:root {
  --font-main: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-bg-subtle: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.75);
  --glass-border-subtle: rgba(255, 255, 255, 0.4);
  --glass-shadow: 0 16px 40px -12px rgba(24, 39, 75, 0.12), 0 2px 6px -1px rgba(24, 39, 75, 0.04);
  --glass-specular: inset 0 1px 1px 0 rgba(255, 255, 255, 0.95);
  --primary-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
  --primary-glow: rgba(37, 99, 235, 0.25);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-main);
  color: var(--text-main);
  min-height: 100vh;
  background: linear-gradient(135deg, #e0f2fe 0%, #ede9fe 35%, #fce7f3 70%, #f0fdf4 100%);
  background-attachment: fixed;
  position: relative;
  overflow-x: hidden;
}

/* Liquid Glass ambient mesh glow orbs */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
  animation: floatOrb 18s ease-in-out infinite alternate;
}
.orb-1 {
  top: -8%;
  left: -5%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(147, 197, 253, 0.8), rgba(191, 219, 254, 0.2));
}
.orb-2 {
  bottom: 10%;
  right: -8%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(216, 180, 254, 0.75), rgba(243, 232, 255, 0.2));
  animation-delay: -6s;
}
.orb-3 {
  top: 40%;
  left: 45%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(167, 243, 208, 0.65), rgba(209, 250, 229, 0.15));
  animation-delay: -11s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.08); }
  100% { transform: translate(-30px, 45px) scale(0.95); }
}

/* Container */
.app-wrapper {
  position: relative;
  z-index: 1;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* Header & Liquid Glass Bar */
.top-navbar {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), var(--glass-specular);
  border-radius: 20px;
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #0f172a;
  line-height: 1.2;
}

.logo-subtitle {
  font-size: 0.8rem;
  color: var(--text-sub);
  font-weight: 500;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Liquid Glass Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
  font-family: inherit;
}

.btn-glass {
  background: rgba(255, 255, 255, 0.65);
  color: #1e293b;
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}
.btn-glass:hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.btn-glass.active {
  background: #0f172a;
  color: #ffffff;
  border-color: #0f172a;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--primary-glow), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

.btn-success {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}
.btn-success:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-excel {
  background: linear-gradient(135deg, #15803d 0%, #22c55e 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.25);
}
.btn-excel:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border-color: rgba(239, 68, 68, 0.2);
}
.btn-danger:hover {
  background: #dc2626;
  color: #ffffff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 9px;
}

/* Liquid Glass Cards */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), var(--glass-specular);
  border-radius: 20px;
  padding: 24px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9), transparent);
  pointer-events: none;
}

/* Training Info Banner Card */
.training-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.85) 0%, rgba(240, 249, 255, 0.75) 100%);
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.banner-info {
  flex: 1;
  min-width: 260px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(37, 99, 235, 0.12);
  color: #1d4ed8;
  border: 1px solid rgba(37, 99, 235, 0.2);
  margin-bottom: 8px;
}

.training-title-text {
  font-size: 1.45rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  line-height: 1.3;
}

.training-meta-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.banner-stats {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-pill {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 14px;
  padding: 10px 18px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: #2563eb;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-sub);
  font-weight: 600;
  margin-top: 3px;
}

/* Tab Panels */
.view-panel {
  display: none;
}
.view-panel.active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 8px;
}

.form-label .required {
  color: #ef4444;
  margin-left: 4px;
}

.input-text, .select-custom {
  width: 100%;
  padding: 13px 16px;
  font-size: 0.95rem;
  font-family: inherit;
  color: #0f172a;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(203, 213, 225, 0.8);
  border-radius: 14px;
  outline: none;
  transition: all 0.2s;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}
.input-text:focus, .select-custom:focus {
  background: #ffffff;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

/* Quick Select Chips */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.chip-item {
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(203, 213, 225, 0.7);
  color: #334155;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.chip-item:hover {
  background: #ffffff;
  border-color: #94a3b8;
  transform: translateY(-1px);
}
.chip-item.selected {
  background: #2563eb;
  border-color: #2563eb;
  color: #ffffff;
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.3);
}

/* Preset Member Selection Cards / Chips */
.member-chip-card {
  padding: 8px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
  border: 1.5px solid #cbd5e1;
  color: #1e293b;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  user-select: none;
}
.member-chip-card:hover {
  border-color: #3b82f6;
  background: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.15);
}
.member-chip-card.is-signed {
  background: rgba(240, 253, 244, 0.9);
  border-color: #86efac;
  color: #166534;
}
.member-chip-card.is-active {
  background: #2563eb;
  border-color: #1d4ed8;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}
.member-chip-card.is-active .badge-role {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}
.member-chip-card.is-active .status-dot {
  background: #ffffff !important;
}

.badge-role {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 6px;
  background: #f1f5f9;
  color: #475569;
}

/* Excel Drag & Drop Zone */
.excel-drop-zone {
  border: 2px dashed #93c5fd;
  border-radius: 16px;
  background: rgba(239, 246, 255, 0.6);
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.excel-drop-zone:hover, .excel-drop-zone.dragover {
  background: rgba(219, 234, 254, 0.85);
  border-color: #2563eb;
  transform: scale(1.005);
}

/* Signature Canvas Box */
.signature-card-box {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(203, 213, 225, 0.9);
  border-radius: 16px;
  padding: 12px;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.signature-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 190px;
  border-radius: 12px;
  background: #ffffff;
  border: 1.5px dashed #cbd5e1;
  overflow: hidden;
  touch-action: none;
  cursor: crosshair;
}

.signature-canvas-wrapper.has-sign {
  border-style: solid;
  border-color: #93c5fd;
}

#sigCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.sig-placeholder-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  color: #94a3b8;
  font-size: 0.95rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  user-select: none;
  transition: opacity 0.2s;
}
.sig-placeholder-text.hidden {
  opacity: 0;
}

.sig-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding-top: 4px;
}

.sig-status-hint {
  font-size: 0.8rem;
  color: var(--text-sub);
}

/* Submit Action Area */
.submit-actions {
  margin-top: 26px;
}

.btn-large-submit {
  width: 100%;
  padding: 16px;
  font-size: 1.1rem;
  border-radius: 16px;
}

/* Registration Result Card */
.result-banner {
  display: none;
  background: linear-gradient(135deg, rgba(236, 253, 245, 0.9) 0%, rgba(209, 250, 229, 0.8) 100%);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 16px;
  padding: 18px 20px;
  margin-top: 20px;
  animation: slideDown 0.3s ease-out;
}
.result-banner.show {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Attendance Table & List */
.table-container {
  overflow-x: auto;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 16px;
  border: 1px solid rgba(226, 232, 240, 0.9);
}

.attend-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.attend-table th {
  background: rgba(241, 245, 249, 0.85);
  color: #334155;
  font-weight: 700;
  padding: 14px 16px;
  border-bottom: 1px solid #cbd5e1;
  white-space: nowrap;
}

.attend-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  vertical-align: middle;
  color: #1e293b;
}

.attend-table tr:hover td {
  background: rgba(248, 250, 252, 0.6);
}

.sig-thumb {
  height: 38px;
  max-width: 110px;
  object-fit: contain;
  background: #ffffff;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
  padding: 2px 4px;
}

/* Modals */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-overlay.open {
  display: flex;
  animation: modalFade 0.2s ease-out;
}

@keyframes modalFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-box {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(30px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  border-radius: 24px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 28px;
  position: relative;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
}

.close-btn {
  background: transparent;
  border: none;
  color: #64748b;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
}
.close-btn:hover {
  background: #f1f5f9;
  color: #0f172a;
}

/* Toast Notification */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #0f172a;
  color: #ffffff;
  padding: 12px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  z-index: 10000;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
#toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Code Block for Apps Script Guide */
.code-container {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 12px;
  padding: 14px;
  font-family: monospace;
  font-size: 0.8rem;
  line-height: 1.5;
  overflow-x: auto;
  margin: 12px 0;
  position: relative;
  max-height: 240px;
  overflow-y: auto;
}

.copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: none;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
}
.copy-code-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Printable Standard A4 Format (For PDF & Window Print) */
#printArea {
  display: none;
}

@media print {
  body * {
    visibility: hidden;
  }
  #printArea, #printArea * {
    visibility: visible;
  }
  #printArea {
    display: block !important;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    background: #ffffff;
    color: #000000;
    padding: 20px;
    box-shadow: none;
  }
}

.print-doc {
  background: #ffffff;
  color: #111827;
  padding: 24px;
  font-family: var(--font-main);
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.print-title {
  text-align: center;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 2px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid #111827;
}

.print-meta-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}
.print-meta-table th, .print-meta-table td {
  border: 1px solid #94a3b8;
  padding: 8px 12px;
  font-size: 13px;
}
.print-meta-table th {
  background: #f1f5f9;
  width: 20%;
  text-align: center;
  font-weight: 700;
}

.print-attend-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}
.print-attend-table th, .print-attend-table td {
  border: 1px solid #475569;
  padding: 10px 8px;
  font-size: 12px;
  text-align: center;
}
.print-attend-table th {
  background: #f8fafc;
  font-weight: 700;
}

.print-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 30px;
  margin-top: 30px;
  font-size: 14px;
}
.print-sign-box {
  display: inline-block;
  width: 80px;
  height: 40px;
  border-bottom: 1px solid #000000;
}

/* Responsive Adjustments */
@media (max-width: 640px) {
  .app-wrapper {
    padding: 16px 12px 40px;
  }
  .top-navbar {
    padding: 14px 16px;
  }
  .glass-card {
    padding: 18px 16px;
    border-radius: 16px;
  }
  .training-title-text {
    font-size: 1.2rem;
  }
  .signature-canvas-wrapper {
    height: 160px;
  }
  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }
  .btn-glass {
    flex: 1;
    padding: 8px 8px;
    font-size: 0.78rem;
  }
}