*{margin:0;padding:0;box-sizing:border-box}:root{--primary:#2896cd;--primary-dark:#1e7ab3;--primary-light:#e8f4fb;--success:#10b981;--error:#ef4444;--bg:#f5f7fa;--card-bg:#ffffff;--card-border:rgba(0, 0, 0, 0.08);--card-shadow:0 4px 16px rgba(0, 0, 0, 0.06);--text:#1a1a2e;--text-muted:#64748b;--text-hint:#94a3b8;--radius:16px;--radius-sm:8px}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;-webkit-user-drag:none}.pay-container{max-width:480px;margin:0 auto;padding:24px 16px;min-height:100vh;display:flex;flex-direction:column}.pay-header{text-align:center;margin-bottom:32px}.pay-header .logo{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:24px}.pay-header .logo i{font-size:28px;color:var(--primary)}.pay-header .logo span{font-family:Outfit,sans-serif;font-size:24px;font-weight:600}.pay-header h1{font-family:Outfit,sans-serif;font-size:28px;font-weight:700;margin-bottom:8px}.pay-header p{color:var(--text-muted);font-size:14px}.pay-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--card-shadow)}.card-header{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--card-border)}.card-header i{font-size:24px;color:var(--primary)}.card-header h2{font-family:Outfit,sans-serif;font-size:18px;font-weight:600}.student-info{display:flex;flex-direction:column;gap:4px}.student-id-badge{display:inline-block;background:var(--primary);color:#fff;font-size:11px;font-weight:600;padding:2px 8px;border-radius:4px;width:fit-content}.card-body{padding:20px}.card-footer{padding:16px 20px;border-top:1px solid var(--card-border)}.form-group{margin-bottom:20px}.form-label{display:block;font-size:13px;font-weight:500;color:var(--text-muted);margin-bottom:8px}.form-input{width:100%;padding:14px 16px;background:#fff;border:1px solid var(--card-border);border-radius:var(--radius-sm);color:var(--text);font-size:16px;font-family:inherit;transition:all .2s;-webkit-user-select:text;user-select:text}.form-input:focus{outline:0;border-color:var(--primary);background:var(--primary-light)}.form-input::placeholder{color:var(--text-hint)}.form-hint{display:block;font-size:12px;color:var(--text-hint);margin-top:6px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;font-size:15px;font-weight:600;font-family:inherit;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:0 0;color:var(--text-muted);border:1px solid var(--card-border)}.btn-ghost:hover{background:rgba(255,255,255,.05);color:var(--text)}.btn-block{width:100%}.btn-success{background:var(--success);color:#fff}.section-label{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:16px}.courses-list{display:flex;flex-direction:column;gap:12px}.course-card{background:var(--primary-light);border:1px solid var(--card-border);border-radius:var(--radius-sm);padding:16px}.course-card.paid{opacity:.6}.course-name{font-family:Outfit,sans-serif;font-size:16px;font-weight:600;margin-bottom:12px}.course-fees{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}.fee-item{text-align:center}.fee-item .label{display:block;font-size:11px;color:var(--text-hint);margin-bottom:4px}.fee-item .value{font-size:14px;font-weight:600}.fee-item .value.due{color:var(--primary)}.fee-item .value.paid-full{color:var(--success)}.course-actions{display:flex;gap:8px}.amount-input-wrapper{flex:1;position:relative}.amount-input-wrapper .currency{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-weight:500}.amount-input{width:100%;padding:10px 12px 10px 28px;background:#fff;border:1px solid var(--card-border);border-radius:var(--radius-sm);color:var(--text);font-size:14px;font-family:inherit}.amount-input:focus{outline:0;border-color:var(--primary)}.btn-pay{padding:10px 16px;font-size:13px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);font-weight:600;cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .2s}.btn-pay:hover{background:var(--primary-dark)}.btn-pay:disabled{opacity:.5;cursor:not-allowed}.paid-badge{display:flex;align-items:center;justify-content:center;gap:6px;color:var(--success);font-size:13px;font-weight:600}.success-card{text-align:center;padding:40px 24px}.success-icon{width:80px;height:80px;background:rgba(16,185,129,.15);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 24px}.success-icon i{font-size:40px;color:var(--success)}.success-card h2{font-family:Outfit,sans-serif;font-size:24px;margin-bottom:8px}.success-card p{color:var(--text-muted);margin-bottom:24px}.receipt-info{background:var(--primary-light);border-radius:var(--radius-sm);padding:16px;margin-bottom:24px}.receipt-info .label{display:block;font-size:12px;color:var(--text-hint);margin-bottom:4px}.receipt-info .value{font-size:18px;font-weight:600;font-family:Outfit,monospace;color:var(--primary)}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--error);color:#fff;padding:12px 20px;border-radius:var(--radius-sm);display:flex;align-items:center;gap:10px;font-size:14px;font-weight:500;box-shadow:0 8px 24px rgba(0,0,0,.3);z-index:1000;animation:slideUp .3s ease}@keyframes slideUp{from{opacity:0;transform:translateX(-50%) translateY(20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}.pay-footer{margin-top:auto;padding-top:32px;text-align:center}.pay-footer p{font-size:12px;color:var(--text-hint)}.loading{opacity:.7;pointer-events:none}@media (min-width:600px){.pay-container{padding:48px 24px}.pay-header h1{font-size:32px}}