/* ====== каркас: шапка, вкладки, задания, разбор (светлая синяя тема) ====== */
.wrap{max-width:1060px;margin:0 auto;padding:0 18px}

.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}
.topbar-inner{display:flex;align-items:center;gap:14px;padding:10px 0;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand .logo{width:40px;height:40px;border-radius:12px;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:19px;flex:none;
  box-shadow:0 6px 16px rgba(26,110,232,.32)}
.brand b{font-size:16px;white-space:nowrap}
.brand .small{white-space:nowrap}
.xp-chip{display:flex;align-items:center;gap:10px;flex:1;min-width:210px;max-width:360px}
.xp-chip .progress{flex:1}
.xp-num{font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}
.user-chip{display:flex;align-items:center;gap:9px}
.avatar{width:36px;height:36px;border-radius:12px;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;
  box-shadow:0 4px 12px rgba(26,110,232,.28)}
.tabs{display:flex;gap:6px;padding:0 0 10px;flex-wrap:wrap}
.tab-btn{border:1px solid transparent;background:transparent;border-radius:11px;padding:7px 15px;cursor:pointer;
  color:var(--muted);font-weight:500;transition:background .15s ease,color .15s ease}
.tab-btn:hover{background:#f0f4ff;color:var(--fg)}
.tab-btn.active{background:var(--grad);color:#fff;box-shadow:0 4px 12px rgba(26,110,232,.26)}

/* ---- заставка ---- */
.intro-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:16px 0}
.intro-card{padding:20px;transition:transform .18s ease, box-shadow .18s ease;position:relative;overflow:hidden}
.intro-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);opacity:.85}
.intro-card:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(24,33,58,.12)}
.intro-card .ic{font-size:26px;display:inline-flex;width:50px;height:50px;border-radius:14px;
  background:var(--primary-soft);align-items:center;justify-content:center;margin-bottom:10px;animation:popIn .5s ease both}
.intro-card h3{font-size:16px}
.intro-card p{margin:0;color:var(--muted);font-size:13.5px}
.path-strip{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:8px 0 16px}
.path-step{background:#fff;border:1px solid var(--border);border-radius:12px;padding:7px 13px;font-size:13.5px;
  display:flex;gap:7px;align-items:center;box-shadow:var(--shadow);font-weight:500}
.path-arrow{color:var(--primary);font-weight:700}

/* ---- сетка заданий ---- */
.mission-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(225px,1fr));gap:12px;margin-top:14px}
.mission-card{
  display:flex;gap:12px;align-items:center;text-align:left;padding:15px 14px;cursor:pointer;
  border:1px solid var(--border);background:#fff;border-radius:var(--radius);
  transition:transform .16s ease, box-shadow .16s ease, border-color .16s ease;position:relative;overflow:hidden;
}
.mission-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
  background:var(--grad);opacity:0;transition:opacity .16s ease}
.mission-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(24,33,58,.12);border-color:#bcd4f7}
.mission-card:hover::before{opacity:1}
.mission-card:active{transform:scale(.98)}
.mission-card .num{font-size:18px;font-weight:800;color:var(--primary);min-width:34px;font-variant-numeric:tabular-nums}
.mission-card .t{font-weight:600}
.mission-card .tag{font-size:12.5px;color:var(--muted)}
.ring{position:relative;width:44px;height:44px;flex:none}
.ring svg{transform:rotate(-90deg)}
.ring .ring-bg{stroke:#e6eaf4}
.ring .ring-val{stroke:var(--primary);stroke-linecap:round;transition:stroke-dashoffset .8s cubic-bezier(.2,.7,.3,1)}
.ring .pct{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:10.5px;font-weight:700;color:var(--muted)}

/* ---- страница задания ---- */
.mission-head{display:flex;align-items:center;gap:11px;flex-wrap:wrap;margin:16px 0 4px}
.mission-head h2{font-size:21px;margin:0}
.stage-pills{display:flex;gap:7px;margin:14px 0 16px;flex-wrap:wrap;background:#fff;border:1px solid var(--border);
  border-radius:14px;padding:7px;width:fit-content;max-width:100%;box-shadow:var(--shadow)}
.stage-pills .btn{border:none;background:transparent;box-shadow:none}
.stage-pills .btn:hover{background:#eef3fe;box-shadow:none;transform:none}
.stage-pills .btn[aria-pressed="true"]{background:var(--grad);color:#fff;box-shadow:0 4px 12px rgba(26,110,232,.26)}

/* ---- пошаговый разбор ---- */
.stepper{max-width:680px}
.stepper-track{height:6px;background:#e8ecf6;border-radius:99px;overflow:hidden;margin-bottom:18px;position:relative}
.stepper-track>div{height:100%;background:var(--grad);border-radius:99px;transition:width .45s cubic-bezier(.2,.7,.3,1)}
.step-card{padding:24px 26px 20px;display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden}
.step-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad);opacity:.9}
.step-card .ico{width:64px;height:64px;border-radius:18px;background:var(--primary-soft);
  display:flex;align-items:center;justify-content:center;font-size:34px}
.step-card .txt{font-size:16px;line-height:1.55}
.step-card kbd{background:#eef1f8;border-radius:6px;padding:1px 7px;font-family:inherit;font-size:.92em;border:1px solid var(--border);border-bottom-width:2px}
.stepper-nav{display:flex;align-items:center;gap:10px;margin-top:14px}
.dots{display:flex;gap:6px}
.dots button{width:9px;height:9px;border-radius:50%;border:none;background:#d5dbeb;cursor:pointer;padding:0;transition:transform .15s ease, background .15s ease}
.dots button.on{background:var(--primary);transform:scale(1.35)}

/* демо внутри шага */
.demo{position:relative;background:#f6f8fd;border:1px solid var(--border);border-radius:12px;padding:16px;overflow:hidden}
.demo-replay{position:absolute;top:8px;right:8px;z-index:2}
.demo svg{max-width:100%;height:auto}

/* анимации демо */
@keyframes dPop{0%{opacity:0;transform:scale(.55)}70%{transform:scale(1.1)}100%{opacity:1;transform:scale(1)}}
@keyframes dFade{from{opacity:0}to{opacity:1}}
@keyframes dOut{to{opacity:.15;transform:scale(.55) rotate(-6deg)}}
@keyframes dFlash{0%{background:#ffe9a8}100%{background:transparent}}
@keyframes dGrow{from{width:6%}}
@keyframes dMoveDot{from{left:2%}to{left:92%}}
.demo .d-el{opacity:0;animation:dPop .45s cubic-bezier(.2,.7,.3,1.2) forwards}
.demo .d-fade{opacity:0;animation:dFade .5s ease forwards}
.demo .d-out{animation:dOut .5s ease forwards}
.demo .d-flash{animation:dFlash 1s ease forwards}
.demo .d-chip{display:inline-flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--border);
  border-radius:9px;padding:3px 9px;margin:2px;font-weight:600}
.demo .d-arrow{color:var(--muted);font-weight:700}
.demo .d-note{font-size:12.5px;color:var(--muted);margin-top:8px}
.demo .d-row{display:flex;flex-wrap:wrap;align-items:center;gap:4px}
.demo .d-num{font-size:26px;font-weight:800;color:var(--primary)}

/* ---- свернутый этап ---- */
.donebar{display:flex;align-items:center;gap:10px;background:var(--accent-soft);border:1px solid #bfe8d9;
  border-radius:12px;padding:9px 14px}
.donebar .btn{padding:3px 10px;min-height:0;font-size:12.5px}

/* ---- флип-карточки ---- */
.trap-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px}
.flip{perspective:900px;flex:1;min-width:190px;max-width:280px;height:112px;cursor:pointer}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .5s cubic-bezier(.3,.7,.3,1);transform-style:preserve-3d}
.flip.open .flip-inner{transform:rotateY(180deg)}
.flip-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:12px;padding:13px 15px;
  display:flex;align-items:center;gap:9px;font-size:13.5px}
.flip-front{background:linear-gradient(135deg,#fff3d6,#ffe9c7);border:1px solid #f0d9a8;color:#7a5600;font-weight:600}
.flip-back{background:#fff;border:1px solid var(--border);transform:rotateY(180deg);color:var(--fg)}

/* ---- прочее на странице задания ---- */
.materials-box{margin-top:14px}
.materials-box a{display:inline-flex;align-items:center;gap:7px}
.qopts{display:flex;flex-direction:column;gap:7px}
.qopts .btn{width:100%;justify-content:flex-start;text-align:left;min-height:44px}