*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root,[data-theme=sudoku-com-light]{--bg: #FFFFFF;--surface: #FFFFFF;--surface-hover: #F2F4F7;--border: #CCCCCC;--border-strong: #333333;--text: #0D0D0D;--text-dim: #666666;--text-muted: #999999;--accent: #2563EB;--accent-dim: #7EA6F6;--danger: #EF4444;--success: #22C55E;--autoplay-text: #245C63;--autoplay-bg: #E5F3F2;--autoplay-border: #78B4AD;--hard-skill-text: #6D28D9;--hard-skill-bg: #F3E8FF;--hard-skill-border: #A78BFA;--cell-bg: #FFFFFF;--cell-given: #0B2447;--cell-user: #2563EB;--cell-selected: #7EA6F6;--cell-peer: #D1E2FF;--cell-conflict: #FCA5A5;--hint-target-bg: #F3E8FF;--hint-target-text: #581C87;--hint-target-border: #A855F7;--hint-target-ring: #E9D5FF;--hint-danger-bg: #FCE7F3;--hint-danger-text: #831843;--hint-danger-border: #DB2777;--hint-danger-ring: #FBCFE8;--hint-core-bg: #FEF3C7;--hint-core-text: #92400E;--hint-core-border: #F59E0B;--hint-core-ring: #FDE68A;--hint-branch-bg: #EDE9FE;--hint-branch-text: #5B21B6;--hint-branch-border: #7C3AED;--hint-branch-ring: #DDD6FE;--hint-link-strong: #0F766E;--hint-link-weak: #D97706;--chain-a-bg: #FECACA;--chain-a-text: #991B1B;--chain-a-border: #EF4444;--chain-b-bg: #BFDBFE;--chain-b-text: #1E40AF;--chain-b-border: #2563EB;--chain-c-bg: #BBF7D0;--chain-c-text: #166534;--chain-c-border: #16A34A;--icon-filter: none;--controls-area-height: calc(112px + max(80px, env(safe-area-inset-bottom, 40px))) }[data-theme=midnight]{--bg: #0F172A;--surface: #1E293B;--surface-hover: #334155;--border: #334155;--border-strong: #94A3B8;--text: #F8FAFC;--text-dim: #94A3B8;--text-muted: #64748B;--accent: #3B82F6;--accent-dim: #1E3A8A;--danger: #EF4444;--success: #22C55E;--autoplay-text: #A7F3D0;--autoplay-bg: #164E4A;--autoplay-border: #34D399;--hard-skill-text: #DDD6FE;--hard-skill-bg: #3B276B;--hard-skill-border: #8B5CF6;--cell-bg: #1E293B;--cell-given: #F8FAFC;--cell-user: #60A5FA;--cell-selected: #1E3A8A;--cell-peer: #172554;--cell-conflict: #7F1D1D;--hint-target-bg: #4C1D95;--hint-target-text: #F5F3FF;--hint-target-border: #C4B5FD;--hint-target-ring: #8B5CF6;--hint-danger-bg: #831843;--hint-danger-text: #FCE7F3;--hint-danger-border: #F472B6;--hint-danger-ring: #9D174D;--hint-core-bg: #78350F;--hint-core-text: #FEF3C7;--hint-core-border: #FBBF24;--hint-core-ring: #92400E;--hint-branch-bg: #5B21B6;--hint-branch-text: #EDE9FE;--hint-branch-border: #C4B5FD;--hint-branch-ring: #7C3AED;--hint-link-strong: #5EEAD4;--hint-link-weak: #FBBF24;--icon-filter: invert(1) brightness(1.35)}[data-theme=midnight],[data-theme=night-mode]{--chain-a-bg: #7F1D1D;--chain-a-text: #FECACA;--chain-a-border: #F87171;--chain-b-bg: #1E3A8A;--chain-b-text: #BFDBFE;--chain-b-border: #60A5FA;--chain-c-bg: #14532D;--chain-c-text: #BBF7D0;--chain-c-border: #4ADE80}[data-theme=cobalt]{--bg: #F3F4F6;--surface: #FFFFFF;--surface-hover: #F9FAFB;--border: #D1D5DB;--border-strong: #1F2937;--text: #111827;--text-dim: #4B5563;--text-muted: #6B7280;--accent: #2563EB;--accent-dim: #BFDBFE;--danger: #DC2626;--success: #16A34A;--autoplay-text: #155E75;--autoplay-bg: #E0F2FE;--autoplay-border: #38BDF8;--cell-bg: #FFFFFF;--cell-given: #111827;--cell-user: #2563EB;--cell-selected: #BFDBFE;--cell-peer: #EFF6FF;--cell-conflict: #FEE2E2}[data-theme=amber]{--bg: #FEFCE8;--surface: #FFFFFF;--surface-hover: #FFFBEB;--border: #FEF08A;--border-strong: #422006;--text: #422006;--text-dim: #78350F;--text-muted: #A16207;--accent: #D97706;--accent-dim: #FDE047;--danger: #DC2626;--success: #059669;--autoplay-text: #155E75;--autoplay-bg: #ECFEFF;--autoplay-border: #67E8F9;--cell-bg: #FFFFFF;--cell-given: #422006;--cell-user: #D97706;--cell-selected: #FDE047;--cell-peer: #FEF9C3;--cell-conflict: #FEE2E2}[data-theme=crimson]{--bg: #18181B;--surface: #27272A;--surface-hover: #3F3F46;--border: #3F3F46;--border-strong: #D4D4D8;--text: #FAFAFA;--text-dim: #A1A1AA;--text-muted: #71717A;--accent: #F43F5E;--accent-dim: #881337;--danger: #FBBF24;--success: #34D399;--autoplay-text: #A7F3D0;--autoplay-bg: #064E3B;--autoplay-border: #34D399;--hard-skill-text: #E9D5FF;--hard-skill-bg: #4C1D95;--hard-skill-border: #A78BFA;--cell-bg: #27272A;--cell-given: #FAFAFA;--cell-user: #F43F5E;--cell-selected: #881337;--cell-peer: #4C0519;--cell-conflict: #78350F;--hint-target-bg: #4C1D95;--hint-target-text: #F5F3FF;--hint-target-border: #C4B5FD;--hint-target-ring: #8B5CF6;--hint-danger-bg: #831843;--hint-danger-text: #FCE7F3;--hint-danger-border: #F472B6;--hint-danger-ring: #9D174D;--hint-core-bg: #78350F;--hint-core-text: #FEF3C7;--hint-core-border: #FBBF24;--hint-core-ring: #92400E;--hint-branch-bg: #5B21B6;--hint-branch-text: #EDE9FE;--hint-branch-border: #C4B5FD;--hint-branch-ring: #7C3AED;--hint-link-strong: #5EEAD4;--hint-link-weak: #FBBF24;--icon-filter: invert(1) brightness(1.35)}[data-theme=eink]{--bg: #E5E5E5;--surface: #FFFFFF;--surface-hover: #F5F5F5;--border: #A3A3A3;--border-strong: #000000;--text: #000000;--text-dim: #525252;--text-muted: #737373;--accent: #000000;--accent-dim: #D4D4D4;--danger: #000000;--success: #000000;--autoplay-text: #262626;--autoplay-bg: #E5E5E5;--autoplay-border: #737373;--cell-bg: #FFFFFF;--cell-given: #000000;--cell-user: #525252;--cell-selected: #D4D4D4;--cell-peer: #F5F5F5;--cell-conflict: #D4D4D4}[data-theme=classic-light]{--bg: #f5f6fa;--surface: #ffffff;--surface-hover: #eef0f6;--border: #bfc9ca;--border-strong: #8a9ba8;--text: #232323;--text-dim: #5a6a7a;--text-muted: #8a9ba8;--accent: #3a7ca5;--accent-dim: #ffe066;--danger: #e74c3c;--success: #27ae60;--autoplay-text: #356B67;--autoplay-bg: #E5F3F2;--autoplay-border: #78B4AD;--cell-bg: #ffffff;--cell-given: #232323;--cell-user: #3a7ca5;--cell-selected: #e1e7ef;--cell-peer: #eef2f7;--cell-conflict: #fde8e8}[data-theme=night-mode]{--bg: #18181a;--surface: #22223b;--surface-hover: #2e2e4a;--border: #454459;--border-strong: #6b6a80;--text: #f5f5f7;--text-dim: #a0a0b5;--text-muted: #6b6a80;--accent: #e84855;--accent-dim: #eba834;--danger: #e84855;--success: #2ecc71;--autoplay-text: #A5F3FC;--autoplay-bg: #164E63;--autoplay-border: #22D3EE;--hard-skill-text: #DDD6FE;--hard-skill-bg: #3B276B;--hard-skill-border: #8B5CF6;--cell-bg: #22223b;--cell-given: #f5f5f7;--cell-user: #e84855;--cell-selected: #181828;--cell-peer: #1a1a2e;--cell-conflict: #3a1a1a;--hint-target-bg: #4C1D95;--hint-target-text: #F5F3FF;--hint-target-border: #C4B5FD;--hint-target-ring: #8B5CF6;--hint-danger-bg: #831843;--hint-danger-text: #FCE7F3;--hint-danger-border: #F472B6;--hint-danger-ring: #9D174D;--hint-core-bg: #78350F;--hint-core-text: #FEF3C7;--hint-core-border: #FBBF24;--hint-core-ring: #92400E;--hint-branch-bg: #5B21B6;--hint-branch-text: #EDE9FE;--hint-branch-border: #C4B5FD;--hint-branch-ring: #7C3AED;--hint-link-strong: #5EEAD4;--hint-link-weak: #FBBF24;--icon-filter: invert(1) brightness(1.35)}[data-theme=pastel-soft]{--bg: #fcf6f5;--surface: #ffffff;--surface-hover: #faf3f0;--border: #e7d8c9;--border-strong: #c4b0a0;--text: #635d5c;--text-dim: #8a8280;--text-muted: #b0a8a5;--accent: #75a6a1;--accent-dim: #f7c59f;--danger: #d48a7a;--success: #75a6a1;--autoplay-text: #356B67;--autoplay-bg: #E5F4EF;--autoplay-border: #8CC9BD;--cell-bg: #ffffff;--cell-given: #635d5c;--cell-user: #75a6a1;--cell-selected: #f1e3dd;--cell-peer: #f8efe9;--cell-conflict: #f5dad5}[data-theme=vibrant-fun]{--bg: #ffffff;--surface: #f8f9fa;--surface-hover: #f0f1f3;--border: #e0e0e0;--border-strong: #b0b0b0;--text: #333333;--text-dim: #666666;--text-muted: #999999;--accent: #2d9cdb;--accent-dim: #ffe29a;--danger: #ff7b54;--success: #2ecc71;--autoplay-text: #155E75;--autoplay-bg: #E0F2FE;--autoplay-border: #38BDF8;--cell-bg: #ffffff;--cell-given: #333333;--cell-user: #2d9cdb;--cell-selected: #ffe29a;--cell-peer: #fef7e8;--cell-conflict: #ffe0d6}[data-theme=minimal-green]{--bg: #f8fff4;--surface: #ffffff;--surface-hover: #f0fae8;--border: #a9c4a6;--border-strong: #7aa878;--text: #495057;--text-dim: #6b8a6a;--text-muted: #8fa88c;--accent: #27ae60;--accent-dim: #e9ffc5;--danger: #e74c3c;--success: #27ae60;--autoplay-text: #276749;--autoplay-bg: #E6F7EB;--autoplay-border: #68B984;--cell-bg: #ffffff;--cell-given: #495057;--cell-user: #27ae60;--cell-selected: #e6f9ea;--cell-peer: #f0fae8;--cell-conflict: #fde8e8}html{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}body{min-height:100dvh;min-height:100vh;overflow:hidden;overscroll-behavior:contain;background:var(--bg)}button:focus-visible,a:focus-visible,[role=switch]:focus-visible,[role=listbox] button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}button{font:inherit;color:inherit;border:none;background:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:disabled{opacity:.35;pointer-events:none}.flex{display:flex}.items-start{align-items:flex-start}.items-center{align-items:center}.items-between{justify-content:space-between}.justify-start{justify-content:flex-start}.text-center{text-align:center}.menu-screen{position:relative;display:grid;align-content:center;justify-items:center;overflow-y:auto;min-height:100dvh;padding:max(28px,calc(env(safe-area-inset-top) + 28px)) max(20px,env(safe-area-inset-right)) calc(104px + env(safe-area-inset-bottom)) max(20px,env(safe-area-inset-left))}.menu-content{display:grid;align-content:center;gap:18px;text-align:center;width:100%;max-width:360px;min-height:0;max-height:calc(100dvh - 136px);box-sizing:border-box}.menu-screen-amazing{align-content:start}.menu-screen-amazing .menu-content{align-content:start;margin-top:8px}.menu-screen-amazing .home-brand-bar{flex:0 0 56px}.menu-screen-amazing .home-brand-bar .home-brand-logo{width:32px;height:32px}.menu-screen-amazing .home-brand-bar .home-brand h1{font-size:clamp(22px,6vw,28px)}.menu-content h1{font-size:clamp(32px,9vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1.05}.home-brand{display:inline-flex;align-items:center;justify-content:center;gap:10px}.home-brand h1{margin:0;font-size:clamp(32px,9vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1.05}.home-brand-bar{display:flex;flex:0 0 72px;align-items:center;justify-content:center;width:100%}.home-brand-logo{display:block;width:48px;height:48px}.menu-sub{justify-self:center;max-width:28ch;color:var(--text-dim);font-size:15px;line-height:1.4}.diff-grid{display:grid;gap:10px}.diff-btn{width:100%;min-height:54px;border-radius:12px;background:var(--surface);border:1px solid var(--border);font-size:17px;font-weight:600;color:var(--text);box-shadow:0 1px 2px #0000000a;transition:background .15s,border-color .15s,transform .12s,box-shadow .12s}.diff-btn:active{background:var(--surface-hover);border-color:var(--accent);transform:scale(.98);box-shadow:none}.diff-btn:disabled{opacity:.5;transform:none}.home-bottom-nav{position:fixed;right:0;bottom:0;left:0;z-index:10;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));justify-content:center;width:100%;gap:4px;padding:7px max(12px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left));border-top:1px solid #D8D8DC;background:#f7f7f9f5;color-scheme:light;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:0 -2px 14px #1c1c2214}.home-nav-item{position:relative;display:grid;justify-items:center;gap:2px;min-height:50px;padding:6px 12px 5px;border:1px solid transparent;border-radius:11px;background:transparent;color:#6b6b73;font-size:12px;font-weight:600;letter-spacing:.01em;transition:background .15s,border-color .15s,color .15s,transform .12s}.home-nav-item svg{width:21px;height:21px;fill:currentColor;stroke:currentColor;stroke-width:1.8;stroke-linejoin:round}.home-nav-item:active{background:#e7e7ec;transform:scale(.97)}.home-nav-item-active{border-color:transparent;background:transparent;color:#124b3a;font-weight:700}@media(hover:hover){.diff-btn:hover:not(:disabled),.amazing-step-menu-card:hover{border-color:color-mix(in srgb,var(--accent) 48%,var(--border));box-shadow:0 3px 10px color-mix(in srgb,var(--accent) 10%,transparent)}}@media(min-width:1024px){.menu-content{max-width:820px;max-height:calc(100dvh - 136px)}.diff-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.amazing-steps-list{grid-template-columns:repeat(2,minmax(0,1fr));max-height:min(520px,calc(100dvh - 300px))}.home-bottom-nav{grid-template-columns:repeat(3,minmax(0,120px))}}@media(min-width:768px)and (max-width:1023px)and (orientation:landscape){.menu-content{max-width:820px;max-height:calc(100dvh - 136px)}.diff-grid,.amazing-steps-list{grid-template-columns:repeat(2,minmax(0,1fr))}.amazing-steps-list{max-height:min(520px,calc(100dvh - 300px))}.amazing-step-menu-card{min-height:64px;padding:12px 14px}.amazing-step-menu-challenge{min-width:92px}}@keyframes msg-drop{0%{opacity:0;transform:translate(-50%) translateY(-100%)}to{opacity:1;transform:translate(-50%) translateY(0)}}.msg{position:absolute;top:calc(44px + env(safe-area-inset-top,0px));left:50%;transform:translate(-50%);z-index:10;width:min(520px,calc(100% - 24px));max-width:none;font-size:13px;font-weight:600;padding:8px 12px 8px 10px;border-radius:8px;text-align:center;pointer-events:none;animation:msg-drop .3s ease-out;display:flex;align-items:center;gap:6px}.msg-icon{font-size:14px;flex-shrink:0;line-height:1}.msg-error{background:color-mix(in srgb,var(--danger) 10%,var(--surface));color:var(--danger);border:1px solid var(--danger);border-left:3px solid var(--danger);box-shadow:0 5px 16px color-mix(in srgb,var(--danger) 14%,transparent)}.msg-learning{background:color-mix(in srgb,var(--accent) 12%,var(--surface));color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 45%,var(--border));border-left:3px solid var(--accent);box-shadow:0 5px 16px color-mix(in srgb,var(--accent) 12%,transparent)}.msg-learning-hard{background:color-mix(in srgb,var(--hard-skill-bg) 78%,var(--surface));color:var(--hard-skill-text);border-color:var(--hard-skill-border);border-left-color:var(--hard-skill-border)}.msg-success{background:#22c55e26;color:var(--success)}.msg-info{background:#3b82f626;color:var(--accent)}.player-screen{display:flex;flex-direction:column;height:100dvh;overflow:hidden;position:relative}.footer-area{min-height:calc(96px + env(safe-area-inset-bottom,0px));padding:8px 12px env(safe-area-inset-bottom,0px);background:var(--surface);color:var(--text-dim);text-align:center}.footer-ad{width:min(100%,728px);min-height:80px;margin:0 auto}.footer-ad .adsbygoogle{min-height:80px}.player-header{display:flex;align-items:center;padding:6px 10px;padding-top:max(6px,env(safe-area-inset-top,6px));background:var(--surface);border-bottom:1px solid var(--border);position:relative}@media(max-height:749px){.player-header{padding:3px 8px;padding-top:max(3px,env(safe-area-inset-top,3px))}}.header-right{display:flex;align-items:center;gap:4px;margin-left:auto}.header-btn{width:44px;height:44px;display:grid;place-items:center;border-radius:4px;font-size:17px;flex-shrink:0}.header-btn:active{background:var(--surface-hover)}.header-btn-active{color:var(--accent);background:var(--accent-dim)}.player-title{position:absolute;left:50%;transform:translate(-50%);font-size:15px;font-weight:700;text-transform:capitalize}.autoplay-status-indicator{display:inline-flex;align-items:center;gap:6px;min-height:24px;box-sizing:border-box;padding:0 10px;border:1px solid var(--autoplay-border);border-radius:6px;background:var(--autoplay-bg);color:var(--autoplay-text);font-size:12px;font-family:inherit;font-weight:700;line-height:1;text-align:left;text-transform:none;cursor:pointer;transition:background .12s ease,border-color .12s ease,transform .12s ease}.autoplay-status-indicator-top{background:none;border:none}.autoplay-status-indicator:hover{background:color-mix(in srgb,var(--autoplay-bg) 78%,var(--autoplay-border))}.autoplay-status-indicator:active{transform:scale(.98)}.autoplay-status-dot{width:7px;height:7px;border-radius:50%;background:var(--autoplay-border);box-shadow:0 0 0 3px color-mix(in srgb,var(--autoplay-border) 22%,transparent);animation:autoplay-status-pulse 1.2s ease-in-out infinite}.autoplay-status-finished .autoplay-status-dot{animation:none}.autoplay-status-paused .autoplay-status-dot{animation-play-state:paused;opacity:.55}.autoplay-status-toggle-icon{display:grid;place-items:center;width:14px;height:14px;margin-left:2px;padding-left:5px;border-left:1px solid color-mix(in srgb,var(--autoplay-border) 55%,transparent)}@keyframes autoplay-status-pulse{50%{opacity:.45;transform:scale(.8)}}.player-status{font-size:13px;color:var(--text-dim)}.player-autoplay-status-top{position:absolute;display:flex;justify-content:center;min-height:28px;width:100%;background-color:var(--surface)}.player-autoplay-status-top .autoplay-status-indicator{cursor:default}.player-error-indicator{position:absolute;left:8px;right:0;display:flex;width:min(100%,440px);min-height:24px;color:var(--text-dim);font-size:13px;text-align:left;margin:0;top:12px}.indicator-row{display:flex;gap:4px;justify-content:space-between;align-items:center;width:min(100%,440px);max-width:none;height:40px;padding:0 2px;position:relative;overflow:hidden;box-sizing:border-box}.board-wrap>.board{order:2}.indicator-row-autoplay{position:static;justify-content:center;gap:8px;min-height:40px;padding:5px 0}.indicator-row-autoplay .indicator-autoplay-status,.indicator-row-autoplay .indicator-errors,.indicator-row-autoplay .indicator-autoplay-start{display:none}.autoplay-status-row-control{min-width:82px;justify-content:center;cursor:pointer}.autoplay-status-row-control img{width:15px;height:15px;display:block;filter:var(--icon-filter)}.hard-step-banner{position:absolute;left:50%;transform:translate(-50%);top:12px;font-size:13px;font-weight:700;color:var(--accent);background:var(--accent-dim);padding:6px 12px;border-radius:6px;animation:banner-pop .3s ease-out;max-width:min(400px,calc(100% - 24px));text-align:center;white-space:normal;line-height:1.25;z-index:5}.hard-step-banner-hard{color:var(--hard-skill-text);background:var(--hard-skill-bg);border:1px solid var(--hard-skill-border)}.autoplay-tutor{width:100%;margin:0;padding:10px 12px 0;border:1px solid var(--border);border-left:3px solid var(--autoplay-border);border-radius:16px;background:var(--surface);color:var(--text);box-sizing:border-box;box-shadow:0 4px 16px #0000001f}.tl-digit{color:var(--accent);font-weight:800}.autoplay-tutor p{margin:5px 0 0;color:var(--text-dim);font-size:13px;line-height:1.4}.cell-autoplay-related{background:color-mix(in srgb,var(--autoplay-bg) 70%,var(--cell-bg));box-shadow:inset 0 0 0 1px var(--autoplay-border)}.cell-autoplay-target{background:var(--hint-target-bg);color:var(--hint-target-text);box-shadow:inset 0 0 0 1px var(--hint-target-ring),0 0 0 2px color-mix(in srgb,var(--hint-target-border) 38%,transparent),0 0 15px color-mix(in srgb,var(--hint-target-border) 34%,transparent);z-index:1}.cell-autoplay-scan{background:color-mix(in srgb,#38BDF8 48%,var(--cell-bg));box-shadow:inset 0 0 0 2px #0284c7,0 0 0 3px color-mix(in srgb,#38BDF8 42%,transparent),0 0 14px color-mix(in srgb,#38BDF8 40%,transparent);animation:autoplay-scan-beam .42s ease-out both;transition:background .12s ease-out,box-shadow .12s ease-out;z-index:2}.cell-autoplay-scan-pattern{background:color-mix(in srgb,#FBBF24 46%,var(--cell-bg));box-shadow:inset 0 0 0 2px #d97706,0 0 0 3px color-mix(in srgb,#FBBF24 40%,transparent),0 0 14px color-mix(in srgb,#F59E0B 38%,transparent)}.cell-autoplay-scan-trail-1,.cell-autoplay-scan-trail-2,.cell-autoplay-scan-trail-3{background:color-mix(in srgb,#38BDF8 18%,var(--cell-bg));transition:background .18s ease-out,box-shadow .18s ease-out}.cell-autoplay-scan-trail-1{box-shadow:inset 0 0 0 1px color-mix(in srgb,#38BDF8 54%,transparent)}.cell-autoplay-scan-trail-2{background:color-mix(in srgb,#38BDF8 12%,var(--cell-bg))}.cell-autoplay-scan-trail-3{background:color-mix(in srgb,#38BDF8 7%,var(--cell-bg))}.board-autoplay-scanning{box-shadow:0 0 0 1px color-mix(in srgb,#38BDF8 26%,transparent),0 0 22px color-mix(in srgb,#38BDF8 12%,transparent)}@keyframes autoplay-scan-beam{0%{transform:scale(.91);filter:brightness(1.12)}55%{transform:scale(1.025)}to{transform:scale(1);filter:brightness(1)}}@keyframes banner-pop{0%{opacity:0;transform:translate(-50%) scale(.85)}to{opacity:1;transform:translate(-50%) scale(1)}}.indicator-errors{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--text-dim)}.indicator-autoplay{margin-inline:auto;width:44px;height:44px;display:grid;place-items:center;background:none;border:none;color:var(--text);border-radius:4px}.indicator-autoplay img{width:20px;height:20px;display:block;filter:var(--icon-filter)}.indicator-autoplay:active:not(:disabled){background:var(--surface-hover)}.indicator-autoplay-control{min-width:58px;height:34px;padding:0 6px;border:1px solid var(--autoplay-border);border-radius:4px;background:var(--autoplay-bg);color:var(--autoplay-text);font-size:12px;font-weight:700}.indicator-autoplay-control:active{background:var(--autoplay-border);color:var(--text)}.indicator-autoplay-icon-control{width:44px;min-width:44px;min-height:44px;padding:0;display:grid;place-items:center;border:none;background:transparent;color:var(--text)}.indicator-autoplay-icon-control img{width:18px;height:18px;display:block;filter:var(--icon-filter)}.indicator-autoplay-icon-control:active{background:var(--surface-hover)}.indicator-autoplay-actions{position:relative;display:inline-flex;align-items:center;gap:5px}.indicator-autoplay-status{position:absolute;left:50%;transform:translate(-50%);display:inline-flex;align-items:center;gap:4px}.indicator-speed-menu{position:relative}.indicator-speed-menu{display:inline-flex;align-items:center;gap:5px}.indicator-speed-label{color:var(--autoplay-text);font-size:11px;font-weight:700}.indicator-speed-trigger,.indicator-speed-menu-list button{min-height:24px;border:1px solid var(--autoplay-border);border-radius:6px;background:var(--autoplay-bg);color:var(--autoplay-text);font-size:12px;font-weight:700}.indicator-speed-trigger{min-width:66px;padding:0 7px;display:inline-flex;align-items:center;justify-content:space-between;gap:4px}.indicator-autoplay-exit{position:absolute;left:0;min-height:24px;min-width:66px;padding:0 7px;display:inline-flex;align-items:center;gap:4px;border-radius:4px;background:var(--danger-bg, #831843);color:var(--danger-text, #FCE7F3);font-size:12px;font-weight:700}.indicator-autoplay-exit:active{background:var(--autoplay-border);color:var(--text)}.indicator-autoplay-exit img{width:14px;height:14px;display:block;filter:brightness(0) saturate(100%) invert(92%) sepia(10%) saturate(780%) hue-rotate(288deg) brightness(108%) contrast(102%)}.indicator-speed-chevron{display:grid;place-items:center;width:14px;height:14px;line-height:1;margin-top:0}.indicator-speed-menu-list{position:absolute;right:0;top:calc(100% + 4px);z-index:5;display:grid;grid-template-columns:minmax(0,1fr);gap:2px;width:104px;min-width:104px;max-width:104px;padding:6px;border:1px solid var(--autoplay-border);border-radius:12px;background:var(--surface);box-shadow:0 4px 14px #00000029}.indicator-speed-menu-list button{width:100%;min-width:0;min-height:24px;padding:0 10px;display:flex;align-items:center;text-align:left;border-color:transparent;border-radius:10px;background:transparent;justify-content:flex-start;white-space:nowrap}.indicator-speed-trigger:active,.indicator-speed-menu-list button:active,.indicator-speed-option-active{background:var(--autoplay-border)!important;color:var(--text)!important}.player-body{display:flex;flex-direction:column;justify-content:center;flex:1;overflow:hidden;position:relative}.player-main-column{display:flex;flex:1;min-width:0;min-height:0;flex-direction:column}.player-main-column .board-wrap{flex:1}@media(max-width:1023px){.player-main-column{justify-content:center}.player-main-column .board-wrap{flex:0 0 auto}}.player-learning-column{position:absolute;right:0;bottom:0;left:0;z-index:20;height:var(--controls-area-height);pointer-events:none}@media(max-width:1023px){.player-learning-column{top:var(--learning-column-top, auto);bottom:0;height:auto}}.player-learning-column>*{pointer-events:auto}.player-learning-column-amazing-view{display:flex;flex-direction:column;justify-content:center;border-color:transparent;background:transparent;overflow:hidden;margin-inline:6px;gap:10px}.player-learning-column-amazing-view>.amazing-step-hint-detail{width:100%;max-width:none;flex:1;min-height:0;overflow-y:auto}.board-wrap{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:0;position:relative}.board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);width:min(calc(100vw - 8px),calc(100dvh - 220px),440px);height:min(calc(100vw - 8px),calc(100dvh - 220px),440px);border:1px solid var(--border-strong);background:var(--surface);gap:0;overflow:hidden;position:relative}@media(min-width:1024px){.player-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,420px);gap:24px;width:min(100%,1200px);margin:auto;padding:16px 24px max(16px,env(safe-area-inset-bottom))}.player-body-no-learning{grid-template-columns:minmax(0,1fr)}.player-body-no-learning .player-main-column{width:min(100%,760px);justify-self:center}.player-main-column{min-width:0;max-height:100%}.player-main-column .indicator-row{width:min(100%,560px,calc(100dvh - 220px))}.player-main-column .board-wrap{flex:1;width:min(100%,448px,calc(100dvh - 220px));max-width:448px;align-self:center}.player-main-column .controls{width:min(100%,448px);align-self:center;flex:0 0 auto}.player-main-column .board{width:100%;height:auto;aspect-ratio:1}.player-learning-column{position:relative;inset:auto;width:100%;height:auto;min-height:0;max-height:min(900px,100%);overflow-y:auto;align-self:stretch;display:flex;flex-direction:column;padding:8px;border:1px solid var(--border);border-radius:16px;background:var(--surface);pointer-events:auto}.player-learning-column .hint-manual-panel{position:relative;inset:auto;width:100%;max-width:none;margin:0}.player-learning-column .hint-fab,.player-learning-column .solving-steps-finished,.player-learning-column .solving-top-steps{position:relative;inset:auto;width:100%;height:auto;min-height:0;max-height:none;padding:0;overflow:visible;background:transparent;pointer-events:auto}.player-learning-column .hint-fab{display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:12px}.player-learning-column .solving-top-steps{display:flex;flex-direction:column;gap:8px;position:absolute;right:8px;top:8px}.player-learning-column .solving-steps,.player-learning-column .solving-top-steps .solving-steps{width:100%;max-width:none}.player-learning-column .solving-top-steps .solving-steps{height:auto}}@media(min-width:1280px){.player-body{grid-template-columns:minmax(0,760px) minmax(400px,520px);gap:32px;width:min(100%,1440px);padding:24px 32px max(24px,env(safe-area-inset-bottom))}.player-body.player-body-no-learning{grid-template-columns:minmax(0,1fr)}.player-main-column .indicator-row{width:min(100%,680px)}.player-main-column .controls{width:min(100%,448px)}.player-main-column .board-wrap{width:min(100%,448px,calc(100dvh - 300px));max-width:448px}.player-main-column .board{width:100%;height:auto;aspect-ratio:1}.player-learning-column{max-height:calc(100dvh - 96px);padding:8px;border-radius:12px}.tablet-solving-step-list{gap:10px}.tablet-solving-step-item,.tablet-solving-step-toggle{min-height:76px}.tablet-solving-step-toggle{padding:14px 16px}}@media(min-width:1024px)and (max-height:860px){.player-main-column .board-wrap{min-height:360px;width:min(100%,448px,calc(100dvh - 188px))}.player-main-column .board{min-width:360px;min-height:360px}.player-main-column .controls{min-height:0;padding-bottom:max(12px,env(safe-area-inset-bottom,12px))}.action-row,.digit-row{gap:3px}.action-btn{height:36px;min-height:36px;font-size:16px}.digit-btn{height:44px;min-height:36px}.digit-num{font-size:16px}.digit-count{font-size:8px}}@media(min-height:700px){.player-body{max-height:min(900px,calc(100dvh - 58px))}}@media(min-width:1024px){.mobile-top-review{display:none}.tablet-solving-steps{display:flex;flex:1;min-height:0;flex-direction:column;width:100%;padding-top:12px}.tablet-solving-step-list{display:grid;grid-auto-rows:max-content;align-content:start;gap:8px;flex:1;min-height:0;max-height:none;overflow-y:auto;padding:1px 4px 2px 1px;scrollbar-width:thin}.tablet-solving-step-item{min-height:84px;overflow:hidden;border:1px solid var(--border);border-radius:8px;background:color-mix(in srgb,var(--bg) 82%,var(--surface))}.tablet-solving-step-item-expanded{overflow:visible;border-color:var(--autoplay-border);background:color-mix(in srgb,var(--autoplay-bg) 28%,var(--surface));box-shadow:0 2px 10px color-mix(in srgb,var(--autoplay-border) 14%,transparent)}.tablet-solving-step-toggle{display:grid;grid-template-columns:minmax(0,1fr) 24px;gap:4px 8px;width:100%;min-height:84px;padding:14px;color:var(--text);text-align:left;cursor:pointer}.tablet-solving-step-toggle:disabled{cursor:default}.tablet-solving-step-toggle:focus-visible{outline:2px solid var(--autoplay-border);outline-offset:-2px}.tablet-solving-step-heading{display:flex;align-items:center;min-width:0;gap:7px;font-size:15px;line-height:1.2}.tablet-solving-step-heading strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tablet-solving-step-number{flex:0 0 auto;font-family:Roboto,sans-serif;color:var(--autoplay-text);font-weight:800}.tablet-solving-step-chevron{grid-column:2;grid-row:1 / span 2;align-self:center;width:20px;height:20px;color:var(--autoplay-text)}.tablet-solving-step-summary{grid-column:1;min-width:0;color:var(--text-dim);font-size:13px;line-height:1.35;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tablet-solving-step-detail{display:grid;gap:8px;padding:0 14px 14px;color:var(--text-dim);font-size:14px;line-height:1.45;overflow-wrap:anywhere;animation:tablet-step-detail-in .18s ease-out both}@keyframes tablet-step-detail-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.tablet-solving-step-detail p{margin:0}.tablet-solving-step-detail-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding-top:10px;border-top:1px solid color-mix(in srgb,var(--autoplay-border) 30%,var(--border))}.tablet-solving-step-detail-header>strong{color:var(--text)}.tablet-solving-step-detail-actions{display:inline-flex;align-items:center;gap:6px}.tablet-solving-step-recommend{display:grid;width:36px;height:36px;place-items:center;border-radius:8px;color:var(--autoplay-text);cursor:pointer}.tablet-solving-step-share{width:36px;height:36px}.tablet-solving-step-recommend:active{background:color-mix(in srgb,var(--autoplay-border) 22%,transparent)}.tablet-top-review{display:grid;gap:8px;width:100%;margin-bottom:10px}.tablet-top-review-header{color:var(--autoplay-text);font-size:13px;font-weight:800}.tablet-top-review-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}.tablet-top-review-card{display:grid;place-items:center;min-width:0;min-height:38px;padding:6px 14px;border:1px solid var(--border);border-radius:8px;background:color-mix(in srgb,var(--bg) 82%,var(--surface));color:var(--text);font-size:14px;font-weight:800;text-align:center;cursor:pointer}.tablet-top-review-card:hover,.tablet-top-review-card-active{border-color:var(--autoplay-border);background:color-mix(in srgb,var(--autoplay-bg) 32%,var(--surface))}.tablet-top-review-card:focus-visible{outline:2px solid var(--autoplay-border);outline-offset:1px}.tablet-top-review-card-heading,.tablet-top-review-card-summary{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tablet-top-review-card-heading{display:flex;align-items:center;gap:5px;color:var(--autoplay-text);font-size:12px;line-height:1.2}.tablet-top-review-card-heading>span{flex:0 0 auto;font-weight:800}.tablet-top-review-card-heading strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tablet-top-review-card-summary{color:var(--text-dim);font-size:11px;line-height:1.25}}.hint-links-overlay{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;z-index:3;pointer-events:none;overflow:visible}.hint-link{fill:none;vector-effect:non-scaling-stroke}.hint-link-strong{stroke:var(--hint-link-strong);stroke-width:2;opacity:.78;animation:hint-link-reveal .22s ease-out both}.hint-link-weak{stroke:var(--hint-link-weak);stroke-width:1.7;stroke-dasharray:3.5 3;opacity:.82;animation:hint-link-reveal .22s ease-out both}@keyframes hint-link-reveal{0%{opacity:0;stroke-dashoffset:10}to{opacity:.9;stroke-dashoffset:0}}#hint-link-weak-arrow path{fill:var(--hint-link-weak)}.cell{display:grid;place-items:center;background:var(--cell-bg);min-width:0;min-height:0;position:relative;overflow:hidden;border-right:1px solid var(--border);border-bottom:1px solid var(--border)}.cell:disabled{opacity:1}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:1px solid var(--border-strong)}.cell:nth-child(n+73){border-bottom:0}.cell:nth-child(3n):not(:nth-child(9n)){border-right:1px solid var(--border-strong)}.cell:nth-child(3n):nth-child(n+19):nth-child(-n+27),.cell:nth-child(3n):nth-child(n+46):nth-child(-n+54){border-right:1px solid var(--border-strong);border-bottom:1px solid var(--border-strong)}.cell-given .cell-value{color:var(--cell-given);font-family:Roboto,sans-serif;font-weight:500}.cell-value{color:var(--cell-user);font-family:Roboto,sans-serif;font-size:clamp(24px,8vmin,48px);line-height:1;font-weight:500}.cell-selected{background:var(--cell-selected)!important;box-shadow:inset 0 0 0 2px var(--accent);z-index:1}.cell-peer{background:var(--cell-peer)!important}.cell-match{background:var(--accent-dim)!important}.cell-conflict .cell-value,.cell-incorrect .cell-value{color:var(--danger)!important}@keyframes cell-pop{0%{transform:scale(1)}40%{transform:scale(1.25)}to{transform:scale(1)}}.cell-pop .cell-value{animation:cell-pop .2s ease-out}@keyframes cell-shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-3px)}40%,80%{transform:translate(3px)}}.cell-shake{animation:cell-shake .3s ease-in-out}@keyframes line-finish-flash{0%{opacity:0;transform:scale(.96)}20%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(1.03)}}.cell-finished-line:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border:2px solid var(--success);box-shadow:inset 0 0 0 1px var(--success);opacity:0;pointer-events:none;animation:line-finish-flash .65s ease-out}.cell-highlight-primary{background:var(--accent-dim)!important;box-shadow:inset 0 0 0 2px var(--accent);z-index:1}.cell-highlight-secondary{background:var(--cell-peer)!important}.cell-highlight-danger{background:var(--cell-conflict)!important;box-shadow:inset 0 0 0 2px var(--danger);z-index:1}.cell-manual-hint-primary{background:var(--accent-dim)!important;box-shadow:inset 0 0 0 2px var(--accent),0 0 0 1px var(--accent-dim);z-index:2}.cell-manual-hint-danger{background:var(--cell-conflict)!important;box-shadow:inset 0 0 0 2px var(--danger),0 0 0 1px var(--cell-conflict);z-index:2}.cell-autoplay-hint-primary{background:var(--hint-target-bg)!important;box-shadow:inset 0 0 0 2px var(--hint-target-border),0 0 0 1px var(--hint-target-ring);color:var(--hint-target-text);z-index:2}.cell-autoplay-hint-danger{background:var(--hint-danger-bg)!important;box-shadow:inset 0 0 0 2px var(--hint-danger-border),0 0 0 1px var(--hint-danger-ring);color:var(--hint-danger-text);z-index:2}.cell-autoplay-core{background:var(--hint-core-bg)!important;box-shadow:inset 0 0 0 2px var(--hint-core-border),0 0 0 1px var(--hint-core-ring);color:var(--hint-core-text);z-index:3}.cell-autoplay-branch{background:var(--hint-branch-bg)!important;box-shadow:inset 0 0 0 2px var(--hint-branch-border),0 0 0 1px var(--hint-branch-ring);color:var(--hint-branch-text);z-index:4}.candidates{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:98%;height:98%;color:var(--text-muted);font-family:Roboto,sans-serif;font-size:clamp(10px,3.2vmin,14px);font-weight:500;line-height:1}.candidates span{display:grid;place-items:center;min-width:0}.candidate-highlight{color:var(--accent)!important;background:var(--accent-dim)}.candidate-highlight-quick{color:var(--accent)!important;background:var(--accent-dim);border-radius:2px;box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 42%,transparent);font-weight:800}.candidate-highlight-core{color:var(--hint-core-text)!important;background:var(--hint-core-ring);border-radius:2px;font-weight:800}.candidate-highlight-branch{color:var(--hint-branch-text)!important;background:var(--hint-branch-ring);border-radius:2px;box-shadow:inset 0 0 0 1px var(--hint-branch-border);font-weight:800}.candidate-chain-a,.candidate-chain-b,.candidate-chain-c{border-radius:3px;font-weight:800;box-shadow:inset 0 0 0 1px currentColor}.candidate-chain-a{color:var(--chain-a-text)!important;background:var(--chain-a-bg)}.candidate-chain-b{color:var(--chain-b-text)!important;background:var(--chain-b-bg)}.candidate-chain-c{color:var(--chain-c-text)!important;background:var(--chain-c-bg)}.candidate-removing{color:var(--hint-danger-text)!important;font-weight:600;text-decoration:line-through;text-decoration-thickness:1px;text-decoration-color:var(--hint-danger-border);animation:candidate-remove-flash .65s ease-in-out both}@keyframes candidate-remove-flash{0%,to{opacity:.45;transform:scale(.9)}35%{opacity:1;transform:scale(1.18)}70%{opacity:.7;transform:scale(1)}}@media(prefers-reduced-motion:reduce){.autoplay-status-dot,.candidate-removing{animation:none}}.solving-steps{width:min(100%,400px);margin:2px auto 0;padding:5px 6px 2px;box-sizing:border-box;background:color-mix(in srgb,var(--autoplay-bg) 24%,var(--surface));position:relative;z-index:1}.solving-steps-strip{display:flex;gap:6px;overflow-x:auto;padding:0 1px 1px;scroll-snap-type:x proximity;scrollbar-width:thin}.autoplay-no-more-card{margin:6px 1px 2px;padding:9px 10px;border:1px solid color-mix(in srgb,#f59e0b 72%,var(--border));border-radius:10px;background:color-mix(in srgb,#fef3c7 62%,var(--surface));color:var(--text-dim);font-size:12px;line-height:1.35}.autoplay-no-more-card strong{display:block;color:color-mix(in srgb,#b45309 82%,var(--text));font-size:13px}.autoplay-status-no-more{border-color:color-mix(in srgb,#f59e0b 72%,var(--border));background:color-mix(in srgb,#fef3c7 62%,var(--surface));color:color-mix(in srgb,#92400e 82%,var(--text))}.autoplay-status-no-more .autoplay-status-dot{background:#f59e0b}.autoplay-no-more-card p{margin:3px 0 0}@media(min-width:1024px){.tablet-solving-step-list .autoplay-no-more-card{margin:0}}.solving-step-card{flex:0 0 132px;min-height:43px;display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:5px 7px;border:1px solid var(--border);border-radius:9px;background:color-mix(in srgb,var(--bg) 82%,var(--surface));color:var(--text);text-align:left;scroll-snap-align:start;transition:border-color .12s ease,background .12s ease,transform .12s ease}.solving-step-card:not(:disabled):hover{border-color:color-mix(in srgb,var(--autoplay-border) 60%,var(--border));background:var(--surface)}.solving-step-card:not(:disabled):active{transform:scale(.98)}.solving-step-tutorial{display:inline-flex;align-items:center;gap:4px;width:fit-content;height:22px;min-height:22px;padding:2px 8px;box-sizing:border-box;border:1px solid color-mix(in srgb,var(--autoplay-border) 55%,var(--border));border-radius:999px;color:var(--autoplay-text);font-size:12px;font-weight:700;text-decoration:none}.solving-step-tutorial:hover{background:color-mix(in srgb,var(--autoplay-border) 18%,transparent)}.solving-step-card:focus-visible{outline:2px solid var(--autoplay-border);outline-offset:1px}.solving-step-card-active{border-color:var(--autoplay-border);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--autoplay-border) 72%,transparent);background:color-mix(in srgb,var(--autoplay-bg) 78%,var(--surface))}.solving-step-number{font-family:Roboto,sans-serif;color:var(--autoplay-text);font-size:10px;font-weight:700}.solving-step-meta{display:flex;align-items:baseline;gap:4px;min-width:0;max-width:100%}.solving-step-meta .solving-step-number:after{content:" ·"}.solving-step-card strong{color:var(--autoplay-text);font-size:11px;line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.solving-step-summary{color:var(--text-dim);font-size:10px;line-height:1.25;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.solving-step-detail{position:relative;min-height:96px;max-height:96px;margin-bottom:6px;padding:8px 10px 9px;border:1px solid color-mix(in srgb,var(--autoplay-border) 32%,var(--border));border-radius:10px;background:color-mix(in srgb,var(--autoplay-bg) 42%,var(--surface));color:var(--text-dim);font-size:12px;line-height:1.4}.solving-step-detail-actions{display:inline-flex;align-items:center;gap:6px;flex-shrink:0}.solving-step-detail strong{color:var(--text)}.solving-step-detail p{margin:4px 0 0}.solving-step-share{display:grid;place-items:center;width:28px;height:28px;padding:0;color:var(--text-dim);font-size:11px;font-weight:700}.solving-step-share:active{background:var(--surface-hover);color:var(--text)}.solving-step-share:disabled{opacity:.35;cursor:default}.solving-step-recommend,.tablet-solving-step-share{display:grid;place-items:center;width:28px;height:28px;padding:0;border-radius:7px;color:var(--autoplay-text)}.solving-step-recommend:active,.tablet-solving-step-share:active{background:var(--surface-hover)}.solving-step-recommend-recommended,.tablet-solving-step-recommend-recommended{background:color-mix(in srgb,var(--autoplay-border) 28%,transparent);color:var(--autoplay-text)}.spin{animation:spin .8s linear infinite}.amazing-steps-menu{width:100%;max-width:420px;margin-top:4px;padding-top:18px;border-top:1px solid var(--border)}.amazing-steps-menu h2{margin:0 0 10px;color:var(--text);font-size:18px;font-weight:700;letter-spacing:-.01em}.amazing-step-filters{display:flex;gap:8px;align-items:end}.amazing-steps-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.amazing-step-filters label{display:flex;align-items:center;gap:6px;min-width:0;color:var(--text-dim);font-size:11px;font-weight:700;white-space:nowrap}.amazing-step-filters select{width:auto;min-width:80px;min-height:28px;padding:0 6px;border:1px solid var(--border);border-radius:6px;background:var(--surface);color:var(--text);font:inherit;font-size:12px}.amazing-steps-list{display:grid;gap:8px;max-height:max(240px,min(480px,calc(100dvh - 240px)));overflow-y:auto;padding-right:4px}.amazing-step-menu-card{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;width:100%;min-height:56px;padding:11px 14px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--text);text-align:left;box-shadow:0 1px 2px #0000000a;transition:background .12s,border-color .12s,transform .12s,box-shadow .12s}.amazing-step-menu-view{overflow:hidden}.amazing-step-menu-card:has(.amazing-step-menu-view:active){background:var(--surface-hover);border-color:var(--accent);transform:scale(.98);box-shadow:none}.amazing-step-menu-view{display:flex;width:100%;min-width:0;flex:1;flex-direction:column;align-items:flex-start;gap:2px;padding:0;border:0;background:transparent;color:inherit;text-align:left}.amazing-step-menu-view strong{display:inline-flex;align-items:center;gap:5px}.amazing-step-completed-mark{display:inline-grid;width:18px;height:18px;place-items:center;border-radius:50%;background:#1f8a70;color:#fff!important;font-size:12px!important;font-weight:800!important}.amazing-step-menu-challenge{flex:0 0 auto;min-height:32px;padding:0 10px;border:1px solid var(--autoplay-border);border-radius:8px;background:var(--autoplay-bg);color:var(--autoplay-text);font-size:12px;font-weight:700}.amazing-step-menu-challenge:active{background:var(--autoplay-border);color:var(--text)}.amazing-step-menu-card strong{display:block;max-width:100%;font-size:15px;font-weight:600;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.amazing-step-menu-card span{display:block;max-width:100%;overflow:hidden;text-overflow:ellipsis;color:var(--text-dim);font-size:12px;white-space:nowrap}.amazing-step-menu-card .amazing-step-completed-mark{display:inline-grid;max-width:none;overflow:visible;text-overflow:clip}@media(min-width:1024px){.amazing-steps-menu{max-width:820px}.amazing-step-menu-card{min-height:64px;padding:12px 14px}.amazing-step-menu-challenge{min-width:92px}}@media(min-width:768px)and (max-width:1023px)and (orientation:landscape){.amazing-steps-menu{max-width:820px}}.amazing-step-panel{width:min(100%,400px);margin:0 auto;padding:14px;border:1px solid var(--autoplay-border);border-radius:16px;background:color-mix(in srgb,var(--autoplay-bg) 28%,var(--surface));color:var(--text);box-sizing:border-box;box-shadow:0 4px 16px color-mix(in srgb,var(--autoplay-border) 12%,transparent)}.amazing-step-hint-detail{width:min(100%,400px);margin:0 auto;padding:14px;border:1px solid color-mix(in srgb,var(--autoplay-border) 48%,var(--border));border-radius:12px;background:color-mix(in srgb,var(--autoplay-bg) 28%,var(--surface));color:var(--text-dim);font-size:14px;line-height:1.45;box-sizing:border-box}.amazing-step-hint-detail-header{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--text);font-size:16px}.amazing-step-hint-detail-header>span{color:var(--autoplay-text);font-weight:800}.amazing-step-hint-detail p{margin:8px 0 0}.amazing-step-link-details{margin-top:16px;padding-top:12px;border-top:1px solid color-mix(in srgb,var(--autoplay-border) 24%,var(--border));color:var(--text)}.amazing-step-link-details>strong{display:block;color:var(--autoplay-text);font-size:13px}.amazing-step-link-details p{margin:6px 0 0;color:var(--text-dim);font-size:13px}.amazing-step-link-details ul{display:grid;gap:6px;margin:8px 0 0;padding-left:18px}.amazing-step-link-details li{font-size:13px;line-height:1.4}.amazing-step-link-strong::marker{color:var(--hint-link-strong)}.amazing-step-link-weak::marker{color:var(--hint-link-weak)}.amazing-step-hint-detail-status{color:var(--autoplay-text);font-weight:700}.amazing-step-feedback{display:flex;justify-content:center;gap:8px;margin-top:14px;padding-top:10px;border-top:1px solid color-mix(in srgb,var(--autoplay-border) 24%,var(--border))}.amazing-step-navigation{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}.amazing-step-navigation button{min-height:34px;padding:0 8px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font-size:12px;font-weight:700}.amazing-step-navigation button:disabled{cursor:default;opacity:.4}.amazing-feedback-button{display:inline-flex;align-items:center;gap:4px;min-width:34px;min-height:30px;padding:0 7px;border:1px solid var(--border);border-radius:8px;background:var(--surface);font-size:13px;font-weight:700;color:var(--text-dim)}.amazing-feedback-button img{width:16px;height:16px;object-fit:contain}@media(min-width:1024px){.player-learning-column .amazing-step-hint-detail{width:100%;max-width:none}}.amazing-feedback-selected{border-color:var(--autoplay-border);background:color-mix(in srgb,var(--autoplay-bg) 55%,var(--surface))}.amazing-step-panel-heading{display:flex;flex-direction:column;gap:3px}.amazing-step-panel-kicker{color:var(--autoplay-text);font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.amazing-step-panel p{margin:8px 0 0;color:var(--text-dim);font-size:13px;line-height:1.45}.amazing-step-panel-result{color:var(--autoplay-text)!important;font-weight:700}.amazing-step-panel-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.amazing-step-panel-primary,.amazing-step-panel-secondary{min-height:36px;padding:0 12px;border-radius:9px;font-size:13px;font-weight:700}.amazing-step-pagination{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:12px}.amazing-step-pagination button{min-height:32px;padding:0 10px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font-size:12px;font-weight:700}.amazing-step-pagination button:disabled{cursor:default;opacity:.45}.amazing-step-pagination span{min-width:18px;color:var(--text-dim);font-size:12px;font-weight:700;text-align:center}.amazing-step-panel-primary{border:1px solid var(--autoplay-border);background:var(--autoplay-border);color:var(--text)}.amazing-step-panel-secondary{border:1px solid var(--autoplay-border);background:transparent;color:var(--autoplay-text)}.controls{position:relative;z-index:1;order:3;width:min(100%,440px);align-self:center;min-height:var(--controls-area-height);background:var(--surface);padding:0 6px;padding-bottom:max(40px,env(safe-area-inset-bottom,40px));display:grid}.action-row{display:grid;grid-template-columns:repeat(5,1fr);align-items:center;gap:4px}.action-btn{height:44px;min-height:44px;border-radius:4px;background:var(--bg);border:1px solid var(--border);font-size:18px;font-weight:700;color:var(--text-dim);transition:background .1s}.action-btn:active:not(:disabled){background:var(--surface-hover);border-color:var(--accent)}.action-restart{color:var(--danger)}.quick-active{color:var(--accent)!important;border-color:var(--accent)!important;background:var(--accent-dim)!important}.digit-row{display:grid;grid-template-columns:repeat(9,1fr);align-items:center;gap:5px}.digit-btn{height:60px;min-height:40px;border-radius:4px;background:var(--bg);border:1px solid var(--border);font-size:20px;font-weight:700;color:var(--text);transition:background .1s,border-color .1s;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px}.digit-btn:active:not(:disabled){background:var(--surface-hover);border-color:var(--accent)}.digit-hidden{visibility:hidden;pointer-events:none}.digit-active{border-color:var(--accent)!important;background:var(--accent-dim)!important}.digit-num{font-size:18px;line-height:1}.digit-count{font-size:9px;font-weight:400;line-height:1;opacity:.5}.hint-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:flex;align-items:flex-end;justify-content:center}.hint-section{position:absolute;left:12px;right:12px;bottom:max(4px,env(safe-area-inset-bottom));width:auto;max-width:400px;margin:0 auto;box-sizing:border-box;display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:10px 12px;box-shadow:0 4px 16px #0000001f;animation:slideUp .25s ease-out}.hint-fab{position:absolute;left:0;right:0;top:0;z-index:20;height:var(--controls-area-height);max-width:none;margin:0 auto;padding:0px 2px max(40px,env(safe-area-inset-bottom,40px));box-sizing:border-box;align-content:flex-start;background:var(--surface);display:flex;flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:4px 6px}.hint-manual-panel{position:absolute;left:12px;right:12px;bottom:max(8px,env(safe-area-inset-bottom));z-index:10;max-width:400px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;gap:8px}.hint-manual-panel .autoplay-tutor{flex-basis:100%}.solving-steps-finished{position:absolute;top:0;left:0;right:0;z-index:5;padding:2px 0 4px;box-sizing:border-box;background:var(--surface)}.solving-steps-close{position:absolute;top:1px;right:max(6px,calc((100% - 400px)/2 + 6px));z-index:2;display:grid;width:24px;height:24px;place-items:center;padding:0;border:0;border-radius:50%;background:#c1bfbf;color:var(--text);cursor:pointer}.solving-steps-close:hover{color:var(--text);background:color-mix(in srgb,var(--autoplay-border) 30%,var(--surface))}.solving-top-steps{position:absolute;top:-10px;right:6px;z-index:6;pointer-events:none}.solving-steps:has(.solving-step-detail) .solving-top-steps{top:92px}.tablet-top-review-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;pointer-events:auto;max-width:160px;margin-left:auto}.tablet-top-review-card{display:grid;min-width:0;min-height:17px;place-items:center;padding:1px 4px;border:1px solid var(--border);border-radius:5px;background:color-mix(in srgb,var(--bg) 82%,var(--surface));color:var(--text);font-size:9px;font-weight:800;text-align:center;cursor:pointer}.tablet-top-review-card:hover,.tablet-top-review-card-active{border-color:var(--autoplay-border);background:color-mix(in srgb,var(--autoplay-bg) 32%,var(--surface))}.tablet-top-review-card:focus-visible{outline:2px solid var(--autoplay-border);outline-offset:1px}.solving-steps-finished .solving-steps{margin:0 auto;max-height:240px;overflow-y:auto}.hint-btn{height:36px;min-height:36px;border-radius:10px;font-size:14px;font-weight:700;background:var(--accent);color:#fff;border:1px solid var(--accent);transition:opacity .15s,transform .15s;display:inline-flex;align-items:center;gap:6px;padding:0 14px;box-shadow:0 2px 12px color-mix(in srgb,var(--accent) 30%,transparent);flex:1 1 0;justify-content:center;min-width:0}.hint-btn:active:not(:disabled){opacity:.85;transform:scale(.97)}.hint-btn-secondary{background:var(--bg);color:var(--text);border-color:var(--border);box-shadow:0 2px 8px color-mix(in srgb,var(--border) 20%,transparent)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}}.hint-body{display:grid;gap:8px}.hint-body-top{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.hint-title{font-size:15px;font-weight:700;color:var(--text);flex:1;line-height:1.4}.hint-explanation{font-size:13px;line-height:1.4;color:var(--text-dim)}.hint-body-bottom{display:flex;align-items:center;gap:6px}.hint-info-icon{width:44px;height:44px;display:inline-grid;place-items:center;padding:0;border:0;background:transparent;font-size:16px;cursor:pointer;color:var(--text-dim);flex-shrink:0}.hint-tooltip{font-size:12px;font-weight:600;color:var(--text-dim)}.hint-apply{height:36px;min-height:36px;border-radius:10px;font-size:13px;font-weight:700;background:var(--accent);color:#fff;border:1px solid var(--accent);padding:0 10px;flex-shrink:0;box-shadow:0 2px 12px color-mix(in srgb,var(--accent) 30%,transparent)}.hint-apply:active:not(:disabled){opacity:.8}.hint-message-slot{flex-basis:100%;order:4;height:34px;min-height:34px;display:flex;align-items:center;justify-content:flex-end;overflow:hidden}.page-hint-message-slot{position:absolute;left:12px;right:12px;bottom:calc(var(--controls-area-height) + 4px);z-index:11;width:auto;max-width:400px;margin:0 auto;pointer-events:none}.hint-empty{font-size:12px;color:var(--text-dim);text-align:right;max-width:100%;margin:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:grid;place-items:center;background:#00000080}.theme-picker{display:grid;gap:8px;width:min(100%,260px);max-height:min(80dvh,420px);overflow-y:auto;background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:12px}.theme-opt{width:100%;min-height:44px;border-radius:4px;background:var(--bg);border:1px solid var(--border);font-size:15px;font-weight:700;text-transform:capitalize;color:var(--text)}.theme-opt:active{background:var(--surface-hover);border-color:var(--accent)}.theme-opt-active{border-color:var(--accent)!important;background:var(--accent-dim)!important}@keyframes modal-pop{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}.success-modal{display:grid;gap:8px;text-align:center;width:min(100%,280px);background:var(--surface);border:1px solid var(--accent);border-radius:8px;padding:28px 20px 20px;animation:modal-pop .3s ease-out}.success-title{font-size:24px;font-weight:800;color:var(--accent)}.success-sub{font-size:14px;color:var(--text-dim);margin-bottom:4px}.success-actions{display:grid;gap:8px}.success-btn{width:100%;min-height:48px;border-radius:4px;font-size:16px;font-weight:700;background:var(--bg);border:1px solid var(--border);color:var(--text)}.success-btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.success-btn:active{opacity:.8}.btn-spinner{display:inline-block;width:18px;height:18px;border:2.5px solid transparent;border-top-color:currentColor;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.pause-modal{display:grid;gap:12px;text-align:center;width:min(100%,280px);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:28px 20px 20px;animation:modal-pop .3s ease-out}.pause-title{font-size:22px;font-weight:800}.pause-sub{font-size:14px;color:var(--text-dim)}.pause-actions{display:grid;gap:8px;margin-top:4px}.pause-btn{width:100%;min-height:48px;border-radius:4px;font-size:16px;font-weight:700;background:var(--bg);border:1px solid var(--border);color:var(--text)}.pause-btn:active{opacity:.8}.pause-btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.settings-backdrop{display:flex;align-items:flex-end;justify-content:center}.settings-panel{width:100%;max-width:440px;background:var(--surface);border-radius:16px 16px 0 0;padding:20px 20px max(20px,env(safe-area-inset-bottom));animation:slideUp .25s ease-out}@media(min-width:1024px){.settings-panel{max-width:560px;margin:16px;border-radius:16px}}@media(min-height:900px){.settings-backdrop{align-items:center;padding:24px}.settings-panel{width:min(560px,100%);max-height:calc(100dvh - 48px);margin:0;overflow-y:auto;border:1px solid var(--border);border-radius:16px;padding:24px;animation:modal-pop .2s ease-out}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.settings-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.settings-title{font-size:18px;font-weight:700}.settings-close{width:44px;height:44px;background:none;border:none;color:var(--text);display:grid;place-items:center;border-radius:50%;cursor:pointer}.settings-close:active{background:var(--border)}.settings-row{display:flex;align-items:center;justify-content:space-between;min-height:48px;border-top:1px solid var(--border);cursor:pointer}.settings-section{display:grid;gap:10px;margin-bottom:8px}.settings-section-header{display:flex;align-items:center;justify-content:space-between;gap:8px}.settings-section-note{font-size:12px;color:var(--text-dim)}.theme-strip{display:flex;gap:8px;overflow-x:auto;padding-bottom:10px;scrollbar-width:none;-ms-overflow-style:none;scroll-snap-type:x proximity}.theme-strip::-webkit-scrollbar{display:none}.theme-chip{flex:0 0 auto;min-height:44px;padding:0 12px;border-radius:999px;background:linear-gradient(135deg,color-mix(in srgb,var(--chip-bg) 84%,var(--chip-accent-dim) 16%),var(--chip-bg));border:1px solid var(--chip-border);color:var(--chip-text);font-size:13px;font-weight:700;text-transform:capitalize;white-space:nowrap;scroll-snap-align:start;position:relative;box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--chip-accent-dim) 28%,transparent)}.theme-chip:active{background:linear-gradient(135deg,color-mix(in srgb,var(--chip-bg) 70%,var(--chip-accent) 30%),var(--chip-bg));border-color:var(--chip-accent)}.theme-chip-active{border-color:var(--chip-accent)!important;background:linear-gradient(135deg,color-mix(in srgb,var(--chip-accent-dim) 60%,var(--chip-bg) 40%),var(--chip-accent-dim))!important;color:var(--chip-accent);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--chip-accent) 42%,transparent),0 0 0 1px color-mix(in srgb,var(--chip-accent) 20%,transparent)}.theme-chip-active:after{content:"";position:absolute;bottom:-10px;left:50%;transform:translate(-50%);width:5px;height:5px;border-radius:50%;background:var(--chip-accent)}.settings-label{font-size:15px;font-weight:500;padding-right:16px}.settings-toggle{width:48px;height:28px;border-radius:12px;background:var(--border);position:relative;flex-shrink:0;transition:background .15s}.settings-toggle-on{background:var(--accent)}.settings-toggle-knob{width:24px;height:24px;border-radius:50%;background:#fff;position:absolute;top:2px;left:2px;transition:transform .15s;box-shadow:0 1px 3px #0003}.settings-toggle-on .settings-toggle-knob{transform:translate(20px)}.settings-row select{-moz-appearance:none;appearance:none;-webkit-appearance:none;min-width:100px;min-height:40px;padding:0 32px 0 12px;border-radius:10px;font-size:14px;font-weight:600;background:linear-gradient(var(--bg),var(--bg)),url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center / 14px;border:1px solid var(--border);color:var(--text);transition:border-color .12s}.settings-row select:focus{outline:none;border-color:var(--accent)}.settings-row select option{background:var(--surface);color:var(--text);font-weight:500}.settings-policy-link{display:inline-flex;align-items:center;min-height:44px;margin-top:8px;color:var(--accent);font-size:14px;font-weight:600;text-decoration:none}.settings-policy-link:active{opacity:.7}