:root{--bg: #eef5f3;--panel: #ffffff;--ink: #173036;--muted: #5f7076;--line: #d7e2e5;--primary: #05515f;--primary-dark: #033f49;--primary-soft: #e6f0f2;--accent: #c18a2d;--danger: #b42318;--warning: #92400e;--left-seat: #eaf4f6;--right-seat: #ecfdf5;--teacher: #f8fafc;--shadow: 0 18px 48px rgba(5, 81, 95, .1)}*{box-sizing:border-box}body{min-height:100vh;margin:0;color:var(--ink);background:var(--bg);font-family:Segoe UI,Arial,sans-serif}button,input,select{font:inherit}.center-screen{display:grid;min-height:100vh;place-items:center;padding:24px}.auth-card,.panel,.plan-surface{border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:var(--shadow)}.auth-card{width:min(440px,100%);padding:28px}.auth-logo{display:block;width:136px;height:auto;margin:0 0 18px}.app-shell{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:100vh}.sidebar{display:flex;flex-direction:column;gap:24px;padding:22px;border-right:1px solid var(--line);background:var(--primary-dark);color:#fff}.brand,.nav-link,.sidebar-action,.button{display:inline-flex;align-items:center;gap:10px}.brand-logo,.brand svg,.nav-link svg,.button svg{width:18px;height:18px}.brand-logo{width:36px;height:36px;border-radius:8px;background:#fff;object-fit:cover}.brand strong{display:block}.brand span,.user-email,.eyebrow{color:var(--muted)}.sidebar .brand span{color:#cbd5e1}.sidebar-nav{display:grid;gap:8px}.nav-link{min-height:42px;padding:0 12px;border:0;border-radius:6px;background:transparent;color:#cbd5e1;font:inherit;font-weight:750;cursor:pointer;text-align:left}.nav-link.active{background:#ffffff1f;color:#fff}.sidebar-action{margin-top:auto}.main-area{min-width:0;padding:24px}.topbar,.section-header,.action-row,.pair-form{display:flex;align-items:center;justify-content:space-between;gap:14px}.topbar{margin-bottom:18px}.topbar h1,.section-header h2,.print-heading 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var(--primary-soft);border-radius:8px;background:#f8fbfa}.form-grid>label:nth-child(n+5){grid-template-columns:minmax(0,1fr) minmax(88px,140px);align-items:center;gap:8px 10px}.form-grid>label:nth-child(n+5) input,.form-grid>label:nth-child(n+5) select{min-height:36px}.form-grid>label:nth-child(n+6):nth-child(-n+10) input{text-align:center}label{display:grid;gap:6px;color:#344054;font-size:.92rem;font-weight:800}input,select{width:100%;min-height:40px;padding:0 10px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;color:var(--ink)}.button{min-height:40px;padding:0 14px;border:1px solid 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2cm);grid-template-rows:auto 1fr;gap:0}.print-heading{padding-bottom:7mm}.print-heading h2{font-size:18pt}.plan-surface{display:grid;min-height:0;align-items:center;justify-items:center;overflow:visible;padding:0;border:0;box-shadow:none}.classroom-plan{gap:4mm;width:min(100%,260mm)}.seat,.teacher-desk{min-height:18mm;font-size:10pt}}