/* ==========================================================
   瓜瓜英语 · Base Layer
   App Shell / 通用组件 / 动效
   见 .design-contract.md §4 §5
   ========================================================== */

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body { margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system,
               BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--c-ink);
  background: #E9EDF5;
  display: flex;
  justify-content: center;
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- App Shell ---------------- */

#app {
  position: relative;
  width: 100%;
  max-width: var(--app-max);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: linear-gradient(180deg, var(--c-bg-1) 0%, var(--c-bg-2) 42%, var(--c-bg-3) 100%);
  box-shadow: 0 0 46px rgba(70, 50, 110, .12);
}

.is-hidden { display: none !important; }

.screen {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 0 var(--s-4) var(--s-6);
}
.screen::-webkit-scrollbar { width: 0; }
/* tab 视图底部要给 tabbar 让位 */
#app[data-chassis="tab"] .screen { padding-bottom: calc(var(--tabbar-h) + var(--safe-b) + var(--s-4)); }

/* ---------------- 顶栏 ---------------- */

.topbar {
  position: relative;
  z-index: 20;
  flex: 0 0 auto;
  min-height: var(--topbar-h);
  padding: calc(var(--s-2) + var(--safe-t)) var(--s-4) var(--s-2);
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.topbar-title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--f-md);
  font-weight: 800;
  letter-spacing: .4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.icon-btn {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, .88);
  color: var(--c-ink);
  box-shadow: var(--sh-1);
  cursor: pointer;
  transition: transform var(--t-fast) ease;
}
.icon-btn:active { transform: scale(.9); }

.star-chip {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: var(--s-1);
  padding: 7px 13px 7px 9px;
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, #FFF3D0, #FFE3A3);
  box-shadow: var(--sh-1);
  font-size: var(--f-sm);
  font-weight: 800;
  color: #A86B00;
}
.star-chip-ico { color: var(--c-brand-2); font-size: var(--f-md); line-height: 1; }

/* ---------------- 底部导航（App Shell 的一部分，禁止视图自己改） ---------------- */

.tabbar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  display: flex;
  height: calc(var(--tabbar-h) + var(--safe-b));
  padding-bottom: var(--safe-b);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--c-line);
}

.tab {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border: none;
  background: none;
  padding: 0;
  font-family: inherit;
  font-size: var(--f-cap);
  font-weight: 700;
  color: var(--c-ink-3);
  cursor: pointer;
  transition: color var(--t-fast) ease;
}
.tab svg { width: 24px; height: 24px; }
.tab.is-active { color: var(--c-brand); }
.tab.is-active svg { transform: translateY(-1px); }
.tab:active { opacity: .65; }

/* ---------------- 按钮 ---------------- */

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 56px;
  padding: 0 var(--s-4);
  border: none;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: var(--f-md);
  font-weight: 800;
  letter-spacing: .5px;
  cursor: pointer;
  color: #fff;
  background: var(--c-card-2);
  transition: transform var(--t-fast) ease, box-shadow var(--t-fast) ease, opacity var(--t-fast) ease;
}
.btn:active { transform: scale(.96); }
.btn:disabled { opacity: .45; cursor: default; }
.btn:disabled:active { transform: none; }

.btn-primary { background: linear-gradient(135deg, var(--c-brand), var(--c-brand-2)); box-shadow: var(--sh-brand); }
.btn-ghost   { background: rgba(255, 255, 255, .92); color: var(--c-ink-2); box-shadow: var(--sh-1); }
.btn-audio   { background: linear-gradient(135deg, var(--c-sky), var(--c-grape)); box-shadow: 0 8px 18px rgba(74, 168, 255, .32); }
.btn-mic     { background: linear-gradient(135deg, var(--c-berry), #FF8FB1); box-shadow: 0 8px 18px rgba(255, 107, 157, .32); }
.btn-mint    { background: linear-gradient(135deg, var(--c-mint), #7ED957); box-shadow: 0 8px 18px rgba(47, 203, 139, .32); }

.btn-row { display: flex; gap: var(--s-3); margin-top: var(--s-4); }
.btn-row > .btn { flex: 1 1 0; }
.btn-block { width: 100%; }

/* ---------------- 卡片 ---------------- */

.card {
  background: var(--c-card);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-2);
  padding: var(--s-4);
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
  margin: var(--s-5) var(--s-1) var(--s-3);
  font-size: var(--f-md);
  font-weight: 800;
}
.section-title > span:first-child {
  display: flex;
  align-items: center;
  gap: var(--s-2);
}
.section-title > span:first-child::before {
  content: "";
  width: 5px;
  height: 17px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--c-brand), var(--c-brand-2));
}
.section-more {
  font-size: var(--f-cap);
  font-weight: 700;
  color: var(--c-ink-3);
}

/* ---------------- 徽章 ---------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  font-size: var(--f-cap);
  font-weight: 800;
  line-height: 1.6;
  background: var(--c-card-2);
  color: var(--c-ink-2);
}
.badge-real { background: var(--c-ok-bg); color: var(--c-ok); }
.badge-tts  { background: #ECEAEE; color: var(--c-ink-3); }

/* ---------------- 进度条 / 进度点 ---------------- */

.pbar {
  height: 10px;
  border-radius: var(--r-pill);
  background: #E5DFEF;
  overflow: hidden;
}
.pbar-fill {
  height: 100%;
  width: 0;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--c-brand), var(--c-brand-2));
  transition: width var(--t-slow) var(--ease-pop);
}

.dots { display: flex; justify-content: center; gap: 7px; }
.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #DDD6E8;
  transition: all var(--t-base) ease;
}
.dot.is-done { background: var(--c-brand-2); }
.dot.is-active {
  width: 26px;
  border-radius: 5px;
  background: linear-gradient(90deg, var(--c-brand), var(--c-brand-2));
}

/* ---------------- 星星 ---------------- */

.stars { display: inline-flex; gap: 2px; font-size: var(--f-xs); line-height: 1; }
.stars span { color: #DDD6E8; }
.stars span.is-on { color: var(--c-brand-2); }

/* ---------------- 选项（闯关） ---------------- */

.opt {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
  padding: var(--s-2);
  border: 3px solid transparent;
  border-radius: var(--r-md);
  background: var(--c-card-2);
  font-family: inherit;
  font-size: var(--f-lg);
  font-weight: 900;
  color: var(--c-ink);
  cursor: pointer;
  box-shadow: var(--sh-1);
  transition: transform var(--t-fast) ease, background var(--t-base) ease, border-color var(--t-base) ease;
}
.opt img { max-width: 84px; max-height: 84px; object-fit: contain; }
.opt:active { transform: scale(.95); }
.opt:disabled { cursor: default; }
.opt.is-correct { background: var(--c-ok-bg); border-color: var(--c-mint); color: var(--c-ok); animation: jump .42s ease; }
.opt.is-wrong   { background: var(--c-no-bg); border-color: var(--c-berry); color: var(--c-no); animation: shake .4s ease; }
.opt.is-dim     { opacity: .45; }

/* ---------------- 空态 ---------------- */

.empty {
  padding: var(--s-8) var(--s-4);
  text-align: center;
  color: var(--c-ink-2);
  font-size: var(--f-xs);
  font-weight: 700;
}
.empty img { width: 120px; opacity: .5; margin-bottom: var(--s-3); }

/* ---------------- Toast ---------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tabbar-h) + var(--s-6) + var(--safe-b));
  z-index: 99;
  max-width: 82vw;
  padding: var(--s-3) var(--s-5);
  border-radius: var(--r-pill);
  background: rgba(43, 33, 54, .92);
  color: #fff;
  font-size: var(--f-xs);
  font-weight: 700;
  text-align: center;
  opacity: 0;
  transform: translate(-50%, 14px);
  pointer-events: none;
  transition: opacity var(--t-base) ease, transform var(--t-base) ease;
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 撒花 ---------------- */

.confetti { position: fixed; inset: 0; z-index: 90; pointer-events: none; overflow: hidden; }
.confetti span { position: absolute; top: -8vh; font-size: 22px; animation: fall linear forwards; }

/* ---------------- 动效 ---------------- */

.fade-up { animation: fadeUp var(--t-slow) ease both; }
.pop-in  { animation: popIn var(--t-slow) var(--ease-pop) both; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes popIn {
  0%   { opacity: 0; transform: scale(.86) translateY(10px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-9px); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.07); }
}
@keyframes jump {
  0%   { transform: translateY(0); }
  45%  { transform: translateY(-9px) scale(1.04); }
  100% { transform: translateY(0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-7px); }
  45%      { transform: translateX(6px); }
  70%      { transform: translateX(-4px); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: .2; }
}
@keyframes starPop {
  0%   { opacity: 0; transform: scale(.5) rotate(-25deg); }
  70%  { opacity: 1; transform: scale(1.2) rotate(6deg); }
  100% { opacity: 1; transform: scale(1) rotate(0); }
}
@keyframes fall {
  0%   { transform: translateY(0) rotate(0); opacity: 1; }
  100% { transform: translateY(118vh) rotate(560deg); opacity: .15; }
}
@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.06); opacity: .85; }
}

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