/* ============================================================
   麻将换牌顾问 · 算法演示页样式（动画为主）
   复用 style.css 的设计变量
   ============================================================ */

.explain-page .wrap{max-width:760px;}

/* ---------- 演示牌板 ---------- */
.demo-board{padding:14px 12px;}
.board-label{font-size:13px;color:var(--text-dim);margin-bottom:10px;display:flex;flex-wrap:wrap;gap:6px;align-items:baseline;}
.board-label .board-sub{font-size:11.5px;color:var(--text-faint);}
.board{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;min-height:56px;}

/* 演示用牌（比牌盘大一点，便于动画） */
.ptile{
  position:relative;width:38px;height:52px;border-radius:var(--r-sm);flex-shrink:0;
  background:linear-gradient(165deg,#fcfdfb 0%,#f0f4f1 42%,#dde6e1 100%);color:#16241f;
  box-shadow:
    0 1px 0 rgba(255,255,255,.95) inset,
    0 -2px 3px rgba(20,40,34,.14) inset,
    0 4px 10px -4px rgba(0,0,0,.6),
    0 1px 2px rgba(0,0,0,.35);
  display:flex;flex-direction:column;align-items:center;justify-content:center;font-weight:800;
  transition:transform .25s var(--ease-spring),box-shadow .3s,opacity .3s,filter .3s;
}
.ptile .num{font-size:19px;line-height:1;letter-spacing:-.5px;}
.ptile .suit-mark{font-size:9px;color:#5c6f6a;margin-top:2px;line-height:1;font-weight:700;}
.ptile.honor .num{font-size:17px;font-weight:900;}
.ptile.honor .suit-mark{display:none;}
.ptile.suit-p .num,.ptile.suit-s .num{color:#1f6b5c;}
.ptile.hono4 .num{color:#2f6ea8;}   /* 白 */
.ptile.hono5 .num{color:#1f8a5a;}   /* 发 */
.ptile.hono6 .num{color:#c0342b;}   /* 中 */
.ptile.dim{opacity:.32;filter:grayscale(.6);}

/* 分组着色 */
.ptile.g-meld{outline:2.5px solid var(--jade);outline-offset:2px;box-shadow:0 0 14px var(--glow-jade);}
.ptile.g-taatsu{outline:2.5px dashed #f0c65a;outline-offset:2px;box-shadow:0 0 10px rgba(232,195,106,.5);}
.ptile.g-pair{outline:2.5px solid #b98cff;outline-offset:2px;box-shadow:0 0 14px rgba(185,140,255,.4);}
.ptile.g-float{outline:2.5px solid var(--red);outline-offset:2px;opacity:.55;filter:grayscale(.3);}
.ptile.g-draw{outline:2.5px solid #7fd1ff;outline-offset:2px;box-shadow:0 0 12px rgba(127,209,255,.45);}
.ptile.picked{transform:translateY(-10px) scale(1.06);box-shadow:0 10px 20px rgba(0,0,0,.6);}
.ptile.removing{transform:translateY(26px) rotate(12deg) scale(.7);opacity:0;}

.board-legend{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin-top:12px;font-size:11.5px;color:var(--text-faint);}
.board-legend .lg{display:inline-block;width:20px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-2px;border:2px solid;}
.lg-meld{border-color:var(--jade);} .lg-taatsu{border-color:var(--gold);border-style:dashed;}
.lg-float{border-color:var(--red);}
.board-legend{display:none;}
.board-legend.show{display:flex;animation:fadeUp .4s both;}

/* ---------- 步骤导航（横向滑动）---------- */
.steps{
  display:flex;gap:8px;margin:16px 0 14px;overflow-x:auto;padding-bottom:4px;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;scrollbar-width:none;
  mask-image:linear-gradient(90deg,#000 90%,transparent);
  -webkit-mask-image:linear-gradient(90deg,#000 90%,transparent);
}
.steps::-webkit-scrollbar{display:none;}
.steps button{
  flex:0 0 auto;min-width:auto;padding:9px 14px;border-radius:var(--r-pill);border:1px solid var(--line);
  background:var(--bg-3);color:var(--text-faint);font-size:12.5px;font-weight:700;cursor:pointer;
  font-family:inherit;transition:.2s var(--ease-out);display:flex;gap:7px;align-items:center;white-space:nowrap;
  scroll-snap-align:center;
}
.steps button .n{
  font-size:10px;width:16px;height:16px;border-radius:50%;background:rgba(255,255,255,.08);
  display:inline-flex;align-items:center;justify-content:center;font-weight:800;
}
.steps button.active{background:linear-gradient(150deg,var(--jade-hi),var(--jade) 55%,var(--jade-deep));border-color:transparent;color:var(--jade-ink);box-shadow:0 8px 18px -10px var(--glow-jade),0 1px 0 rgba(255,255,255,.4) inset;}
.steps button.active .n{background:rgba(0,0,0,.2);}
.steps button.done{color:var(--jade-hi);border-color:rgba(47,196,174,.35);}
.steps button.done .n{background:rgba(47,196,174,.2);color:var(--jade-hi);}

/* ---------- 舞台 ---------- */
.stage{
  background:linear-gradient(160deg,rgba(255,255,255,.045),rgba(255,255,255,.012)),var(--bg-2);
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:16px 14px;min-height:220px;
}
.stage h2{font-size:16px;margin-bottom:4px;display:flex;align-items:center;gap:8px;}
.stage h2 .badge-n{
  width:22px;height:22px;border-radius:7px;flex-shrink:0;background:linear-gradient(135deg,var(--jade),#17756f);
  color:#04222b;font-size:12px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;
}
.stage .lead{font-size:13px;color:var(--text-dim);line-height:1.8;margin-bottom:15px;}
.stage .lead b{color:var(--jade-hi);}
.stage .lead .hi-gold{color:var(--gold);font-weight:700;}

/* 拆牌结果表 */
.decomp{display:flex;flex-direction:column;gap:9px;margin-bottom:8px;}
.drow{display:flex;align-items:center;gap:10px;font-size:13px;opacity:0;animation:slideIn .45s forwards;}
.drow .dlabel{width:52px;flex-shrink:0;font-size:12px;color:var(--text-faint);text-align:right;}
.drow .dval{color:var(--text);font-weight:700;font-family:ui-monospace,Consolas,monospace;font-size:13.5px;}
.drow .dval .tk{display:inline-block;padding:1px 5px;margin:1px;border-radius:5px;background:var(--bg-3);border:1px solid var(--line);}
.drow.k-meld .dval .tk{border-color:rgba(57,197,187,.5);color:var(--jade-hi);}
.drow.k-taatsu .dval .tk{border-color:rgba(232,195,106,.5);color:var(--gold);}
.drow.k-pair .dval .tk{border-color:rgba(185,140,255,.6);color:#d4bbff;}
.drow.k-float .dval .tk{border-color:rgba(230,36,41,.5);color:#ff9b9b;}

/* 公式块 */
.formula{
  background:rgba(0,0,0,.28);border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0;
  font-family:ui-monospace,Consolas,monospace;font-size:13px;color:var(--text-dim);line-height:2;
  overflow-x:auto;
}
.formula .op{color:var(--text-faint);}
.formula .big{color:var(--gold);font-weight:800;font-size:16px;}
.formula .jade{color:var(--jade-hi);font-weight:700;}
.formula .red{color:#ff9b9b;font-weight:700;}
.formula .tok{display:inline-block;min-width:22px;text-align:center;padding:0 4px;border-radius:5px;background:rgba(255,255,255,.06);}
.formula .anim{opacity:0;animation:popIn .4s forwards;}

/* 候选排名表 */
.rank{display:flex;flex-direction:column;gap:8px;}
.rrow{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;
  background:var(--bg-3);border:1px solid var(--line);opacity:0;transform:translateX(-14px);
  animation:slideRight .45s forwards;
}
.rrow.top{background:linear-gradient(135deg,rgba(232,195,106,.18),rgba(232,195,106,.04));border-color:var(--gold);}
.rrow .rk{width:20px;text-align:center;font-weight:800;color:var(--text-faint);font-size:13px;}
.rrow.top .rk{color:var(--gold);}
.rrow .rdisc{font-weight:800;font-size:15px;min-width:46px;}
.rrow .rmeta{font-size:12px;color:var(--text-dim);}
.rrow .rmeta b{color:var(--gold);}
.rrow .rbar{flex:1;height:8px;border-radius:4px;background:rgba(255,255,255,.07);overflow:hidden;min-width:40px;}
.rrow .rbar > i{display:block;height:100%;width:0;border-radius:4px;background:linear-gradient(90deg,var(--jade),var(--jade-hi));animation:grow 1s forwards;}
.rrow.top .rbar > i{background:linear-gradient(90deg,var(--gold),#ffe9a8);}
.rrow .rval{font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--text-faint);min-width:44px;text-align:right;}

/* 进张 chips */
.uk-grid{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px;}
.uk-chip{
  display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:8px;font-size:12.5px;font-weight:700;
  background:rgba(57,197,187,.12);border:1px solid rgba(57,197,187,.35);color:var(--jade-hi);
  opacity:0;transform:scale(.7);animation:popIn .35s forwards;font-family:ui-monospace,Consolas,monospace;
}
.uk-chip .rem{color:var(--text-faint);font-weight:600;font-size:11px;}

/* 结论条 */
.verdict{
  margin-top:12px;padding:14px;border-radius:12px;text-align:center;
  background:linear-gradient(135deg,rgba(232,195,106,.18),rgba(232,195,106,.03));
  border:1px solid var(--gold);animation:glowPulse 2.4s ease-in-out infinite;
}
.verdict .vt{font-size:11.5px;color:var(--gold);letter-spacing:2px;font-weight:700;}
.verdict .vm{font-size:24px;font-weight:800;color:#fff;margin:4px 0;}
.verdict .vm em{color:var(--gold);font-style:normal;}
.verdict .vs{font-size:12.5px;color:var(--text-dim);}

/* 两例对比（边界） */
.duo{display:flex;gap:12px;flex-wrap:wrap;}
.duo .dcol{flex:1;min-width:240px;background:var(--bg-3);border:1px solid var(--line);border-radius:10px;padding:12px;}
.duo .dcol .dt{font-size:12.5px;font-weight:700;margin-bottom:8px;}
.duo .dcol.ok .dt{color:var(--jade-hi);}
.duo .dcol.bad .dt{color:#ff9b9b;}
.duo .dcol .mini-board{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:8px;}
.duo .dcol .note{font-size:11.5px;color:var(--text-dim);line-height:1.6;}
.ptile.sm{width:30px;height:41px;}
.ptile.sm .num{font-size:15px;}
.ptile.sm .suit-mark{font-size:8px;}
/* 打出的牌：划叉灰显 */
.ptile.struck{opacity:.55;filter:grayscale(.5);position:relative;}
.ptile.struck::after{
  content:'';position:absolute;inset:0;margin:auto;width:80%;height:2.5px;background:#ff6b6b;
  transform:rotate(-45deg);border-radius:2px;box-shadow:0 0 6px rgba(255,80,80,.7);
}
.discard-demo{display:flex;align-items:center;gap:8px;margin-bottom:9px;flex-wrap:wrap;}
.discard-demo .dd-cap{font-size:11px;color:var(--text-faint);}
.discard-demo .dd-to{font-size:11px;color:var(--jade-hi);}
.nowrap{white-space:nowrap;}

/* 底部控制 */
.stepbar{display:flex;align-items:center;gap:10px;margin:12px 0 4px;padding-bottom:calc(env(safe-area-inset-bottom,0px));}
.stepbar .btn{flex:1;}
.stepbar #replay{flex:0 0 auto;padding:11px 14px;}
.stepbar .btn:disabled{opacity:.4;pointer-events:none;}

/* ---------- 动画关键帧 ---------- */
@keyframes popIn{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}
@keyframes slideIn{from{opacity:0;transform:translateX(-12px)}to{opacity:1;transform:translateX(0)}}
@keyframes slideRight{from{opacity:0;transform:translateX(-14px)}to{opacity:1;transform:translateX(0)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes grow{from{width:0}to{width:var(--w,60%)}}
@keyframes glowPulse{0%,100%{box-shadow:0 0 0 rgba(232,195,106,0)}50%{box-shadow:0 0 26px rgba(232,195,106,.4)}}
@keyframes flyIn{from{opacity:0;transform:translateY(-22px) scale(.8)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.anim-flyin{animation:flyIn .5s cubic-bezier(.34,1.56,.64,1) both;}
.shake{animation:shake .4s;}

/* 进度条（牌墙剩余示意） */
.wallbar{margin:10px 0;font-size:12px;color:var(--text-dim);}
.wallbar .wb-track{height:12px;border-radius:6px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:5px;}
.wallbar .wb-fill{height:100%;border-radius:6px;background:linear-gradient(90deg,var(--jade),var(--jade-hi));width:0;animation:grow 1s forwards;}

@media(max-width:420px){
  .ptile{width:33px;height:46px;} .ptile .num{font-size:17px;}
  .stage h2{font-size:15px;}
}

/* 一句话总结：流式步骤条（避免孤行） */
.verdict .flow{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:center;margin-top:6px;}
.verdict .fstep{
  font-size:12.5px;font-weight:700;padding:5px 11px 5px 6px;border-radius:999px;
  background:rgba(255,255,255,.07);border:1px solid var(--line);color:var(--text);white-space:nowrap;
  display:inline-flex;align-items:center;gap:6px;
}
.verdict .fstep i{
  font-style:normal;width:17px;height:17px;border-radius:50%;flex-shrink:0;
  background:rgba(57,197,187,.25);color:var(--jade-hi);font-size:11px;font-weight:800;
  display:inline-flex;align-items:center;justify-content:center;
}
.verdict .fstep.hot{background:linear-gradient(135deg,var(--gold),#c99b34);color:#241a02;border-color:transparent;}
.verdict .fstep.hot i{background:rgba(0,0,0,.18);color:#241a02;}

/* ---------- 自定义牌型 ---------- */
.customizer{
  margin:0 0 12px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--bg-2);overflow:hidden;
}
.customizer summary{padding:12px 14px;font-size:13.5px;font-weight:700;color:var(--jade-hi);cursor:pointer;list-style:none;}
.customizer summary::-webkit-details-marker{display:none;}
.customizer summary::after{content:'＋';float:right;opacity:.7;}
.customizer[open] summary::after{content:'－';}
.cust-body{padding:0 14px 14px;}
.hand-input{
  width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--line-strong);
  background:var(--bg-1);color:var(--text);font-size:15px;font-family:ui-monospace,Consolas,monospace;
  outline:none;transition:.18s;
}
.hand-input::placeholder{color:var(--text-faint);font-size:13px;}
.hand-input:focus{border-color:var(--jade);box-shadow:0 0 0 3px rgba(57,197,187,.15);}
.cust-hint{font-size:11.5px;color:var(--text-faint);margin:9px 2px 10px;line-height:1.5;}
.cust-hint b{color:var(--jade-hi);}
.cust-hint .cust-prev{color:var(--gold);font-family:ui-monospace,Consolas,monospace;}
.cust-actions{display:flex;gap:8px;margin-top:12px;}
.cust-actions .btn{flex:1;}
.cust-err{font-size:12px;color:#ff9b9b;margin-top:8px;min-height:16px;line-height:1.5;}