@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--primary:#171717;--primary-hover:#262626;--bg-color:#fafafa;--sidebar-bg:#fff;--text-main:#171717;--text-muted:#525252;--border-color:#e5e5e5;--success:#16a34a;--error:#dc2626}body{background-color:var(--bg-color);color:var(--text-main);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}.btn{cursor:pointer;border:none;border-radius:4px;align-items:center;gap:8px;padding:8px 16px;font-size:14px;font-weight:500;transition:background-color .2s,color .2s;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-outline{border:1px solid var(--border-color);background:#fff}.btn-outline:hover{background:#f1f5f9}.btn-danger{background:var(--error);color:#fff}.app-layout{min-width:0;height:100dvh;display:flex;position:relative;overflow:hidden}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border-color);flex-direction:column;width:280px;display:flex}.profile-section{border-bottom:1px solid var(--border-color);align-items:center;gap:12px;padding:24px;display:flex}.profile-avatar{width:48px;height:48px;color:var(--text-muted);background:#e2e8f0;border-radius:50%;justify-content:center;align-items:center;font-size:18px;font-weight:700;display:flex}.profile-info h3{margin:0;font-size:16px;font-weight:600}.profile-info p{color:var(--text-muted);margin:4px 0 0;font-size:13px}.nav-section{border-bottom:1px solid var(--border-color);padding:16px 0}.nav-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;padding:0 24px;font-size:12px;font-weight:600}.nav-item{cursor:pointer;color:var(--text-main);border:1px solid var(--border-color);background:#fff;border-radius:4px;align-items:center;gap:10px;margin:8px 16px;padding:12px 16px;font-size:14px;transition:border-color .2s,background .2s,color .2s;display:flex}.nav-item:hover{border-color:var(--text-muted)}.nav-item.active{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:500}.module-list{margin-top:8px;padding-left:24px}.module-item{color:var(--text-muted);cursor:pointer;border-left:2px solid var(--border-color);align-items:center;gap:8px;padding:8px 24px 8px 16px;font-size:13px;display:flex}.module-item:hover{color:var(--text-main)}.module-item.active{color:var(--primary);border-left-color:var(--primary);font-weight:500}.module-item.completed{color:var(--success)}.main-area{flex-direction:column;flex:1;min-width:0;min-height:0;padding:48px;display:flex;position:relative;overflow-y:auto}.content-header{justify-content:space-between;align-items:flex-end;margin-bottom:32px;display:flex}.content-header h1{margin:0 0 8px;font-size:28px}.content-header p{color:var(--text-muted);margin:0;font-size:15px}.login-container{background-color:#f1f5f9;justify-content:center;align-items:center;height:100vh;display:flex}.login-card{border:1px solid var(--border-color);text-align:center;background:#fff;border-radius:4px;width:100%;max-width:440px;padding:48px}.login-card h1{margin:0 0 8px;font-size:24px}.login-card p{color:var(--text-muted);margin-bottom:32px}.input-group{text-align:left;margin-bottom:24px}.input-group 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var(--border-color);justify-content:flex-end;gap:12px;margin-top:32px;padding-top:24px;display:flex}.quiz-question{margin-bottom:32px}.quiz-question h4{margin:0 0 16px;font-size:16px;font-weight:600;line-height:1.4}.quiz-option{border:1px solid var(--border-color);cursor:pointer;border-radius:4px;align-items:center;margin-bottom:12px;padding:14px 16px;transition:border-color .2s;display:flex}.quiz-option:hover{background:#f8fafc;border-color:#cbd5e1}.quiz-option.selected{border-color:var(--primary);background:#f4f4f5}.quiz-option 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