:root{font-family:Tahoma,"Segoe UI",Arial,sans-serif;color:#1c2e2b;background:#f5f8f6;font-size:16px;--blue:#2563eb;--muted:#62716e;--burgundy:#800020;--line:#ccd6df;--pale:#dbeafe}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button{cursor:pointer;border:0}button:disabled{opacity:.5;cursor:wait}a{color:var(--blue)}:focus-visible{outline:3px solid #f59e0b;outline-offset:4px}button,input{touch-action:manipulation}h1,h2,h3,p{margin:0}h1{font-size:2.25rem;line-height:1.4;overflow-wrap:anywhere}h2{font-size:1.35rem;font-weight:500;line-height:1.7}.shell{max-width:920px;min-height:100dvh;margin:auto;padding:0 24px;display:flex;flex-direction:column}main{flex:1;padding:44px 0 28px;min-width:0}footer{border-top:1px solid var(--line);font-size:.75rem;color:var(--muted);text-align:center;padding:14px 0 18px;line-height:1.8}header{margin-bottom:24px}.greeting{font-size:1.2rem;margin-top:12px;line-height:1.8}.greeting bdi{color:var(--blue);font-weight:500}.muted,.subtitle{color:var(--muted)}.subtitle{margin-top:10px;font-size:.95rem;line-height:1.8}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 22px;border-radius:16px;background:white;color:var(--blue);font-weight:500;line-height:1.5}.primary{color:white;background:var(--blue)}.danger{color:white;background:#dc2626}.icon{width:56px;height:56px;padding:14px;flex-shrink:0}.icon svg,button svg{width:24px;height:24px;flex-shrink:0}.full{width:100%}.welcome{min-height:68dvh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;max-width:440px;margin:auto}.welcome p{font-size:1.5rem}.welcome h1{font-size:3.5rem;color:var(--blue);margin:10px 0 28px}.welcome hr{width:100%;margin:0 0 28px}.welcome .google{margin-top:18px}.welcome .subtitle{font-size:.9rem}hr{border:0;border-top:1px solid var(--line);margin:24px 0 18px}.course-list{display:grid;gap:24px;margin:16px 0 28px}.course-card{min-width:0}.course-open{text-align:start;background:white;padding:22px;border-radius:22px;width:100%;color:inherit;transition:box-shadow .15s,transform .15s}.course-open:hover{box-shadow:0 6px 24px #1725540c;transform:translateY(-1px)}.course-title{font-size:1.25rem;color:var(--burgundy);font-weight:700;display:block;overflow-wrap:anywhere;line-height:1.6}.course-meta{display:block;color:var(--muted);font-size:.875rem;margin:8px 0 12px;line-height:1.8}.progress-label{font-size:.875rem;color:var(--blue);display:block;text-align:end;margin-bottom:5px}.completed .progress-label{color:#15803d}progress{display:block;width:100%;height:7px;appearance:none;border:0;border-radius:6px;overflow:hidden;background:var(--pale)}progress::-webkit-progress-bar{background:var(--pale)}progress::-webkit-progress-value{background:var(--blue);border-radius:6px}progress::-moz-progress-bar{background:var(--blue);border-radius:6px}.completed progress::-webkit-progress-value{background:#16a34a}.completed progress::-moz-progress-bar{background:#16a34a}.course-actions{display:flex;gap:8px;padding-top:4px}.course-actions button{flex:1;height:44px;background:transparent;padding:6px 0}.course-actions span{display:flex;align-items:center;justify-content:center;height:32px;border-radius:10px;color:white;background:var(--blue)}.course-actions .delete span{background:#dc2626}.course-actions svg{width:20px;height:20px}#actions{position:sticky;bottom:0;background:#f5f8f6f5;display:flex;gap:12px;padding:12px 0;align-items:center;z-index:2}#actions:empty{display:none}#actions .logout{flex:1}.empty{padding:40px 0;text-align:center}.empty h2{color:var(--blue);font-size:1.5rem}.empty p{margin-top:16px;color:var(--muted);line-height:1.8}.status{color:var(--muted);font-size:.8rem;line-height:1.8;margin:16px 0 4px;overflow-wrap:anywhere}.stats-stack{display:grid;gap:10px}.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));background:white;border-radius:18px;padding:10px 4px;gap:4px}.stats.three{grid-template-columns:repeat(3,minmax(0,1fr))}.stat{text-align:center;padding:2px}.stat strong{display:block;color:var(--blue);font-size:1.4rem;line-height:1.5;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.stat span{display:block;color:var(--muted);font-size:.875rem;line-height:1.6}.check-section{margin:24px 0}.check-section .subtitle{font-size:.875rem;margin:6px 0 18px}.checks{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.check{display:flex;align-items:center;justify-content:center;gap:9px;background:white;min-height:58px;border-radius:12px;padding:10px 6px;cursor:pointer;font-variant-numeric:tabular-nums}.check:has(input:checked){background:var(--pale)}.check input{width:20px;height:20px;accent-color:var(--blue);margin:0;cursor:pointer}.pagination{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:14px}.pagination span{font-size:.875rem;color:var(--muted)}.pagination button{padding:8px 14px;min-height:44px}.back{margin-top:24px}.form{max-width:560px;margin:auto}.field{display:block;margin:20px 0}.field span{display:block;font-size:.95rem;margin-bottom:9px}.field input{width:100%;border:1px solid transparent;background:white;border-radius:12px;min-height:52px;padding:12px 14px;color:inherit}.field input:focus{border-color:var(--blue)}.field input[readonly]{background:#edf1ef;color:var(--muted)}.form-note{color:var(--muted);font-size:.875rem;line-height:1.8;margin:15px 0}.form-actions{display:flex;gap:10px;margin-top:24px}.form-actions button{flex:1}.error{color:#b91c1c;line-height:1.8;margin:12px 0}.error:empty{display:none}dialog{border:0;border-radius:22px;max-width:480px;width:calc(100% - 32px);background:#f5f8f6;color:inherit;padding:26px;max-height:90dvh;overflow:auto}dialog::backdrop{background:#15233380;backdrop-filter:blur(3px)}dialog h2{font-weight:700}dialog p{line-height:1.9;margin:14px 0}#toast{position:fixed;bottom:100px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);width:max-content;background:#1c2e2b;color:white;border-radius:14px;padding:13px 20px;z-index:10;font-size:.9rem;line-height:1.7}.loading{padding:30px;text-align:center;color:var(--muted)}.inline-error{background:#fff1f2;color:#9f1239;border-radius:14px;padding:14px;margin:16px 0;line-height:1.8}.small-action{margin-top:8px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-width:760px){.course-list{grid-template-columns:repeat(2,minmax(0,1fr))}.detail{max-width:660px;margin:auto}#actions{max-width:660px;width:100%;align-self:center}.checks{grid-template-columns:repeat(6,minmax(0,1fr))}.welcome{min-height:76dvh}}
@media(max-width:400px){.shell{padding:0 16px}main{padding-top:28px}h1{font-size:1.9rem}.stat strong{font-size:1.2rem}.stat span{font-size:.8rem}.checks{gap:6px}.check{gap:5px}#actions{gap:8px}.button{padding:12px 14px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}