/* E-Certificate Generator Studio - Modern CSS Design System */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@500;700&family=Great+Vibes&family=Inter:wght@300;400;500;600;700&family=Montserrat:wght@400;600;700&family=Outfit:wght@400;600;700&family=Playfair+Display:ital,wght@0,600;0,700;1,400&family=Pinyon+Script&display=swap');

:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --accent-gold: #f59e0b;
  --accent-emerald: #10b981;
  --danger: #ef4444;
  --sidebar-width: 440px;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-main: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header */
.app-header {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

.brand-title h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-title p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 0.75rem;
}

/* Main Layout */
.app-container {
  display: flex;
  flex: 1;
  height: calc(100vh - 73px);
  overflow: hidden;
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 10;
}

/* Navigation Tabs */
.sidebar-tabs {
  display: flex;
  background: rgba(15, 23, 42, 0.6);
  padding: 0.5rem;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 0.6rem 0.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  transition: all 0.2s ease;
}

.tab-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: var(--primary);
  background: rgba(59, 130, 246, 0.15);
}

/* Tab Content Areas */
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Form Groups & Cards */
.panel-section {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-gold);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 0.85rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-input, .form-select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.85rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
}

/* File Drop Area */
.file-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: rgba(15, 23, 42, 0.3);
}

.file-dropzone:hover, .file-dropzone.dragover {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.05);
}

.dropzone-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.dropzone-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.dropzone-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Range Slider with value display */
.slider-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slider-container input[type="range"] {
  flex: 1;
  accent-color: var(--primary);
}

.slider-val {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  min-width: 45px;
  text-align: right;
}

/* Color Pickers */
.color-picker-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-input {
  width: 40px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
}

/* Template Grid Selector */
.template-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.template-card {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
  background: #0f172a;
}

.template-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-muted);
}

.template-card.active {
  border-color: var(--accent-gold);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
}

.template-preview-img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  display: block;
}

.template-card-name {
  padding: 0.4rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.template-card.active::after {
  content: '✓';
  position: absolute;
  top: 6px;
  right: 6px;
  background: var(--accent-gold);
  color: #000;
  font-weight: bold;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

/* Main Preview Area */
.app-main {
  flex: 1;
  background: #090d16;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.preview-toolbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.preview-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.data-badge {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.recipient-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-btn {
  background: #0f172a;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Canvas Viewport */
.canvas-wrapper {
  flex: 1;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  position: relative;
}

.canvas-container {
  box-shadow: var(--shadow-main);
  border-radius: 8px;
  overflow: hidden;
  background: #ffffff;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

#certificateCanvas {
  display: block;
  max-width: 100%;
  max-height: 72vh;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.45);
  transform: translateY(-1px);
}

.btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.45);
  transform: translateY(-1px);
}

.btn-gold {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-gold:hover {
  box-shadow: 0 6px 16px rgba(245, 158, 11, 0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.78rem;
}

.btn-full {
  width: 100%;
}

/* Modal Overlay for Progress */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow-main);
  text-align: center;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.modal-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.progress-bar-bg {
  width: 100%;
  height: 12px;
  background: #0f172a;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border-color);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #3b82f6, #10b981);
  transition: width 0.15s ease;
}

.progress-status {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

/* Data Table Modal / Preview Table */
.data-table-container {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background: #0f172a;
  color: var(--text-muted);
  position: sticky;
  top: 0;
}

/* Responsive */
@media (max-width: 1024px) {
  .app-container {
    flex-direction: column;
    height: auto;
    overflow: visible;
  }
  .app-sidebar {
    width: 100%;
  }
  #certificateCanvas {
    max-height: 50vh;
  }
}