:root{--blue: #3169af;--blue-dark: #1f4f8a;--ink: #1a2332;--muted: #5c6b80;--line: #e4eaf1;--bg: #f4f7fb;--card: #ffffff;--radius: 12px;font-family:IBM Plex Sans Thai,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font-family:inherit}button{cursor:pointer}.app{display:flex;min-height:100vh}.side{width:220px;background:#fff;border-right:1px solid var(--line);padding:20px 14px;display:flex;flex-direction:column;gap:4px}.brand{display:flex;align-items:center;gap:10px;padding:0 8px 16px}.brand img{height:28px}.brand b{display:block;font-size:15px}.brand span{font-size:12px;color:var(--muted)}.nav-btn{text-align:left;border:0;background:transparent;padding:10px 12px;border-radius:10px;color:var(--ink);font-size:14px}.nav-btn.active{background:#eaf1fb;color:var(--blue);font-weight:600}.main{flex:1;padding:28px 32px;max-width:1100px}h1{font-size:24px;margin:0 0 4px}.sub{color:var(--muted);margin:0 0 20px;font-size:14px}.row{display:flex;gap:12px;flex-wrap:wrap}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}.stat{flex:1;min-width:140px}.stat b{font-size:22px;display:block}.stat span{color:var(--muted);font-size:13px}.btn{background:var(--blue);color:#fff;border:0;border-radius:10px;padding:10px 16px;font-weight:600}.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.sm{padding:6px 10px;font-size:13px}label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:#fff;font-size:14px}.field{margin-bottom:12px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.grid-3{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:20px}table{width:100%;border-collapse:collapse;font-size:14px}th{text-align:left;font-size:12px;color:var(--muted);padding:8px;border-bottom:1px solid var(--line)}td{padding:8px;border-bottom:1px solid var(--line)}.list-item{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}.muted{color:var(--muted);font-size:13px}.sheet{width:794px;min-height:1123px;background:#fff;color:#111;padding:36px 40px;box-shadow:0 8px 30px #00000014}.sheet-head{background:var(--blue);color:#fff;margin:-36px -40px 24px;padding:28px 40px;display:flex;justify-content:space-between;align-items:flex-start}.sheet-head img{height:56px}.sheet-word{font-weight:700;letter-spacing:1px;font-size:22px}.sheet-name{font-size:14px;opacity:.95}.sheet-sub{font-size:12px;opacity:.85;margin:6px 0 0;line-height:1.4}.sheet-title{text-align:right}.sheet-title .kicker{font-size:12px;letter-spacing:2px;opacity:.8}.sheet-title h1{margin:0;font-size:28px;color:#fff}.sheet-title p{margin:4px 0 0;font-size:13px;opacity:.9}.meta{display:flex;justify-content:space-between;font-size:13px;margin-bottom:16px}.meta-right{text-align:right}.meta span{color:#666;margin-right:6px}.customer-box{background:#f4f7fb;border-radius:10px;padding:14px 16px;margin-bottom:16px}.customer-box .lbl{font-size:12px;color:#666}.sheet table th{background:var(--blue);color:#fff;font-weight:500}.sheet table td,.sheet table th{padding:8px 10px}.totals{width:280px;margin-left:auto;font-size:14px}.totals div{display:flex;justify-content:space-between;padding:4px 0}.totals .strong{background:#eaf1fb;font-weight:700;padding:8px;border-radius:6px}.baht{text-align:right;font-size:12px;color:#555;margin-top:4px}.signs{display:flex;justify-content:space-around;margin-top:60px;font-size:13px;text-align:center}.signs div{border-top:1px solid #ccc;padding-top:8px;width:180px}.choice{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:8px;background:#fff;text-align:left;width:100%}.choice.on{border-color:var(--blue);background:#eaf1fb}@media(max-width:900px){.app{flex-direction:column}.side{width:100%;flex-direction:row;overflow-x:auto;border-right:0;border-bottom:1px solid var(--line)}.main{padding:16px}.grid-2,.grid-3{grid-template-columns:1fr}.sheet{width:100%;min-height:auto;padding:20px}.sheet-head{margin:-20px -20px 16px;padding:16px;flex-direction:column}}