/* ==========================================================================================
   screens/lobby.css — mode cards (独立/同盟), difficulty cards, create button, join panel.
   ========================================================================================== */

.lobby-body {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: .5rem;
  width: 100%;
  max-width: 19.2rem;
  margin: 0 auto;
  padding: .36rem .6rem .4rem;
  align-content: start;
}
.lobby-left, .lobby-right { display: flex; flex-direction: column; min-width: 0; }

/* ---- mode cards ------------------------------------------------------------------------------------ */
.mode-cards { display: grid; grid-template-columns: 1fr 1fr; gap: .24rem; margin-bottom: .34rem; }
.mode-card {
  --bk-c: transparent;
  --bk-l: .2rem;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .22rem;
  min-height: 4.3rem;
  padding: .34rem .32rem .3rem;
  overflow: hidden;
  text-align: left;
  background: linear-gradient(180deg, rgba(28, 34, 31, .92), rgba(13, 16, 15, .94));
  border: 1px solid var(--line);
  color: var(--text-hi);
  transition: border-color var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out), transform var(--t-fast) var(--ease-out);
  animation: card-in var(--t-slow) var(--ease-out) backwards;
}
.mode-card:nth-child(2) { animation-delay: 60ms; }
.mode-card__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 55% at 100% 0%, rgba(78, 216, 175, .10), transparent 70%),
    repeating-linear-gradient(-45deg, rgba(255, 255, 255, .018) 0 2px, transparent 2px 12px),
    linear-gradient(transparent 70%, rgba(0, 0, 0, .35));
  transition: opacity var(--t-med);
}
.mode-card::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mint-500), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-slow) var(--ease-out);
}
.mode-card__icon {
  position: relative;
  width: .88rem;
  height: .88rem;
  display: grid;
  place-items: center;
  background: #0c0f0e;
  border: 1px solid var(--line-2);
  color: var(--text-md);
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  transition: background var(--t-med), color var(--t-med);
}
.mode-card__icon .icon { width: .44rem; height: .44rem; }
.mode-card__text { position: relative; display: flex; flex-direction: column; gap: .1rem; }
.mode-card__name { font-size: .46rem; font-weight: 900; letter-spacing: .08em; line-height: 1.1; }
.mode-card__desc { font-size: .17rem; color: var(--text-lo); line-height: 1.65; max-width: 3.6rem; }
.mode-card__points { display: flex; flex-direction: column; gap: .05rem; margin-top: .06rem; font-size: .15rem; color: var(--text-md); }
.mode-card__points span::before {
  content: '';
  display: inline-block;
  width: .06rem;
  height: .06rem;
  margin: 0 .1rem .02rem 0;
  background: var(--mint-700);
  transform: rotate(45deg);
  vertical-align: middle;
}
.mode-card__check {
  position: absolute;
  top: .2rem;
  right: .2rem;
  display: flex;
  align-items: center;
  gap: .05rem;
  padding: .04rem .12rem .04rem .08rem;
  background: var(--mint-500);
  color: var(--text-on-mint);
  font-size: .14rem;
  font-weight: 700;
  opacity: 0;
  transform: translateY(-.06rem);
  transition: opacity var(--t-med), transform var(--t-med) var(--ease-out);
}
.mode-card__check .icon { width: .16rem; height: .16rem; }
.mode-card:hover { border-color: var(--line-3); --bk-c: var(--line-3); }
.mode-card:active { transform: translateY(1px); }
.mode-card.is-selected {
  --bk-c: var(--mint-400);
  border-color: var(--mint-700);
  box-shadow: 0 0 0 1px rgba(78, 216, 175, .22), 0 0 .44rem rgba(23, 249, 183, .13), inset 0 0 .7rem rgba(23, 249, 183, .05);
}
.mode-card.is-selected::before { transform: scaleX(1); }
.mode-card.is-selected .mode-card__icon { background: var(--mint-500); border-color: var(--mint-400); color: var(--text-on-mint); }
.mode-card.is-selected .mode-card__check { opacity: 1; transform: none; }
@keyframes card-in { from { opacity: 0; transform: translateY(.14rem); } }

/* ---- join panel ------------------------------------------------------------------------------------ */
.join-panel .panel__body { display: flex; flex-direction: column; gap: .14rem; padding: .22rem .26rem .18rem; }
.join-row { display: flex; gap: .16rem; align-items: stretch; }
.join-row .field { flex: 1; }
.join-row .btn { height: .64rem; }
.join-foot { display: flex; align-items: center; flex-wrap: wrap; gap: .1rem; min-height: .32rem; font-size: .14rem; }
.code-chip {
  padding: .03rem .12rem .03rem .16rem;
  border: 1px solid var(--line-2);
  background: rgba(0, 0, 0, .3);
  color: var(--amber);
  font-size: .17rem;
  font-weight: 700;
  letter-spacing: .2em;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}
.code-chip:hover { border-color: var(--amber); background: rgba(246, 163, 41, .08); }

/* ---- tips -------------------------------------------------------------------------------------------- */
.tips {
  --bk-c: var(--line-3);
  margin-top: .3rem;
  padding: .16rem .22rem .2rem;
  background: rgba(8, 10, 9, .55);
  border: 1px solid var(--line);
}
.tips__head { display: flex; align-items: center; gap: .1rem; font-size: .16rem; font-weight: 700; color: var(--text-md); }
.tips__head > .icon { width: .2rem; height: .2rem; color: var(--mint-500); }
.tips__idx { margin-left: auto; font-size: .16rem; color: var(--text-md); }
.tips__nav {
  display: grid;
  place-items: center;
  width: .3rem;
  height: .3rem;
  padding: 0;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--text-lo);
  transition: color var(--t-fast), border-color var(--t-fast);
}
.tips__nav:hover { color: var(--mint-400); border-color: var(--mint-700); }
.tips__nav .icon { width: .18rem; height: .18rem; }
.tips__text { margin-top: .1rem; font-size: .17rem; color: var(--text-lo); line-height: 1.6; animation: tip-in var(--t-slow) var(--ease-out); }
@keyframes tip-in { from { opacity: 0; transform: translateX(.1rem); } }

/* ---- difficulty cards -------------------------------------------------------------------------------- */
.diff-list { display: flex; flex-direction: column; gap: .14rem; }
.diff-card {
  --d-color: var(--amber);
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: auto auto auto;
  gap: .06rem .2rem;
  padding: .18rem .24rem .18rem .36rem;
  overflow: hidden;
  text-align: left;
  background: linear-gradient(90deg, rgba(28, 34, 31, .93), rgba(15, 19, 17, .93));
  border: 1px solid var(--line);
  color: var(--text-hi);
  transition: border-color var(--t-med), box-shadow var(--t-med), background var(--t-med);
  animation: card-in var(--t-slow) var(--ease-out) backwards;
}
.diff-card:nth-child(2) { animation-delay: 40ms; }
.diff-card:nth-child(3) { animation-delay: 80ms; }
.diff-card:nth-child(4) { animation-delay: 120ms; }
.diff-card__bar { position: absolute; left: 0; top: 0; bottom: 0; width: .06rem; background: var(--d-color); opacity: .45; transition: opacity var(--t-med), box-shadow var(--t-med); }
.diff-card__head { grid-column: 1 / -1; display: flex; align-items: center; gap: .1rem; min-width: 0; }
.diff-card__glyph { width: .28rem; height: .28rem; color: var(--d-color); filter: drop-shadow(0 0 5px var(--d-color)); filter: drop-shadow(0 0 5px color-mix(in srgb, var(--d-color) 55%, transparent)); }
.diff-card__name { font-size: .27rem; font-weight: 900; letter-spacing: .06em; color: var(--d-color); }
.diff-card__code { font-size: .14rem; color: var(--text-dim); letter-spacing: .1em; }
.diff-card__meta { margin-left: auto; display: flex; align-items: center; gap: .04rem; font-size: .14rem; color: var(--text-lo); white-space: nowrap; }
.diff-card__meta .num { color: var(--text-hi); font-weight: 700; font-size: .17rem; }
.diff-card__hidden {
  margin-left: .08rem;
  padding: 0 .07rem;
  border: 1px solid transparent; border: 1px solid color-mix(in srgb, var(--d-color) 45%, transparent);
  color: var(--d-color); color: color-mix(in srgb, var(--d-color) 80%, #fff);
  font-size: .12rem;
  line-height: 1.6;
}
.diff-card__desc { grid-column: 1; font-size: .16rem; color: var(--text-md); }
.diff-card__effects { grid-column: 1; display: flex; flex-wrap: wrap; gap: .04rem .2rem; font-size: .14rem; color: var(--text-lo); }
.diff-card__effects span::before { content: '·'; margin-right: .05rem; color: var(--d-color); font-weight: 900; }
/* battlefield pool note (config.json modes[].stages): 战场固定为 战场#01 / 战场随机（共N张） — the last item of the
   effects row (no extra card height: the lobby must not scroll at 1280×720 / 1920×1080) */
.diff-card__effects .diff-card__stage { display: inline-flex; align-self: flex-start; align-items: center; gap: .05rem; }
.diff-card__effects .diff-card__stage::before { content: none; }
.diff-card__stage .icon { flex: none; width: .15rem; height: .15rem; color: var(--d-color); opacity: .85; }
.diff-card__check {
  grid-column: 2;
  grid-row: 2 / span 2;
  align-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .03rem;
  font-size: .12rem;
  color: var(--text-dim);
}
.diff-card__check .icon {
  width: .46rem;
  height: .46rem;
  padding: .09rem;
  border-radius: 50%;
  border: 2px solid var(--line-2);
  color: transparent;
  transition: background var(--t-med), border-color var(--t-med), color var(--t-med), transform var(--t-med) var(--ease-out);
}
.diff-card__check span { opacity: 0; transition: opacity var(--t-med); }
.diff-card:hover { border-color: var(--line-3); }
.diff-card.is-selected {
  border-color: var(--d-color); border-color: color-mix(in srgb, var(--d-color) 65%, transparent);
  background: linear-gradient(90deg, #151a18, rgba(15, 19, 17, .95) 70%); background: linear-gradient(90deg, color-mix(in srgb, var(--d-color) 15%, #151a18), rgba(15, 19, 17, .95) 70%);
  box-shadow: 0 0 .3rem transparent; box-shadow: 0 0 .3rem color-mix(in srgb, var(--d-color) 16%, transparent);
}
.diff-card.is-selected .diff-card__bar { opacity: 1; box-shadow: 0 0 .14rem var(--d-color); }
.diff-card.is-selected .diff-card__check { color: var(--d-color); }
.diff-card.is-selected .diff-card__check .icon { background: var(--d-color); border-color: var(--d-color); color: #150a04; transform: rotate(-8deg); }
.diff-card.is-selected .diff-card__check span { opacity: 1; }

/* ---- create ------------------------------------------------------------------------------------------ */
.create-box { margin-top: .3rem; display: flex; flex-direction: column; gap: .12rem; }
.create-box .btn--xl { height: .92rem; font-size: .32rem; letter-spacing: .3em; }
.create-box__hint { display: flex; align-items: center; justify-content: center; min-height: .3rem; font-size: .14rem; color: var(--text-lo); }