/* 猫猫棋社 — 星夜油画 + 玻璃拟态 */
:root{
  --navy:#0a193b;
  --navy-2:#12275a;
  --gold:#f3c65b;
  --gold-2:#ffe6a5;
  --cream:#fff4d9;
  --ink:#12203d;
  --glass:rgba(11,26,60,.62);
  --glass-2:rgba(18,40,86,.52);
  --line:rgba(255,225,160,.24);
  --muted:rgba(255,240,210,.70);
  --orange:#e8b04a;
  --gray:#9dbde0;
  --shadow:0 18px 48px rgba(2,10,30,.42);
  --radius:18px;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html{background:var(--navy);scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;color:var(--cream);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
button,input,select{font:inherit}
button{cursor:pointer}
button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
img{display:block}

/* ---------- 背景 ---------- */
.bg-hero,.bg-blur,.bg-shade{position:fixed;inset:0;pointer-events:none}
.bg-hero{
  z-index:0;
  background-image:url('assets/hero.jpg');
  background-image:-webkit-image-set(url('assets/hero.webp') type('image/webp'),url('assets/hero.jpg') type('image/jpeg'));
  background-image:image-set(url('assets/hero.webp') type('image/webp'),url('assets/hero.jpg') type('image/jpeg'));
  background-size:cover;background-position:center 46%;
  transform:scale(1.015);transition:opacity .55s ease;
}
.bg-blur{
  z-index:0;opacity:0;transition:opacity .55s ease;
  background-image:url('assets/hero-blur.webp');
  background-size:cover;background-position:center;
}
.bg-shade{
  z-index:1;
  background:
    radial-gradient(ellipse 65% 60% at 50% 45%,rgba(5,14,38,.52),transparent 75%),
    linear-gradient(180deg,rgba(5,13,36,.78) 0%,rgba(5,14,38,.30) 34%,rgba(5,13,36,.60) 78%,rgba(5,12,32,.92) 100%);
}
body.in-game .bg-hero{opacity:0}
body.in-game .bg-blur{opacity:1}
body.in-game .bg-shade{
  background:linear-gradient(180deg,rgba(6,15,40,.74),rgba(6,15,40,.86));
}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(18px,4vw,52px);
  background:linear-gradient(180deg,rgba(5,14,38,.60),rgba(5,14,38,0));
}
body.in-game .topbar{display:none}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--cream)}
.brand img{width:38px;height:38px;border-radius:50%;box-shadow:0 3px 14px rgba(0,0,0,.45)}
.brand-name{font-family:"STKaiti","KaiTi","Kaiti SC","楷体",serif;font-size:22px;letter-spacing:.12em;font-weight:700}
.brand-domain{font-size:11px;letter-spacing:.14em;color:var(--muted);border-left:1px solid var(--line);padding-left:11px}
.topnav{display:flex;gap:8px;align-items:center}
.linkbtn{
  border:1px solid var(--line);background:rgba(10,24,56,.42);color:var(--cream);
  padding:8px 15px;border-radius:999px;font-size:13px;backdrop-filter:blur(8px);
  transition:.2s;
}
.linkbtn:hover{background:rgba(243,198,91,.18);border-color:rgba(243,198,91,.6)}

/* ---------- 首屏 ---------- */
.landing{position:relative;z-index:2;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:110px 20px 56px}
.hero-inner{width:100%;max-width:1120px;text-align:center}
.eyebrow{font-size:13px;letter-spacing:.30em;color:var(--gold-2);margin-bottom:16px;text-shadow:0 2px 14px rgba(0,0,0,.6)}
.eyebrow span{color:var(--gold);margin:0 8px}
.site-title{
  font-family:"STKaiti","KaiTi","Kaiti SC","楷体",serif;
  font-size:clamp(60px,10vw,124px);line-height:1.06;margin:0;
  letter-spacing:.14em;font-weight:700;
  color:#fff6da;
  text-shadow:0 3px 0 rgba(92,56,18,.45),0 12px 38px rgba(0,0,0,.62),0 0 60px rgba(243,198,91,.28);
}
.site-sub{
  margin:18px auto 28px;max-width:660px;font-size:clamp(14px,1.55vw,18px);
  line-height:1.9;color:rgba(255,246,224,.92);text-shadow:0 2px 12px rgba(0,0,0,.8);
}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:38px}
.btn{
  border:1px solid transparent;border-radius:999px;padding:13px 28px;font-size:15px;font-weight:600;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-gold{
  background:linear-gradient(135deg,#ffdd8c,#eeb445);color:#3a260a;
  box-shadow:0 10px 30px rgba(238,180,69,.38),inset 0 1px 0 rgba(255,255,255,.65);
}
.btn-gold:hover{box-shadow:0 14px 38px rgba(238,180,69,.55)}
.btn-glass{
  background:rgba(12,28,62,.52);color:var(--cream);border-color:var(--line);
  backdrop-filter:blur(10px);
}
.btn-glass:hover{background:rgba(243,198,91,.16);border-color:rgba(243,198,91,.62)}
.btn-sm{padding:9px 16px;font-size:13px}
.wide{width:100%;margin-top:14px}

.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;text-align:left}
.mode-card{
  position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:7px;
  padding:20px 19px 18px;min-height:172px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--line);color:var(--cream);
  backdrop-filter:blur(16px) saturate(1.2);box-shadow:var(--shadow);
  transition:transform .22s ease,border-color .22s ease,background .22s ease;
  overflow:hidden;
}
.mode-card::after{
  content:'';position:absolute;inset:0;opacity:0;transition:opacity .25s;
  background:radial-gradient(circle at 15% 10%,rgba(255,214,120,.22),transparent 60%);
}
.mode-card:hover{transform:translateY(-6px);border-color:rgba(243,198,91,.7);background:rgba(20,44,94,.72)}
.mode-card:hover::after{opacity:1}
.mode-cat,.mode-dual img{width:46px;height:46px;border-radius:50%}
.mode-dual{display:flex;height:46px}
.mode-dual img+img{margin-left:-16px}
.mode-icon{
  width:46px;height:46px;display:grid;place-items:center;font-size:24px;border-radius:14px;
  background:rgba(243,198,91,.14);border:1px solid var(--line);
}
.mode-title{font-size:18px;font-weight:700;letter-spacing:.06em;font-family:"STKaiti","KaiTi",serif}
.mode-desc{font-size:12.5px;line-height:1.65;color:var(--muted)}
.mode-go{margin-top:auto;font-size:12px;color:var(--gold);letter-spacing:.08em}
.hero-note{margin:26px 0 0;font-size:12px;color:rgba(255,240,210,.62);letter-spacing:.05em}

/* ---------- 简介 ---------- */
.about{position:relative;z-index:2;padding:70px 20px 40px;background:linear-gradient(180deg,rgba(5,12,32,.72),rgba(5,12,32,.94))}
.about-inner{max-width:1120px;margin:0 auto;text-align:center}
.about h2{font-family:"STKaiti","KaiTi",serif;font-size:clamp(28px,4vw,44px);margin:0 0 12px;color:#fff4d9;letter-spacing:.1em}
.about-lead{color:var(--muted);font-size:15px;margin:0 0 36px}
.about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;text-align:left}
.about-card{padding:26px 24px;border-radius:var(--radius);background:rgba(16,36,80,.46);border:1px solid var(--line)}
.about-num{font-size:12px;letter-spacing:.2em;color:var(--gold)}
.about-card h3{font-size:19px;margin:10px 0 10px;font-family:"STKaiti","KaiTi",serif}
.about-card p{font-size:13.5px;line-height:1.9;color:var(--muted);margin:0}
.about-cats{display:flex;align-items:center;justify-content:center;gap:14px;margin:44px 0 30px;flex-wrap:wrap}
.about-cats img{width:66px;height:66px;border-radius:50%;box-shadow:0 8px 24px rgba(0,0,0,.45)}
.about-cats span{font-size:14px;color:var(--cream)}
.about-cats .vs{color:var(--gold);font-size:13px;letter-spacing:.2em}
.site-footer{padding:24px 0 8px;border-top:1px solid rgba(255,225,160,.14);font-size:12px;color:rgba(255,240,210,.5)}

/* ---------- 弹窗 ---------- */
.modal{
  position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;
  padding:20px;background:rgba(4,10,28,.70);backdrop-filter:blur(9px);
  animation:fadeIn .2s ease;
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal-card{
  position:relative;width:min(480px,100%);max-height:90vh;overflow:auto;
  padding:30px 30px 26px;border-radius:22px;
  background:linear-gradient(160deg,rgba(20,44,92,.97),rgba(9,22,52,.98));
  border:1px solid rgba(255,225,160,.28);box-shadow:0 26px 70px rgba(0,0,0,.6);
  animation:popIn .25s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes popIn{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
.wide-card{width:min(760px,100%)}
.modal-close{
  position:absolute;top:12px;right:14px;width:32px;height:32px;border-radius:50%;
  border:1px solid var(--line);background:rgba(255,255,255,.06);color:var(--cream);font-size:20px;line-height:1;
}
.modal-close:hover{background:rgba(243,198,91,.22)}
.modal-kicker{font-size:11px;letter-spacing:.28em;color:var(--gold);margin-bottom:8px}
.modal-card h2{font-family:"STKaiti","KaiTi",serif;font-size:28px;margin:0 0 20px;letter-spacing:.06em}
.field{margin-bottom:18px}
.field>label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:8px;letter-spacing:.05em}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg-btn{
  flex:1;min-width:74px;padding:9px 10px;border-radius:10px;font-size:13px;
  border:1px solid rgba(255,225,160,.20);background:rgba(255,255,255,.05);color:var(--cream);
  transition:.18s;
}
.seg-btn:hover{background:rgba(255,255,255,.12)}
.seg-btn.active{background:linear-gradient(135deg,rgba(255,221,140,.95),rgba(238,180,69,.92));color:#38250a;border-color:transparent;font-weight:700}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.input{
  width:100%;padding:11px 13px;border-radius:10px;color:var(--cream);
  background:rgba(4,14,38,.6);border:1px solid rgba(255,225,160,.24);font-size:14px;
}
.input::placeholder{color:rgba(255,240,210,.42)}
select.input option{background:#12275a;color:#fff4d9}
.field-hint,.modal-hint{font-size:11.5px;line-height:1.7;color:rgba(255,240,210,.58);margin:8px 0 0}
.code-row{display:flex;gap:8px}
.code-input{letter-spacing:.28em;font-weight:700;text-transform:uppercase;font-size:18px}
.setup-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:22px;flex-wrap:wrap}
.switch{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);cursor:pointer}
.switch input{accent-color:var(--gold);width:16px;height:16px}
.room-note{font-size:12px;color:var(--muted)}
.invite-code{
  text-align:center;font-size:42px;letter-spacing:.22em;font-weight:800;color:var(--gold-2);
  padding:18px;background:rgba(4,14,38,.55);border:1px dashed rgba(243,198,91,.5);border-radius:14px;
  text-shadow:0 0 24px rgba(243,198,91,.35);
}
.invite-tip{font-size:13px;color:var(--muted);line-height:1.8}
.invite-url{
  font-size:11.5px;word-break:break-all;color:rgba(255,240,210,.72);
  background:rgba(4,14,38,.6);padding:10px 12px;border-radius:10px;border:1px solid var(--line);
  max-height:74px;overflow:auto;
}
.invite-actions,.result-actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.invite-status{margin-top:16px;font-size:13px;color:var(--gold-2);text-align:center}
.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.help-grid h3{font-size:15px;margin:0 0 6px;color:var(--gold-2)}
.help-grid p{font-size:12.5px;line-height:1.85;color:var(--muted);margin:0}
kbd{background:rgba(255,255,255,.12);border:1px solid var(--line);border-radius:4px;padding:1px 5px;font-size:11px}
.result-card{text-align:center}
.result-cats{display:flex;justify-content:center;gap:12px;margin-bottom:12px}
.result-cats img{width:78px;height:78px;border-radius:50%;animation:float 2.6s ease-in-out infinite}
.result-cats img+img{animation-delay:.7s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.result-card .result-actions{justify-content:center}
.result-card p{color:var(--muted);font-size:14px;line-height:1.8}

/* ---------- 对局界面 ---------- */
.game-view{
  position:fixed;inset:0;z-index:10;display:flex;flex-direction:column;
  background:rgba(6,16,40,.42);overflow:auto;
}
.game-head{
  display:flex;align-items:center;gap:16px;padding:12px clamp(14px,2.5vw,28px);
  border-bottom:1px solid rgba(255,225,160,.14);background:rgba(6,16,40,.62);
  backdrop-filter:blur(12px);flex:none;
}
.btn-back{
  border:1px solid var(--line);background:rgba(255,255,255,.06);color:var(--cream);
  padding:8px 14px;border-radius:999px;font-size:13px;
}
.btn-back:hover{background:rgba(243,198,91,.18)}
.game-head-title{display:flex;flex-direction:column;line-height:1.35}
.game-head-title span{font-family:"STKaiti","KaiTi",serif;font-size:19px;letter-spacing:.08em}
.game-head-title small{font-size:11px;color:var(--muted)}
.head-right{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.status-chip,.room-chip{
  display:inline-flex;align-items:center;gap:7px;font-size:12px;
  padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.06);
}
.room-chip{color:var(--gold-2);letter-spacing:.1em;font-weight:700}
.dot{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 8px var(--gold)}
.status-chip.ok .dot{background:#68d391;box-shadow:0 0 8px #68d391}
.status-chip.bad .dot{background:#fc8181;box-shadow:0 0 8px #fc8181}

.game-layout{
  display:grid;grid-template-columns:220px minmax(280px,1fr) 290px;gap:16px;
  width:100%;max-width:1460px;margin:0 auto;padding:16px clamp(12px,2vw,24px) 28px;
  align-items:start;
}
.players-col,.side-col{display:flex;flex-direction:column;gap:12px;min-width:0}
.player-card{
  display:flex;align-items:center;gap:11px;padding:12px;border-radius:14px;
  background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(12px);transition:.25s;
}
.player-card.active{border-color:rgba(243,198,91,.85);box-shadow:0 0 0 2px rgba(243,198,91,.18),0 10px 26px rgba(0,0,0,.35)}
.player-card img{width:46px;height:46px;border-radius:50%;flex:none}
.player-info{display:flex;flex-direction:column;min-width:0}
.player-info strong{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.player-info span{font-size:11px;color:var(--muted);margin-top:3px}
.player-badge{margin-left:auto;font-size:10px;color:var(--gold-2);border:1px solid var(--line);border-radius:6px;padding:3px 6px;white-space:nowrap}
.vs-mark{text-align:center;font-size:11px;color:var(--gold);letter-spacing:.18em;opacity:.8}
.info-card,.tip-card,.turn-banner,.room-box,.link-box,.log-box{
  background:var(--glass);border:1px solid var(--line);border-radius:14px;
  backdrop-filter:blur(12px);padding:14px;
}
.info-row{display:flex;justify-content:space-between;font-size:12.5px;padding:5px 0;color:var(--muted)}
.info-row b{color:var(--cream);font-variant-numeric:tabular-nums}
.tip-card{font-size:12px;line-height:1.7;color:var(--gold-2);background:rgba(243,198,91,.10)}

.board-col{min-width:0;display:flex;flex-direction:column;align-items:center;gap:10px}
.board-frame{
  width:100%;max-width:min(74vh,760px);aspect-ratio:1/1;border-radius:12px;overflow:hidden;
  border:6px solid rgba(243,198,91,.30);
  box-shadow:0 22px 60px rgba(0,0,0,.55),inset 0 0 0 1px rgba(0,0,0,.4);
  background:#d9ad68;
}
#board{width:100%;height:100%;display:block;touch-action:none;cursor:crosshair}
.board-caption{font-size:12px;color:var(--muted);text-align:center;min-height:18px}

.turn-banner{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:700;padding:12px 14px}
.turn-cat{width:30px;height:30px;border-radius:50%;background-size:cover;flex:none;box-shadow:0 2px 8px rgba(0,0,0,.4)}
.action-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.act{
  padding:10px 8px;border-radius:10px;font-size:13px;color:var(--cream);
  background:rgba(255,255,255,.06);border:1px solid var(--line);transition:.18s;
}
.act:hover{background:rgba(243,198,91,.18);border-color:rgba(243,198,91,.6)}
.act:disabled{opacity:.4;cursor:not-allowed}
.box-head{font-size:12px;color:var(--gold-2);letter-spacing:.08em;margin-bottom:8px;display:flex;justify-content:space-between}
.box-head span{color:var(--muted);font-weight:400}
.room-link{font-size:11px;word-break:break-all;color:var(--muted);line-height:1.6;max-height:48px;overflow:auto}
.room-btns{display:flex;gap:8px;margin:10px 0}
.room-btns .btn{flex:1}
.link-box p{font-size:12px;line-height:1.7;color:var(--muted);margin:0 0 10px}
.log-box{flex:1;min-height:140px;display:flex;flex-direction:column}
.move-list{
  list-style:none;margin:0;padding:0;overflow:auto;max-height:230px;flex:1;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(62px,1fr));gap:5px;align-content:start;
}
.move-list li{
  font-size:11px;padding:5px 3px;text-align:center;border-radius:6px;
  background:rgba(255,255,255,.05);color:var(--muted);font-variant-numeric:tabular-nums;
}
.move-list li b{color:var(--cream)}
.move-list li.p1{border-left:2px solid var(--orange)}
.move-list li.p2{border-left:2px solid var(--gray)}
.move-list li.latest{background:rgba(243,198,91,.22);color:#fff}
.chat-log{max-height:120px;overflow:auto;font-size:12px;line-height:1.7;margin-top:8px;display:flex;flex-direction:column;gap:4px}
.chat-log div{background:rgba(255,255,255,.05);padding:5px 8px;border-radius:8px;word-break:break-word}
.chat-log b{color:var(--gold-2)}
.chat-input{display:flex;gap:6px;margin-top:8px}
.chat-input input{flex:1;min-width:0;padding:7px 9px;border-radius:8px;background:rgba(4,14,38,.6);border:1px solid var(--line);color:var(--cream);font-size:12px}
.chat-input button{padding:7px 10px;border-radius:8px;border:1px solid var(--line);background:rgba(243,198,91,.18);color:var(--cream);font-size:12px}

.toast{
  position:fixed;left:50%;bottom:34px;z-index:100;transform:translate(-50%,20px);
  padding:11px 20px;border-radius:999px;font-size:13px;pointer-events:none;
  background:rgba(10,24,56,.94);border:1px solid rgba(243,198,91,.5);color:var(--cream);
  box-shadow:0 12px 32px rgba(0,0,0,.5);opacity:0;transition:.25s;max-width:min(90vw,520px);text-align:center;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .game-layout{grid-template-columns:190px minmax(260px,1fr) 250px;gap:12px}
  .mode-grid{grid-template-columns:repeat(2,1fr)}
  .mode-card{min-height:150px}
}
@media (max-width:900px){
  .game-layout{grid-template-columns:1fr 1fr;align-items:start}
  .board-col{grid-column:1 / -1;order:-1}
  .board-frame{max-width:min(86vw,620px)}
  .players-col,.side-col{grid-column:auto}
  .players-col{flex-direction:row;flex-wrap:wrap;align-items:stretch}
  .players-col .player-card{flex:1;min-width:150px}
  .vs-mark,.players-col .info-card,.players-col .tip-card{display:none}
  .help-grid{grid-template-columns:1fr}
}
@media (max-width:680px){
  .topbar{padding:12px 16px}
  .brand-domain{display:none}
  .linkbtn{padding:7px 11px;font-size:12px}
  .landing{padding:96px 16px 40px}
  .site-title{letter-spacing:.08em}
  .site-sub br{display:none}
  .mode-grid{grid-template-columns:1fr 1fr;gap:10px}
  .mode-card{padding:15px 13px;min-height:140px}
  .mode-title{font-size:16px}
  .mode-desc{font-size:11.5px}
  .about-grid{grid-template-columns:1fr}
  .game-layout{grid-template-columns:1fr;padding:12px}
  .players-col,.side-col{grid-column:1}
  .board-frame{border-width:4px;max-width:100%}
  .game-head{flex-wrap:wrap;padding:10px 12px}
  .game-head-title span{font-size:16px}
  .head-right{width:100%;justify-content:flex-start}
  .modal-card{padding:24px 20px}
  .invite-code{font-size:32px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}