/* Flat, High-Contrast, AI-Slop-Free Design System */
:root {
  --bg-dark: #0D0F14;
  --panel-bg: #141720;
  --panel-border: 1px solid rgba(255, 255, 255, 0.1);
  --input-bg: #0A0C10;
  
  --primary: #6366F1;
  --primary-hover: #4F46E5;
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --valid-color: #10B981;
  --invalid-color: #EF4444;
  --rate-color: #F59E0B;
  --error-color: #8B5CF6;
  
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 4px;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* App Wrapper */
.app-wrapper {
  max-width: 1360px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  gap: 20px;
}

/* Flat Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--panel-bg);
  border: var(--panel-border);
  border-radius: var(--radius-lg);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.tech-badge {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mode-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.select-mode {
  background: var(--input-bg);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.select-mode:hover {
  border-color: var(--primary);
}

/* Workspace Grid */
.main-workspace {
  display: grid;
  grid-template-columns: 390px 1fr;
  gap: 20px;
  flex: 1;
}

@media (max-width: 1024px) {
  .main-workspace {
    grid-template-columns: 1fr;
  }
}

/* Solid Flat Panel */
.panel {
  background: var(--panel-bg);
  border: var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.panel-head h2 {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.pill-badge {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 500;
}

/* File Upload Dropzone */
.file-upload-dropzone {
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
  background: var(--input-bg);
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: border-color 0.2s;
}

.file-upload-dropzone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

.btn-file-import {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.85rem;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.btn-file-import:hover {
  background: rgba(255, 255, 255, 0.12);
}

.file-tip {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Textarea input */
.textarea-container {
  flex: 1;
  min-height: 180px;
  margin-bottom: 14px;
  display: flex;
}

textarea {
  width: 100%;
  height: 100%;
  min-height: 180px;
  background: var(--input-bg);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 12px;
  resize: vertical;
  outline: none;
  line-height: 1.6;
}

textarea:focus {
  border-color: var(--primary);
}

/* Controls */
.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 12px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.select-small {
  background: var(--input-bg);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}

/* Solid Flat Buttons */
.btn-group {
  display: flex;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #FFF;
  flex: 1;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: var(--invalid-color);
}

.btn-danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.25);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* Dashboard Stats Cards */
.stats-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-box {
  background: var(--input-bg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
}

.stat-num {
  font-size: 1.35rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.stat-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.box-total .stat-num { color: var(--text-main); }
.box-valid { border-color: rgba(16, 185, 129, 0.4); }
.box-valid .stat-num { color: var(--valid-color); }
.box-invalid { border-color: rgba(239, 68, 68, 0.4); }
.box-invalid .stat-num { color: var(--invalid-color); }
.box-rate { border-color: rgba(245, 158, 11, 0.4); }
.box-rate .stat-num { color: var(--rate-color); }
.box-error .stat-num { color: var(--error-color); }

/* Progress Bar */
.progress-bar-wrapper {
  margin-bottom: 16px;
}

.progress-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.25s linear;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Filter Tabs & Export Actions */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.tabs-group {
  display: flex;
  gap: 4px;
  background: var(--input-bg);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.tab {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.tab.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  font-weight: 600;
}

.actions-group {
  display: flex;
  gap: 8px;
}

.btn-action {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-copy {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--valid-color);
}

.btn-copy:hover {
  background: rgba(16, 185, 129, 0.2);
}

/* Search Box */
.search-box {
  position: relative;
  margin-bottom: 14px;
}

.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
}

.search-box input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 8px 12px 8px 36px;
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
}

.search-box input:focus {
  border-color: var(--primary);
}

/* Data Table */
.table-container {
  flex: 1;
  max-height: 480px;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  background: var(--input-bg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.data-table th {
  position: sticky;
  top: 0;
  background: #11131A;
  color: var(--text-muted);
  font-weight: 600;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 2;
}

.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Key Cell */
.key-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #E2E8F0;
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Flat Minimal Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-valid { background: rgba(16, 185, 129, 0.15); color: var(--valid-color); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-invalid { background: rgba(239, 68, 68, 0.15); color: var(--invalid-color); border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-rate { background: rgba(245, 158, 11, 0.15); color: var(--rate-color); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-error { background: rgba(139, 92, 246, 0.15); color: var(--error-color); border: 1px solid rgba(139, 92, 246, 0.3); }
.badge-checking { background: rgba(99, 102, 241, 0.15); color: var(--primary); border: 1px solid rgba(99, 102, 241, 0.3); }

/* Latency colors */
.latency-fast { color: #34D399; }
.latency-medium { color: #FBBF24; }
.latency-slow { color: #F87171; }

.empty-state td {
  text-align: center;
  padding: 40px 10px;
}

.empty-content {
  color: var(--text-dim);
}

/* Toast Message */
.toast-message {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--panel-bg);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  z-index: 100;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}

.toast-message.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.app-footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-dim);
  padding: 12px 0;
}