/*
 * Mobile-first UI for Video Translator App (VT-NET-32).
 * Port of src/client/style.css: dark theme, 48px touch targets, safe-area
 * insets, 100dvh, full-screen remote video + PiP local video.
 */

:root {
  --touch-min: 48px;
  --control-padding-y: 0.875rem;
  --control-padding-x: 1.25rem;
  --control-font-size: 1rem;

  --content-max-width: 480px;
  --content-padding: 1rem;

  --bg: #121212;
  --bg-elevated: #1e1e1e;
  --surface: #2a2a2a;
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --accent: #4a9eff;
  --accent-hover: #6bb0ff;
  --danger: #ff5252;
  --border-subtle: rgba(255, 255, 255, 0.12);

  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

#app {
  height: 100%;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  padding: var(--control-padding-y) var(--control-padding-x);
  font-size: var(--control-font-size);
  font-family: inherit;
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  background: var(--surface);
  color: var(--text-primary);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  width: 100%;
  box-sizing: border-box;
}

.btn:active {
  background: var(--bg-elevated);
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:active {
  background: var(--accent-hover);
}

/* ── Setup ── */
.setup {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding:
    calc(var(--content-padding) + var(--safe-top))
    calc(var(--content-padding) + var(--safe-left))
    calc(var(--content-padding) + var(--safe-bottom))
    calc(var(--content-padding) + var(--safe-right));
  box-sizing: border-box;
}

.setup h1 {
  font-size: 1.75rem;
  margin: 0 0 1.5rem;
  text-align: center;
}

.setup form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  max-width: var(--content-max-width);
}

.lang-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lang-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  min-height: var(--touch-min);
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
}

.lang-card__label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.lang-select {
  width: 100%;
  min-height: var(--touch-min);
  font-size: 1.125rem;
  font-family: inherit;
  background: transparent;
  color: var(--text-primary);
  border: none;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  padding-right: 2rem;
  cursor: pointer;
}

.lang-card::after {
  content: '▾';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 1rem;
  pointer-events: none;
}

.join-section {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.room-input-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.room-input {
  width: 100%;
  min-height: var(--touch-min);
  font-size: 1.5rem;
  font-family: monospace;
  letter-spacing: 0.3em;
  text-align: center;
  text-transform: uppercase;
  padding: 0.75rem;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  box-sizing: border-box;
}

.room-input:focus {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  margin: 0.25rem 0;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-subtle);
}

.divider span {
  padding: 0 0.75rem;
}

.setup .error {
  color: var(--danger);
  margin-top: 0.5rem;
  font-size: 0.9rem;
  text-align: center;
  max-width: var(--content-max-width);
}

/* ── Call ── */
.call {
  position: relative;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  background: #000;
}

.remote-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
  z-index: 1;
}

.local-video {
  position: absolute;
  top: calc(0.75rem + var(--safe-top));
  right: calc(0.75rem + var(--safe-right));
  width: 120px;
  height: 160px;
  object-fit: cover;
  border-radius: 0.75rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  background: #1a1a1a;
  z-index: 5;
}

@media (min-width: 768px) {
  .local-video {
    width: 180px;
    height: 240px;
  }
}

@media (max-width: 360px) {
  .local-video {
    width: 96px;
    height: 128px;
  }
}

.call-controls {
  position: absolute;
  bottom: calc(1rem + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.75rem;
  z-index: 10;
  padding: 0.5rem;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.call-control-btn {
  width: auto;
  min-width: 72px;
  min-height: 52px;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  border-radius: 2rem;
}

.call-control-btn:active {
  background: rgba(255, 255, 255, 0.3);
}

/* ── Call diagnostics panel ── */
.call-diagnostics {
  position: absolute;
  top: calc(0.75rem + var(--safe-top));
  left: calc(0.75rem + var(--safe-left));
  z-index: 15;
  max-width: min(78vw, 20rem);
  max-height: 70dvh;
  overflow-y: auto;
  font-family: system-ui, sans-serif;
  font-size: 0.75rem;
  color: #e0e0e0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
}

.call-diagnostics summary {
  cursor: pointer;
  font-weight: 600;
  color: #fff;
  user-select: none;
}

.call-diagnostics dl {
  margin: 0.375rem 0 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.125rem 0.75rem;
}

.call-diagnostics dt {
  color: rgba(255, 255, 255, 0.55);
  white-space: nowrap;
}

.call-diagnostics dd {
  margin: 0;
  word-break: break-word;
}

/* ── Caption overlay ── */
.caption-overlay {
  position: absolute;
  bottom: 6rem;
  left: 0.75rem;
  right: 0.75rem;
  pointer-events: none;
  text-align: center;
  color: #fff;
  text-shadow: 0 0 2px rgba(0, 0, 0, 0.9), 0 1px 3px rgba(0, 0, 0, 0.8);
  font-family: system-ui, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.4;
  z-index: 8;
}

.caption-overlay p {
  margin: 0.25rem 0;
  padding: 0.5rem 0.875rem;
  border-radius: 0.5rem;
  background: rgba(0, 0, 0, 0.6);
  display: inline-block;
  max-width: 90%;
}

.caption-draft {
  font-style: italic;
  opacity: 0.85;
}

.caption-final {
  font-weight: 500;
  opacity: 1;
}

/* ── Error / call-ended ── */
.error-screen,
.call-ended-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding:
    calc(var(--content-padding) + var(--safe-top))
    calc(var(--content-padding) + var(--safe-left))
    calc(var(--content-padding) + var(--safe-bottom))
    calc(var(--content-padding) + var(--safe-right));
  text-align: center;
  box-sizing: border-box;
  gap: 1rem;
}

.error-screen h2,
.call-ended-screen h2 {
  color: var(--danger);
  font-size: 1.5rem;
  margin: 0;
}

.error-screen p,
.call-ended-screen p {
  color: var(--text-secondary);
  max-width: var(--content-max-width);
  margin: 0;
}

.error-screen button,
.call-ended-screen button {
  max-width: var(--content-max-width);
  margin-top: 0.5rem;
}

/* ── Waiting room ── */
.waiting {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding:
    calc(var(--content-padding) + var(--safe-top))
    calc(var(--content-padding) + var(--safe-left))
    calc(var(--content-padding) + var(--safe-bottom))
    calc(var(--content-padding) + var(--safe-right));
  text-align: center;
  box-sizing: border-box;
  gap: 0.625rem;
}

.waiting h2 {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
}

.waiting-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0.75rem 0 0;
}

.room-code {
  font-size: clamp(2.5rem, 12vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.25em;
  padding: 0.75rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  font-family: monospace;
  color: var(--text-primary);
  word-break: break-all;
}

.share-link {
  font-size: 0.875rem;
  color: var(--accent);
  word-break: break-all;
  max-width: 100%;
  width: 100%;
  padding: 0.625rem 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 0.5rem;
  box-sizing: border-box;
}

.copy-code-btn,
.copy-link-btn {
  margin-top: 0.5rem;
  max-width: var(--content-max-width);
}

.waiting-text {
  margin-top: 1.5rem;
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.9375rem;
}