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4px 16px rgba(74, 55, 40, .12);--shadow-lg: 0 8px 32px rgba(74, 55, 40, .16);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;background-color:var(--color-background);color:var(--color-text);line-height:1.6;min-height:100vh;overflow-x:hidden}a{color:var(--color-primary);text-decoration:none;transition:color .2s}a:hover{color:var(--color-primary-dark)}button{cursor:pointer;font-family:inherit;border:none;outline:none;transition:all .2s ease}input,select,textarea{font-family:inherit;outline:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border-radius:24px;font-size:.9rem;font-weight:600;transition:all .2s}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;box-shadow:0 4px 12px #ff7b5e4d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #ff7b5e66}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:linear-gradient(135deg,var(--color-secondary),var(--color-secondary-dark));color:var(--color-text);box-shadow:0 4px 12px #ffd1664d}.btn-secondary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #ffd16666}.btn-outline{background:transparent;border:2px solid var(--color-primary);color:var(--color-primary)}.btn-outline:hover{background:var(--color-primary);color:#fff}.btn-danger{background:var(--color-danger);color:#fff}.btn-ghost{background:transparent;color:var(--color-text-light);padding:8px 12px}.btn-ghost:hover{background:var(--color-background);color:var(--color-text)}.btn-sm{padding:6px 12px;font-size:.8rem}.btn-lg{padding:14px 28px;font-size:1rem}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.form-group{margin-bottom:16px}.form-label{display:block;font-size:.85rem;font-weight:600;color:var(--color-text);margin-bottom:6px}.form-input{width:100%;padding:12px 16px;border:2px solid var(--color-border);border-radius:var(--radius-sm);font-size:.95rem;color:var(--color-text);background:var(--color-card);transition:border-color .2s}.form-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #ff7b5e26}.form-input::placeholder{color:#bbb}.loading-spinner{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--color-text-light)}.loading-spinner:after{content:"";width:32px;height:32px;border:3px solid var(--color-border);border-top:3px solid var(--color-primary);border-radius:50%;animation:spin .8s linear infinite;margin-left:12px}@keyframes spin{to{transform:rotate(360deg)}}.toast{position:fixed;top:20px;right:20px;padding:12px 20px;border-radius:var(--radius-sm);color:#fff;font-weight:500;z-index:1000;animation:slideInRight .3s ease;box-shadow:var(--shadow-lg)}.toast-success{background:var(--color-success)}.toast-error{background:var(--color-danger)}.toast-info{background:var(--color-primary)}@keyframes slideInRight{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.file-input-hidden{display:none}.card{background:var(--color-card);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:20px;transition:box-shadow .2s}.card:hover{box-shadow:var(--shadow-md)}.page-header{margin-bottom:24px}.page-header h2{font-size:1.5rem;font-weight:700;color:var(--color-text)}.page-header p{color:var(--color-text-light);font-size:.9rem;margin-top:4px}@media (max-width: 768px),(orientation: portrait){.student-grid,.snack-grid{grid-template-columns:repeat(2,1fr)!important}.modal-overlay{z-index:400!important}.modal-card{max-width:95vw!important;padding:16px;border-radius:12px 12px 0 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