:root{color-scheme:light;--blue:#1473e6;--blue-dark:#0e5fc4;--ink:#1d232d;--muted:#6b7280;--line:#e4e7eb;--track:#edf0f3;--card:#fff;--danger:#c9363e;--success:#198754}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans",Arial,sans-serif;color:var(--ink);background:radial-gradient(circle at 50% 8%,rgba(68,77,89,.32),transparent 38%),#111418}.gate-shell{min-height:100dvh;display:grid;place-items:center;padding:24px 16px;background:rgba(6,8,11,.48);backdrop-filter:blur(5px)}.gate-card{width:min(100%,520px);background:var(--card);border-radius:8px;box-shadow:0 28px 80px rgba(0,0,0,.38);overflow:hidden}.gate-header{height:78px;display:grid;place-items:center;border-bottom:1px solid var(--line);padding:0 24px}.gate-header h1{margin:0;font-size:22px;line-height:1.2;font-weight:650;letter-spacing:-.015em}.gate-content{padding:28px 30px 30px}.puzzle-stage{position:relative;width:100%;aspect-ratio:2/1;border-radius:10px;overflow:hidden;background:#dce1e7;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08)}.puzzle-image{display:block;width:100%;height:100%;object-fit:cover;user-select:none;-webkit-user-drag:none}.target-slot,.puzzle-piece{position:absolute;width:66px;height:66px;top:50%;transform:translateY(-50%)}.target-slot{display:none}.puzzle-piece{left:14px;background-repeat:no-repeat;background-position:center;background-size:66px 66px;filter:none;opacity:1;will-change:transform,left}.refresh-button{position:absolute;right:10px;bottom:10px;width:40px;height:40px;border:0;border-radius:8px;background:rgba(18,23,29,.72);color:white;font-size:28px;line-height:1;display:grid;place-items:center;cursor:pointer;transition:background .2s,transform .2s}.refresh-button:hover{background:rgba(18,23,29,.9)}.refresh-button:active{transform:scale(.96)}.refresh-button:focus-visible,.slider-handle:focus-visible{outline:3px solid rgba(20,115,230,.34);outline-offset:3px}.stage-loading{position:absolute;inset:0;display:grid;place-items:center;background:rgba(242,245,248,.88);font-size:14px;color:#4b5563}.stage-loading[hidden]{display:none}.slider{position:relative;height:58px;margin-top:20px;border-radius:999px;background:var(--track);box-shadow:inset 0 0 0 1px #dfe3e8;overflow:hidden;touch-action:none;user-select:none}.slider-progress{position:absolute;inset:0 auto 0 0;width:0;background:linear-gradient(90deg,rgba(20,115,230,.16),rgba(20,115,230,.06));border-radius:inherit}.slider-label{position:absolute;inset:0;display:grid;place-items:center;padding:0 58px;color:#5f6771;font-size:15px;font-weight:500;pointer-events:none;transition:opacity .2s}.slider-handle{position:absolute;left:4px;top:4px;width:50px;height:50px;border:0;border-radius:50%;background:var(--blue);color:white;font-size:28px;font-weight:500;display:grid;place-items:center;cursor:grab;box-shadow:0 7px 18px rgba(20,115,230,.3);touch-action:none;will-change:transform}.slider-handle:hover{background:var(--blue-dark)}.slider-handle:active{cursor:grabbing}.gate-message{min-height:22px;margin:12px 4px 0;text-align:center;font-size:14px;color:var(--muted)}.gate-message.is-error{color:var(--danger)}.gate-message.is-success{color:var(--success)}.gate-card.is-shake{animation:shake .34s ease}.gate-card.is-success .slider{background:#e6f5eb}.gate-card.is-success .slider-handle{background:var(--success)}@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}@media(max-width:560px){.gate-shell{padding:14px 10px}.gate-card{border-radius:7px}.gate-header{height:66px}.gate-header h1{font-size:20px}.gate-content{padding:22px 16px 24px}.slider{height:56px;margin-top:16px}.slider-handle{width:48px;height:48px}.slider-label{font-size:14px;padding-left:56px;padding-right:22px}.refresh-button{width:38px;height:38px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}