*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#fafafa;--text:#1a1a2e;--accent:#6c63ff;--accent-hover:#5a52d5;--card-bg:#fff;--border:#e0e0e0;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--bg:#0f0f23;--text:#e0e0e0;--card-bg:#1a1a2e;--border:#2a2a3e}}body{background:var(--bg);color:var(--text);min-height:100vh}.landing{flex-direction:column;justify-content:center;align-items:center;gap:1rem;min-height:100vh;display:flex}.landing h1{color:var(--accent);font-size:4rem;font-weight:800}.sign-in-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:.75rem 2rem;font-size:1.1rem;transition:background .2s}.sign-in-btn:hover{background:var(--accent-hover)}.dashboard header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:1rem 2rem;display:flex}.dashboard main{max-width:800px;margin:0 auto;padding:2rem}.student-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;margin-top:1rem;padding:1.5rem}.student-card h3{margin-bottom:.25rem}.student-card button{border:1px solid var(--border);background:var(--card-bg);cursor:pointer;border-radius:6px;margin-top:1rem;padding:.5rem 1rem}.student-card button:disabled{opacity:.5;cursor:not-allowed}