/* ==========================================================================
   FEEDRATE WORKS FOLLOW-UP MANAGER - CORE DESIGN SYSTEM
   Dark Theme / Glassmorphism / Modern High-Performance Layout
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-darkest: #07090e;
  --bg-darker: #0c1017;
  --bg-dark: #121824;
  --bg-surface: #182232;
  --bg-surface-elevated: #1e2b3e;
  --bg-glass: rgba(18, 24, 36, 0.72);
  --bg-glass-card: rgba(24, 34, 50, 0.65);
  --bg-glass-input: rgba(12, 16, 23, 0.6);

  /* Border Tokens */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-prominent: rgba(255, 255, 255, 0.2);
  --border-focus: rgba(99, 102, 241, 0.6);

  /* Brand & Accent Hues */
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.28);
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;

  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);
  
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.25);
  --success-bg: rgba(16, 185, 129, 0.12);

  --warning: #f59e0b;
  --warning-glow: rgba(245, 158, 11, 0.25);
  --warning-bg: rgba(245, 158, 11, 0.12);

  --danger: #f43f5e;
  --danger-glow: rgba(244, 63, 94, 0.25);
  --danger-bg: rgba(244, 63, 94, 0.12);

  --purple: #8b5cf6;
  --purple-bg: rgba(139, 92, 246, 0.12);

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', var(--font-main);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-faint: #475569;

  /* Elevation & Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 24px var(--primary-glow);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-darkest);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.06) 0%, transparent 50%),
    linear-gradient(to bottom, #07090e, #0c1017);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darkest);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Utilities */
.hidden {
  display: none !important;
}

.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
}

.glass-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

/* Main Layout Structure */
.app-root {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header Styles */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(12, 16, 23, 0.85);
  backdrop-filter: blur(16px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.app-branding {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-glow {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  color: white;
  box-shadow: 0 0 16px var(--primary-glow);
}

.logo-symbol {
  width: 20px;
  height: 20px;
}

.app-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #fff;
}

.app-tagline {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: -2px;
}

.system-date-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.system-date-badge:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary-light);
}

.system-date-badge svg {
  width: 14px;
  height: 14px;
  color: var(--accent-cyan);
}

.date-label {
  font-size: 11px;
  color: var(--text-dim);
}

.date-value {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-main);
}

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

.global-metric-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
}

.global-metric-pill.warning {
  background: var(--warning-bg);
  border-color: rgba(245, 158, 11, 0.3);
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
}

.metric-val {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--warning);
  box-shadow: 0 0 8px var(--warning-glow);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Mailbox Horizontal Scroll Tabs */
.mailbox-nav-bar {
  position: relative;
  background: var(--bg-darker);
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 24px;
}

.nav-scroll-wrapper {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE */
}
.nav-scroll-wrapper::-webkit-scrollbar {
  display: none;
}

.nav-tabs-container {
  display: flex;
  align-items: center;
  gap: 8px;
  width: max-content;
}

.nav-fade-right {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 40px;
  background: linear-gradient(to right, transparent, var(--bg-darker));
  pointer-events: none;
}

.mailbox-tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.mailbox-tab:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border-color: var(--border-medium);
}

.mailbox-tab.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.16), rgba(6, 182, 212, 0.12));
  color: #fff;
  border-color: var(--primary-light);
  box-shadow: 0 0 12px var(--primary-glow);
}

.tab-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
}

.tab-status-dot.success {
  background: var(--success);
  box-shadow: 0 0 8px var(--success-glow);
}

.tab-status-dot.syncing {
  background: var(--accent-cyan);
  animation: pulse 1.2s infinite;
}

.tab-status-dot.error {
  background: var(--danger);
  box-shadow: 0 0 8px var(--danger-glow);
}

.tab-count-badge {
  padding: 2px 7px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

.mailbox-tab.active .tab-count-badge {
  background: var(--primary);
  color: #fff;
}

.tab-rec-alert {
  padding: 1px 5px;
  background: var(--warning);
  color: #000;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 700;
}

/* Main Content Area */
.main-content {
  flex: 1;
  padding: 24px;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

/* Sub-View Navigation Tabs */
.sub-nav-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 20px;
  overflow-x: auto;
  scrollbar-width: none;
}

.sub-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.sub-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
}

.sub-tab-btn.active {
  color: var(--primary-light);
  border-bottom-color: var(--primary);
}

.sub-tab-count {
  padding: 2px 7px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
}

.sub-tab-btn.active .sub-tab-count {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
}

.warning-tab.active {
  color: var(--warning);
  border-bottom-color: var(--warning);
}

.warning-tab .sub-tab-count {
  background: var(--warning-bg);
  color: var(--warning);
}