/* 越生活 · H5 样式（零依赖，移动优先）
   字体栈必须覆盖越南语全部附加符号；不加载外部字体，保证首屏体积与离线可用。 */
:root {
  --bg: #F4F7FC;
  --card: #FFFFFF;
  --ink: #1B2333;
  --ink-2: #3C4658;
  --muted: #6B7686;
  --line: #E3E9F1;
  --brand: #2F6BFF;
  --brand-soft: #EAF1FF;
  --green: #19B37A;
  --green-soft: #E6F7F0;
  --amber: #F5A623;
  --amber-soft: #FFF3DC;
  --red: #E4572E;
  --red-soft: #FFEDE6;
  --purple: #7A5CC4;
  --purple-soft: #F0EAFB;
  --shadow: 0 4px 18px rgba(27, 35, 51, .07);
  --shadow-lg: 0 12px 36px rgba(27, 35, 51, .14);
  --radius: 16px;
  --font: "Be Vietnam Pro", "Inter", "Noto Sans", "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131824; --card: #1D2432; --ink: #EDF1F8; --ink-2: #C7D0DE;
    --muted: #93A0B2; --line: #2C3648;
    --brand-soft: #1E2C4A; --green-soft: #16362B; --amber-soft: #3B2F18;
    --red-soft: #3A221B; --purple-soft: #2B2340;
    --shadow: 0 4px 18px rgba(0, 0, 0, .28); --shadow-lg: 0 12px 36px rgba(0, 0, 0, .4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font);
  font-size: 15px; line-height: 1.62; -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--brand); text-decoration: none; }
.vi { font-feature-settings: "kern" 1; }

/* ---------- 骨架 ---------- */
.app { max-width: 900px; margin: 0 auto; min-height: 100vh; }
.topbar {
  position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(12px); border-bottom: 1px solid var(--line);
}
.topbar__logo {
  width: 32px; height: 32px; border-radius: 10px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--brand), #6E9BFF); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 15px; letter-spacing: -.5px;
}
.topbar__title { font-weight: 750; font-size: 15px; line-height: 1.2; }
.topbar__sub { font-size: 11px; color: var(--muted); line-height: 1.2; }
.topbar__spacer { flex: 1; }
.topbar__id {
  font-size: 12px; color: var(--muted); background: var(--bg);
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px;
}
main { padding: 16px 16px 104px; }
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: flex; justify-content: space-around; gap: 2px;
  padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--card) 94%, transparent);
  backdrop-filter: blur(12px); border-top: 1px solid var(--line);
}
.tabbar button {
  flex: 1; border: 0; background: transparent; color: var(--muted);
  display: grid; gap: 2px; justify-items: center; padding: 4px 2px; border-radius: 12px;
  font-size: 11px; transition: color .2s, background .2s;
}
.tabbar button .ico { display: block; line-height: 0; }
.tabbar button .ico svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tabbar button.is-on { color: var(--brand); background: var(--brand-soft); font-weight: 700; }

/* ---------- 通用元素 ---------- */
.hero {
  background: linear-gradient(135deg, #2F6BFF 0%, #6E9BFF 55%, #19B37A 160%);
  color: #fff; border-radius: 22px; padding: 22px 20px; box-shadow: var(--shadow-lg);
  position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -40px; top: -60px; width: 190px; height: 190px;
  border-radius: 50%; background: rgba(255,255,255,.12);
}
.hero h1 { margin: 0 0 6px; font-size: 23px; line-height: 1.28; letter-spacing: -.4px; }
.hero p { margin: 0; opacity: .92; font-size: 13px; max-width: 90%; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; position: relative; z-index: 1; }
.hero__meta span {
  font-size: 11px; background: rgba(255,255,255,.19); border: 1px solid rgba(255,255,255,.25);
  padding: 4px 9px; border-radius: 999px;
}
.hero__actions { display: flex; gap: 8px; margin-top: 16px; position: relative; z-index: 1; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 11px; padding: 9px 14px; font-size: 13px; font-weight: 650;
  transition: transform .12s, box-shadow .2s, background .2s;
}
.btn:active { transform: scale(.97); }
.btn--primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn--ghost { background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.35); color: #fff; }
.btn--sm { padding: 6px 10px; font-size: 12px; border-radius: 9px; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

.section { margin-top: 22px; }
.section__head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 10px; }
.section__head h2 { margin: 0; font-size: 17px; letter-spacing: -.3px; }
.section__head .hint { font-size: 12px; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.pad { padding: 15px; }
.muted { color: var(--muted); font-size: 12px; }
.chip {
  display: inline-block; font-size: 11px; padding: 3px 9px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand); font-weight: 700; border: 1px solid color-mix(in srgb, var(--brand) 18%, transparent);
}
.chip--green { background: var(--green-soft); color: var(--green); border-color: color-mix(in srgb, var(--green) 20%, transparent); }
.chip--amber { background: var(--amber-soft); color: #B8790A; border-color: color-mix(in srgb, var(--amber) 28%, transparent); }
.chip--red { background: var(--red-soft); color: var(--red); border-color: color-mix(in srgb, var(--red) 22%, transparent); }
.chip--purple { background: var(--purple-soft); color: var(--purple); border-color: color-mix(in srgb, var(--purple) 22%, transparent); }
.chip--gray { background: var(--bg); color: var(--muted); border-color: var(--line); }

.grid { display: grid; gap: 10px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 560px) { .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- 首页 ---------- */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 12px; }
.stat {
  background: var(--card); border: 1px solid var(--line); border-radius: 13px;
  padding: 10px 8px; text-align: center;
}
.stat b { display: block; font-size: 17px; line-height: 1.2; }
.stat span { font-size: 10px; color: var(--muted); }
.unit-card {
  display: flex; gap: 12px; align-items: flex-start; padding: 13px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); width: 100%; text-align: left; transition: transform .12s, border-color .2s;
}
.unit-card:active { transform: scale(.99); }
.unit-card:hover { border-color: color-mix(in srgb, var(--brand) 35%, var(--line)); }
.unit-card__no {
  flex: 0 0 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); font-weight: 800; font-size: 13px;
}
.unit-card__no.is-done { background: var(--green-soft); color: var(--green); }
.unit-card__body { flex: 1; min-width: 0; }
.unit-card__body h3 { margin: 0 0 2px; font-size: 14px; }
.unit-card__body p { margin: 0; font-size: 11.5px; color: var(--muted); }
.unit-card__bar { height: 4px; border-radius: 4px; background: var(--bg); margin-top: 8px; overflow: hidden; }
.unit-card__bar i { display: block; height: 100%; background: var(--brand); border-radius: 4px; }

/* ---------- 课页 ---------- */
.crumb { font-size: 12px; color: var(--muted); margin-bottom: 10px; display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.crumb a { cursor: pointer; }
.lesson-head h1 { margin: 0 0 6px; font-size: 21px; letter-spacing: -.4px; line-height: 1.3; }
.lesson-head .goal { color: var(--muted); font-size: 12.5px; margin: 0; }
.hook {
  margin-top: 14px; border-radius: 15px; padding: 13px 15px;
  background: linear-gradient(120deg, var(--amber-soft), transparent 85%);
  border: 1px solid color-mix(in srgb, var(--amber) 30%, var(--line));
}
.hook__tag { font-size: 11px; font-weight: 800; color: #B8790A; letter-spacing: .4px; }
.hook p { margin: 5px 0 0; font-size: 13.5px; color: var(--ink-2); }
.block { margin-top: 18px; }
.block__title {
  display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 750; margin-bottom: 9px;
}
.block__title .num {
  width: 22px; height: 22px; border-radius: 7px; background: var(--brand-soft); color: var(--brand);
  display: grid; place-items: center; font-size: 11px; font-weight: 800;
}

.word-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 11px 12px 36px;
  text-align: left; width: 100%; transition: border-color .2s, transform .12s; position: relative;
}
.word-card:active { transform: scale(.98); }
.word-card.is-playing { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.word-card__vi { font-size: 16px; font-weight: 750; color: var(--ink); line-height: 1.35; }
.word-card__zh { font-size: 12px; color: var(--muted); margin-top: 2px; }
.word-card__ipa { font-size: 10.5px; color: var(--muted); opacity: .85; margin-top: 3px; font-family: ui-monospace, monospace; }
.word-card__note { font-size: 11px; color: var(--ink-2); margin-top: 5px; border-top: 1px dashed var(--line); padding-top: 5px; }
.word-card__play { position: absolute; right: 9px; top: 9px; font-size: 13px; color: var(--brand); }
.word-card__fav {
  position: absolute; right: 9px; bottom: 7px; font-size: 11px; color: var(--muted);
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 8px; line-height: 1.5;
}

.sentences { display: grid; gap: 9px; }
.sentence { display: flex; gap: 9px; align-items: flex-start; }
.sentence__avatar { flex: 0 0 36px; }
.sentence__avatar svg { width: 36px; height: 49px; }
.bubble {
  background: var(--card); border: 1px solid var(--line); border-radius: 4px 13px 13px 13px;
  padding: 9px 12px; box-shadow: var(--shadow); flex: 1; min-width: 0;
}
.bubble__name { font-size: 10.5px; color: var(--muted); margin-bottom: 2px; }
.bubble__vi { font-size: 15px; font-weight: 650; cursor: pointer; }
.bubble__vi:hover { color: var(--brand); }
.bubble__zh { font-size: 11.5px; color: var(--muted); margin-top: 2px; }

.kcard { border-radius: 15px; padding: 14px 15px; border: 1px solid; }
.kcard--K { background: var(--brand-soft); border-color: color-mix(in srgb, var(--brand) 24%, transparent); }
.kcard--M { background: var(--red-soft); border-color: color-mix(in srgb, var(--red) 26%, transparent); }
.kcard--E { background: var(--purple-soft); border-color: color-mix(in srgb, var(--purple) 26%, transparent); }
.kcard__top { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; flex-wrap: wrap; }
.kcard__id { font-size: 11px; font-weight: 800; letter-spacing: .4px; }
.kcard--K .kcard__id { color: var(--brand); }
.kcard--M .kcard__id { color: var(--red); }
.kcard--E .kcard__id { color: var(--purple); }
.kcard h3 { margin: 0; font-size: 15px; }
.kcard p { margin: 7px 0 0; font-size: 13px; line-height: 1.72; color: var(--ink-2); }

/* ---------- 场景舞台 ---------- */
.stage {
  position: relative; border-radius: 16px; overflow: hidden; height: 210px;
  background: linear-gradient(180deg, #DCEBFF 0%, #F3F8FF 62%, #EAF1E6 100%);
  border: 1px solid var(--line);
}
@media (prefers-color-scheme: dark) {
  .stage { background: linear-gradient(180deg, #243250 0%, #1D2940 62%, #223027 100%); }
}
.stage__sky { position: absolute; inset: 0; }
.stage__sun {
  position: absolute; right: 24px; top: 16px; width: 36px; height: 36px; border-radius: 50%;
  background: #FFD84D; box-shadow: 0 0 0 10px rgba(255,216,77,.2);
}
.stage__cloud {
  position: absolute; left: 22px; top: 24px; width: 62px; height: 16px; border-radius: 999px;
  background: rgba(255,255,255,.75); box-shadow: 34px 8px 0 -3px rgba(255,255,255,.6);
}
.stage__floor { position: absolute; left: 0; right: 0; bottom: 0; height: 46px; background: rgba(255,255,255,.35); border-top: 1px solid rgba(0,0,0,.05); }
.stage__actors {
  position: absolute; left: 0; right: 0; bottom: 10px; display: flex; justify-content: center;
  align-items: flex-end; gap: clamp(2px, 3vw, 22px); z-index: 2;
}
.stage__actors .char { width: clamp(78px, 24vw, 108px); height: auto; }
.stage__prop { position: absolute; left: 50%; top: 46%; transform: translate(-50%, -50%); z-index: 1; opacity: .92; }
.stage__prop .prop { width: clamp(80px, 22vw, 130px); height: auto; }
.scene-caption { font-size: 11.5px; color: var(--muted); margin-top: 7px; text-align: center; }
.scene-lines { display: grid; gap: 6px; margin-top: 10px; }
.scene-line { font-size: 12.5px; display: flex; gap: 7px; align-items: baseline; }
.scene-line b { color: var(--brand); flex: 0 0 auto; font-size: 11px; }
.scene-line .vi { font-weight: 650; cursor: pointer; }
.scene-line .zh { color: var(--muted); font-size: 11px; }

/* ---------- SVG 角色动作 ----------
   肩 / 肘 / 头 / 身体 / 腿分层，各层动画时长与 delay 错开，
   动作不再像整块木板一起摆动。角色库入场 char--idle 完全静止。 */
.char__arm { transform-box: fill-box; transform-origin: top center; }
.char__forearm { transform-box: fill-box; transform-origin: top center; }
.char__head { transform-box: fill-box; transform-origin: center bottom; }
.char__body { transform-box: fill-box; transform-origin: center bottom; }
.char__legs { transform-box: fill-box; transform-origin: center bottom; }
.char__leg--l, .char__leg--r { transform-box: fill-box; transform-origin: top center; }
.char__mouth, .char__eyes { transform-box: fill-box; transform-origin: center; }

/* 入场静止：连说话口型也不动，点角色后才开始表演 */
.char--idle, .char--idle * { animation: none !important; }

@keyframes vi-armWave { 0%,100% { transform: rotate(-118deg); } 50% { transform: rotate(-127deg); } }
@keyframes vi-foreWave { 0%,100% { transform: rotate(-20deg); } 50% { transform: rotate(24deg); } }
@keyframes vi-armPoint { 0%,100% { transform: rotate(-62deg); } 50% { transform: rotate(-55deg); } }
@keyframes vi-armHandover { 0%,100% { transform: rotate(-14deg) translateX(0); } 45% { transform: rotate(-56deg) translateX(-5px); } }
@keyframes vi-foreTalk { 0%,100% { transform: rotate(-4deg); } 50% { transform: rotate(-16deg); } }
@keyframes vi-foreCount { 0%,100% { transform: rotate(0) translateY(0); } 35% { transform: rotate(-26deg) translateY(-3px); } 70% { transform: rotate(-4deg) translateY(1px); } }
@keyframes vi-armPresentL { 0%,100% { transform: rotate(28deg); } 50% { transform: rotate(38deg); } }
@keyframes vi-armPresentR { 0%,100% { transform: rotate(-28deg); } 50% { transform: rotate(-38deg); } }
@keyframes vi-armCarryL { 0%,100% { transform: rotate(-32deg); } 50% { transform: rotate(-36deg); } }
@keyframes vi-armCarryR { 0%,100% { transform: rotate(32deg); } 50% { transform: rotate(36deg); } }
@keyframes vi-armCheerL { 0%,100% { transform: rotate(118deg); } 50% { transform: rotate(134deg); } }
@keyframes vi-armCheerR { 0%,100% { transform: rotate(-118deg); } 50% { transform: rotate(-134deg); } }
@keyframes vi-armShrugL { 0%,100% { transform: rotate(6deg); } 50% { transform: rotate(22deg); } }
@keyframes vi-armShrugR { 0%,100% { transform: rotate(-6deg); } 50% { transform: rotate(-22deg); } }
@keyframes vi-headNod { 0%,100% { transform: rotate(0); } 45% { transform: rotate(9deg); } }
@keyframes vi-headTilt { 0%,100% { transform: rotate(0); } 50% { transform: rotate(-6deg); } }
@keyframes vi-headBow { 0%,100% { transform: rotate(0) translateY(0); } 50% { transform: rotate(14deg) translateY(2px); } }
@keyframes vi-bodySway { 0%,100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-2px) rotate(-1.5deg); } }
@keyframes vi-bodyBow { 0%,100% { transform: rotate(0) translateY(0); } 50% { transform: rotate(5deg) translateY(2px); } }
@keyframes vi-bodyBounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }
@keyframes vi-legWalkL { 0%,100% { transform: rotate(0); } 50% { transform: rotate(9deg); } }
@keyframes vi-legWalkR { 0%,100% { transform: rotate(0); } 50% { transform: rotate(-9deg); } }
@keyframes vi-blink { 0%,92%,100% { transform: scaleY(1); } 96% { transform: scaleY(.12); } }
@keyframes vi-talk { from { transform: scaleY(.55); } to { transform: scaleY(1.6); } }
@keyframes vi-mouthShrug { 0%,100% { transform: scaleY(1); } 50% { transform: scaleY(.35); } }

/* wave / wave2：抬手打招呼 */
.char--wave .char__arm--r, .char--wave2 .char__arm--r { animation: vi-armWave 1.9s ease-in-out infinite; }
.char--wave .char__arm--r .char__forearm, .char--wave2 .char__arm--r .char__forearm { animation: vi-foreWave .9s ease-in-out infinite; }
.char--wave2 .char__head { animation: vi-headTilt 1.9s ease-in-out infinite .15s; }
.char--wave2 .char__body { animation: vi-bodySway 1.9s ease-in-out infinite; }
.char--wave2 .char__eyes { animation: vi-blink 3.4s ease-in-out infinite; }

/* intro：角色库点击后的自我介绍（抬手 + 摊手 + 点头 + 眨眼，多段错开） */
.char--intro .char__arm--r { animation: vi-armWave 2.2s ease-in-out infinite; }
.char--intro .char__arm--r .char__forearm { animation: vi-foreWave .9s ease-in-out infinite; }
.char--intro .char__arm--l { animation: vi-armPresentL 2.2s ease-in-out infinite .2s; }
.char--intro .char__head { animation: vi-headNod 1.6s ease-in-out infinite .3s; }
.char--intro .char__body { animation: vi-bodySway 2.2s ease-in-out infinite; }
.char--intro .char__eyes { animation: vi-blink 3.2s ease-in-out infinite; }

/* talk：说话（口型由 .is-speaking 叠加） */
.char--talk .char__arm--r .char__forearm { animation: vi-foreTalk .8s ease-in-out infinite; }
.char--talk .char__head { animation: vi-headTilt 1.6s ease-in-out infinite; }
.char.is-speaking .char__mouth { animation: vi-talk .42s ease-in-out infinite alternate; }

/* present / count / carry / cheer / shrug */
.char--present .char__arm--l { animation: vi-armPresentL 2.1s ease-in-out infinite; }
.char--present .char__arm--r { animation: vi-armPresentR 2.1s ease-in-out infinite .12s; }
.char--present .char__head { animation: vi-headTilt 2.1s ease-in-out infinite .2s; }
.char--count .char__arm--r { animation: vi-armPoint 1.2s ease-in-out infinite; }
.char--count .char__arm--r .char__forearm { animation: vi-foreCount .6s ease-in-out infinite; }
.char--count .char__head { animation: vi-headNod 1.2s ease-in-out infinite .15s; }
.char--carry .char__arm--l { animation: vi-armCarryL 2.4s ease-in-out infinite; }
.char--carry .char__arm--r { animation: vi-armCarryR 2.4s ease-in-out infinite .1s; }
.char--carry .char__body { animation: vi-bodySway 2.4s ease-in-out infinite; }
.char--cheer .char__arm--l { animation: vi-armCheerL 1.1s ease-in-out infinite; }
.char--cheer .char__arm--r { animation: vi-armCheerR 1.1s ease-in-out infinite .08s; }
.char--cheer .char__body { animation: vi-bodyBounce 1.1s ease-in-out infinite; }
.char--shrug .char__arm--l { animation: vi-armShrugL 1.8s ease-in-out infinite; }
.char--shrug .char__arm--r { animation: vi-armShrugR 1.8s ease-in-out infinite .1s; }
.char--shrug .char__head { animation: vi-headTilt 1.8s ease-in-out infinite .15s; }
.char--shrug .char__mouth { animation: vi-mouthShrug 1.8s ease-in-out infinite; }

/* point / handover / nod / walk / bow */
.char--point .char__arm--r { animation: vi-armPoint 2.2s ease-in-out infinite; }
.char--point .char__head { animation: vi-headTilt 2.2s ease-in-out infinite .2s; }
.char--handover .char__arm--r { animation: vi-armHandover 2.1s ease-in-out infinite; }
.char--handover .char__arm--l { animation: vi-armCarryL 2.1s ease-in-out infinite .12s; }
.char--nod .char__head { animation: vi-headNod 2.1s ease-in-out infinite; }
.char--walk .char__body { animation: vi-bodySway 1s ease-in-out infinite; }
.char--walk .char__leg--l { animation: vi-legWalkL 1s ease-in-out infinite; }
.char--walk .char__leg--r { animation: vi-legWalkR 1s ease-in-out infinite; }
.char--bow .char__body { animation: vi-bodyBow 2.4s ease-in-out infinite; }
.char--bow .char__head { animation: vi-headBow 2.4s ease-in-out infinite .1s; }

@media (prefers-reduced-motion: reduce) {
  .char, .char * { animation: none !important; }
}

/* ---------- 练习 ---------- */
.exercise { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 13px; margin-bottom: 10px; }
.exercise__q { font-size: 13.5px; font-weight: 650; margin-bottom: 9px; }
.exercise__opts { display: grid; gap: 7px; }
.opt {
  text-align: left; border: 1px solid var(--line); background: var(--bg); border-radius: 10px;
  padding: 9px 11px; font-size: 13px; transition: border-color .2s, background .2s;
}
.opt:hover { border-color: var(--brand); }
.opt.is-right { background: var(--green-soft); border-color: var(--green); color: var(--green); font-weight: 700; }
.opt.is-wrong { background: var(--red-soft); border-color: var(--red); color: var(--red); }
.exercise__explain { margin-top: 9px; font-size: 12px; color: var(--ink-2); background: var(--bg); padding: 8px 10px; border-radius: 9px; display: none; }
.exercise__explain.is-on { display: block; }
.match-row { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; flex-wrap: wrap; }
.match-row .left { flex: 1; min-width: 100px; font-weight: 650; font-size: 13px; }
.match-row select { border: 1px solid var(--line); border-radius: 9px; padding: 7px 9px; background: var(--bg); font-size: 13px; flex: 1; min-width: 120px; }
.match-row select.is-right { border-color: var(--green); color: var(--green); }
.match-row select.is-wrong { border-color: var(--red); color: var(--red); }
.takeaway {
  margin-top: 18px; border-radius: 15px; padding: 14px 16px;
  background: linear-gradient(120deg, var(--green-soft), transparent 90%);
  border: 1px solid color-mix(in srgb, var(--green) 26%, var(--line));
  font-weight: 700; font-size: 14px;
}
.lesson-nav { display: flex; gap: 8px; margin-top: 16px; }
.lesson-nav .btn { flex: 1; }

/* ---------- 速查 / 工具 ---------- */
.tabs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 10px; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  flex: 0 0 auto; border: 1px solid var(--line); background: var(--card); color: var(--muted);
  border-radius: 999px; padding: 6px 12px; font-size: 12px;
}
.tabs button.is-on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 700; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.tbl th, table.tbl td { padding: 8px 9px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.tbl th { color: var(--muted); font-weight: 650; font-size: 11px; background: var(--bg); position: sticky; top: 0; }
table.tbl td.vi { font-weight: 650; white-space: nowrap; }
.tbl-wrap { max-height: 460px; overflow: auto; border: 1px solid var(--line); border-radius: 13px; background: var(--card); }
.alpha-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 7px; }
.alpha-cell { background: var(--card); border: 1px solid var(--line); border-radius: 11px; padding: 9px; text-align: center; }
.alpha-cell b { font-size: 21px; display: block; line-height: 1.2; }
.alpha-cell span { font-size: 10.5px; color: var(--muted); display: block; }
.mouth-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.mouth-card { background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 10px; text-align: center; }
.mouth-card svg { width: 100%; max-width: 160px; height: auto; }
.mouth-card h4 { margin: 7px 0 2px; font-size: 12.5px; }
.mouth-card p { margin: 0; font-size: 11px; color: var(--muted); }
.role-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 9px; }
.role-cell {
  background: var(--card); border: 1px solid var(--line); border-radius: 13px;
  padding: 8px; text-align: center; cursor: pointer; position: relative;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.role-cell:hover { border-color: var(--brand); transform: translateY(-2px); }
.role-cell:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.role-cell.is-active { border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand-soft), var(--shadow); }
.role-cell__stage { position: relative; }
.role-cell svg { width: 100%; max-width: 108px; height: auto; }
.role-cell__play {
  position: absolute; left: 50%; bottom: 2px; transform: translateX(-50%);
  font-size: 9.5px; padding: 2px 8px; border-radius: 999px;
  background: rgba(17, 24, 39, .8); color: #fff; white-space: nowrap;
  opacity: 0; transition: opacity .18s ease; pointer-events: none;
}
.role-cell:hover .role-cell__play, .role-cell.is-active .role-cell__play { opacity: 1; }
.role-cell.is-active .role-cell__play { background: var(--brand); }
.role-cell p { margin: 4px 0 0; font-size: 10.5px; color: var(--muted); line-height: 1.4; }
.role-cell__outfit { display: block; margin-top: 5px; font-size: 9.5px; line-height: 1.35; color: var(--muted); }

/* 自我介绍面板：点击角色后展示越南语原文、中文、四段朗读进度与真实造型说明 */
.intro-panel {
  background: var(--card); border: 1px solid var(--brand); border-radius: 14px;
  padding: 12px 14px; margin-bottom: 12px; box-shadow: var(--shadow);
}
.intro-panel__head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.intro-panel__vi { font-size: 17px; font-weight: 700; margin-top: 9px; line-height: 1.5; }
.intro-panel__zh { font-size: 12.5px; color: var(--ink-2); }
.intro-steps { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.intro-step {
  font-size: 10.5px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); background: var(--bg);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.intro-step.is-on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 650; }
.intro-step.is-done { background: var(--green-soft); border-color: var(--green); color: var(--green); }
.intro-panel__outfit { margin-top: 10px; padding-top: 9px; border-top: 1px dashed var(--line); font-size: 11px; color: var(--muted); }
.intro-panel__outfit b { color: var(--ink-2); }
.notice { font-size: 11.5px; color: var(--muted); background: var(--bg); border: 1px dashed var(--line); border-radius: 10px; padding: 9px 11px; }

/* ---------- 反馈浮层 ---------- */
.fab {
  position: fixed; right: 16px; bottom: calc(78px + env(safe-area-inset-bottom)); z-index: 35;
  border: 0; border-radius: 999px; padding: 10px 15px; font-size: 12.5px; font-weight: 700;
  background: var(--brand); color: #fff; box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 6px;
}
.fab:active { transform: scale(.96); }
.fab svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.sheet-mask { position: fixed; inset: 0; background: rgba(15, 22, 36, .45); z-index: 40; display: none; }
.sheet-mask.is-on { display: block; }
.sheet {
  position: fixed; left: 50%; bottom: 0; transform: translateX(-50%); width: min(100%, 520px);
  background: var(--card); z-index: 41; border-radius: 20px 20px 0 0; padding: 16px 16px calc(18px + env(safe-area-inset-bottom));
  box-shadow: var(--shadow-lg); display: none;
}
.sheet.is-on { display: block; }
.sheet h3 { margin: 0 0 3px; font-size: 16px; }
.sheet__ctx { font-size: 11px; color: var(--muted); margin-bottom: 10px; line-height: 1.5; }
.sheet textarea {
  width: 100%; min-height: 84px; border: 1px solid var(--line); border-radius: 11px;
  padding: 10px; background: var(--bg); resize: vertical; font-size: 13px;
}
.sheet__tags { display: flex; gap: 6px; flex-wrap: wrap; margin: 9px 0; }
.sheet__tags button { border: 1px solid var(--line); background: var(--bg); border-radius: 999px; padding: 4px 9px; font-size: 11px; color: var(--muted); }
.sheet__tags button.is-on { background: var(--brand-soft); color: var(--brand); border-color: var(--brand); }
.sheet__row { display: flex; gap: 8px; }
.sheet__row .btn { flex: 1; }
.toast {
  position: fixed; left: 50%; bottom: 130px; transform: translateX(-50%) translateY(10px);
  background: #1B2333; color: #fff; padding: 9px 15px; border-radius: 999px; font-size: 12.5px;
  z-index: 60; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s;
}
.toast.is-on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 后台（admin.html 复用） ---------- */
.admin-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.admin-kpi { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.admin-row {
  display: flex; gap: 10px; align-items: flex-start; padding: 11px; border-bottom: 1px solid var(--line);
}
.admin-row:last-child { border-bottom: 0; }
.admin-row.is-hot { background: var(--red-soft); }
.admin-row__page { flex: 0 0 92px; font-size: 11px; color: var(--brand); font-weight: 700; word-break: break-all; }
.admin-row__body { flex: 1; min-width: 0; }
.admin-row__body p { margin: 0 0 4px; font-size: 13px; }
.admin-row__body small { color: var(--muted); font-size: 10.5px; }
.admin-row__count { font-size: 15px; font-weight: 800; color: var(--red); }
.empty { text-align: center; color: var(--muted); padding: 30px 12px; font-size: 13px; }

/* ---------- 打印（教案页/课页） ---------- */
@media print {
  .topbar, .tabbar, .fab, .sheet, .sheet-mask, .toast, .lesson-nav { display: none !important; }
  body { background: #fff; }
  main { padding: 0; }
  .card, .unit-card, .exercise { box-shadow: none; break-inside: avoid; }
  .stage { break-inside: avoid; }
}