/* ===========================
   বাকি-হিসাব PRO – style.css
   পেশাদার UI/UX, মোবাইল-প্রথম
   =========================== */

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --secondary: #1e293b;
  --success: #10b981;
  --danger: #ef4444;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --text: #1e293b;
  --muted: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  --radius: 18px;
  --radius-sm: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 70px;
  -webkit-tap-highlight-color: transparent;
  line-height: 1.5;
}

/* ===== লোডার ===== */
.loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}
.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== হেডার ===== */
header {
  background: linear-gradient(135deg, var(--secondary), #334155);
  color: white;
  padding: 18px 20px 22px;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow);
  position: relative;
  z-index: 10;
}
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.logo {
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}
.logo i { font-size: 1.5rem; opacity: 0.9; }
.logo strong { color: #fbbf24; }
.header-actions {
  display: flex;
  gap: 10px;
}
.icon-btn {
  background: rgba(255,255,255,0.15);
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover {
  background: rgba(255,255,255,0.3);
  transform: scale(1.05);
}

/* গ্লোবাল সার্চ বার */
.search-bar-header {
  display: flex;
  align-items: center;
  background: white;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  margin-bottom: 16px;
  transition: all 0.3s ease;
}
.search-bar-header i { color: var(--muted); margin-right: 8px; }
.search-bar-header input {
  border: none;
  width: 100%;
  font-size: 0.95rem;
  outline: none;
  background: transparent;
}
.hidden { display: none !important; }

/* স্ট্যাটাস কার্ড */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.stat-card {
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  padding: 14px 12px;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: transform 0.2s;
}
.stat-card:hover { transform: translateY(-2px); }
.stat-card i { font-size: 1.1rem; display: block; opacity: 0.8; margin-bottom: 4px; }
.stat-card span { font-size: 0.75rem; opacity: 0.9; display: block; }
.stat-card strong { display: block; font-size: 1.3rem; margin-top: 2px; }
.stat-card.warning i { color: #fbbf24; }

/* ===== নিচের ন্যাভ ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--card-bg);
  display: flex;
  justify-content: space-around;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
  border-radius: 20px 20px 0 0;
  padding: 6px 0;
  z-index: 100;
}
.bottom-nav button {
  flex: 1;
  padding: 8px 4px;
  border: none;
  background: none;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: color 0.2s, background 0.2s;
  border-radius: var(--radius-sm);
}
.bottom-nav button i { font-size: 1.2rem; }
.bottom-nav button.active-tab {
  color: var(--primary);
  background: #eef2ff;
  font-weight: 600;
}

/* ===== মেইন কন্টেন্ট ===== */
main {
  padding: 16px;
  padding-bottom: 80px; /* nav-এর জায়গা */
}

section {
  background: var(--card-bg);
  padding: 20px 18px;
  border-radius: var(--radius);
  margin-bottom: 18px;
  box-shadow: var(--shadow);
  animation: fadeSlideIn 0.3s ease;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

h3, h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-weight: 600;
}
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; margin-top: 10px; }

/* ===== হোম : ফিল্টার চিপ ===== */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.filter-chips {
  display: flex;
  gap: 8px;
}
.chip {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* হরাইজন্টাল স্ক্রল (বাকি পাওনা / নতুন কাস্টমার) */
.horizontal-scroll {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.horizontal-scroll > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

/* ছোট কার্ড (কাস্টমার) */
.cust-card {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 12px;
  min-width: 150px;
  box-shadow: 0 2px 7px rgba(0,0,0,0.04);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border);
}
.cust-card:hover { transform: translateY(-3px); box-shadow: 0 8px 15px rgba(0,0,0,0.08); }
.cust-card .name { font-weight: 600; font-size: 0.9rem; }
.cust-card .mobile { font-size: 0.75rem; color: var(--muted); margin: 2px 0; }
.cust-card .due { color: var(--danger); font-weight: 700; font-size: 0.9rem; }

/* মেমো কার্ড (হোম ও লিস্ট) */
.list-container { margin-top: 5px; }
.memo-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.2s;
  border-radius: var(--radius-sm);
}
.memo-card:last-child { border-bottom: none; }
.memo-card:hover { background: #f8fafc; }
.memo-card .memo-info strong { font-size: 0.95rem; display: block; }
.memo-card .memo-info small { color: var(--muted); font-size: 0.75rem; }
.memo-card .amount { text-align: right; font-weight: 700; }
.memo-card .amount .due { color: var(--danger); font-size: 0.75rem; font-weight: 600; }

/* ===== কাস্টমার / পণ্য লিস্ট আইটেম ===== */
.list-item {
  display: flex;
  align-items: center;
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
  cursor: pointer;
}
.list-item:last-child { border-bottom: none; }
.list-item:hover { background: #f8fafc; }
.list-item img {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  margin-right: 12px;
  background: var(--bg);
  border: 2px solid var(--border);
}
.list-item .info { flex: 1; }
.list-item .name { font-weight: 600; font-size: 0.95rem; }
.list-item .meta { font-size: 0.8rem; color: var(--muted); }
.list-item .actions {
  display: flex;
  gap: 10px;
  margin-left: 8px;
}
.list-item .actions button {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.1rem;
  cursor: pointer;
  transition: color 0.2s;
}
.list-item .actions button:hover { color: var(--primary); }

/* ===== ফর্ম ===== */
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border 0.2s, box-shadow 0.2s;
  background: var(--card-bg);
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}
.file-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1.5px dashed var(--primary);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  cursor: pointer;
  color: var(--primary);
  font-weight: 500;
  background: #f8fafc;
}
.file-label input[type="file"] { display: none; }
.preview-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  margin-bottom: 12px;
  display: block; /* জাভাস্ক্রিপ্ট দিয়েও কন্ট্রোল করবে */
}

/* বাটন */
.btn-primary,
.btn-accent,
.btn-outline,
.btn-secondary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
  margin-top: 10px;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-accent { background: var(--success); color: white; }
.btn-accent:hover { background: #059669; }
.btn-outline {
  background: transparent;
  border: 2px dashed var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: #eef2ff; }
.btn-secondary {
  background: #e2e8f0;
  color: var(--text);
}
.btn-secondary:hover { background: #cbd5e1; }

/* সার্চ বক্স */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  margin: 15px 0;
  border: 1px solid var(--border);
}
.search-box i { color: var(--muted); margin-right: 10px; }
.search-box input {
  border: none;
  background: transparent;
  font-size: 0.95rem;
  width: 100%;
  outline: none;
}

/* ===== মেমো টেবিল ===== */
.table-container {
  margin: 15px 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.table-header,
.product-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr 1.5fr 0.5fr;
  gap: 6px;
  padding: 12px 10px;
  align-items: center;
  font-size: 0.85rem;
}
.table-header {
  background: #f8fafc;
  font-weight: 600;
  color: var(--muted);
}
.product-row {
  border-top: 1px solid var(--border);
}
.product-row input,
.product-row select {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  background: white;
}
.product-row input:focus,
.product-row select:focus {
  outline: none;
  border-color: var(--primary);
}
.product-row .remove-btn {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 1.2rem;
  cursor: pointer;
}

/* মেমো সারাংশ */
.summary {
  background: #f8fafc;
  padding: 16px;
  border-radius: var(--radius-sm);
  margin-top: 15px;
  border: 1px solid var(--border);
}
.summary > div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 0.95rem;
}
.discount-row input,
.paid-row input {
  width: 100px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: right;
  font-weight: 600;
}
.due-display {
  padding: 10px;
  background: #fff1f2;
  color: var(--danger);
  font-weight: 700;
  border-radius: 8px;
  text-align: center;
  margin-top: 8px;
  font-size: 1.1rem;
}

/* ===== বিস্তারিত পেজ (কাস্টমার/পণ্য) ===== */
.back-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.back-btn:hover { text-decoration: underline; }
.detail-header {
  display: flex;
  gap: 16px;
  margin-bottom: 18px;
  align-items: center;
}
.detail-avatar {
  width: 75px;
  height: 75px;
  border-radius: 20px;
  object-fit: cover;
  border: 2px solid var(--border);
}
.detail-header h3 { margin-bottom: 4px; }
.detail-header p { font-size: 0.9rem; color: var(--muted); }
.detail-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #f8fafc;
  padding: 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 10px;
  border: 1px solid var(--border);
}
.detail-stats span { font-weight: 500; }
.text-danger { color: var(--danger); font-weight: 700; }

/* ===== মোডাল ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(3px);
}
.modal-content {
  background: white;
  padding: 24px;
  border-radius: var(--radius);
  width: 90%;
  max-width: 420px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
  animation: modalPop 0.25s ease;
}
@keyframes modalPop {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.modal-content h3 {
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.modal-content input {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 1rem;
}
.modal-content input:focus {
  outline: none;
  border-color: var(--primary);
}

/* ক্যালকুলেটর মোডাল */
.calc-body { text-align: center; }
#calcScreen {
  width: 100%;
  padding: 16px;
  font-size: 1.6rem;
  text-align: right;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
  background: #f8fafc;
  font-weight: 600;
}
.calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 10px 0 15px;
}
.calc-buttons button {
  padding: 16px 4px;
  font-size: 1.2rem;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--bg);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.calc-buttons button:hover { background: #e2e8f0; }
.calc-buttons button.operator { background: #e0e7ff; color: var(--primary); }
.calc-buttons button.equal {
  background: var(--primary);
  color: white;
  grid-column: span 2;
}

/* ===== টোস্ট ===== */
.toast {
  position: fixed;
  bottom: 85px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--secondary);
  color: white;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 500;
  font-size: 0.95rem;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  white-space: nowrap;
}
.toast.show { opacity: 1; }

/* ===== খালি অবস্থা ===== */
.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 20px;
  font-size: 0.9rem;
}

/* ===== প্রিন্ট স্টাইল ===== */
@media print {
  .bottom-nav,
  header,
  .btn-primary,
  .btn-accent,
  .btn-outline,
  .btn-secondary,
  .file-label,
  .search-box,
  .list-container,
  .preview-img,
  .table-container .remove-btn,
  .modal,
  .toast,
  .loader-overlay,
  .back-btn,
  .filter-chips,
  .header-actions,
  #searchBar { display: none !important; }

  body { background: white; padding-bottom: 0; }
  section { box-shadow: none; border: none; margin: 0; padding: 10px; }
  #memo-sec { display: block !important; }
}