:root{--primary-blue: #2563eb;--text-dark: #111827;--text-medium: #374151;--text-light: #6b7280;--bg-app: #f3f4f6;--bg-card: #ffffff;--border-color: #d1d5db}html,body{margin:0;padding:0;width:100%;min-height:100vh;background-color:var(--bg-app);color:var(--text-dark);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-tap-highlight-color:transparent;overflow-x:hidden}#root{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;width:100%;min-height:100vh}.container{width:100%;max-width:600px;background-color:var(--bg-card);min-height:100vh;padding:20px 20px 100px;padding-top:max(20px,env(safe-area-inset-top));box-sizing:border-box;box-shadow:0 0 20px #0000001a}.card{background:var(--bg-card);border-radius:12px;padding:16px;margin-bottom:16px;box-shadow:0 2px 5px #00000014;border:1px solid var(--border-color);color:var(--text-dark)}.input-field{width:100%;padding:12px;border:2px solid var(--border-color);background-color:var(--bg-card);color:var(--text-dark);border-radius:8px;font-size:1rem;box-sizing:border-box;margin-bottom:15px}.input-field::placeholder{color:var(--text-light)}.btn{width:100%;background-color:var(--primary-blue);color:#fff!important;padding:14px;border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer;transition:background .2s}.btn:active{transform:scale(.98)}.btn:disabled{background-color:var(--text-light);cursor:not-allowed}.form-label{display:block;margin-bottom:8px;font-size:.95rem;color:var(--text-medium);font-weight:700}.class-selector{display:flex;overflow-x:auto;gap:12px;padding:5px;scrollbar-width:none}.class-selector::-webkit-scrollbar{display:none}.class-chip{background-color:#e5e7eb;border:1px solid var(--border-color);color:var(--text-dark);padding:10px 20px;border-radius:50px;font-weight:700;font-size:1rem;white-space:nowrap;cursor:pointer}.class-chip.active{background-color:var(--primary-blue);color:#fff;border-color:var(--primary-blue);box-shadow:0 4px 6px #2563eb66}.student-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:12px;max-height:45vh;overflow-y:auto;padding:5px}.student-card{background-color:var(--bg-card);border:2px solid var(--border-color);padding:15px 10px;border-radius:12px;text-align:center;cursor:pointer}.student-card strong{display:block;font-size:1rem;color:var(--text-dark);font-weight:800}.student-card small{color:var(--text-medium);font-size:.85rem;font-weight:600}.student-card.selected{background-color:#eff6ff;border-color:var(--primary-blue);box-shadow:0 0 0 2px var(--primary-blue)}.student-card.selected strong,.student-card.selected small{color:var(--primary-blue)}.date-row,.type-selector{display:flex;gap:15px;margin-bottom:20px}.type-btn{flex:1;padding:15px;border:3px solid var(--border-color);border-radius:12px;text-align:center;font-weight:800;cursor:pointer;background:var(--bg-card);color:var(--text-medium)}.type-btn.active-red{background-color:#fef2f2;border-color:#dc2626;color:#dc2626}.type-btn.active-orange{background-color:#fff7ed;border-color:#ea580c;color:#ea580c}.upload-zone{display:block;border:3px dashed var(--border-color);border-radius:12px;padding:20px;text-align:center;color:var(--text-medium);font-weight:600;background-color:#f9fafb;margin-bottom:25px}.upload-zone.has-file{border-style:solid;border-color:#16a34a;background-color:#f0fdf4;color:#15803d}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media(max-width:380px){.student-grid{grid-template-columns:repeat(2,1fr)}.date-row{flex-direction:column;gap:10px}}.stepper-container{display:flex;align-items:center;justify-content:space-between;background-color:#f3f4f6;border-radius:12px;padding:5px;border:3px solid var(--border-color);margin-top:10px}.stepper-btn{width:60px;height:60px;display:flex;align-items:center;justify-content:center;background-color:#fff;border:2px solid var(--border-color);border-radius:10px;cursor:pointer;touch-action:manipulation;transition:all .1s}.stepper-btn svg{stroke:var(--primary-blue);transition:stroke .1s}.stepper-btn:active{background-color:var(--primary-blue);border-color:var(--primary-blue)}.stepper-btn:active svg{stroke:#fff}.stepper-value{font-size:1.5rem;font-weight:800;color:var(--text-dark);text-align:center;flex:1}:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}