:root {
  --qq-blue: #0a75c9;
  --qq-blue-deep: #075a9d;
  --qq-sky: #8fd4ff;
  --qq-pale: #eaf7ff;
  --qq-ice: #f4fbff;
  --ink: #1d2733;
  --muted: #5b6b79;
  --line: #9dc8e4;
  --line-soft: #c9e4f4;
  --pink: #ff4fa3;
  --lime: #76bc20;
  --paper: #fffdf0;
  --paper-line: #d9dfbb;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --window-shadow: 0 24px 70px rgba(5, 52, 87, .28), 0 2px 7px rgba(5, 52, 87, .25);
  --ui: Tahoma, Verdana, "Microsoft YaHei", sans-serif;
  --chat: Tahoma, "SimSun", "宋体", sans-serif;
}

* { box-sizing: border-box; }
html { min-height: 100%; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: var(--ui);
  background:
    radial-gradient(circle at 18% 14%, rgba(255,255,255,.95) 0 2%, transparent 22%),
    linear-gradient(180deg, #dff4ff 0%, #a8dcf7 49%, #6fbce7 100%);
  background-attachment: fixed;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(117deg, transparent 0 65%, rgba(255,255,255,.24) 65.1% 66%, transparent 66.1%),
    radial-gradient(ellipse at 75% 10%, rgba(255,255,255,.65), transparent 28%);
}
button, textarea, input { font: inherit; }
button { color: inherit; }

.home-teleport {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 50;
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 0 13px;
  border: 1px solid #78b8d8;
  border-radius: 999px;
  color: var(--qq-blue-deep);
  background: rgba(246, 252, 255, .94);
  box-shadow: 0 10px 26px rgba(5, 76, 120, .18);
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: color 140ms ease, background-color 140ms ease, border-color 140ms ease, transform 140ms var(--ease-out);
}
.home-teleport:hover {
  border-color: #0878bd;
  color: #fff;
  background: var(--qq-blue);
  transform: translateY(-1px);
}
.home-teleport:focus-visible {
  outline: 3px solid #ffbf3f;
  outline-offset: 3px;
}

.desktop-grain {
  position: fixed;
  inset: 0;
  opacity: .14;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(255,255,255,.35) 0 1px, transparent 1px 4px);
}
.page-shell {
  position: relative;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 74px 0 28px;
}
.site-intro { margin: 0 0 14px 8px; }
.year-stamp {
  margin: 0 0 3px;
  color: var(--qq-blue-deep);
  font: 700 11px/1.2 Verdana, sans-serif;
  letter-spacing: .17em;
}
.site-intro h1 {
  margin: 0;
  font-family: "STHupo", "华文琥珀", "SimHei", sans-serif;
  font-size: clamp(31px, 4vw, 48px);
  font-weight: 900;
  letter-spacing: -.04em;
  text-shadow: 0 2px #fff, 2px 3px 0 rgba(10,117,201,.22);
}
.site-intro h1 span { color: var(--pink); }

.qq-window {
  overflow: hidden;
  border: 1px solid #2c8bc9;
  border-radius: 9px 9px 5px 5px;
  background: #fff;
  box-shadow: var(--window-shadow);
}
.qq-titlebar {
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 8px 12px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(255,255,255,.18), transparent 38%),
    linear-gradient(180deg, #37a9ed 0%, #0876c8 52%, #0668b7 100%);
  border-bottom: 1px solid #05568f;
  text-shadow: 0 1px rgba(0,0,0,.35);
}
.qq-mark {
  width: 44px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 2px solid #fff;
  border-radius: 50% 50% 44% 44%;
  color: #fff;
  background: #151d29;
  box-shadow: 0 0 0 2px #f2b900, inset 0 -6px #f4f4f4;
  font: 900 21px/1 Verdana, sans-serif;
  transform: rotate(-4deg);
}
.qq-mark span { transform: rotate(4deg); }
.title-copy { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.title-copy strong { font-size: 15px; }
.title-copy span { opacity: .86; font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.window-actions { margin-left: auto; align-self: flex-start; display: flex; gap: 3px; }
.window-actions span {
  display: grid;
  place-items: center;
  width: 27px;
  height: 21px;
  border: 1px solid rgba(255,255,255,.48);
  border-radius: 2px;
  background: rgba(255,255,255,.12);
  font: 12px/1 Verdana, sans-serif;
}
.qq-toolbar {
  min-height: 31px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 13px;
  color: #35566d;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(#f9fdff, #d9effb);
  font-size: 12px;
}
.online-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 2px rgba(118,188,32,.2); }
.toolbar-separator { width: 1px; height: 14px; margin: 0 4px; background: var(--line); }
.toolbar-time { margin-left: auto; font-family: Verdana, sans-serif; }

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 282px;
  grid-template-rows: minmax(430px, 54vh) auto;
  background: var(--qq-pale);
}
.conversation-panel {
  min-width: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: #fff;
}
.output-area {
  --preview-font: var(--chat);
  --preview-size: 16px;
  --preview-color: #202830;
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 20px;
  background:
    linear-gradient(rgba(255,255,255,.94), rgba(255,255,255,.94)),
    repeating-linear-gradient(0deg, #d9effa 0 1px, transparent 1px 24px);
  scrollbar-color: var(--line) var(--qq-ice);
}
.output-area.mode-nickname { padding: 14px; background: #f7fcff; }
.output-area.mode-signature { padding: 0; background: #fff; }
.output-hint {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 12px;
  border-top: 1px solid #a8d1ea;
  background: linear-gradient(#f8fdff, #e5f5fd);
  color: #618097;
  font-size: 11px;
}
.empty-state { min-height: 100%; display: flex; align-items: center; justify-content: center; gap: 14px; color: #7893a3; }
.empty-state[hidden] { display: none; }
.empty-avatar {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--pink), #9249dc);
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.65), 0 4px 12px rgba(117,55,146,.24);
  font: 900 27px/1 "SimHei", sans-serif;
}
.empty-state strong { color: #537487; font-size: 14px; }
.empty-state p { margin: 5px 0 0; font-size: 12px; }

/* A chat log, not a stack of modern app bubbles. */
.chat-thread { display: flex; flex-direction: column; gap: 16px; }
.message-pair { display: grid; gap: 13px; padding-bottom: 16px; border-bottom: 1px dotted #c5dbe8; }
.message-pair:last-child { border-bottom: 0; }
.chat-message { max-width: 83%; font-family: var(--preview-font, var(--chat)); }
.chat-message.is-source { justify-self: end; text-align: right; }
.chat-message.is-translated { justify-self: start; }
.message-meta { margin-bottom: 5px; color: #1870ad; font: 11px/1.3 var(--ui); }
.is-source .message-meta { color: #7292a4; }
.chat-message p { margin: 0; color: var(--preview-color); white-space: pre-wrap; overflow-wrap: anywhere; font-size: var(--preview-size); line-height: 1.65; }
.is-source > p {
  padding: 7px 10px;
  border: 1px solid #c8dbe6;
  border-radius: 7px 2px 7px 7px;
  color: #3b4b55;
  background: #f3f8fb;
}
.translated-body {
  display: flex;
  align-items: end;
  flex-wrap: wrap;
  gap: 7px;
  padding-left: 10px;
  border-left: 3px solid #78bde8;
}
.translated-body p { color: var(--preview-color); }
.copy-icon-button {
  width: 29px;
  height: 28px;
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid #99c8e4;
  border-radius: 3px;
  color: #276c96;
  background: linear-gradient(#fff, #e7f5fc);
  cursor: pointer;
  transition: transform 120ms var(--ease-out), border-color 120ms ease, background-color 120ms ease;
}
.copy-icon-button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.copy-icon-button[hidden] { display: none; }
.copy-icon-button:hover { border-color: #2a8fc9; color: #0873b9; background: #fff; }
.copy-icon-button:active { transform: translateY(1px); }
.inline-copy { width: 26px; height: 25px; }
.pair-enter { animation: pair-in 300ms var(--ease-out) both; }
@keyframes pair-in { from { opacity: 0; transform: translateY(7px); } to { opacity: 1; transform: none; } }

.signature-preview { min-height: 100%; display: grid; grid-template-rows: 37px 1fr; }
.signature-preview h3 {
  margin: 0;
  padding: 8px 12px;
  border-bottom: 1px solid #aed5ed;
  color: #2f7098;
  background: linear-gradient(#fafdff, #e9f7fe);
  font-size: 14px;
  font-weight: 400;
}
.signature-stage { display: grid; place-items: center; padding: 30px 20px; }
.signature-result {
  width: 100%;
  padding: 38px 24px;
  border: 1px dashed #df8cb7;
  border-radius: 2px;
  text-align: center;
  background: linear-gradient(135deg, #fff7fc, #f1f8ff);
}
.signature-label { display: block; margin-bottom: 15px; color: #a05b83; font: 10px/1 Verdana, sans-serif; letter-spacing: .16em; }
.signature-result p { margin: 0; color: var(--preview-color); font-family: var(--preview-font); font-size: clamp(var(--preview-size), 2.5vw, 26px); line-height: 1.75; overflow-wrap: anywhere; }

.nickname-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.nickname-result {
  min-width: 0;
  min-height: 58px;
  display: grid;
  grid-template-columns: 31px minmax(0, 1fr) 28px;
  align-items: stretch;
  padding: 0;
  border: 1px solid #b7d8eb;
  border-radius: 4px;
  color: #1f3442;
  background: linear-gradient(110deg, #fff, #edf8ff);
  cursor: pointer;
  text-align: left;
  box-shadow: 0 1px 0 #fff inset;
  transition: transform 120ms var(--ease-out), border-color 120ms ease;
}
.nickname-result:hover { border-color: var(--pink); background: #fff7fc; }
.nickname-result:active { transform: translateY(1px); }
.candidate-number { display: grid; place-items: center; color: #63899f; border-right: 1px solid #d5e9f4; font: 10px/1 Verdana, sans-serif; }
.candidate-value { min-width: 0; align-self: center; padding: 9px; color: var(--preview-color); font-family: var(--preview-font); font-size: var(--preview-size); line-height: 1.35; overflow-wrap: anywhere; }
.candidate-copy-icon { display: grid; place-items: center; color: #5d98bb; }
.candidate-copy-icon svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.result-reveal { animation: result-in 260ms var(--ease-out) both; }
@keyframes result-in { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

/* QQ 2006 compact service panel */
.settings-panel { min-width: 0; padding: 9px; overflow: auto; background: linear-gradient(180deg, #dff5ff, #c6e9fa); }
.settings-title { margin: 0 0 6px; color: #276785; font-size: 11px; }
.notebook-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-bottom: 9px; border: 1px solid #71b4dc; border-radius: 3px; overflow: hidden; }
.notebook-tab { min-width: 0; cursor: pointer; }
.notebook-tab input, .persona-card input { position: absolute; opacity: 0; pointer-events: none; }
.notebook-tab span { min-height: 34px; display: grid; place-items: center; padding: 3px 2px; border-right: 1px solid #9bcce7; color: #35647e; background: linear-gradient(#f7fdff, #d9eef9); font-size: 10px; }
.notebook-tab:last-child span { border-right: 0; }
.notebook-tab input:checked + span { color: #fff; background: linear-gradient(#44b2eb, #087ac5); box-shadow: inset 0 1px rgba(255,255,255,.45); font-weight: 700; text-shadow: 0 1px #07558b; }
.notebook-page { min-height: 0; border: 1px solid #89c2e2; border-radius: 2px; background: rgba(244,251,255,.8); box-shadow: inset 0 1px #fff; }
.control-group { margin: 0; padding: 0 7px 10px; border: 0; }
.control-group[hidden] { display: none; }
.control-group legend { width: calc(100% + 14px); margin: 0 -7px 6px; padding: 5px 7px; border-top: 1px solid #fff; border-bottom: 1px solid #91c8e6; color: #255d7e; background: linear-gradient(#f5fcff, #cae9f8); font-size: 11px; font-weight: 700; }
.persona-list { display: grid; gap: 4px; }
.persona-card { display: block; cursor: pointer; }
.persona-card > span { position: relative; display: flex; flex-direction: column; gap: 1px; min-height: 42px; justify-content: center; padding: 5px 7px 5px 33px; border: 1px solid #aed4e8; border-radius: 2px; background: rgba(255,255,255,.73); }
.persona-card > span::before { content: ""; position: absolute; left: 10px; width: 11px; height: 11px; border: 2px solid #87b8d2; border-radius: 50%; background: #fff; }
.persona-card input:checked + span { border-color: #188ed0; background: #fff; box-shadow: inset 3px 0 #1387c8; }
.persona-card input:checked + span::before { border-color: #1686c5; box-shadow: inset 0 0 0 3px #fff; background: #1686c5; }
.persona-card b { color: #315d75; font-size: 11px; }
.persona-card small { color: #7690a0; font-size: 9px; }
.intensity-group { padding-bottom: 12px; }
.signal-slider { position: relative; width: 132px; height: 50px; margin: 2px auto 0; }
.signal-meter { position: absolute; inset: 0 8px 8px; display: flex; align-items: end; gap: 4px; pointer-events: none; }
.signal-meter i { width: 16px; border: 1px solid #78b8d8; background: #d8eef8; box-shadow: inset 0 1px #fff; transition: background 120ms ease, border-color 120ms ease; }
.signal-meter i:nth-child(1) { height: 10px; }.signal-meter i:nth-child(2) { height: 17px; }.signal-meter i:nth-child(3) { height: 24px; }.signal-meter i:nth-child(4) { height: 31px; }.signal-meter i:nth-child(5) { height: 38px; }
.signal-meter[data-level="0"] i:nth-child(-n+2),
.signal-meter[data-level="1"] i:nth-child(-n+4),
.signal-meter[data-level="2"] i { border-color: #1688c8; background: linear-gradient(#59c0ee, #1688ca); }
.signal-meter[data-level="2"] i:last-child { border-color: #e1328c; background: linear-gradient(#ff72ba, #e83b96); }
#intensity-range { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: .001; cursor: ew-resize; }
#intensity-range:focus-visible + * { outline: none; }
.signal-slider:focus-within { outline: 3px solid #ffbf3f; outline-offset: 3px; }

.composer { grid-column: 1 / -1; border-top: 1px solid #79b7dc; background: #f7fcff; }
.editor-toolbar {
  position: relative;
  min-height: 35px;
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 10px;
  border-bottom: 1px solid #b5d9ec;
  background: linear-gradient(#f9fdff, #def1fa);
}
.editor-tool { width: 29px; height: 27px; display: grid; place-items: center; padding: 0; border: 1px solid transparent; border-radius: 2px; color: #39718f; background: transparent; cursor: pointer; font-size: 15px; }
.editor-tool:hover, .editor-tool[aria-expanded="true"] { border-color: #8dc3df; background: linear-gradient(#fff, #d8eef9); }
.font-tool { color: #e63c4d; font-family: Georgia, serif; font-weight: 700; text-decoration: underline; text-decoration-thickness: 2px; }
.tool-panel { position: absolute; left: 8px; top: calc(100% + 2px); z-index: 12; min-width: 210px; padding: 9px; border: 1px solid #3c91c1; border-radius: 3px; color: #345c72; background: #f5fbff; box-shadow: 0 8px 20px rgba(12,72,108,.25), inset 0 1px #fff; font-size: 11px; }
.tool-panel[hidden] { display: none; }
.appearance-panel { display: grid; grid-template-columns: 1fr 74px; gap: 8px; }
.appearance-panel label { display: grid; gap: 3px; }
.appearance-panel select { min-height: 28px; border: 1px solid #91c2dc; color: #345c72; background: #fff; font-size: 12px; }
.color-picker { grid-column: 1 / -1; display: flex; gap: 7px; padding-top: 2px; }
.color-picker button { width: 24px; height: 22px; padding: 3px; border: 1px solid #96b9cc; border-radius: 2px; background: #fff; cursor: pointer; }
.color-picker button::before { content: ""; display: block; width: 100%; height: 100%; background: var(--swatch); }
.color-picker button[aria-pressed="true"] { border-color: #ff9b1a; box-shadow: 0 0 0 1px #ffcf72; }
.insert-grid { grid-template-columns: repeat(3, minmax(54px, auto)); gap: 5px; }
.insert-grid:not([hidden]) { display: grid; }
.insert-grid button, .music-panel button { min-height: 29px; padding: 4px 7px; border: 1px solid #b1d3e6; border-radius: 2px; color: #365f76; background: #fff; cursor: pointer; }
.insert-grid button:hover, .music-panel button:hover { border-color: #278fc8; background: #e8f7ff; }
.music-panel { width: 235px; }
.music-panel:not([hidden]) { display: grid; gap: 5px; }
.music-panel button { text-align: left; }
#source-text {
  --preview-font: var(--chat);
  --preview-size: 16px;
  --preview-color: #202830;
  display: block;
  width: 100%;
  min-height: 112px;
  resize: vertical;
  padding: 13px 15px;
  border: 0;
  outline: 0;
  color: var(--preview-color);
  background: #fff;
  font-family: var(--preview-font);
  font-size: var(--preview-size);
  line-height: 1.6;
}
#source-text::placeholder { color: #9bb0bc; }
#source-text:focus { box-shadow: inset 0 0 0 2px rgba(10,117,201,.28); }
.composer-footer {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border-top: 1px solid #c9e1ee;
  background: #edf8fd;
}
.char-count { color: #708c9c; font: 10px/1 Verdana, sans-serif; }
.secondary-actions { margin-left: auto; display: flex; gap: 6px; }
.text-button {
  min-height: 31px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: #426c83;
  background: linear-gradient(#fff, #e6f3fa);
  cursor: pointer;
}
.send-button {
  min-width: 112px;
  min-height: 33px;
  padding: 0 17px;
  border: 1px solid #0865a4;
  border-radius: 3px;
  color: #fff;
  background: linear-gradient(#43ade9, #0873bd);
  box-shadow: inset 0 1px rgba(255,255,255,.35), 0 1px 2px rgba(0,62,103,.22);
  font-weight: 700;
  cursor: pointer;
  text-shadow: 0 1px rgba(0,0,0,.28);
}
.send-button:hover { background: linear-gradient(#58b9ee, #0b83d3); }
.send-button:active { transform: translateY(1px); }

button:focus-visible,
.notebook-tab input:focus-visible + span,
.persona-card input:focus-visible + span { outline: 3px solid #ffbf3f; outline-offset: 2px; }
.site-footer { display: flex; justify-content: center; gap: 7px; margin-top: 15px; color: #3f718e; font-size: 11px; }
.site-footer span { opacity: .65; }
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 10;
  transform: translate(-50%, 12px);
  max-width: calc(100% - 28px);
  padding: 10px 17px;
  border: 1px solid #075f9b;
  border-radius: 4px;
  color: #fff;
  background: rgba(4,78,128,.95);
  box-shadow: 0 8px 25px rgba(0,42,72,.25);
  font: 13px/1.3 var(--chat);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms var(--ease-out);
}
.toast.is-error { border-color: #9e3c3c; background: rgba(137,41,41,.95); font-family: var(--ui); }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 780px) {
  .page-shell { width: min(100% - 16px, 620px); padding-top: 72px; }
  .site-intro { margin-left: 3px; }
  .workspace { grid-template-columns: 1fr; grid-template-rows: minmax(370px, 51vh) auto auto; }
  .conversation-panel { border-right: 0; }
  .settings-panel { border-top: 1px solid var(--line); overflow: visible; }
  .notebook-page { min-height: 0; }
  .persona-list { grid-template-columns: 1fr 1fr; }
  .composer { grid-column: 1; }
  .nickname-grid { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .page-shell { width: 100%; padding: 0; }
  .site-intro { padding: 72px 14px 9px; margin: 0; }
  .qq-window { border-radius: 0; border-left: 0; border-right: 0; }
  .window-actions { display: none; }
  .workspace { grid-template-rows: minmax(350px, 49vh) auto auto; }
  .output-area { padding: 14px; }
  .chat-message { max-width: 92%; }
  .settings-panel { padding: 11px 8px; }
  .notebook-page { padding-right: 11px; }
  .persona-list { grid-template-columns: 1fr; }
  .tool-panel { width: min(300px, calc(100vw - 28px)); min-width: 0; }
  .composer-footer { flex-wrap: wrap; }
  .char-count { order: 3; width: 100%; }
  .secondary-actions { margin-left: 0; }
  .send-button { margin-left: auto; }
  .site-footer { padding-bottom: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}