:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1c2024;
  --text-dim: #6b7280;
  --border: #d9dde3;
  --accent: #2f6df6;
  --accent-contrast: #ffffff;
  --accent-soft: #e7efff;
  --danger: #d64545;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino,
    "Book Antiqua", Georgia, "Songti SC", "Noto Serif CJK SC", serif;
}

/* Light is the default; dark is opt-in via the toggle (persisted to
   localStorage and applied pre-paint by the inline script in index.html).
   prefers-color-scheme is intentionally not consulted. */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1115;
  --surface: #181b21;
  --surface-2: #1f232b;
  --text: #e7e9ee;
  --text-dim: #9aa3b2;
  --border: #2c313b;
  --accent: #5b8dff;
  --accent-contrast: #0b1220;
  --accent-soft: #1c2740;
  --danger: #f2777a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

/* ---------- header ---------- */

.site-head-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.site-head h1 {
  margin: 0 0 6px;
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.theme-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }

.tagline {
  margin: 0;
  max-width: 68ch;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.status {
  margin: 28px 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.status.is-error { color: var(--danger); }

/* ---------- translator layout ---------- */

.translator {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 260px;
}

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: var(--radius) var(--radius) 0 0;
  min-height: 48px;
  flex-wrap: wrap;
}

/* ---------- chips ---------- */

.chips { display: flex; gap: 6px; flex-wrap: wrap; }

.chip {
  font: inherit;
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.chip:hover { color: var(--text); }
.chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}
.chip.is-detected:not(.is-active) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.detected {
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ---------- input ---------- */

.input {
  flex: 1;
  border: 0;
  resize: vertical;
  padding: 16px;
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.6;
  background: transparent;
  color: var(--text);
  min-height: 160px;
}
.input:focus { outline: none; }
.input::placeholder { color: var(--text-dim); opacity: 0.7; }

.pane-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- output ---------- */

.output {
  flex: 1;
  padding: 16px;
  font-family: var(--mono);
  font-size: 1.05rem;
  line-height: 1.9;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}
.output.is-empty { color: var(--text-dim); font-family: var(--serif); }

.hint {
  margin: 0;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  font-size: 0.78rem;
  color: var(--text-dim);
}
.hint-poly {
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

/* ---------- polyphone tooltip ---------- */

.poly {
  position: relative;
  color: var(--accent);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
  cursor: pointer;
  border-radius: 3px;
}
.poly:hover,
.poly:focus-visible {
  background: var(--accent-soft);
  outline: none;
}

.poly-tip {
  position: absolute;
  left: 50%;
  top: calc(100% + 8px);
  transform: translateX(-50%) translateY(-4px);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 96px;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.12s, transform 0.12s;
  z-index: 20;
}
.poly:hover .poly-tip,
.poly:focus-within .poly-tip,
.poly:focus-visible .poly-tip {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.poly-tip::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: var(--border);
}

.poly-tip-head {
  font-family: var(--serif);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  padding: 2px 6px 4px;
}

.poly-opt {
  font: inherit;
  font-family: var(--mono);
  font-size: 0.95rem;
  text-align: left;
  padding: 4px 8px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.poly-opt:hover { background: var(--surface-2); }
.poly-opt.is-selected {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* ---------- buttons ---------- */

.switch {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.82rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.switch input { accent-color: var(--accent); }

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

.btn {
  font: inherit;
  font-size: 0.85rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, opacity 0.12s;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: 0.6; cursor: default; }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover { background: var(--accent); filter: brightness(1.05); }

.link-btn {
  font: inherit;
  font-size: 0.8rem;
  background: none;
  border: 0;
  color: var(--accent);
  cursor: pointer;
  padding: 2px 4px;
}
.link-btn:hover { text-decoration: underline; }

/* ---------- saved ---------- */

.saved { margin-top: 40px; }
.saved-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.saved-head h2 { margin: 0; font-size: 1.05rem; }
.saved-empty { color: var(--text-dim); font-size: 0.9rem; }

.saved-list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }

.saved-item {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  overflow: hidden;
}

.saved-load {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) auto;
  gap: 12px;
  align-items: center;
  text-align: left;
  font: inherit;
  padding: 10px 12px;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
}
.saved-load:hover { background: var(--surface-2); }
.saved-src { font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.saved-out {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.saved-meta {
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
}

.saved-del {
  flex: 0 0 auto;
  width: 40px;
  border: 0;
  border-left: 1px solid var(--border);
  background: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
}
.saved-del:hover { background: var(--surface-2); color: var(--danger); }

/* ---------- footer ---------- */

.site-foot {
  margin-top: 48px;
  color: var(--text-dim);
  font-size: 0.8rem;
}
.site-foot a { color: var(--accent); }

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .wrap { padding: 24px 14px 48px; }
  .translator { grid-template-columns: 1fr; }
  .pane { min-height: 200px; }
  .saved-load { grid-template-columns: 1fr auto; }
  .saved-out { display: none; }
}