:root {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #111827;
  --muted: #64748b;
  --line: #dbe3ef;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --ok: #15803d;
  --warn: #b45309;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.app-shell {
  width: min(100%, 520px);
  margin: 0 auto;
  padding: 20px 16px 32px;
}

.app-header {
  padding: 12px 0 8px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 6px;
  font-size: 2rem;
  line-height: 1.1;
}

h2 {
  margin-bottom: 12px;
  font-size: 1.08rem;
}

.summary,
.hint {
  color: var(--muted);
}

.hint {
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.tool-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 16px 0;
}

.tool-nav__link {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 8px;
  background: var(--panel);
  color: var(--text);
  text-align: center;
  text-decoration: none;
  font-size: 0.92rem;
}

.tool-nav__link--active {
  border-color: var(--primary);
  background: #eff6ff;
  color: var(--primary-dark);
  font-weight: 700;
}

.tool-nav__link--disabled {
  color: #94a3b8;
}

.panel {
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
}

.panel-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel-title-row h2 {
  margin-bottom: 0;
}

.check-list,
.info-list {
  display: grid;
  grid-template-columns: minmax(108px, 42%) 1fr;
  gap: 8px 12px;
  margin: 0;
}

.check-list dt,
.info-list dt {
  color: var(--muted);
  font-weight: 700;
}

.check-list dd,
.info-list dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.check-ok {
  color: var(--ok);
  font-weight: 700;
}

.check-warn {
  color: var(--warn);
  font-weight: 700;
}

.check-error {
  color: var(--danger);
  font-weight: 700;
}

.status-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #f8fafc;
  overflow-wrap: anywhere;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 12px;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 10px 12px;
  background: var(--primary);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--primary-dark);
}

button:disabled {
  background: #cbd5e1;
  color: #64748b;
  cursor: default;
}

.button-secondary {
  min-height: 36px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
}

.button-secondary:hover:not(:disabled) {
  background: #f1f5f9;
}

code {
  font-size: 0.85rem;
}

.log-list {
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  max-height: 320px;
  margin: 12px 0 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.log-list li {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #f8fafc;
  overflow-wrap: anywhere;
}

.log-time {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.app-shell {
  width: min(100%, 760px);
}

h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.slot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.slot-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #f8fafc;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.file-control {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--muted);
  font-weight: 700;
}

.file-control input,
.settings-row input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

.media-player {
  display: block;
  width: 100%;
  max-height: 420px;
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0f172a;
}

.settings-row {
  display: grid;
  grid-template-columns: minmax(88px, 1fr) auto minmax(96px, 130px) auto;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.settings-row label {
  color: var(--muted);
  font-weight: 700;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.checkbox-row input {
  width: 18px;
  height: 18px;
}

@media (max-width: 640px) {
  .slot-grid,
  .button-grid {
    grid-template-columns: 1fr;
  }

  .button-row {
    grid-template-columns: 1fr;
  }

  .settings-row {
    grid-template-columns: 1fr 1fr;
  }

  .settings-row label,
  .settings-row input {
    grid-column: 1 / -1;
  }
}