* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, sans-serif; max-width: 900px; margin: 0 auto; padding: 1rem; line-height: 1.5; color: #1f2937; background: #f9fafb; }
nav { display: flex; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid #e5e7eb; margin-bottom: 2rem; }
nav a { color: #2563eb; text-decoration: none; }
nav a:last-child { margin-left: auto; }
h1 { font-weight: 500; margin-top: 0; }
h2 { font-weight: 500; margin-top: 2rem; }
.login-card { max-width: 400px; margin: 4rem auto; padding: 2rem; background: #fff; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.login-card label { display: block; margin: 1rem 0; }
.login-card input { width: 100%; padding: .5rem; border: 1px solid #d1d5db; border-radius: 4px; font-size: 1rem; margin-top: .25rem; }
button { background: #2563eb; color: #fff; border: none; padding: .6rem 1.2rem; border-radius: 4px; cursor: pointer; font-size: 1rem; }
button:hover { background: #1d4ed8; }
.flash { padding: .75rem 1rem; border-radius: 4px; margin-bottom: 1rem; }
.flash-error { background: #fee2e2; color: #991b1b; }
.flash-success { background: #dcfce7; color: #166534; }
.muted { color: #6b7280; font-size: .9rem; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.stat { background: #fff; padding: 1rem; border-radius: 8px; text-align: center; box-shadow: 0 1px 2px rgba(0,0,0,.05); }
.stat .num { display: block; font-size: 1.75rem; font-weight: 600; }
.stat .label { display: block; color: #6b7280; font-size: .85rem; }
.roadmap { padding-left: 1.5rem; }
.roadmap li { margin-bottom: 1rem; padding: 1rem; background: #fff; border-radius: 8px; border-left: 3px solid #e5e7eb; }
.roadmap li.status-in_progress { border-left-color: #f59e0b; }
.roadmap li.status-completed { border-left-color: #10b981; }
.topic-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.score { color: #6b7280; font-size: .9rem; }
.actions { display: flex; gap: 1rem; align-items: center; margin-top: .5rem; flex-wrap: wrap; }
.actions a { color: #2563eb; text-decoration: none; }
.badge { color: #6b7280; font-size: .9rem; }
.badge.done { color: #10b981; font-weight: 500; }
details { margin-top: .5rem; }
summary { cursor: pointer; color: #6b7280; font-size: .9rem; }
section { background: #fff; padding: 1.5rem; border-radius: 8px; margin-bottom: 1.5rem; box-shadow: 0 1px 2px rgba(0,0,0,.05); }
section form { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem; }
section form input, section form select, section form textarea { padding: .5rem; border: 1px solid #d1d5db; border-radius: 4px; }
section form textarea { flex: 1 1 100%; min-height: 3rem; }
section ul, section ol { padding-left: 1.5rem; }