:root {
  /* 手机高度；内部尺寸都按手机高度的百分之一（--u）缩放 */
  --ph: 94vh;
  --u: calc(var(--ph) / 100);
  --green: #34c759;
  --red: #ff3b30;
  --cyan: #5ac8fa;
  --orange: #ff7a45;
  --ink: #1d2a3a;
  --font: -apple-system, "SF Pro Display", "PingFang SC", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

@media (max-aspect-ratio: 9/20) {
  :root { --ph: calc(94vw * 2.1667); }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #08090b;
  color: #fff;
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; padding: 0; touch-action: manipulation; }
svg { display: block; fill: currentColor; }

.app { position: relative; height: 100%; }

.stage {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 42%, #2b2f37 0%, #16181d 46%, #08090b 100%);
}

/* ---------- 手机外壳 ---------- */

.phone {
  position: relative;
  width: calc(var(--u) * 46.2);
  height: var(--ph);
  padding: calc(var(--u) * 1.15);
  border-radius: calc(var(--u) * 8.2);
  background: linear-gradient(145deg, #45474d 0%, #1d1e21 16%, #0b0b0d 50%, #1d1e21 84%, #45474d 100%);
  box-shadow:
    inset 0 0 0 calc(var(--u) * 0.22) #55585e,
    inset 0 0 0 calc(var(--u) * 0.5) #0a0a0b,
    0 calc(var(--u) * 3) calc(var(--u) * 9) rgba(0, 0, 0, 0.7),
    0 0 calc(var(--u) * 14) rgba(90, 200, 250, 0.07);
}

.side-btn {
  position: absolute;
  width: calc(var(--u) * 0.6);
  border-radius: calc(var(--u) * 0.3);
  background: linear-gradient(90deg, #24252a, #4a4c52);
}
.side-btn.action { left: calc(var(--u) * -0.45); top: 16%; height: 3.4%; }
.side-btn.vol-up { left: calc(var(--u) * -0.45); top: 23%; height: 6.6%; }
.side-btn.vol-down { left: calc(var(--u) * -0.45); top: 31.5%; height: 6.6%; }
.side-btn.power { right: calc(var(--u) * -0.45); top: 26%; height: 10.5%; background: linear-gradient(270deg, #24252a, #4a4c52); }

.screen {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: calc(var(--u) * 7.1);
  background: radial-gradient(ellipse at 50% 28%, #2c2e33 0%, #18191c 55%, #0e0e10 100%);
}

.statusbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: calc(var(--u) * 5.6);
  padding: calc(var(--u) * 0.4) calc(var(--u) * 3.4) 0 calc(var(--u) * 4.6);
  font-size: calc(var(--u) * 1.8);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.sb-icons { display: flex; align-items: center; }
.sb-icons > * + * { margin-left: calc(var(--u) * 0.6); }
.sb-signal { width: calc(var(--u) * 1.8); height: calc(var(--u) * 1.2); }
.sb-wifi { width: calc(var(--u) * 1.7); height: calc(var(--u) * 1.3); }
.sb-battery {
  position: relative;
  width: calc(var(--u) * 2.6);
  height: calc(var(--u) * 1.3);
  padding: calc(var(--u) * 0.14);
  border: calc(var(--u) * 0.12) solid rgba(255, 255, 255, 0.5);
  border-radius: calc(var(--u) * 0.38);
}
.sb-battery::after {
  content: "";
  position: absolute;
  right: calc(var(--u) * -0.4);
  top: 30%;
  width: calc(var(--u) * 0.2);
  height: 40%;
  border-radius: 0 2px 2px 0;
  background: rgba(255, 255, 255, 0.5);
}
.sb-battery i { display: block; width: 82%; height: 100%; border-radius: calc(var(--u) * 0.18); background: #fff; }

.island {
  position: absolute;
  top: calc(var(--u) * 1.1);
  left: 50%;
  z-index: 4;
  width: calc(var(--u) * 12.6);
  height: calc(var(--u) * 3.6);
  margin-left: calc(var(--u) * -6.3);
  border-radius: 999px;
  background: #000;
}

.home-indicator {
  position: absolute;
  left: 50%;
  bottom: calc(var(--u) * 0.9);
  width: calc(var(--u) * 14);
  height: calc(var(--u) * 0.55);
  margin-left: calc(var(--u) * -7);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
}

/* ---------- 屏幕内容 ---------- */

.content {
  position: absolute;
  top: calc(var(--u) * 5.6);
  right: 0;
  bottom: calc(var(--u) * 2.4);
  left: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 calc(var(--u) * 2.2);
}

.caller { flex: 0 0 auto; margin-top: calc(var(--u) * 3.6); text-align: center; transition: margin 0.4s ease; }
.caller-name {
  margin: 0;
  font-size: calc(var(--u) * 4.7);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  transition: font-size 0.4s ease;
}
.caller-sub, .call-timer, .ended-time {
  margin: calc(var(--u) * 0.8) 0 0;
  font-size: calc(var(--u) * 1.9);
  color: rgba(255, 255, 255, 0.6);
  font-variant-numeric: tabular-nums;
}
.call-timer, .ended-time { display: none; }
.caller-sub:empty { display: none; }

/* 椭圆头像 + 眨眼 */
.avatar-wrap { position: relative; flex: 0 0 auto; margin-top: calc(var(--u) * 4.4); }
.avatar {
  position: relative;
  width: calc(var(--u) * 38.6);
  height: calc(var(--u) * 46);
  border-radius: 50%;
  overflow: hidden;
  background: #efeded;
  box-shadow: 0 calc(var(--u) * 1.2) calc(var(--u) * 4) rgba(0, 0, 0, 0.45);
  transition: width 0.45s ease, height 0.45s ease, box-shadow 0.15s linear;
}
.avatar img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.eyes-closed { opacity: 0; animation: blink 5.2s infinite; }
@keyframes blink {
  0%, 93%, 100% { opacity: 0; }
  94.2%, 96.4% { opacity: 1; }
}

.ai-dots {
  position: absolute;
  top: 14%;
  right: calc(var(--u) * -1.6);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.ai-dots i {
  width: calc(var(--u) * 1.7);
  height: calc(var(--u) * 1.7);
  border-radius: 50%;
  background: rgba(90, 200, 250, 0.35);
  box-shadow: 0 0 calc(var(--u) * 1.2) rgba(90, 200, 250, 0.55);
  animation: dot 1.8s ease-in-out infinite;
}
.ai-dots i + i { margin-top: calc(var(--u) * 3.4); }
.ai-dots i:nth-child(2) { animation-delay: 0.3s; }
.ai-dots i:nth-child(3) { animation-delay: 0.6s; }
@keyframes dot {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1.12); background: rgba(90, 200, 250, 0.95); }
}

.avatar-wrap.talking .avatar {
  box-shadow:
    0 0 0 calc(var(--u) * (0.4 + var(--lvl, 0.3) * 1.2)) rgba(90, 200, 250, 0.6),
    0 calc(var(--u) * 1.2) calc(var(--u) * 4) rgba(0, 0, 0, 0.45);
  animation: talk 0.9s ease-in-out infinite;
}
.avatar-wrap.talking .ai-dots i { animation-duration: 0.75s; }
.avatar-wrap.listening .avatar {
  box-shadow:
    0 0 0 calc(var(--u) * 0.6) rgba(52, 199, 89, 0.85),
    0 calc(var(--u) * 1.2) calc(var(--u) * 4) rgba(0, 0, 0, 0.45);
}
.avatar-wrap.listening .ai-dots i { background: rgba(52, 199, 89, 0.5); box-shadow: 0 0 calc(var(--u) * 1.2) rgba(52, 199, 89, 0.6); }
@keyframes talk {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.015); }
}

.avatar-status {
  display: none;
  position: absolute;
  left: 50%;
  bottom: calc(var(--u) * -1.4);
  transform: translateX(-50%);
  padding: calc(var(--u) * 0.5) calc(var(--u) * 1.4);
  border-radius: 999px;
  background: var(--green);
  font-size: calc(var(--u) * 1.4);
  font-weight: 700;
  white-space: nowrap;
}
.avatar-wrap.listening .avatar-status { display: block; }

/* ---------- 来电 ---------- */

.incoming-actions {
  display: none;
  justify-content: space-between;
  width: 100%;
  margin-top: auto;
  margin-bottom: calc(var(--u) * 5);
  padding: 0 calc(var(--u) * 3.2);
}
.round-btn { display: flex; flex-direction: column; align-items: center; color: #fff; }
.round-btn .disc {
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--u) * 7.8);
  height: calc(var(--u) * 7.8);
  border-radius: 50%;
  transition: transform 0.15s ease;
}
.round-btn:active .disc { transform: scale(0.94); }
.round-btn svg { width: 46%; height: 46%; fill: #fff; }
.round-btn .label { margin-top: calc(var(--u) * 1.2); font-size: calc(var(--u) * 1.9); }
.decline .disc {
  background: radial-gradient(circle at 35% 30%, #ff8a80 0%, #ff3b30 55%, #d4261c 100%);
  box-shadow: 0 0 calc(var(--u) * 2.2) rgba(255, 59, 48, 0.45);
}
.answer .disc {
  background: radial-gradient(circle at 35% 30%, #8ae69a 0%, #34c759 55%, #1f9f43 100%);
  animation: glow 1.6s ease-in-out infinite;
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 calc(var(--u) * 1.2) rgba(52, 199, 89, 0.35); }
  50% { box-shadow: 0 0 calc(var(--u) * 3.8) rgba(52, 199, 89, 0.9); }
}
.app.declined .answer .disc { animation: none; box-shadow: none; }
.app.declined .ai-dots i { animation: none; }

/* ---------- 通话中 ---------- */

.call-area {
  display: none;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: 0;
  margin-top: calc(var(--u) * 2.4);
}

.captions {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  width: 100%;
  min-height: 0;
  overflow-y: auto;
  padding: calc(var(--u) * 1.3);
  border-radius: calc(var(--u) * 2.2);
  background: rgba(255, 255, 255, 0.06);
  scroll-behavior: smooth;
  scrollbar-width: none;
}
.captions::-webkit-scrollbar { display: none; }
.captions::before { content: ""; margin-top: auto; }
.captions > * + * { margin-top: calc(var(--u) * 1); }

.bubble {
  max-width: 92%;
  padding: calc(var(--u) * 1) calc(var(--u) * 1.4);
  border-radius: calc(var(--u) * 1.7);
  font-size: calc(var(--u) * 2.05);
  line-height: 1.35;
  opacity: 0.45;
  transition: opacity 0.3s ease;
  user-select: text;
}
.bubble.recent { opacity: 1; }
.bubble.millie { align-self: flex-start; background: rgba(255, 255, 255, 0.15); border-top-left-radius: calc(var(--u) * 0.4); }
.bubble.student { align-self: flex-end; background: rgba(52, 199, 89, 0.3); color: #dcffe5; border-top-right-radius: calc(var(--u) * 0.4); }
.bubble.student.empty { background: rgba(255, 255, 255, 0.08); color: rgba(255, 255, 255, 0.55); font-style: italic; }
.bubble.typing { display: inline-flex; align-items: center; padding: calc(var(--u) * 1.3) calc(var(--u) * 1.6); opacity: 1; }
.bubble.typing i, .i-dots i {
  width: calc(var(--u) * 0.8);
  height: calc(var(--u) * 0.8);
  margin: 0 calc(var(--u) * 0.25);
  border-radius: 50%;
  background: currentColor;
  animation: blinkdot 1.2s infinite ease-in-out;
}
.bubble.typing i:nth-child(2), .i-dots i:nth-child(2) { animation-delay: 0.2s; }
.bubble.typing i:nth-child(3), .i-dots i:nth-child(3) { animation-delay: 0.4s; }
@keyframes blinkdot {
  0%, 80%, 100% { opacity: 0.25; transform: scale(0.85); }
  40% { opacity: 1; transform: scale(1); }
}

.mic-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(var(--u) * 2.6);
  margin: auto 0 calc(var(--u) * 1.2);
  padding-top: calc(var(--u) * 1.4);
  font-size: calc(var(--u) * 2);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
}
.wave { display: none; align-items: center; height: calc(var(--u) * 2.4); margin-right: calc(var(--u) * 1); }
.wave i {
  width: calc(var(--u) * 0.45);
  height: 30%;
  margin: 0 calc(var(--u) * 0.16);
  border-radius: 2px;
  background: var(--green);
  animation: bar 0.9s ease-in-out infinite;
}
.wave i:nth-child(2) { animation-delay: 0.15s; }
.wave i:nth-child(3) { animation-delay: 0.3s; }
.wave i:nth-child(4) { animation-delay: 0.1s; }
.wave i:nth-child(5) { animation-delay: 0.25s; }
@keyframes bar {
  0%, 100% { height: 25%; }
  50% { height: 100%; }
}
.avatar-wrap.listening ~ .call-area .wave { display: inline-flex; }
.avatar-wrap.listening ~ .call-area .mic-hint { color: #8dffad; }

.call-controls {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  width: 100%;
  margin-bottom: calc(var(--u) * 1.8);
  padding: 0 calc(var(--u) * 1.8);
}
.ctrl, .mic { position: relative; display: flex; flex-direction: column; align-items: center; color: #fff; }
.ctrl .disc, .mic .disc {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease, transform 0.15s ease;
}
.ctrl .disc { width: calc(var(--u) * 6.6); height: calc(var(--u) * 6.6); margin-top: calc(var(--u) * 0.9); background: rgba(255, 255, 255, 0.16); }
.ctrl svg { width: 44%; height: 44%; fill: #fff; }
.ctrl:active .disc, .mic:active .disc { transform: scale(0.94); }
.ctrl.hangup .disc { background: radial-gradient(circle at 35% 30%, #ff8a80 0%, #ff3b30 55%, #d4261c 100%); }
.ctrl .label, .mic .label { margin-top: calc(var(--u) * 1); font-size: calc(var(--u) * 1.6); color: rgba(255, 255, 255, 0.8); }

.mic { touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }
.mic .disc { position: relative; width: calc(var(--u) * 8.4); height: calc(var(--u) * 8.4); background: #fff; color: #111; }
.mic svg { width: 44%; height: 44%; }
.mic .i-stop, .mic .i-dots { display: none; }
.mic-level {
  position: absolute;
  top: 0;
  left: 50%;
  width: calc(var(--u) * 8.4);
  height: calc(var(--u) * 8.4);
  margin-left: calc(var(--u) * -4.2);
  border-radius: 50%;
  background: rgba(52, 199, 89, 0.38);
  opacity: 0;
  transform: scale(calc(1 + var(--lvl, 0) * 0.55));
  transition: transform 0.08s linear;
}
.mic[data-state="idle"] .disc { animation: invite 1.6s ease-in-out infinite; }
@keyframes invite {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.45); }
  50% { box-shadow: 0 0 0 calc(var(--u) * 1.2) rgba(255, 255, 255, 0); }
}
.mic[data-state="listening"] .disc { background: var(--green); color: #fff; }
.mic[data-state="listening"] .mic-level { opacity: 1; }
.mic[data-state="listening"][data-hold="1"] .i-mic { display: none; }
.mic[data-state="listening"][data-hold="1"] .i-stop { display: block; }
.mic[data-state="speaking"] .disc { background: rgba(255, 255, 255, 0.16); color: #fff; }
.mic[data-state="thinking"] .disc { background: rgba(255, 255, 255, 0.16); color: #fff; }
.mic[data-state="thinking"] .i-mic { display: none; }
.mic[data-state="thinking"] .i-dots { display: inline-flex; }
.mic[data-state="off"] .disc { background: rgba(255, 255, 255, 0.08); color: rgba(255, 255, 255, 0.35); }

.app.no-captions .captions { display: none; }

/* ---------- 结束 ---------- */

.ended {
  display: none;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: 0;
  margin-top: calc(var(--u) * 2.4);
}
.ended-summary {
  flex: 0 1 auto;
  width: 100%;
  min-height: 0;
  margin: 0;
  padding: calc(var(--u) * 1.8) calc(var(--u) * 2);
  overflow-y: auto;
  border-radius: calc(var(--u) * 2);
  background: rgba(255, 255, 255, 0.1);
  font-size: calc(var(--u) * 2);
  line-height: 1.45;
  user-select: text;
}
.ended-summary:empty { display: none; }
.pill-btn {
  margin-top: auto;
  padding: calc(var(--u) * 1.6) calc(var(--u) * 3.6);
  border-radius: 999px;
  background: var(--green);
  color: #fff;
  font-size: calc(var(--u) * 2);
  font-weight: 700;
  box-shadow: 0 0 calc(var(--u) * 2.4) rgba(52, 199, 89, 0.45);
}
.pill-btn:active { transform: scale(0.97); }

/* ---------- 按屏幕切换布局 ---------- */

.app[data-screen="incoming"] .incoming-actions { display: flex; }

.app[data-screen="call"] .caller,
.app[data-screen="ended"] .caller { margin-top: calc(var(--u) * 1.4); }
.app[data-screen="call"] .caller-name,
.app[data-screen="ended"] .caller-name { font-size: calc(var(--u) * 3.3); }
.app[data-screen="call"] .caller-sub,
.app[data-screen="ended"] .caller-sub { display: none; }
.app[data-screen="call"] .call-timer { display: block; }
.app[data-screen="call"] .avatar-wrap { margin-top: calc(var(--u) * 2.2); }
.app[data-screen="call"] .avatar { width: calc(var(--u) * 22.4); height: calc(var(--u) * 26.6); }
.app[data-screen="call"] .ai-dots { right: calc(var(--u) * -2.2); }
.app[data-screen="call"] .ai-dots i { width: calc(var(--u) * 1.2); height: calc(var(--u) * 1.2); }
.app[data-screen="call"] .ai-dots i + i { margin-top: calc(var(--u) * 2.2); }
.app[data-screen="call"] .call-area { display: flex; }
.app.no-captions[data-screen="call"] .avatar { width: calc(var(--u) * 32); height: calc(var(--u) * 38); }

.app[data-screen="ended"] .ended-time { display: block; }
.app[data-screen="ended"] .avatar-wrap { margin-top: calc(var(--u) * 2.4); }
.app[data-screen="ended"] .avatar { width: calc(var(--u) * 17); height: calc(var(--u) * 20.2); }
.app[data-screen="ended"] .ai-dots { display: none; }
.app[data-screen="ended"] .ended { display: flex; }

/* ---------- 手机外：教师工具与浮层 ---------- */

.teacher-tools { position: absolute; top: 2.4vh; right: 2vw; display: flex; }
.tool {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 5.6vmin;
  height: 5.6vmin;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.07);
  color: rgba(255, 255, 255, 0.55);
  font-size: 1.8vmin;
  font-weight: 700;
}
.tool + .tool { margin-left: 1.2vmin; }
.tool svg { width: 2.8vmin; height: 2.8vmin; }
.tool[aria-pressed="true"] { background: rgba(255, 255, 255, 0.2); color: #fff; }

.toast {
  position: absolute;
  top: calc(var(--u) * 5.8);
  left: calc(var(--u) * 2.6);
  right: calc(var(--u) * 2.6);
  z-index: 5;
  padding: calc(var(--u) * 1.2) calc(var(--u) * 1.6);
  border-radius: calc(var(--u) * 1.8);
  background: rgba(44, 46, 52, 0.97);
  box-shadow: 0 calc(var(--u) * 1) calc(var(--u) * 3) rgba(0, 0, 0, 0.45);
  font-size: calc(var(--u) * 1.7);
  line-height: 1.4;
  text-align: center;
}
.toast[hidden] { display: none; }

.settings {
  width: 90vw;
  max-width: 560px;
  padding: 28px;
  border: 0;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  color: var(--ink);
  user-select: none;
}
.settings::backdrop { background: rgba(0, 0, 0, 0.5); }
.settings h3 { margin: 0 0 18px; font-size: 22px; }
.field { display: flex; flex-direction: column; margin-bottom: 18px; font-size: 16px; }
.field.note { margin-top: 0; line-height: 1.5; color: #526070; }
.field > span { margin-bottom: 8px; }
.field select, .field input[type="range"] { width: 100%; }
.field select { padding: 10px 12px; border: 1px solid #d5dde6; border-radius: 10px; background: #fff; color: var(--ink); }
.field.check { flex-direction: row; align-items: center; }
.field.check > span { margin: 0 0 0 8px; }
.field.check input { width: 20px; height: 20px; }
.status-line { margin: 0 0 18px; padding: 12px 14px; border-radius: 10px; background: #f3f6f9; color: #5f7086; font-size: 14px; line-height: 1.6; }
.dialog-actions { display: flex; justify-content: flex-end; }
.pill-btn.small { margin: 0; padding: 10px 26px; font-size: 16px; box-shadow: none; }

.compat {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 20;
  padding: 10vh 10vw;
  background: #f6fbff;
  color: #1d2a3a;
  font-size: 22px;
  line-height: 1.6;
}
.compat[hidden] { display: none; }
.compat h2 { margin: 0 0 16px; font-size: 30px; }
.compat-url {
  padding: 14px 18px;
  border: 1px solid #d5dde6;
  border-radius: 10px;
  background: #fff;
  word-break: break-all;
  user-select: text;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}