:root{--color-red:#100ecd;--color-red-dark:#09086b;--color-yellow:#f9d233;--color-bg:#f4f4f4;--color-white:#ffffff;--color-text:#333333;--color-success:#00b894;--color-danger:#d63031;--font-main:'Segoe UI',Roboto,Helvetica,Arial,sans-serif}*{margin:0;padding:0;box-sizing:border-box;font-family:var(--font-main)}body{background-color:var(--color-bg);color:var(--color-text);-webkit-tap-highlight-color:transparent;font-size:16px}.admin-header{background:var(--color-white);padding:20px 16px;box-shadow:0 2px 12px rgba(0,0,0,0.08);display:flex;justify-content:space-between;align-items:center;border-bottom:4px solid var(--color-red);position:sticky;top:0;z-index:10;backdrop-filter:blur(10px);background:rgba(255,255,255,0.95)}.container{max-width:1000px;margin:20px auto 40px;padding:0 16px}.card{background:var(--color-white);border-radius:20px;padding:20px 16px;margin-bottom:20px;box-shadow:0 8px 24px rgba(0,0,0,0.05);border-top:4px solid var(--color-yellow);transition:transform .2s,box-shadow .2s}.card h3{color:var(--color-red);margin-bottom:18px;display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.25rem;letter-spacing:-0.3px}.input-group{margin-bottom:14px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}input,textarea{width:100%;padding:14px 16px;border:1.5px solid #e0e0e0;border-radius:14px;font-size:1rem;outline:none;background:#fafafa;transition:border .2s,box-shadow .2s}input:focus,textarea:focus{border-color:var(--color-red);box-shadow:0 0 0 3px rgba(16,14,205,0.15);background:#fff}.btn{padding:14px 20px;border:none;border-radius:14px;font-weight:700;cursor:pointer;transition:.25s;color:var(--color-white);display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:.95rem;letter-spacing:.3px;box-shadow:0 4px 10px rgba(0,0,0,0.08);min-height:48px;white-space:nowrap}.btn:active{transform:translateY(1px)}.btn-red{background:var(--color-red)}.btn-red:hover{background:var(--color-red-dark)}.btn-yellow{background:var(--color-yellow);color:var(--color-text)}.btn-yellow:hover{background:#e0a800}.btn-green{background:var(--color-success)}.btn-green:hover{background:#00a57d}.btn-danger{background:var(--color-danger)}.btn-danger:hover{background:#b71c1c}.assignment-item{background:#fdfdfd;border:1px solid #eee;padding:14px 12px;border-radius:18px;margin-bottom:10px;display:grid;grid-template-columns:auto 1fr auto auto;gap:12px;align-items:center;border-left:5px solid var(--color-red);transition:.2s}.assignment-item.paid{border-left-color:var(--color-success);background:#f0fff4}@media (max-width:600px){.assignment-item{grid-template-columns:auto 1fr auto;gap:8px}.assignment-item .delete-btn{grid-column:span 3;justify-self:stretch}}.status-toggle{cursor:pointer;transform:scale(1.6);accent-color:var(--color-success)}#toast-container{position:fixed;bottom:24px;right:16px;z-index:9999;display:flex;flex-direction:column;gap:12px;pointer-events:none;max-width:90vw}.toast{background:#ffffff;color:#1f1f1f;padding:16px 20px;border-radius:20px;border-bottom-right-radius:6px;box-shadow:0 12px 28px rgba(0,0,0,0.18);transform:translateX(120%);transition:transform .35s cubic-bezier(.25,.8,.25,1.2);display:flex;align-items:center;gap:12px;font-weight:500;border-left:5px solid var(--color-yellow);backdrop-filter:blur(8px);background:rgba(255,255,255,0.92);pointer-events:auto;max-width:300px;word-break:break-word;font-size:.95rem}.toast.show{transform:translateX(0)}.toast.success{border-left-color:var(--color-success);background:rgba(240,255,245,0.95)}.toast.error{border-left-color:var(--color-danger);background:rgba(255,240,240,0.95)}.toast i{font-size:1.4rem;color:var(--color-red)}.toast.success i{color:var(--color-success)}.toast.error i{color:var(--color-danger)}.emoji-preview{font-size:1.4rem;margin-left:8px;background:#f0f0f0;border-radius:10px;padding:6px 12px}