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var(--border);background:var(--code-bg);border-radius:8px;width:100%;height:400px}.loading{text-align:center;color:var(--text);padding:48px}.error{text-align:center;color:#dc2626;padding:48px}.header-nav{align-items:center;gap:12px;display:flex}.header-nav-link{color:var(--accent);white-space:nowrap;font-size:14px;font-weight:600;text-decoration:none}.header-nav-link:hover{text-decoration:underline}.concept-actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.btn{border:1px solid var(--border);cursor:pointer;background:var(--code-bg);color:var(--text-h);border-radius:6px;padding:6px 14px;font-size:14px;font-weight:600}.btn:hover{border-color:var(--accent);color:var(--accent)}.btn-active{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-active:hover{background:var(--accent);opacity:.9}.learning-path-page{max-width:700px}.learning-path-page h1{margin:0 0 16px;font-size:28px}.guest-banner{color:#854d0e;background:#fef9c3;border:1px solid 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var(--border);border-radius:6px;margin-bottom:16px;display:flex;overflow:hidden}.modal-tab{cursor:pointer;color:var(--text);background:0 0;border:none;flex:1;padding:7px;font-size:14px;font-weight:600}.modal-tab.active{background:var(--accent);color:#fff}.modal-form{flex-direction:column;gap:12px;display:flex}.form-field{flex-direction:column;gap:4px;display:flex}.form-field label{color:var(--text);font-size:13px;font-weight:600}.form-field input{border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);border-radius:6px;outline:none;padding:8px 12px;font-size:14px}.form-field input:focus{border-color:var(--accent)}.error-msg{color:#dc2626;margin:0;font-size:13px}.success-msg{color:#16a34a;font-size:14px}.modal-notice{color:var(--text);font-size:14px}.hero{margin-bottom:12px;padding:64px 0 48px}.hero-headline{letter-spacing:-.5px;margin:0 0 20px;font-size:40px;font-weight:800;line-height:1.15}.hero-subtext{color:var(--text);max-width:560px;margin:0 0 10px;font-size:18px;line-height:1.6}.hero-actions{flex-wrap:wrap;align-items:center;gap:20px;margin-top:32px;display:flex}.btn-lg{padding:12px 28px;font-size:16px}.hero-or{color:var(--text);opacity:.7;font-size:14px}.dashboard-page{max-width:700px}.dashboard-page h1{margin:0 0 24px;font-size:28px}.dashboard-section{margin-bottom:36px}.dashboard-section h2{border-bottom:1px solid var(--border);margin:0 0 12px;padding-bottom:4px;font-size:18px}.dashboard-goal-title{margin:0 0 12px;font-size:20px;font-weight:700}.dashboard-estimate{color:var(--text);margin:8px 0 0;font-size:14px}.dashboard-card-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px;display:grid}.dashboard-card{border:1px solid var(--border);background:var(--code-bg);color:inherit;border-radius:8px;flex-direction:column;gap:4px;padding:12px 14px;text-decoration:none;transition:border-color 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