:root {
  color-scheme: light;
  --paper: #f7f8f4;
  --paper-strong: #ffffff;
  --ink: #17211b;
  --ink-soft: #47534b;
  --ink-faint: #68736b;
  --line: #d9e0d9;
  --line-strong: #b8c4ba;
  --signal: #155eef;
  --signal-dark: #0c46ba;
  --signal-soft: #e8efff;
  --warning: #b83a0a;
  --warning-soft: #fff0e8;
  --danger: #c92a2a;
  --danger-soft: #fff0f0;
  --success: #147a4b;
  --shadow: 0 18px 45px rgb(23 33 27 / 10%);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--paper);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 64px;
}

button,
input {
  font: inherit;
  letter-spacing: 0;
}

button,
label,
input[type="range"] {
  touch-action: manipulation;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
label:focus-within {
  outline: 3px solid color-mix(in srgb, var(--signal) 70%, white);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.app-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  background: var(--paper);
  border-inline: 1px solid var(--line);
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  min-height: 64px;
  padding:
    max(10px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    10px
    max(16px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  width: fit-content;
  min-height: 44px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  width: 10px;
  height: 10px;
  background: var(--signal);
  box-shadow: 6px 6px 0 var(--warning);
}

.connection {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  color: var(--ink-soft);
  font-size: 13px;
  white-space: nowrap;
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-faint);
}

.connection[data-state="connected"] .connection-dot {
  background: var(--success);
  box-shadow: 0 0 0 4px rgb(20 122 75 / 12%);
}

.connection[data-state="connecting"] .connection-dot {
  background: var(--warning);
  animation: pulse 1.4s ease-in-out infinite;
}

.connection[data-state="error"] .connection-dot {
  background: var(--danger);
}

.code-button {
  display: grid;
  gap: 2px;
  min-width: 108px;
  min-height: 44px;
  padding: 5px 10px;
  color: var(--ink);
  text-align: right;
  border: 0;
  background: transparent;
}

.code-button:hover {
  background: var(--signal-soft);
}

.code-label {
  color: var(--ink-faint);
  font-size: 11px;
}

.code-button code {
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  min-height: calc(100vh - 65px);
}

.conversation-panel {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: calc(100vh - 65px);
  flex-direction: column;
  padding: 28px clamp(20px, 4vw, 52px) 36px;
}

.section-heading,
.control-heading,
.field-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.section-heading {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-strong);
}

.section-heading h1,
.control-heading h2,
.dialog-actions + h2,
dialog h2 {
  margin: 0;
  letter-spacing: 0;
}

.section-heading h1 {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
}

.section-heading p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.viewer-count {
  flex: none;
  padding: 5px 9px;
  color: var(--ink-soft);
  font-size: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper-strong);
}

.conversation {
  display: flex;
  flex: 1;
  min-height: 280px;
  max-height: calc(100vh - 210px);
  flex-direction: column;
  gap: 22px;
  overflow-y: auto;
  padding: 28px 2px 120px;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.empty-state {
  display: grid;
  gap: 8px;
  place-content: center;
  min-height: 240px;
  color: var(--ink-faint);
  text-align: center;
}

.empty-state strong {
  color: var(--ink-soft);
  font-size: 17px;
}

.empty-state span {
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.6;
}

.message {
  width: min(760px, 92%);
}

.message-head {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  color: var(--ink-faint);
  font-size: 12px;
}

.message-role {
  color: var(--ink-soft);
  font-weight: 700;
}

.message-content {
  margin: 0;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message.assistant {
  align-self: flex-start;
  padding-left: 16px;
  border-left: 3px solid var(--signal);
}

.message.assistant .message-content {
  font-size: 16px;
}

.message.interviewer {
  align-self: flex-end;
  padding-right: 16px;
  text-align: right;
  border-right: 3px solid var(--warning);
}

.message.notice,
.message.error {
  width: 100%;
  padding: 12px 14px;
  font-size: 13px;
  border: 1px solid var(--line-strong);
  background: var(--paper-strong);
}

.message.error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 35%, var(--line));
  background: var(--danger-soft);
}

.message-status {
  color: var(--signal);
}

.message.answer-complete .message-status {
  color: var(--success);
}

.jump-latest {
  position: sticky;
  z-index: 5;
  bottom: 18px;
  align-self: center;
  min-height: 44px;
  padding: 0 18px;
  color: white;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.pairing-form {
  width: min(520px, 100%);
  margin: auto;
  padding: 24px;
  border: 1px solid var(--line-strong);
  background: var(--paper-strong);
  box-shadow: var(--shadow);
}

.pairing-form[hidden] {
  display: none;
}

.pairing-form label {
  display: block;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 700;
}

.pairing-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.pairing-controls input {
  min-width: 0;
  min-height: 48px;
  padding: 0 14px;
  color: var(--ink);
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 18px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--paper);
}

.pairing-controls button {
  min-height: 48px;
  padding: 0 18px;
  color: white;
  border: 0;
  border-radius: 6px;
  background: var(--signal);
}

.pairing-form p {
  margin: 14px 0 0;
  color: var(--ink-faint);
  font-size: 12px;
  line-height: 1.6;
}

.control-rail {
  border-left: 1px solid var(--line-strong);
  background: var(--paper-strong);
}

.more-controls {
  display: none;
}

.control-section {
  padding: 24px;
  border-bottom: 1px solid var(--line);
}

.control-heading {
  align-items: baseline;
  margin-bottom: 16px;
}

.control-heading h2 {
  font-size: 17px;
}

.control-heading span {
  color: var(--ink-faint);
  font-size: 12px;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.action-button,
.upload-submit,
.end-button {
  min-height: 48px;
  padding: 10px 12px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--paper-strong);
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    transform 100ms ease;
}

.action-button:hover,
.upload-submit:hover:not(:disabled) {
  border-color: var(--signal);
  background: var(--signal-soft);
}

.action-button:active,
.upload-submit:active:not(:disabled),
.end-button:active {
  transform: translateY(1px);
}

.action-button.pending {
  color: var(--signal-dark);
  border-color: var(--signal);
  background: var(--signal-soft);
}

.action-primary {
  color: white;
  border-color: var(--signal);
  background: var(--signal);
}

.action-primary:hover {
  color: white;
  border-color: var(--signal-dark);
  background: var(--signal-dark);
}

.action-answer {
  grid-column: 1 / -1;
  color: var(--warning);
  border-color: color-mix(in srgb, var(--warning) 38%, var(--line));
  background: var(--warning-soft);
}

.opacity-control {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.field-heading {
  align-items: center;
  margin-bottom: 12px;
  color: var(--ink-soft);
  font-size: 13px;
}

.field-heading output {
  color: var(--ink);
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  height: 28px;
  accent-color: var(--signal);
}

.file-picker {
  display: grid;
  gap: 6px;
  min-height: 82px;
  padding: 16px;
  border: 1px dashed var(--line-strong);
  border-radius: 6px;
  background: var(--paper);
  cursor: pointer;
}

.file-picker:hover {
  border-color: var(--signal);
  background: var(--signal-soft);
}

.file-picker-title {
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

.file-picker span:last-child {
  color: var(--ink-faint);
  font-size: 12px;
  line-height: 1.5;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-top: 10px;
}

.preview-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.thinking-toggle {
  display: flex;
  gap: 10px;
  align-items: center;
  min-height: 44px;
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 13px;
}

.thinking-toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--signal);
}

.upload-submit {
  width: 100%;
  color: white;
  border-color: var(--ink);
  background: var(--ink);
}

.upload-status {
  min-height: 20px;
  margin: 10px 0 0;
  color: var(--ink-faint);
  font-size: 12px;
  line-height: 1.5;
}

.upload-status.error {
  color: var(--danger);
}

.session-section {
  border-bottom: 0;
}

.privacy-copy {
  margin: 0 0 16px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.65;
}

.end-button {
  width: 100%;
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 35%, var(--line));
  background: var(--danger-soft);
}

dialog {
  width: min(420px, calc(100vw - 32px));
  padding: 24px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper-strong);
  box-shadow: 0 28px 80px rgb(23 33 27 / 28%);
}

dialog::backdrop {
  background: rgb(23 33 27 / 46%);
  backdrop-filter: blur(3px);
}

dialog h2 {
  font-size: 21px;
}

dialog p {
  margin: 12px 0 22px;
  color: var(--ink-soft);
  line-height: 1.65;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.dialog-actions button {
  min-height: 48px;
  color: var(--ink);
  font-weight: 700;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--paper);
}

.dialog-actions .danger {
  color: white;
  border-color: var(--danger);
  background: var(--danger);
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.45;
  }

  50% {
    opacity: 1;
  }
}

@media (max-width: 900px) {
  .app-shell {
    border: 0;
  }

  .workspace {
    display: block;
    min-height: auto;
  }

  .conversation-panel {
    min-height: calc(100svh - 65px);
    padding-bottom: calc(420px + env(safe-area-inset-bottom));
  }

  .conversation {
    flex: none;
    max-height: none;
    min-height: 52vh;
    overflow: visible;
    padding-bottom: 40px;
  }

  .control-rail {
    position: fixed;
    z-index: 30;
    right: 0;
    bottom: 0;
    left: 0;
    max-height: 62svh;
    overflow-y: auto;
    border-top: 1px solid var(--line-strong);
    border-left: 0;
    box-shadow: 0 -18px 45px rgb(23 33 27 / 12%);
    padding-bottom: env(safe-area-inset-bottom);
    overscroll-behavior: contain;
  }

  .more-controls {
    position: sticky;
    z-index: 2;
    top: 0;
    display: flex;
    width: 100%;
    min-height: 48px;
    gap: 8px;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    color: var(--ink-soft);
    font-size: 13px;
    font-weight: 700;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--paper-strong) 96%, transparent);
    backdrop-filter: blur(12px);
  }

  .more-controls svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2;
    transition: transform 160ms ease;
  }

  .control-rail.expanded .more-controls svg {
    transform: rotate(180deg);
  }

  .control-section {
    padding: 18px max(16px, env(safe-area-inset-right)) 18px max(16px, env(safe-area-inset-left));
  }

  .upload-section,
  .session-section {
    display: none;
  }

  .control-rail.expanded .upload-section,
  .control-rail.expanded .session-section {
    display: block;
  }

  .action-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .action-button {
    min-width: 0;
    padding-inline: 8px;
    font-size: 13px;
  }

  .action-answer {
    grid-column: span 2;
  }

  .opacity-control {
    margin-top: 14px;
    padding-top: 12px;
  }

  .jump-latest {
    position: fixed;
    right: 16px;
    bottom: calc(62svh + 14px);
  }
}

@media (max-width: 600px) {
  .topbar {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .brand {
    font-size: 15px;
  }

  .connection {
    justify-self: end;
    padding: 0 4px;
  }

  .code-button {
    display: none;
  }

  .conversation-panel {
    padding: 20px 16px calc(390px + env(safe-area-inset-bottom));
  }

  .section-heading h1 {
    font-size: 25px;
  }

  .viewer-count {
    display: none;
  }

  .message {
    width: 100%;
  }

  .action-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .action-answer {
    grid-column: span 2;
  }

  .pairing-controls {
    grid-template-columns: 1fr;
  }
}

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