@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600;700&display=swap";:root{--bg: #f4f6fb;--surface: #ffffff;--surface-2: #f8fafc;--surface-3: #eef1f8;--border: #dce1eb;--border-m: #b8c4d6;--text-1: #0f172a;--text-2: #334155;--text-3: #64748b;--text-4: #94a3b8;--primary: #1e3a5f;--primary-h: #163050;--accent: #0891b2;--radius-s: 4px;--radius-m: 8px;--radius-l: 12px;--radius-xl: 16px;--shadow-s: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-m: 0 4px 12px rgba(0,0,0,.1), 0 2px 4px rgba(0,0,0,.06);--shadow-card: 0 8px 32px rgba(30,58,95,.12), 0 2px 8px rgba(0,0,0,.06);--transition: .15s ease;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--mono: "JetBrains Mono", monospace}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text-1);min-height:100vh;font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{background:var(--primary);padding:0 24px;height:56px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20;box-shadow:0 2px 8px #0000002e}.app-header__home{display:flex;align-items:center;gap:11px;background:none;border:none;cursor:pointer;padding:0}.app-header__logo{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;color:#fff;font-size:16px;font-weight:800;flex-shrink:0}.app-header__titlewrap{display:flex;flex-direction:column;align-items:flex-start;line-height:1.1}.app-header__title{font-size:.95rem;font-weight:700;color:#fff;letter-spacing:-.2px}.app-header__sub{font-size:.68rem;color:#ffffff8c;font-weight:400}.app-header__nav{display:flex;gap:6px}.btn-header-nav{padding:6px 14px;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);border-radius:var(--radius-s);color:#ffffffd9;font-size:.78rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font);white-space:nowrap}.btn-header-nav:hover{background:#fff3;color:#fff;border-color:#fff6}.app-main{flex:1;max-width:940px;width:100%;margin:0 auto;padding:40px 20px 64px}.app-main--solver{max-width:1240px}.app-main--wide{max-width:1320px}.app-main--home{max-width:1180px}.app-footer{text-align:center;padding:22px;font-size:.8rem;color:var(--text-3);border-top:1px solid var(--border)}.app-footer span{font-family:var(--mono);font-weight:600}.home{display:flex;flex-direction:column;gap:44px}.home-hero{text-align:center;padding-top:12px}.home-badge{display:inline-block;font-family:var(--mono);font-size:.72rem;font-weight:600;background:#cffafe;color:#0e7490;border:1px solid #a5f3fc;border-radius:99px;padding:3px 12px;margin-bottom:16px;letter-spacing:.02em}.home-title{font-size:clamp(1.9rem,4vw,2.6rem);font-weight:800;color:var(--primary);letter-spacing:-.6px;margin-bottom:12px}.home-sub{font-size:1rem;color:var(--text-3);max-width:540px;margin:0 auto}.home-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}@media (max-width: 1040px){.home-cards{grid-template-columns:repeat(2,1fr)}}@media (max-width: 560px){.home-cards{grid-template-columns:1fr}}.home-card{background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);padding:28px 24px;display:flex;flex-direction:column;gap:12px;text-align:left;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;position:relative;overflow:hidden;font-family:var(--font)}.home-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--accent);border-radius:var(--radius-xl) var(--radius-xl) 0 0}.home-card:hover{transform:translateY(-4px);box-shadow:0 16px 40px #1e3a5f29,0 4px 12px #00000014;border-color:var(--accent)}.home-card-icon{width:48px;height:48px;border-radius:var(--radius-l);display:grid;place-items:center;font-size:24px;color:#fff}.home-card-title{font-size:1.15rem;font-weight:700;color:var(--text-1);letter-spacing:-.2px}.home-card-desc{font-size:.88rem;color:var(--text-3);line-height:1.6;flex:1}.home-card-tags{display:flex;flex-wrap:wrap;gap:6px}.home-tag{font-size:.7rem;font-weight:600;padding:3px 9px;border-radius:99px;background:var(--surface-2);border:1px solid var(--border);color:var(--text-3)}.home-card-arrow{font-size:.85rem;font-weight:700;color:var(--accent);margin-top:4px;letter-spacing:.02em}.tutorial-screen{display:flex;justify-content:center}.tutorial-card{background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-xl);overflow:hidden;max-width:820px;width:100%;box-shadow:var(--shadow-m)}.tutorial-hero{padding:44px 52px 32px;background:var(--primary);text-align:center;position:relative;overflow:hidden}.tutorial-hero:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none}.tutorial-badge{display:inline-flex;align-items:center;gap:6px;margin-bottom:16px;padding:4px 12px;background:#ffffff1f;border:1px solid rgba(255,255,255,.2);border-radius:20px;font-size:.72rem;font-weight:600;color:#ffffffd9;letter-spacing:.04em;text-transform:uppercase;position:relative}.tutorial-logo{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;color:#fff;font-size:1.7rem;font-weight:800;margin:0 auto 18px;position:relative;box-shadow:0 4px 16px #0000004d}.tutorial-title{font-size:1.8rem;font-weight:800;color:#fff;letter-spacing:-.5px;margin-bottom:8px;position:relative}.tutorial-sub{font-size:.88rem;color:#ffffff9e;position:relative}.tut-steps-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--border)}.tut-step{display:flex;gap:14px;padding:18px 22px;border-bottom:1px solid var(--border);border-right:1px solid var(--border);transition:background var(--transition)}.tut-step:nth-child(2n){border-right:none}.tut-step:nth-last-child(-n+2){border-bottom:none}.tut-step:hover{background:var(--surface-3)}.tut-step-num{width:28px;height:28px;background:var(--primary);color:#fff;border-radius:50%;display:grid;place-items:center;font-size:.72rem;font-weight:800;font-family:var(--mono);flex-shrink:0;margin-top:1px}.tut-step-body{display:flex;flex-direction:column;gap:4px}.tut-step-title{font-size:.86rem;font-weight:700;color:var(--text-1)}.tut-step-desc{font-size:.78rem;color:var(--text-3);line-height:1.5}.tutorial-footer{padding:22px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--border);background:var(--surface-2)}.tutorial-tip{display:flex;align-items:flex-start;gap:8px;font-size:.78rem;color:var(--text-3);max-width:440px;line-height:1.55}.tutorial-tip-icon{flex-shrink:0;margin-top:1px}.btn-start-solving{height:42px;padding:0 26px;color:#fff;border:none;border-radius:var(--radius-m);font-size:.88rem;font-weight:700;cursor:pointer;transition:all var(--transition);white-space:nowrap;font-family:var(--font);box-shadow:0 2px 8px #0003}.btn-start-solving:hover{transform:translateY(-1px);box-shadow:0 4px 14px #00000040}.problem-input{display:flex;flex-direction:column;gap:20px}.pi-topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.pi-topbar-left,.pi-topbar-right{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.pi-label{font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3)}.btn-example{padding:6px 14px;background:var(--surface);border:1.5px solid var(--border-m);border-radius:var(--radius-m);font-size:.8rem;font-weight:600;color:var(--text-2);cursor:pointer;transition:all var(--transition);box-shadow:var(--shadow-s);font-family:var(--font)}.btn-example:hover{border-color:var(--accent);color:var(--accent)}.counter{display:inline-flex;align-items:center;border:1.5px solid var(--border-m);border-radius:var(--radius-m);overflow:hidden;height:34px;background:var(--surface);box-shadow:var(--shadow-s)}.counter button{width:30px;height:34px;background:none;border:none;font-size:1rem;font-weight:600;cursor:pointer;color:var(--text-2);transition:all var(--transition)}.counter button:hover:not(:disabled){background:var(--primary);color:#fff}.counter button:disabled{color:var(--border-m);cursor:not-allowed}.counter span{width:34px;text-align:center;font-weight:700;font-size:.9rem;border-left:1.5px solid var(--border-m);border-right:1.5px solid var(--border-m);height:34px;line-height:34px;background:var(--surface-2);font-family:var(--mono);color:var(--primary)}.type-toggle{display:inline-flex;border:1.5px solid var(--border-m);border-radius:var(--radius-m);overflow:hidden;height:34px;background:var(--surface);box-shadow:var(--shadow-s)}.type-toggle button{padding:0 14px;background:none;border:none;font-size:.72rem;font-weight:700;letter-spacing:.04em;cursor:pointer;color:var(--text-3);transition:all var(--transition);height:34px;font-family:var(--mono)}.type-toggle button.active{background:var(--primary);color:#fff}.type-toggle button:not(.active):hover{background:var(--surface-3);color:var(--text-1)}.pi-card{background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-l);padding:20px 22px;box-shadow:var(--shadow-s)}.pi-card-head{margin-bottom:16px}.pi-card-head h3{font-size:.95rem;font-weight:700;color:var(--text-1)}.pi-card-head p{font-size:.8rem;color:var(--text-3);margin-top:2px}.pi-balance{font-size:.82rem;font-weight:600;padding:10px 14px;border-radius:var(--radius-m);margin-top:14px}.pi-balance.ok{background:#d1fae5;color:#065f46}.pi-balance.warn{background:#fef3c7;color:#92400e}.pi-error{background:#fee2e2;color:#991b1b;padding:12px 16px;border-radius:var(--radius-m);font-size:.85rem;font-weight:600}.pi-actions{display:flex;justify-content:flex-end}.btn-solve{height:46px;padding:0 30px;color:#fff;border:none;border-radius:var(--radius-m);font-size:.92rem;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:var(--font);box-shadow:0 2px 10px #0000002e}.btn-solve:hover{transform:translateY(-1px);box-shadow:0 6px 18px #00000038}.transport-grid-scroll{overflow-x:auto}.transport-input-table{border-collapse:separate;border-spacing:0;width:100%}.transport-input-table th,.transport-input-table td{padding:0}.tit-corner{width:90px}.tit-dest{background:var(--primary);color:#fff;font-size:.8rem;font-weight:700;padding:8px 10px!important;border-radius:0;text-align:center}.tit-dest:first-of-type{border-top-left-radius:var(--radius-s)}.tit-supply-head,.tit-demand-head{background:var(--surface-3);color:var(--text-2);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:8px 10px!important;text-align:center}.tit-source{background:var(--surface-3);color:var(--text-1);font-size:.82rem;font-weight:700;padding:8px 12px!important;text-align:left;white-space:nowrap}.tit-cost,.tit-edge{width:100%;min-width:62px;height:42px;border:1px solid var(--border);text-align:center;font-family:var(--mono);font-size:.9rem;font-weight:600;color:var(--text-1);background:var(--surface);outline:none;transition:all var(--transition)}.tit-cost:focus,.tit-edge:focus{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.tit-supply{background:#ecfeff;color:#0e7490;font-weight:700}.tit-demand{background:#fef3c7;color:#92400e;font-weight:700}.tit-total{text-align:center;font-family:var(--mono);font-weight:700;font-size:.9rem;height:42px}.tit-total.ok{background:#d1fae5;color:#065f46}.tit-total.warn{background:#fee2e2;color:#991b1b}.method-choices{display:flex;flex-wrap:wrap;gap:10px}.method-chip{padding:9px 18px;background:var(--surface);border:1.5px solid var(--border-m);border-radius:99px;font-size:.84rem;font-weight:600;color:var(--text-2);cursor:pointer;transition:all var(--transition);font-family:var(--font)}.method-chip.active{color:#fff}.method-chip:not(.active):hover{border-color:var(--accent);color:var(--accent)}.pi-graph-layout{display:grid;grid-template-columns:1.9fr 1fr;gap:18px;align-items:start}.pi-card--graph{padding-bottom:12px}.pi-card--edges{display:flex;flex-direction:column;gap:12px}.edge-picker-row{display:grid;grid-template-columns:auto 1fr auto 1fr;gap:8px;align-items:center}.edge-picker-row label{font-size:.72rem;font-weight:700;text-transform:uppercase;color:var(--text-3);letter-spacing:.04em}.edge-picker-row select,.edge-row select{height:32px;border:1.5px solid var(--border-m);border-radius:var(--radius-s);background:var(--surface);font-family:var(--mono);font-size:.82rem;font-weight:600;color:var(--text-1);padding:0 6px;cursor:pointer;outline:none}.edge-picker-row select:focus,.edge-row select:focus{border-color:var(--accent)}.edge-list{display:flex;flex-direction:column;gap:6px;max-height:320px;overflow-y:auto}.edge-list-head{display:grid;grid-template-columns:1fr 18px 1fr 56px 28px;gap:6px;font-size:.66rem;font-weight:700;text-transform:uppercase;color:var(--text-4);letter-spacing:.04em;padding:0 2px}.edge-list-head span:nth-child(2){text-align:center}.edge-row{display:grid;grid-template-columns:1fr 18px 1fr 56px 28px;gap:6px;align-items:center}.edge-arrow{text-align:center;color:var(--text-3);font-weight:700}.edge-w{height:32px;border:1.5px solid var(--border-m);border-radius:var(--radius-s);text-align:center;font-family:var(--mono);font-size:.84rem;font-weight:700;color:var(--text-1);background:var(--surface-2);outline:none}.edge-w:focus{border-color:var(--accent)}.edge-del{width:28px;height:28px;border:none;background:var(--surface-3);color:var(--text-3);border-radius:var(--radius-s);font-size:1.1rem;cursor:pointer;transition:all var(--transition)}.edge-del:hover{background:#fee2e2;color:#991b1b}.btn-add-edge{align-self:flex-start;padding:7px 14px;background:var(--surface-2);border:1.5px dashed var(--border-m);border-radius:var(--radius-m);font-size:.8rem;font-weight:600;color:var(--text-2);cursor:pointer;transition:all var(--transition);font-family:var(--font)}.btn-add-edge:hover{border-color:var(--accent);color:var(--accent)}.net-graph-wrap{width:100%;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-m);overflow:hidden}.net-graph{width:100%;height:auto;display:block}.ge-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}.ge-tools{display:inline-flex;gap:4px;background:var(--surface-2);border:1px solid var(--border-m);border-radius:var(--radius-m);padding:3px}.ge-tool{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;background:none;border:1px solid transparent;border-radius:var(--radius-s);font-size:.8rem;font-weight:600;color:var(--text-2);cursor:pointer;transition:all var(--transition);font-family:var(--font)}.ge-tool:hover:not(.active){background:var(--surface-3)}.ge-tool.active{color:#fff}.ge-tool-icon{font-size:.95rem;line-height:1}.ge-hint{font-size:.76rem;color:var(--text-3);font-style:italic}.graph-editor{width:100%;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-m);overflow:hidden}.graph-editor .net-graph{touch-action:none}.ge-cursor-add .net-graph,.ge-cursor-connect .ge-node{cursor:crosshair}.ge-cursor-move .ge-node{cursor:grab}.ge-cursor-move .ge-node:active{cursor:grabbing}.ge-cursor-delete .ge-node{cursor:pointer}.ge-node{-webkit-user-select:none;user-select:none}.ge-weight-input{width:42px;height:22px;border:1.5px solid var(--accent);border-radius:4px;text-align:center;font-family:var(--mono);font-size:.78rem;font-weight:700;color:var(--text-1);outline:none;padding:0;background:#fff}.ge-caption{display:flex;flex-wrap:wrap;align-items:center;gap:14px;padding:10px 2px 2px}.ge-caption-tip{font-size:.74rem;color:var(--text-4);font-style:italic}.btn-clear{color:#b91c1c;border-color:#fca5a5}.btn-clear:hover{border-color:#dc2626;color:#dc2626;background:#fef2f2}.edge-list-title{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-3)}.edge-empty{font-size:.78rem;color:var(--text-4);font-style:italic;padding:8px 2px}.edge-row--ro{grid-template-columns:1fr 16px 1fr 56px 28px}.edge-node-tag{font-family:var(--mono);font-size:.82rem;font-weight:700;color:var(--text-1);background:var(--surface-3);border-radius:var(--radius-s);padding:5px 8px;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.edge-list--tall{max-height:260px}.node-b-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}.node-b-row{display:flex;align-items:center;gap:8px;background:var(--surface-2);border:1.5px solid var(--border);border-radius:var(--radius-m);padding:5px 8px}.node-b-row.is-supply{border-color:#6ee7b7;background:#ecfdf5}.node-b-row.is-demand{border-color:#fca5a5;background:#fef2f2}.node-b-label{font-family:var(--mono);font-size:.82rem;font-weight:700;color:var(--text-1);flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.node-b-input{width:56px;height:30px;border:1.5px solid var(--border-m);border-radius:var(--radius-s);text-align:center;font-family:var(--mono);font-size:.84rem;font-weight:700;color:var(--text-1);background:#fff;outline:none}.node-b-input:focus{border-color:var(--accent)}.viewer{display:flex;flex-direction:column;gap:18px}.viewer-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:18px;align-items:start}.viewer-graph-col{display:flex;flex-direction:column;gap:12px}.viewer-side{display:flex;flex-direction:column;gap:14px}.viewer-transport{display:flex;flex-direction:column;gap:16px}.step-explain{background:var(--surface);border:1px solid var(--border-m);border-left:4px solid var(--accent);border-radius:var(--radius-m);padding:16px 18px;box-shadow:var(--shadow-s)}.step-explain--final{border-left-color:#059669;background:#f0fdf4}.step-explain-head{font-size:.95rem;font-weight:800;letter-spacing:-.2px;margin-bottom:5px}.step-explain-desc{font-size:.86rem;color:var(--text-2);line-height:1.6}.graph-legend{display:flex;flex-wrap:wrap;gap:14px;padding:4px 2px}.graph-legend--transport{padding:4px 0}.legend-item{display:inline-flex;align-items:center;gap:6px;font-size:.76rem;color:var(--text-3);font-weight:500}.legend-dot{width:12px;height:12px;border-radius:50%}.result-banner{background:var(--surface);border:1px solid var(--border-m);border-top:3px solid var(--accent);border-radius:var(--radius-m);padding:14px 18px;text-align:center;box-shadow:var(--shadow-s)}.result-banner-label{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-3);margin-bottom:6px}.result-banner-path{font-family:var(--mono);font-size:.95rem;font-weight:700;color:var(--text-1);margin-bottom:4px}.result-banner-cost{font-size:1.3rem;font-weight:800;font-family:var(--mono)}.label-table-wrap,.flow-table-wrap{background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-m);overflow:hidden;box-shadow:var(--shadow-s)}.label-table,.flow-table{width:100%;border-collapse:collapse}.label-table th,.flow-table th{background:var(--surface-3);color:var(--text-2);font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em;padding:9px 10px;text-align:left}.label-table td,.flow-table td{padding:8px 10px;font-size:.84rem;border-top:1px solid var(--border)}.label-table .lt-node,.flow-table .ft-edge{font-family:var(--mono);font-weight:700;color:var(--text-1)}.lt-dist{font-family:var(--mono);font-weight:700;color:var(--accent)}.lt-prev{font-family:var(--mono);color:var(--text-2)}.lt-badge{font-size:.68rem;font-weight:700;padding:2px 8px;border-radius:99px}.lt-badge.perm{background:#d1fae5;color:#065f46}.lt-badge.temp{background:var(--surface-3);color:var(--text-3)}.row-active{background:#fef9ec}.row-settled{background:#f0fdfa}.graph-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.flow-badge{color:#fff;font-size:.82rem;font-weight:600;padding:7px 14px;border-radius:var(--radius-m)}.flow-badge strong{font-family:var(--mono);font-size:.95rem}.toggle-switch{display:inline-flex;border:1.5px solid var(--border-m);border-radius:var(--radius-m);overflow:hidden;background:var(--surface)}.toggle-switch button{padding:6px 12px;background:none;border:none;font-size:.74rem;font-weight:600;color:var(--text-3);cursor:pointer;transition:all var(--transition);font-family:var(--font)}.toggle-switch button.active{background:var(--primary);color:#fff}.augment-box{background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-m);padding:14px 16px;box-shadow:var(--shadow-s)}.augment-path{display:flex;flex-wrap:wrap;align-items:center;gap:4px;margin-bottom:8px}.aug-node{font-family:var(--mono);font-weight:700;font-size:.9rem;background:var(--surface-3);padding:3px 9px;border-radius:var(--radius-s);color:var(--text-1)}.aug-arrow{color:var(--text-3);margin:0 2px}.augment-bottleneck{font-size:.85rem;color:var(--text-2)}.augment-bottleneck strong{font-family:var(--mono);font-size:1rem}.ft-flow{font-family:var(--mono);font-weight:700;color:var(--text-1)}.ft-res{font-family:var(--mono);font-weight:700;color:var(--accent)}.transport-table-scroll{overflow-x:auto;background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-l);padding:14px;box-shadow:var(--shadow-s)}.transport-table{border-collapse:separate;border-spacing:0;margin:0 auto}.tt-corner{width:80px}.tt-dest{background:var(--primary);color:#fff;font-size:.8rem;font-weight:700;padding:8px 12px;text-align:center}.tt-uv-head,.tt-uv-corner{background:var(--surface-3);color:var(--text-3);font-size:.72rem;font-weight:700;padding:6px 10px;text-align:center;font-family:var(--mono)}.tt-source{background:var(--surface-3);color:var(--text-1);font-size:.82rem;font-weight:700;padding:8px 12px;text-align:left;white-space:nowrap}.tt-cell{position:relative;width:74px;height:58px;border:1px solid var(--border);text-align:center;vertical-align:middle;background:var(--surface);transition:all var(--transition)}.tt-cell--basic{background:#ecfeff}.tt-cell--empty{background:var(--surface)}.tt-cost{position:absolute;top:3px;left:5px;font-size:.62rem;font-weight:600;color:var(--text-4);font-family:var(--mono)}.tt-alloc{font-family:var(--mono);font-size:1.05rem;font-weight:800;color:#0e7490}.tt-reduced{font-family:var(--mono);font-size:.82rem;font-weight:600;color:var(--text-3)}.tt-reduced.neg{color:#dc2626;font-weight:800}.tt-empty-dot{color:var(--border-m);font-size:1rem}.tt-loop-sign{position:absolute;top:2px;right:4px;font-size:.95rem;font-weight:800;font-family:var(--mono)}.tt-cell--plus{box-shadow:inset 0 0 0 2px #0891b2}.tt-cell--plus .tt-loop-sign{color:#0891b2}.tt-cell--minus{box-shadow:inset 0 0 0 2px #d97706}.tt-cell--minus .tt-loop-sign{color:#d97706}.tt-cell--entering{box-shadow:inset 0 0 0 3px #dc2626;background:#fef2f2}.tt-cell--leave{outline:2px dashed #d97706;outline-offset:-3px}.tt-uv{background:var(--surface-2);font-family:var(--mono);font-size:.78rem;font-weight:700;color:var(--primary);padding:6px 10px;text-align:center;white-space:nowrap}.tt-v-row td{border-top:2px solid var(--border-m)}.tt-swatch{display:inline-grid;place-items:center;width:16px;height:16px;border-radius:3px;font-size:.7rem;font-weight:800;font-family:var(--mono)}.tt-swatch.basic{background:#ecfeff;border:1px solid #a5f3fc}.tt-swatch.reduced{background:var(--surface);border:1px solid var(--border-m);color:var(--text-3)}.tt-swatch.plus{box-shadow:inset 0 0 0 2px #0891b2;color:#0891b2}.tt-swatch.minus{box-shadow:inset 0 0 0 2px #d97706;color:#d97706}.step-controls{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surface);border:1px solid var(--border-m);border-radius:var(--radius-l);padding:12px 18px;box-shadow:var(--shadow-s);position:sticky;bottom:12px}.step-btn{padding:9px 18px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-m);font-size:.84rem;font-weight:700;cursor:pointer;transition:all var(--transition);font-family:var(--font);white-space:nowrap}.step-btn:hover:not(:disabled){background:var(--primary-h)}.step-btn:disabled{background:var(--surface-3);color:var(--text-4);cursor:not-allowed}.step-progress{display:flex;flex-direction:column;align-items:center;gap:6px;flex:1}.step-dots{display:flex;gap:5px;flex-wrap:wrap;justify-content:center;max-width:100%}.step-dot{width:9px;height:9px;border-radius:50%;background:var(--border-m);transition:all var(--transition)}.step-dot.done{background:var(--text-4)}.step-dot.active{transform:scale(1.35)}.step-count{font-size:.74rem;font-weight:700;color:var(--text-3);font-family:var(--mono)}@media (max-width: 900px){.viewer-grid,.pi-graph-layout,.tut-steps-grid{grid-template-columns:1fr}.tut-step:nth-child(2n){border-right:1px solid var(--border)}.tut-step{border-right:none!important}}@media (max-width: 560px){.app-header{padding:0 14px}.app-header__sub{display:none}.app-main{padding:28px 14px 56px}.tutorial-hero,.tutorial-footer{padding-left:24px;padding-right:24px}.step-controls{flex-wrap:wrap}}
