:root{--bg: #f2f4fb;--surface: #ffffff;--surface-2: #f7f8fd;--border: #e6e8f2;--border-strong: #d3d7e8;--ink: #171a2e;--ink-2: #454b6b;--muted: #767d9c;--primary: #5a53f5;--primary-dark: #4740d8;--primary-soft: #eeedff;--live: #f4436c;--live-soft: #ffe9ef;--ok: #12a670;--ok-soft: #e2f6ee;--warn: #e8890c;--warn-soft: #fdf0dd;--danger: #e14343;--danger-soft: #fde9e9;--r-sm: 9px;--r: 13px;--r-lg: 18px;--r-pill: 999px;--shadow-sm: 0 1px 2px rgba(23, 26, 46, .05);--shadow: 0 2px 10px rgba(23, 26, 46, .06);--shadow-lg: 0 10px 32px rgba(23, 26, 46, .1)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe 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var(--border);position:sticky;top:0;z-index:50}.nav-logo{display:flex;align-items:center;gap:9px;font-weight:750;font-size:17px;color:var(--ink);letter-spacing:-.02em}.nav-logo:hover{text-decoration:none}.nav-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#8b7cff);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:700}.nav-links{display:flex;gap:4px;flex:1;overflow-x:auto}.nav-link{padding:7px 13px;border-radius:var(--r-pill);color:var(--ink-2);font-size:14px;font-weight:550;white-space:nowrap}.nav-link:hover{background:var(--surface-2);text-decoration:none}.nav-link.active{background:var(--primary-soft);color:var(--primary)}.nav-user{display:flex;align-items:center;gap:10px;white-space:nowrap}.avatar{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-size:13px;font-weight:650;background:var(--primary-soft);color:var(--primary);flex:none}.page{max-width:1040px;margin:0 auto;padding:28px 24px 64px}.page-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.section{margin-bottom:32px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.row{display:flex;gap:12px;align-items:center}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.col{display:flex;flex-direction:column;gap:10px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}.stack>*+*{margin-top:10px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:16px;box-shadow:var(--shadow-sm)}.card-hover{transition:box-shadow .15s,transform .15s,border-color .15s}.card-hover:hover{box-shadow:var(--shadow);border-color:var(--border-strong);transform:translateY(-1px);text-decoration:none}.hero{background:linear-gradient(135deg,#4b45e8,#7d6dff 60%,#9b7dff);color:#fff;border-radius:var(--r-lg);padding:22px 24px;box-shadow:var(--shadow-lg)}.hero h2{color:#fff}.hero .hero-label{font-size:13px;font-weight:600;opacity:.85;text-transform:uppercase;letter-spacing:.05em}.hero .hero-when{font-size:30px;font-weight:740;letter-spacing:-.03em;margin:2px 0}.hero .hero-sub{opacity:.9}button,.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;background:var(--primary);color:#fff;border:1px solid transparent;border-radius:var(--r-sm);padding:9px 15px;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:background .15s,border-color .15s;white-space:nowrap}button:hover,.btn:hover{background:var(--primary-dark);text-decoration:none}button.secondary,.btn.secondary{background:var(--surface);color:var(--ink-2);border-color:var(--border-strong)}button.secondary:hover,.btn.secondary:hover{background:var(--surface-2)}button.ghost{background:transparent;color:var(--muted);border-color:transparent;padding:6px 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var(--primary-soft)}label{font-size:13px;font-weight:550;color:var(--ink-2);display:block;margin-bottom:5px}.error{color:var(--danger);font-size:13px}.badge{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:600;padding:3px 9px;border-radius:var(--r-pill);background:var(--surface-2);color:var(--muted);white-space:nowrap}.badge.assigned,.badge.in_progress{background:var(--surface-2);color:var(--ink-2)}.badge.submitted,.badge.shaky{background:var(--warn-soft);color:var(--warn)}.badge.checked,.badge.learned{background:var(--ok-soft);color:var(--ok)}.badge.returned{background:var(--danger-soft);color:var(--danger)}.badge.live{background:var(--live-soft);color:var(--live)}.empty{text-align:center;padding:36px 20px;color:var(--muted);background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--r)}.empty-icon{display:block;margin:0 auto 8px;color:var(--muted, #6b6f86);opacity:.65}.icon{vertical-align:-3px}button>.icon+*,button>.icon{margin-right:2px}.login-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:32px;width:360px;box-shadow:var(--shadow-lg)}.hint{font-size:12px;color:var(--muted);background:var(--surface-2);padding:9px 11px;border-radius:var(--r-sm)}.board-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 16px;background:var(--surface);border-bottom:1px solid var(--border)}.board-canvas{height:calc(100vh - 109px)}@media (max-width: 720px){.nav{padding:0 14px;gap:12px}.nav-user span{display:none}.page{padding:20px 14px 48px}.hero .hero-when{font-size:24px}}.login-page{flex-direction:column;gap:4px}.login-page .brand-foot{margin:0;border-top:0}.guide-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;background:#1416288c}.guide-hole{position:fixed;border-radius:12px;pointer-events:none;box-shadow:0 0 0 9999px #1416288c;outline:2px solid 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