/* ============================================================
   陈绍华先生 · AI 数字人 · 展厅界面（雅致纪念版）
   水墨东方 + 暖金点缀 + 米白文字，庄重而温润
   ============================================================ */
:root {
  --bg-0: #08130f;
  --bg-1: #0e1f19;
  --ink: #eee9dd;          /* 主文字（米白） */
  --ink-soft: #aeb9b0;     /* 次文字 */
  --ink-dim: #768379;
  --gold: #cdaa6d;         /* 暖金 */
  --gold-soft: #e6cd97;
  --jade: #2a9d83;
  --jade-2: #1d8068;
  --jade-soft: #74d2b6;
  --line: rgba(205, 170, 109, .22);     /* 金色细线 */
  --panel: rgba(255, 255, 255, .035);
  --panel-2: rgba(255, 255, 255, .055);
  --bubble-user: linear-gradient(135deg, #2a9d83, #1b7d65);
  --bubble-bot: rgba(255, 255, 255, .06);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --shadow: 0 20px 55px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; overflow: hidden; color: var(--ink);
  font-family: var(--sans); -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(1100px 640px at 15% -8%, #1b352b 0%, transparent 56%),
    radial-gradient(920px 620px at 112% 116%, #163029 0%, transparent 52%),
    linear-gradient(160deg, var(--bg-1), var(--bg-0));
  -webkit-user-select: none; user-select: none;
}
body::before { content: ""; position: fixed; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 240px rgba(0, 0, 0, .55); }
.app { display: flex; flex-direction: column; height: 100vh; padding: 28px 38px; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: flex-end; justify-content: space-between;
  padding-bottom: 18px; margin-bottom: 22px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 16px; }
.brand-text h1 {
  margin: 0; font-family: var(--serif); font-weight: 700; font-size: 32px; letter-spacing: 8px;
  background: linear-gradient(180deg, #fbf6ea, #d6bf94);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.brand-text p { margin: 9px 0 0; font-size: 14px; letter-spacing: 6px; color: var(--gold); opacity: .82; }

/* ---------- 舞台 ---------- */
.stage { flex: 1; display: grid; grid-template-columns: 470px 1fr; gap: 34px; min-height: 0; }

/* ---------- 数字人 ---------- */
.avatar-pane {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: 22px; padding: 34px 28px;
  box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.avatar-pane::before { content: ""; position: absolute; top: 0; left: 28px; right: 28px; height: 2px;
  border-radius: 2px; background: linear-gradient(90deg, transparent, var(--gold), transparent); opacity: .55; }

.avatar-glow { position: relative; display: grid; place-items: center; }
.avatar, .avatar-photo, .avatar-video {
  width: 316px; height: 380px; border-radius: 14px; object-fit: cover;
  box-shadow: 0 24px 64px rgba(0, 0, 0, .55), 0 0 0 1px rgba(205, 170, 109, .35);
  transition: transform .4s ease;
}
.avatar-video { box-shadow: 0 24px 64px rgba(0, 0, 0, .55), 0 0 0 2px var(--gold-soft); }
.app.speaking .avatar-photo, .app.speaking .avatar { animation: bob 3.4s ease-in-out infinite; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }

/* 占位 SVG 的嘴部张合 / 眨眼（照片/视频模式下不显示 SVG） */
.mouth { transform-box: fill-box; transform-origin: center; }
.app.speaking #mouthShape { animation: talk .26s ease-in-out infinite alternate; transform-box: fill-box; transform-origin: center; }
@keyframes talk { from { transform: scaleY(.5); } to { transform: scaleY(2.1); } }
.eye { transform-box: fill-box; transform-origin: center; animation: blinkEye 5s infinite; }
@keyframes blinkEye { 0%, 96%, 100% { transform: scaleY(1); } 98% { transform: scaleY(.1); } }

/* 讲述声波环 */
.speak-rings { position: absolute; inset: 0; pointer-events: none; display: grid; place-items: center; }
.speak-rings span { position: absolute; width: 316px; height: 380px; border-radius: 16px;
  border: 1.5px solid var(--gold-soft); opacity: 0; }
.app.speaking .speak-rings span { animation: ring 1.9s ease-out infinite; }
.app.speaking .speak-rings span:nth-child(2) { animation-delay: .63s; }
.app.speaking .speak-rings span:nth-child(3) { animation-delay: 1.26s; }
@keyframes ring { 0% { opacity: .45; transform: scale(1); } 100% { opacity: 0; transform: scale(1.16); } }

/* 聆听时的旋转描边 */
.app.listening .avatar-glow::after { content: ""; position: absolute; inset: -12px; border-radius: 22px;
  border: 1.5px dashed var(--gold); opacity: .6; animation: spin 9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 名牌 */
.avatar-caption { text-align: center; position: relative; padding-top: 6px; }
.avatar-caption::before { content: ""; display: block; width: 46px; height: 1px; margin: 0 auto 14px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent); }
.avatar-caption strong { font-family: var(--serif); font-size: 28px; letter-spacing: 8px; color: var(--gold-soft); }
.avatar-caption span { display: block; color: var(--ink-soft); font-size: 14px; margin-top: 8px; letter-spacing: 3px; }

/* ---------- 对话区 ---------- */
.chat-pane {
  display: flex; flex-direction: column; min-height: 0;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-radius: 22px; padding: 26px 26px 22px;
  box-shadow: var(--shadow);
}
.chat-log { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 18px; padding-right: 10px; }
.chat-log::-webkit-scrollbar { width: 7px; }
.chat-log::-webkit-scrollbar-thumb { background: rgba(205, 170, 109, .25); border-radius: 8px; }

.msg { max-width: 84%; padding: 12px 17px; line-height: 1.75; font-size: 15px; animation: fadeIn .4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.msg.bot {
  align-self: flex-start; background: var(--bubble-bot); color: var(--ink);
  border: 1px solid rgba(255, 255, 255, .06); border-left: 2px solid var(--gold);
  border-radius: 4px 16px 16px 16px;
}
.msg.user {
  align-self: flex-end; background: var(--bubble-user); color: #f2fbf7;
  border-radius: 16px 4px 16px 16px; box-shadow: 0 6px 18px rgba(27, 125, 101, .3);
}
.msg .src { display: block; margin-top: 10px; font-size: 12px; color: var(--ink-dim); letter-spacing: .5px; }
.msg.bot.typing { color: var(--ink-dim); font-style: italic; }

/* 推荐问题 */
.suggestions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 14px; }
.chip {
  padding: 10px 18px; border-radius: 999px; font-size: 15px; cursor: pointer; white-space: nowrap;
  background: rgba(205, 170, 109, .08); border: 1px solid var(--line); color: var(--gold-soft);
  transition: .22s ease;
}
.chip:hover, .chip:active { background: rgba(205, 170, 109, .18); border-color: var(--gold); color: #fbf3e3; transform: translateY(-1px); }

/* 输入区 */
/* 图标内嵌于输入框右侧；发送为圆形上箭头 */
.composer {
  display: flex; align-items: center; gap: 6px; margin-top: 6px;
  background: rgba(0, 0, 0, .26); border: 1px solid var(--line); border-radius: 16px;
  padding: 7px 9px 7px 22px; transition: border-color .2s, box-shadow .2s;
}
.composer:focus-within { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(205, 170, 109, .12); }
.text-input {
  flex: 1; height: 46px; border: none; background: transparent; color: var(--ink);
  font-size: 18px; outline: none; padding: 0;
}
.text-input::placeholder { color: var(--ink-dim); }
.mic-btn, .send-btn {
  width: 44px; height: 44px; flex: 0 0 auto; border-radius: 50%; cursor: pointer; border: none;
  display: grid; place-items: center; transition: .2s;
}
.mic-btn { background: transparent; color: var(--ink-soft); }
.mic-btn:hover { color: var(--gold-soft); background: rgba(205, 170, 109, .14); }
.mic-btn.recording { color: #08130f; background: var(--gold); animation: pulse 1.1s infinite; }
.mic-btn.disabled { opacity: .35; cursor: not-allowed; }
.send-btn { background: transparent; color: var(--gold-soft); }
.send-btn:hover { background: rgba(205, 170, 109, .14); }
.send-btn:disabled { background: transparent; color: var(--ink-dim); cursor: not-allowed; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(205, 170, 109, .55); } 100% { box-shadow: 0 0 0 14px rgba(205, 170, 109, 0); } }

.foot-note { margin-top: 14px; font-size: 12px; color: var(--ink-dim); letter-spacing: .5px; text-align: center; }

/* ---------- 开场遮罩（轻触开始） ---------- */
.start-overlay {
  position: fixed; inset: 0; z-index: 50; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(120% 120% at 50% 42%, rgba(8, 19, 15, .55), rgba(8, 19, 15, .9));
  backdrop-filter: blur(3px);
  animation: ov-in .5s ease both;
}
.start-overlay.hide { animation: ov-out .6s ease forwards; pointer-events: none; }
/* 让 hidden 属性真正生效（否则被 .start-overlay{display:flex} 覆盖，淡出后仍残留全屏层） */
.start-overlay[hidden] { display: none; }
@keyframes ov-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes ov-out { from { opacity: 1; } to { opacity: 0; } }
.start-card { text-align: center; position: relative; padding: 40px 48px; }
.start-ripple { position: relative; width: 92px; height: 92px; margin: 0 auto 30px; }
.start-ripple::before {
  content: ""; position: absolute; inset: 50% auto auto 50%; width: 16px; height: 16px;
  transform: translate(-50%, -50%); border-radius: 50%; background: var(--gold-soft);
  box-shadow: 0 0 18px rgba(230, 205, 151, .8);
}
.start-ripple span {
  position: absolute; inset: 0; border-radius: 50%; border: 1.5px solid var(--gold-soft);
  opacity: 0; animation: ripple 2.4s ease-out infinite;
}
.start-ripple span:nth-child(2) { animation-delay: .8s; }
.start-ripple span:nth-child(3) { animation-delay: 1.6s; }
@keyframes ripple { 0% { opacity: .55; transform: scale(.35); } 100% { opacity: 0; transform: scale(1.1); } }
.start-hint {
  font-family: var(--serif); font-size: 30px; letter-spacing: 12px; color: var(--gold-soft);
  text-shadow: 0 2px 18px rgba(0, 0, 0, .5); animation: hint 2.6s ease-in-out infinite;
}
@keyframes hint { 0%, 100% { opacity: .82; } 50% { opacity: 1; } }
.start-sub { margin-top: 22px; font-size: 14px; letter-spacing: 3px; color: var(--ink-soft); line-height: 2; }
.start-langs { display: flex; gap: 24px; justify-content: center; margin-top: 30px; }
.start-lang {
  font-family: var(--serif); font-size: 22px; letter-spacing: 4px; color: var(--gold-soft);
  padding: 13px 42px; border-radius: 12px; cursor: pointer;
  background: rgba(205, 170, 109, .06); border: 1px solid var(--line);
  transition: background .25s ease, transform .15s ease, border-color .25s ease;
}
.start-lang:hover { background: rgba(205, 170, 109, .16); border-color: var(--gold); transform: translateY(-2px); }

/* 顶部 中/EN 语言开关 */
.lang-switch { display: flex; gap: 4px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255, 255, 255, .03); }
.lang-opt {
  font-size: 13px; letter-spacing: 1px; color: var(--ink-soft); cursor: pointer;
  padding: 5px 15px; border-radius: 999px; border: none; background: transparent; font-family: var(--sans);
  transition: background .2s ease, color .2s ease;
}
.lang-opt.active { background: linear-gradient(135deg, var(--jade), var(--jade-2)); color: #fff; }
.lang-opt:not(.active):hover { color: var(--gold-soft); }

/* ---------- 窄屏自适应 ---------- */
@media (max-width: 1000px) {
  .stage { grid-template-columns: 1fr; grid-template-rows: auto 1fr; gap: 22px; }
  .avatar, .avatar-photo, .avatar-video, .speak-rings span { width: 232px; height: 280px; }
  .app { padding: 20px; }
  .start-hint { font-size: 24px; letter-spacing: 8px; }
}