft);
}

input {
  appearance: none;
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  padding: 5px 0 7px;
  outline: none;
}

input::placeholder {
  color: rgba(244, 247, 252, 0.32);
}

input[list]::-webkit-calendar-picker-indicator {
  opacity: 0;
}

select {
  appearance: none;
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  padding: 5px 0 7px;
  outline: none;
}

.readout {
  margin: 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: 0.82rem;
  padding: 5px 0 7px;
}

@media (max-width: 900px) {
  .controls {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .topbar,
  .meta,
  .controls {
    padding-left: max(8px, env(safe-area-inset-left));
    padding-right: max(8px, env(safe-area-inset-right));
  }

  .topbar {
    padding-top: 10px;
    padding-bottom: 6px;
    gap: 8px;
    overflow: visible;
  }

  h1 {
    font-size: 0.8rem;
    letter-spacing: 0.06em;
  }

  .title-group {
    gap: 8px;
  }

  .about-button {
    font-size: 0.64rem;
    letter-spacing: 0.06em;
  }

  .about-panel {
    width: min(320px, calc(100vw - 16px));
    left: 0;
    padding: 12px 13px;
  }

  .about-panel p {
    font-size: 0.66rem;
    line-height: 1.5;
  }

  .share-button {
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    padding-bottom: 4px;
  }

  canvas {
    max-height: min(50vh, 360px);
  }

  .controls {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  #metaLine {
    font-size: 0.68rem;
  }
}