:root{--navy:#0C447C;--muted:#6b7280}*{box-sizing:border-box;font-family:Inter,system-ui,Arial}body{margin:0;background:#fdf8f0;color:#111}.nav{background:var(--navy);color:#fff;display:flex;justify-content:space-between;align-items:center;padding:12px 20px}.brand{font-weight:700;font-size:18px}.nav-links a{color:#cfe6ff;margin-right:12px;text-decoration:none}.nav-links a.active{font-weight:700;text-decoration:underline}.nav-right{display:flex;gap:8px;align-items:center;white-space:nowrap}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:#0c447c;z-index:1000;height:65px}.bottom-nav a{color:#b5d4f4;text-decoration:none;display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;height:65px;font-size:12px;padding:0}.bottom-nav a.active{color:#fff;font-weight:700}.bottom-nav .nav-icon{font-size:20px;line-height:1;margin-bottom:4px}.bottom-nav .nav-label{font-size:10px;line-height:1.2}.container{padding:20px;max-width:1100px;margin:20px auto;background:#fdf8f0;border-radius:12px}.card{padding:16px;border-radius:8px;background:#fdf8f0;box-shadow:0 1px 2px #0000000d;margin-bottom:12px}.auth-page{display:flex;min-height:80vh;align-items:center;justify-content:center}.auth-page .card{width:360px}label{display:block;margin:8px 0;font-size:14px}.date-input{padding:8px 80px 8px 8px}input,select,textarea{width:100%;padding:8px;border:1px solid #ddd;border-radius:6px;background:#fdf8f0}.btn{background:var(--navy);color:#fff;padding:8px 12px;border:none;border-radius:6px;cursor:pointer}.btn.small{padding:6px 8px;font-size:13px}.students-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.student-card{border:1px solid #eee;padding:12px;border-radius:8px;display:flex;flex-direction:column;justify-content:space-between;background:#fdf8f0}.student-top{display:flex;gap:12px;align-items:center}.avatar{border-radius:999px;color:#fff;text-align:center;font-weight:700}.student-name{font-weight:600}.student-subject{color:var(--muted);font-size:13px}.form-card{max-width:720px}.form-actions{display:flex;gap:8px;margin-top:12px}.metrics-row{display:flex;gap:12px;margin-bottom:12px;flex-wrap:wrap}.metric-card{background:#f5edd8;padding:12px;border-radius:8px;flex:1;min-width:140px}.calendar-nav{display:flex;align-items:center;gap:12px;margin-bottom:12px}.calendar-weekdays{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-bottom:6px}.weekday{font-size:11px;color:#6b7280;text-align:center;padding:8px 0;border-bottom:1px solid #e5e7eb}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}.calendar-day{min-height:100px;border:1px dashed #eee;padding:8px;border-radius:6px;background:#fdf8f0}.pill{display:flex;gap:8px;align-items:center;padding:6px;border-radius:18px;border:1px solid transparent;margin-bottom:6px;cursor:pointer}.pill img{width:24px;height:24px;border-radius:50%}.invoice-row{display:flex;justify-content:space-between;align-items:center;background:#fdf8f0;padding:12px;border-radius:8px}.status-badge{padding:4px 10px;border-radius:999px;font-size:12px;font-weight:700;color:#1f2937;background:#d1d5db}.status-badge.overdue{background:#f87171;color:#861b1b}.status-badge.unpaid,.status-badge.sent{background:#fde68a;color:#92400e}.status-badge.paid{background:#d1fae5;color:#14532d}.btn.danger{background:transparent;color:#b91c1c;border:1px solid #b91c1c}.btn.danger:hover{background:#b91c1c1a}.success-message{margin:12px 0;padding:10px 14px;border:1px solid #d1fae5;background:#ecfdf5;color:#166534;border-radius:8px}.tabs button{margin-right:8px}.invoice-preview{max-width:850px;background:#fff;padding:40px;border-radius:0;margin:20px auto;box-shadow:none}.invoice-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:30px}.invoice-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;margin-bottom:16px}.invoice-head-meta{text-align:right;display:flex;flex-direction:column;gap:6px;font-size:14px;color:#111}.invoice-head-meta div{line-height:1.4}.invoice-table{width:100%;border-collapse:collapse}.invoice-table th,.invoice-table td{border:1px solid #eee;padding:8px;background:#fdf8f0}.color-picker{display:flex;gap:8px;margin-top:8px}.color-dot{width:28px;height:28px;border-radius:50%;border:2px solid transparent;cursor:pointer}.color-dot.selected{border-color:#111;box-shadow:0 0 0 3px #0000001f}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172aa6;display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}.modal{background:#fdf8f0;border-radius:16px;overflow:hidden;width:min(560px,100%);box-shadow:0 20px 50px #0f172a33;display:flex;flex-direction:column;max-height:90vh}.modal-header{background:#0c447c;color:#fff;padding:18px 20px;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;position:relative;z-index:2}.modal-header h3{margin:0;font-size:1.1rem}.modal-header p{margin:6px 0 0;color:#dbeafe}.modal-close{background:transparent;border:none;color:#fff;font-size:24px;line-height:1;cursor:pointer}.modal-body{padding:20px;background:#fdf8f0;display:grid;gap:16px;overflow-y:auto;max-height:80vh;flex:1 1 auto;min-height:0}.modal-row{display:flex;flex-direction:column;gap:6px}.modal-row label{font-size:13px;color:#374151}.modal-row input,.modal-row select,.modal-row textarea{width:100%;padding:10px;border:1px solid #d1d5db;border-radius:10px;font-size:14px}.modal-row textarea{min-height:100px;resize:vertical}.modal-footer{padding:16px 20px 20px;display:flex;justify-content:flex-end;gap:12px;background:#fdf8f0;position:relative;z-index:1}.error{color:#b00020;background:#fff0f0;padding:8px;border-radius:6px;margin-bottom:8px}@media (max-width:768px){body{font-size:14px;padding-left:16px;padding-right:16px;padding-bottom:90px}.container{margin:10px;padding-left:16px;padding-right:16px;padding-bottom:90px}.nav{display:flex;justify-content:space-between;align-items:center;padding:12px 16px}.nav-links{display:none!important}.nav-right{display:flex;align-items:center;gap:8px}.nav-right .user{font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bottom-nav{display:flex!important;position:fixed;bottom:0;left:0;right:0;height:65px;background:#0c447c}.bottom-nav a{color:#b5d4f4;height:65px;min-height:65px;flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0}.bottom-nav a.active{color:#fff}.card,.invoice-preview,.form-card{padding-bottom:16px}.students-grid{grid-template-columns:1fr}.metrics-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.metric-card{min-width:auto}.calendar-day{min-height:45px;padding:6px;font-size:9px}.weekday{padding:8px 0;font-size:9px}.pill{padding:10px;font-size:.95rem}.pill-text{font-size:.95rem}.form-card{max-width:100%}.form-card label{display:block;width:100%}input,select,textarea{font-size:14px;padding:12px;min-height:48px}.form-actions{display:flex;flex-direction:column;gap:10px;margin-top:16px}.btn{min-height:48px;min-width:0;width:100%}.btn.small{width:100%;padding:12px;font-size:14px}.invoice-row{flex-direction:column;align-items:flex-start;gap:10px}.invoice-row>div:first-child{width:100%}.invoice-row .status-badge{margin-top:4px}.invoice-row .btn,.invoice-row .btn.small{width:100%}.invoice-preview{max-width:100%;padding:16px}.invoice-info-grid{grid-template-columns:1fr;gap:20px}.invoice-actions{flex-direction:column}.invoice-actions .btn{width:100%}.calendar-weekdays,.calendar-grid{grid-template-columns:repeat(7,1fr);gap:4px}.modal{width:100%;max-width:100%;border-radius:14px}.modal-body{padding:16px}.modal-footer{flex-direction:column;align-items:stretch}}@media (min-width:769px){.bottom-nav{display:none!important}}@media print{@page{size:A4 portrait;margin:20mm}body{background:#fff}body *{visibility:hidden}#invoice-preview,#invoice-preview *{visibility:visible}#invoice-preview{position:absolute;top:0;left:0;width:100%;padding:0;margin:0;background:#fff!important}#invoice-preview .invoice-actions,#invoice-preview .btn{display:none!important}#invoice-preview .invoice-preview{box-shadow:none!important}.nav,.tabs,.form-card,.form-actions,.invoice-list,.invoice-totals,.success-message,header,footer{display:none!important}}
