:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #16181c;
  --ink-soft: #5f6670;
  --muted: #878d96;
  --line: #e6e8ec;
  --accent: #c9411a;
  --page-x: clamp(16px, 5.5vw, 26px);
  --top-bar-height: max(64px, calc(env(safe-area-inset-top) + 52px));
  --captions-top: max(76px, calc(env(safe-area-inset-top) + 64px));
  --console-base: clamp(148px, 19dvh, 168px);
  --console-height: calc(var(--console-base) + env(safe-area-inset-bottom));
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-height: 100dvh;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

button,
textarea,
input,
select {
  font: inherit;
}

button {
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.translate-app {
  min-height: 100dvh;
  background: var(--bg);
}

.translate-surface {
  position: relative;
  height: calc(100dvh - var(--console-height));
  min-height: 0;
  padding: var(--captions-top) var(--page-x) 20px;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.language-bar {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  display: grid;
  grid-template-columns: 42px minmax(0, 1.05fr) 36px minmax(0, 1.15fr);
  gap: 6px;
  align-items: center;
  min-height: var(--top-bar-height);
  padding: env(safe-area-inset-top) 12px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.nav-button,
.menu-button,
.swap-button,
.language-button,
.language-select {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 42px;
  margin: 0;
  background: transparent;
  color: var(--ink);
  font-weight: 600;
}

.nav-button,
.menu-button,
.swap-button {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--ink-soft);
}

.back-button {
  font-size: 2.6rem;
  font-weight: 300;
  transform: translateY(-2px);
}

.swap-button {
  font-size: 1.35rem;
}

.menu-button {
  display: none;
}

.language-button,
.language-select {
  padding: 0 18px 0 4px;
  border-radius: 8px;
  font-size: clamp(1rem, 4.2vw, 1.18rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-align: center;
}

.language-select {
  width: 100%;
  border: 0;
  outline: 0;
  appearance: none;
  -webkit-appearance: none;
  background:
    linear-gradient(45deg, transparent 50%, #9aa0a8 50%) calc(100% - 10px) 54% / 4px 4px no-repeat,
    linear-gradient(135deg, #9aa0a8 50%, transparent 50%) calc(100% - 6px) 54% / 4px 4px no-repeat;
  white-space: nowrap;
  text-align-last: center;
}

.language-button:active,
.language-select:active,
.swap-button:active,
.nav-button:active,
.menu-button:active {
  background: rgba(22, 24, 28, 0.05);
}

.listening-prompt {
  position: absolute;
  inset: var(--captions-top) var(--page-x) 24px;
  display: none;
  align-content: start;
  padding-top: 9dvh;
  text-align: left;
}

body.running:not(.has-captions):not(.text-mode) .listening-prompt {
  display: grid;
  gap: 10px;
}

.listening-prompt p {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.1rem, 8vw, 3.4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.listening-prompt span {
  display: block;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 4vw, 1.2rem);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0;
}

.mode-chooser {
  position: absolute;
  inset: var(--captions-top) var(--page-x) 24px;
  display: none;
  align-content: center;
  gap: 12px;
  width: min(460px, calc(100% - var(--page-x) * 2));
  margin: 0 auto;
  left: 50%;
  transform: translateX(-50%);
}

body.choose-mode .mode-chooser {
  display: grid;
}

body.choose-mode .bottom-console {
  visibility: hidden;
}

.mode-chooser-title {
  margin: 0 0 6px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.mode-card {
  display: grid;
  gap: 6px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  text-align: left;
  transition: border-color 0.15s ease, transform 0.12s ease;
}

.mode-card:active {
  border-color: var(--ink);
  transform: scale(0.99);
}

.mode-card strong {
  color: var(--ink);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mode-card span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 400;
}

.text-prompt {
  position: absolute;
  inset: var(--captions-top) var(--page-x) 24px;
  display: none;
  align-content: start;
  padding-top: 9dvh;
  text-align: left;
  gap: 10px;
}

body.text-mode:not(.has-captions):not(.choose-mode) .text-prompt {
  display: grid;
}

.text-prompt p {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.1rem, 8vw, 3.4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-prompt span {
  display: block;
  color: var(--muted);
  font-size: clamp(1rem, 4vw, 1.2rem);
  font-weight: 400;
  line-height: 1.4;
}

.captions {
  position: absolute;
  left: var(--page-x);
  right: var(--page-x);
  top: var(--captions-top);
  bottom: 18px;
  display: none;
  grid-template-rows: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 0;
  padding: 0;
}

body.has-captions .captions {
  display: grid;
}

.caption-block {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  min-height: 0;
  overflow: hidden;
  padding: 18px 0 16px;
}

.caption-label {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: clamp(0.68rem, 2.9vw, 0.78rem);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.caption-text {
  display: grid;
  gap: 0.55em;
  min-height: 0;
  overflow-y: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 1.1em);
  mask-image: linear-gradient(to bottom, transparent 0, #000 1.1em);
}

.caption-text::-webkit-scrollbar {
  width: 3px;
}

.caption-text::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(22, 24, 28, 0.18);
}

.caption-line {
  display: block;
}

.caption-text.source,
.caption-text.translation {
  align-content: end;
  font-size: clamp(1.42rem, 6.4vw, 2.5rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.caption-text.source {
  color: var(--ink-soft);
  font-weight: 400;
}

.caption-text.translation {
  color: var(--ink);
  font-weight: 600;
}

.caption-text.empty {
  display: none;
}

.divider {
  display: block;
  height: 1px;
  background: var(--line);
}

.bottom-console {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 10px;
  height: var(--console-height);
  padding: 8px var(--page-x) max(10px, env(safe-area-inset-bottom));
  background: var(--surface);
  text-align: center;
}

.mode-switch {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
}

.mode-option {
  padding: 6px 16px;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mode-option.active {
  background: var(--ink);
  color: #ffffff;
}

.bottom-status {
  display: inline-grid;
  grid-auto-flow: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 16px;
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

body.running .bottom-status {
  color: var(--accent);
}

body.running .bottom-status::before {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
  content: "";
  animation: live-pulse 1.6s ease-in-out infinite;
}

@keyframes live-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.bottom-actions {
  display: flex;
  justify-content: center;
  width: min(710px, 100%);
  margin: 0 auto;
}

.mic-button {
  min-height: 58px;
  border-radius: 999px;
  font-size: clamp(1rem, 4.2vw, 1.2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mic-button {
  position: relative;
  display: grid;
  place-items: center;
  width: 132px;
  background: var(--ink);
  color: transparent;
  font-size: 0;
  box-shadow: 0 1px 2px rgba(22, 24, 28, 0.12);
  transition: background-color 0.2s ease, transform 0.12s ease;
}

.mic-button:active {
  transform: scale(0.97);
}

.mic-button::before {
  width: 16px;
  height: 26px;
  border: 3.5px solid #ffffff;
  border-radius: 999px;
  content: "";
}

.mic-button::after {
  position: absolute;
  width: 28px;
  height: 15px;
  margin-top: 26px;
  border: 3.5px solid #ffffff;
  border-top: 0;
  border-radius: 0 0 16px 16px;
  content: "";
}

body.running .mic-button {
  background: var(--accent);
  box-shadow: 0 1px 2px rgba(201, 65, 26, 0.24);
}

body.running .mic-button::before,
body.running .mic-button::after {
  position: static;
  width: 9px;
  height: 26px;
  margin: 0 4px;
  border: 0;
  border-radius: 1.5px;
  background: #ffffff;
  content: "";
}

body.running .mic-button {
  display: flex;
  align-items: center;
  justify-content: center;
}

.mic-button:disabled {
  opacity: 0.4;
}

.hidden-ui {
  display: none !important;
}

@media (max-width: 420px) {
  :root {
    --page-x: 18px;
  }

  .language-bar {
    grid-template-columns: 34px minmax(0, 1fr) 30px minmax(0, 1.1fr);
    gap: 4px;
    padding-right: 9px;
    padding-left: 9px;
  }

  .back-button {
    font-size: 2.3rem;
  }

  .language-button,
  .language-select {
    min-height: 40px;
    padding-right: 14px;
    font-size: clamp(0.94rem, 4.4vw, 1.08rem);
  }
}

@media (max-height: 740px) {
  :root {
    --top-bar-height: max(58px, calc(env(safe-area-inset-top) + 46px));
    --captions-top: max(66px, calc(env(safe-area-inset-top) + 54px));
    --console-base: 96px;
  }

  .caption-block {
    gap: 8px;
    padding: 12px 0 10px;
  }

  .caption-text.source,
  .caption-text.translation {
    font-size: clamp(1.18rem, 5.8vw, 1.9rem);
  }

  .mic-button {
    width: 120px;
    min-height: 52px;
  }
}

@media (max-height: 640px) {
  :root {
    --console-base: 84px;
  }

  .bottom-status {
    display: none;
  }

  .mic-button {
    width: 108px;
    min-height: 48px;
  }
}

@media (min-width: 720px) {
  .language-bar {
    padding-inline: max(12px, calc(50vw - 450px));
  }

  .captions,
  .listening-prompt,
  .text-prompt {
    max-width: 860px;
    margin: 0 auto;
    left: 50%;
    right: auto;
    width: min(860px, calc(100% - var(--page-x) * 2));
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}