:root{
  --bg:#f4f5f7; --panel:#fff; --border:#e2e4e9; --text:#1d2229; --muted:#6b7280;
  --primary:#1a5fb4; --primary-dark:#134a8f; --danger:#c0392b; --success:#1f8a4c;
  --radius:8px; --shadow:0 1px 3px rgba(0,0,0,.08);
  --gold:#C9982E; --silver:#8E9AAF; --platinum:#3E6E8E; --palladium:#4F8F6B; --rhodium:#7D5FBF;
  /* สีธีมปัจจุบัน (เปลี่ยนแบบไดนามิกด้วย JS เมื่อเลือกแท็บโลหะ) ค่าเริ่มต้น = สีหลักของระบบ */
  --accent: var(--primary);
  --accent-dark: var(--primary-dark);
}
*{box-sizing:border-box;}
body{margin:0;font-family:"Tahoma","Leelawadee UI","Segoe UI",sans-serif;background:var(--bg);color:var(--text);font-size:14px;}
h1,h2,h3{margin:0 0 8px;}
.hidden{display:none !important;}
.muted{color:var(--muted);}
.small{font-size:12px;}

/* ---------- Login ---------- */
.login-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a5fb4,#0d3a6e);}
.login-box{background:#fff;padding:32px;border-radius:12px;width:340px;box-shadow:0 10px 40px rgba(0,0,0,.25);}
.login-box h1{font-size:18px;color:var(--primary-dark);}
.login-box form{display:flex;flex-direction:column;gap:6px;margin-top:16px;}
.login-box label{font-size:12px;color:var(--muted);margin-top:6px;}
.login-box input{padding:10px;border:1px solid var(--border);border-radius:6px;font-size:14px;}
.login-box button{margin-top:16px;padding:10px;background:var(--primary);color:#fff;border:none;border-radius:6px;font-size:14px;cursor:pointer;}
.login-box button:hover{background:var(--primary-dark);}
.error-text{color:var(--danger);font-size:12px;min-height:16px;}

/* ---------- App shell ---------- */
.app{display:flex;min-height:100vh;}
.sidebar{width:220px;background:#111827;color:#fff;display:flex;flex-direction:column;flex-shrink:0;}
.brand{padding:18px 16px;border-bottom:1px solid #263042;}
.brand-title{font-weight:bold;font-size:15px;}
.brand-sub{font-size:12px;color:#9aa4b2;margin-top:2px;}
#nav{display:flex;flex-direction:column;padding:14px 10px;gap:5px;flex:1;}
.nav-item{
  background:none;
  border:none;
  border-left:3px solid transparent;
  color:#aab4c5;
  text-align:left;
  padding:12px 14px;
  border-radius:8px;
  cursor:pointer;
  font-size:13.8px;
  font-weight:500;
  letter-spacing:.2px;
  transition:background .15s ease, color .15s ease, border-color .15s ease, transform .12s ease;
}
.nav-item:hover{background:#1c2636;color:#fff;transform:translateX(2px);}
.nav-item.active{
  background:linear-gradient(90deg, rgba(26,95,180,.95), rgba(26,95,180,.55));
  color:#fff;
  border-left-color:#fff;
  font-weight:700;
  box-shadow:0 2px 10px rgba(26,95,180,.35);
}
.sidebar-footer{padding:12px 16px;border-top:1px solid #263042;font-size:12px;}
.user-info{color:#e5e7eb;margin-bottom:6px;}
.conn-status{margin-bottom:8px;color:#f39c12;}
.conn-status.online{color:#2ecc71;}
.btn-link{background:none;border:none;color:#9aa4b2;cursor:pointer;padding:0;font-size:12px;text-decoration:underline;}
.main-content{flex:1;padding:22px 28px;max-width:1400px;}

/* ---------- Common widgets ---------- */
.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:10px;}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:18px;}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px;}
.form-row{display:flex;flex-direction:column;gap:4px;margin-bottom:10px;}
.form-row label{font-size:12px;color:var(--muted);}
.form-row input, .form-row select, .form-row textarea{padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px;font-family:inherit;}
.form-inline{display:flex;gap:10px;flex-wrap:wrap;}
.form-inline .form-row{flex:1;min-width:140px;}

button, .btn{padding:9px 16px;border-radius:6px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:13.5px;}
button.primary{background:var(--primary);color:#fff;border-color:var(--primary);}
button.primary:hover{background:var(--primary-dark);}
button.danger{background:#fff0ef;color:var(--danger);border-color:#f2c1bd;}
button.success{background:#eafaf1;color:var(--success);border-color:#b7e6c9;}
button:disabled{opacity:.5;cursor:not-allowed;}
button.small-btn{padding:5px 10px;font-size:12px;}

table{width:100%;border-collapse:collapse;font-size:13px;}
th,td{padding:8px 10px;border-bottom:1px solid var(--border);text-align:left;white-space:nowrap;}
th{background:#f9fafb;color:var(--muted);font-weight:600;position:sticky;top:0;}
tbody tr:hover{background:#f7f9fc;}
.table-wrap{overflow-x:auto;}

.tag{display:inline-flex;align-items:center;gap:6px;padding:2px 8px;border-radius:20px;font-size:12px;font-weight:600;color:#fff;}
.color-dot{width:10px;height:10px;border-radius:50%;display:inline-block;flex-shrink:0;}

.badge{padding:2px 8px;border-radius:20px;font-size:11px;font-weight:600;}
.badge-yellow{background:#fef3c7;color:#92400e;}
.badge-green{background:#d1fae5;color:#065f46;}
.badge-gray{background:#e5e7eb;color:#374151;}

/* ป้ายนับถอยหลังช่วงเวลาที่ยังไม่ต้องกรอกรหัส PIN ซ้ำ (grace period 1 นาที) มุมขวาบน */
.emp-pin-countdown{
  position:fixed;top:14px;right:18px;background:#111827;color:#fff;padding:7px 16px;border-radius:20px;
  font-size:12.5px;font-weight:600;box-shadow:0 2px 10px rgba(0,0,0,.28);z-index:1200;
  opacity:0;pointer-events:none;transform:translateY(-4px);transition:opacity .2s ease, transform .2s ease;
}
.emp-pin-countdown.show{opacity:1;transform:translateY(0);}

.toast-container{position:fixed;top:16px;right:16px;display:flex;flex-direction:column;gap:8px;z-index:9999;}
.toast{padding:10px 16px;border-radius:6px;color:#fff;font-size:13px;box-shadow:var(--shadow);min-width:220px;animation:fadein .15s;}
.toast.success{background:#1f8a4c;}
.toast.error{background:#c0392b;}
.toast.info{background:#374151;}
@keyframes fadein{from{opacity:0;transform:translateY(-6px);}to{opacity:1;transform:translateY(0);}}

.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:1000;}
.modal-box{background:#fff;border-radius:10px;padding:22px;width:520px;max-width:92vw;max-height:88vh;overflow:auto;}
.modal-box h3{margin-bottom:14px;}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px;}

/* กล่อง modal ขนาดเล็กกะทัดรัด ใช้กับ modal ยืนยันรหัส (PIN/รหัสผู้มีสิทธิ์) ที่ไม่ต้องการพื้นที่กว้างแบบฟอร์มทั่วไป */
.modal-box.modal-sm{width:300px;text-align:center;}
.modal-box.modal-sm h3{font-size:21px;margin-bottom:20px;}
.modal-box.modal-sm .modal-actions{justify-content:center;}

/* ช่องกรอกรหัส PIN / รหัสผู้มีสิทธิ์ ให้ดูโดดเด่นและกดง่าย */
.pin-code-input{
  width:150px;padding:12px 10px;font-size:24px;font-weight:600;letter-spacing:8px;text-align:center;
  border:2px solid var(--border);border-radius:10px;margin:0 auto;display:block;background:#f9fafb;
  transition:border-color .15s, box-shadow .15s, background .15s;
}
.pin-code-input:focus{outline:none;border-color:var(--primary);background:#fff;box-shadow:0 0 0 4px rgba(26,95,180,.15);}

.summary-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:18px;}
.summary-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;border-left:5px solid var(--primary);}
.summary-card .label{font-size:12px;color:var(--muted);}
.summary-card .value{font-size:20px;font-weight:700;margin-top:4px;}

.checkbox-cell{width:30px;text-align:center;}

.auto-info-strip{display:flex;gap:28px;align-items:center;padding:10px 14px;background:#f7f8fa;border-radius:6px;margin-bottom:14px;border:1px solid var(--border);}
.auto-info-strip b{font-size:14px;}

/* ---------- หน้าบันทึกซื้อขาย: ตัวหนังสือใหญ่ขึ้น กรอกข้อมูลสะดวกขึ้น ใช้เมาส์ให้น้อยที่สุด ---------- */
#tx-main-panel .form-row label{font-size:14px;}
#tx-main-panel .form-row input, #tx-main-panel .form-row select, #tx-main-panel .form-row textarea{
  padding:10px 14px;font-size:21px;font-weight:600;border-radius:10px;border:1.5px solid var(--border);
  transition:border-color .15s, box-shadow .15s;
}
#tx-main-panel .form-row input:focus, #tx-main-panel .form-row select:focus, #tx-main-panel .form-row textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
#tx-main-panel .auto-info-strip b{font-size:17px;}
#tx-main-panel .summary-card .label{font-size:13px;}
#tx-main-panel .summary-card .value{font-size:24px;}
#tx-main-panel button[type="submit"]{font-size:16px;padding:12px 22px;}
#tx-main-panel .tag{font-size:14px;padding:6px 12px;}

/* ---------- รูปถ่ายลูกค้า + ค้นหาลูกค้าเก่า ---------- */
.customer-photo-box{
  width:96px;height:120px;border:1px dashed var(--border);border-radius:6px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;overflow:hidden;background:#f7f7f7;
  font-size:11px;color:var(--muted);text-align:center;padding:4px;
}
.customer-photo-box img{width:100%;height:100%;object-fit:cover;}
.customer-search-dropdown{
  position:absolute;top:100%;left:0;right:0;background:#fff;border:1px solid var(--border);
  border-radius:6px;box-shadow:var(--shadow);max-height:240px;overflow-y:auto;z-index:60;margin-top:2px;
}
.customer-search-item{padding:8px 10px;cursor:pointer;font-size:13px;border-bottom:1px solid var(--border);}
.customer-search-item:last-child{border-bottom:none;}
.customer-search-item:hover{background:#f2f5fa;}
.customer-search-item .csi-name{font-weight:600;}
.customer-search-item .csi-meta{color:var(--muted);font-size:11px;margin-top:1px;}

/* ช่อง "ค้นหาด้วย" ลูกค้าเก่า ให้เล็กกว่าช่องกรอกข้อมูลอื่นๆ เสมอ ไม่ว่าหน้าไหน (ทับสไตล์ใหญ่ของ #tx-main-panel ได้) */
#tx-main-panel input.cust-search-input,
#bars-main-panel input.cust-search-input,
#tk-main-panel input.cust-search-input {
  font-size:13.5px;font-weight:400;padding:7px 10px;border-radius:6px;max-width:460px;
}

/* ---------- ธีมสีตามโลหะที่เลือก (เปลี่ยน --accent ผ่าน JS เมื่อคลิกแท็บโลหะ) ---------- */
.metal-theme-band{
  background:linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, #000 15%));
  color:#fff;padding:12px 18px;border-radius:var(--radius) var(--radius) 0 0;margin:-18px -18px 18px -18px;
  display:flex;align-items:center;gap:10px;font-weight:700;font-size:15px;
  transition:background .2s ease;
}
.metal-theme-band .metal-swatch{width:14px;height:14px;border-radius:50%;background:#fff;opacity:.9;}
.panel.metal-panel{
  border-top:4px solid var(--accent);
  background:color-mix(in srgb, var(--accent) 5%, #ffffff);
  transition:border-color .2s ease, background .2s ease;
}
button.accent{background:var(--accent);color:#fff;border-color:var(--accent);}
button.accent:hover{background:var(--accent-dark);}
#calc-preview .summary-card:first-child{
  border-left-color:var(--accent);
  background:color-mix(in srgb, var(--accent) 6%, #ffffff);
}
#metal-tabs .tag{transition:transform .12s ease;}
#metal-tabs .tag:hover{transform:translateY(-1px);}

@media print{
  body *{visibility:hidden;}
  #print-area, #print-area *{visibility:visible;}
  #print-area{position:absolute;left:0;top:0;width:100%;}
}