/* Modern Developer Web Portal Design System - Dual Theme (Light & Dark) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color Palette - Core Definitions */
  --navy: #0A1931;
  --deep-blue: #1A3D63;
  --steel-blue: #4A7FA7;
  --powder-blue: #B3CFE5;
  --ice-white: #F6FAFD;
  
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  
  --glass-backdrop: blur(16px);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 🌚 Dark Mode Theme (Default) */
:root, [data-theme="dark"] {
  --bg-primary: #0A1931;
  --bg-secondary: #122A4A;
  --bg-card: #122A4A;
  --bg-card-hover: #18355b;
  --bg-input: #0A1931;
  --nav-bg: rgba(10, 25, 49, 0.92);
  --nav-tabs-bg: rgba(18, 42, 74, 0.85);
  
  --border-color: #1A3D63;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #4A7FA7;
  
  --text-main: #F6FAFD;
  --text-muted: #B3CFE5;
  --text-dim: rgba(179, 207, 229, 0.65);
  
  --btn-primary-bg: #4A7FA7;
  --btn-primary-hover: #B3CFE5;
  --btn-primary-text: #0A1931;
  
  --btn-secondary-bg: #1A3D63;
  --btn-secondary-hover: #234e7c;
  --btn-secondary-text: #F6FAFD;
  
  --accent: #4A7FA7;
  --accent-hover: #B3CFE5;
  --icon-muted: rgba(74, 127, 167, 0.6);
  
  --modal-bg: #0F213A;
  --code-bg: #071224;
  --code-text: #B3CFE5;
  
  --shadow-glow: 0 0 25px rgba(74, 127, 167, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(10, 25, 49, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --hero-bg: linear-gradient(135deg, rgba(74, 127, 167, 0.18) 0%, rgba(26, 61, 99, 0.3) 100%);
  --step-bg: rgba(10, 25, 49, 0.6);
  --ambient-glow: radial-gradient(circle, rgba(74, 127, 167, 0.14) 0%, rgba(0, 0, 0, 0) 70%);
}

/* 🌞 Light Mode Theme */
[data-theme="light"] {
  --bg-primary: #F6FAFD;
  --bg-secondary: #EAF2FA;
  --bg-card: #EAF2FA;
  --bg-card-hover: #dfebf7;
  --bg-input: #ffffff;
  --nav-bg: rgba(246, 250, 253, 0.92);
  --nav-tabs-bg: rgba(234, 242, 250, 0.85);
  
  --border-color: #B3CFE5;
  --border-subtle: rgba(10, 25, 49, 0.08);
  --border-focus: #1A3D63;
  
  --text-main: #0A1931;
  --text-muted: #1A3D63;
  --text-dim: #4A7FA7;
  
  --btn-primary-bg: #1A3D63;
  --btn-primary-hover: #4A7FA7;
  --btn-primary-text: #F6FAFD;
  
  --btn-secondary-bg: #B3CFE5;
  --btn-secondary-hover: #9cbdd7;
  --btn-secondary-text: #0A1931;
  
  --accent: #1A3D63;
  --accent-hover: #4A7FA7;
  --icon-muted: #4A7FA7;
  
  --modal-bg: #ffffff;
  --code-bg: #0A1931;
  --code-text: #F6FAFD;
  
  --shadow-glow: 0 0 25px rgba(26, 61, 99, 0.15);
  --shadow-card: 0 10px 30px -10px rgba(74, 127, 167, 0.15), 0 0 0 1px rgba(10, 25, 49, 0.04);
  --hero-bg: linear-gradient(135deg, rgba(234, 242, 250, 0.9) 0%, rgba(179, 207, 229, 0.35) 100%);
  --step-bg: rgba(255, 255, 255, 0.8);
  --ambient-glow: radial-gradient(circle, rgba(74, 127, 167, 0.09) 0%, rgba(0, 0, 0, 0) 70%);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: -200px;
  left: 25%;
  width: 650px;
  height: 650px;
  background: var(--ambient-glow);
  pointer-events: none;
  z-index: -1;
}

h1, h2, h3, .brand-title, .card-title {
  letter-spacing: -0.025em;
}

/* Header & Top Navigation */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--nav-bg);
  backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--btn-primary-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--btn-primary-text);
  font-size: 1.2rem;
  box-shadow: var(--shadow-glow);
  transition: var(--transition);
}

.brand-logo-img {
  width: 24px;
  height: 24px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  transition: var(--transition);
}

.brand-title {
  color: var(--text-main);
  font-weight: 800;
}

.badge-tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(74, 127, 167, 0.15);
  color: var(--accent);
  border: 1px solid var(--border-color);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.profile-menu-container {
  position: relative;
  display: inline-block;
}

.profile-icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.4rem;
  transition: var(--transition);
}

.profile-icon-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-hover);
  color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.profile-dropdown-window {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  width: 250px;
  background: var(--modal-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  padding: 1rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
}

.profile-dropdown-window.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.profile-window-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.profile-avatar-large {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--btn-secondary-bg);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.profile-details {
  overflow: hidden;
  min-width: 0;
}

.profile-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.profile-email {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.profile-window-divider {
  height: 1px;
  background: var(--border-color);
  margin: 0.75rem 0;
}

.profile-logout-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
}

.profile-logout-btn:hover {
  background: var(--danger);
  color: #ffffff;
}

.profile-delete-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px dashed rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.profile-delete-btn:hover {
  background: var(--danger);
  color: #ffffff;
  border-style: solid;
}

.tenant-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-main);
}

.tenant-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
}

/* Navigation Tabs */
.nav-tabs-container {
  background: var(--nav-tabs-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  overflow-x: auto;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  flex: 1;
  text-align: center;
}

.tab-btn:first-child {
  justify-content: flex-start;
}

.tab-btn:last-child {
  justify-content: flex-end;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(74, 127, 167, 0.08);
}

.tab-btn.active {
  color: var(--text-main);
  border-bottom-color: var(--accent);
  background: rgba(74, 127, 167, 0.15);
  font-weight: 600;
}

/* Main Container */
.container {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
}

/* Views & Cards */
.view-panel {
  display: none;
  animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  border-color: var(--border-color);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-main);
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  text-decoration: none;
  user-select: none;
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: 0 4px 14px rgba(26, 61, 99, 0.25);
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  color: var(--btn-primary-text);
  transform: translateY(-1.5px);
  box-shadow: 0 6px 18px rgba(26, 61, 99, 0.35);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  border-color: var(--border-subtle);
  color: var(--btn-secondary-text);
}

.btn-secondary:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--border-color);
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.3);
  color: #fff;
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* Grid & Stats */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease, background-color 0.3s ease;
}

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

/* Pure CSS Skeleton Shimmer Utilities */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
  display: inline-block;
}

@media (prefers-reduced-motion: reduce) {
  .skeleton {
    animation: none;
  }
}

.stat-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-icon.primary { background: rgba(74, 127, 167, 0.15); color: var(--accent); }
.stat-icon.success { background: var(--success-bg); color: var(--success); }
.stat-icon.warning { background: var(--warning-bg); color: var(--warning); }
.stat-icon.cyan { background: rgba(179, 207, 229, 0.2); color: var(--accent); }

.stat-val {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-main);
}

.stat-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Zero-Touch Ingestion Setup Box */
.ingestion-hero {
  background: var(--hero-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.url-box {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.5rem 0.5rem 1rem;
  margin: 1rem 0;
  gap: 0.75rem;
  transition: var(--transition);
}

.url-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
}

/* Setup Guide Accordion & 3-Step Symmetrical / Inverted Triangle Layout */
.setup-guide {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
}

.setup-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 1rem;
}

/* Medium screen breakpoint: 2 top cards, 1 centered bottom card (Inverted Triangle) */
@media (max-width: 991px) and (min-width: 600px) {
  .setup-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .setup-steps .step-item:last-child {
    grid-column: 1 / -1;
    justify-self: center;
    width: calc(50% - 0.625rem);
  }
}

/* Small screen breakpoint: 1 column vertical stack (Symmetrical 1x3) */
@media (max-width: 599px) {
  .setup-steps {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .setup-steps .step-item {
    width: 100%;
  }
}

.step-item {
  background: var(--step-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition);
}

.step-item:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.step-num {
  width: 28px;
  height: 28px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.step-title {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.step-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

th {
  background: var(--bg-secondary);
  padding: 0.85rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
}

tr:hover td {
  background: rgba(74, 127, 167, 0.05);
}

/* Badges & Status */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.status-badge.online {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-badge.offline {
  background: rgba(156, 163, 175, 0.15);
  color: var(--text-muted);
  border: 1px solid rgba(156, 163, 175, 0.3);
}

.status-dot-pulse {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.type-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(74, 127, 167, 0.15);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Stream / Telemetry Feed */
.stream-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
}

.socket-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
}

.stream-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 600px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.stream-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideIn 0.3s ease-out;
}

.stream-item.CHECK_IN { border-left-color: var(--success); }
.stream-item.CHECK_OUT { border-left-color: var(--steel-blue); }
.stream-item.DOOR_OPEN { border-left-color: var(--warning); }
.stream-item.DOOR_FORCED { border-left-color: var(--danger); }
.stream-item.HEARTBEAT {
  border-left-color: #06b6d4; /* Vibrant Cyan border */
}
.stream-item.HEARTBEAT .stream-icon {
  background: rgba(6, 182, 212, 0.12);
  color: #06b6d4;
}

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

.stream-main {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stream-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: rgba(74, 127, 167, 0.12);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.stream-details h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.stream-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Modals */
.modal-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(10, 25, 49, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  overflow-y: auto;
}

.modal-backdrop.active {
  display: flex;
  animation: fadeIn 0.2s ease-out;
}

.modal {
  background: var(--modal-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  max-height: min(88vh, calc(100vh - 3rem));
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  position: relative;
  color: var(--text-main);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-shrink: 0;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-main);
}

/* Form inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.9rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(74, 127, 167, 0.2);
}

.form-control.is-invalid {
  border-color: var(--danger) !important;
  background-color: rgba(239, 68, 68, 0.04) !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2) !important;
}

.form-control.is-valid {
  border-color: var(--success) !important;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15) !important;
}

/* Field Error & Helper Hint Text */
.field-error {
  display: none;
  font-size: 0.8rem;
  color: var(--danger);
  margin-top: 0.35rem;
  font-weight: 500;
  align-items: center;
  gap: 0.35rem;
  animation: fadeIn 0.2s ease-in-out;
}

.field-error.show {
  display: flex;
}

.field-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  line-height: 1.35;
}

/* Password Input Wrapper & Toggle Eye Button */
.input-password-wrapper {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
}

.input-password-wrapper .form-control {
  padding-right: 2.75rem;
}

.password-toggle-btn {
  position: absolute;
  right: 0.75rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  z-index: 2;
}

.password-toggle-btn:hover {
  color: var(--text-main);
  background: rgba(74, 127, 167, 0.15);
}

/* Password Strength Indicator */
.password-strength-container {
  margin-top: 0.5rem;
  display: none;
}

.password-strength-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  margin-bottom: 0.3rem;
  color: var(--text-muted);
}

.password-strength-label {
  font-weight: 600;
}

.password-strength-bar {
  height: 4px;
  width: 100%;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.password-strength-fill {
  height: 100%;
  width: 0%;
  border-radius: var(--radius-full);
  transition: width 0.3s ease, background-color 0.3s ease;
}

.password-strength-fill.weak { width: 33%; background: var(--danger); }
.password-strength-fill.medium { width: 66%; background: var(--warning); }
.password-strength-fill.strong { width: 100%; background: var(--success); }

.password-requirements {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.req-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.req-item.valid {
  color: var(--success);
}

.req-item.invalid {
  color: var(--text-muted);
}

/* Password Match Indicator */
.match-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.match-badge.matched {
  background: var(--success-bg);
  color: var(--success);
}

.match-badge.mismatched {
  background: var(--danger-bg);
  color: var(--danger);
}

/* Disabled & Loading Button States */
.btn:disabled, .btn.loading {
  opacity: 0.7;
  cursor: not-allowed;
  pointer-events: none;
}

/* Toast Notification Improvements */
.toast.info { border-left: 4px solid var(--accent); }
.toast.warning { border-left: 4px solid var(--warning); }

.toast-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  margin-left: auto;
  padding: 0.2rem;
  display: flex;
  align-items: center;
  line-height: 1;
}

.toast-close-btn:hover {
  color: var(--text-main);
}

/* Auth Card */
.auth-wrapper {
  max-width: 440px;
  margin: 4rem auto;
}

.auth-tabs {
  display: flex;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  margin-bottom: 1.5rem;
}

.auth-tab {
  flex: 1;
  text-align: center;
  padding: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.auth-tab.active {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

/* Pre / Code blocks */
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--code-text);
  overflow-x: auto;
  white-space: pre-wrap;
}

/* Toast Alerts */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--modal-bg);
  color: var(--text-main);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  animation: slideUp 0.3s ease-out;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Comprehensive Mobile & Responsive UI Optimization
   ========================================================================== */

/* Navbar Mobile Optimizations */
@media (max-width: 640px) {
  .navbar {
    padding: 0.75rem 1rem;
  }
  .brand {
    gap: 0.5rem;
    font-size: 1.05rem;
  }
  .brand-icon {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }
  #themeToggleText {
    display: none;
  }
  .tenant-pill {
    padding: 0.3rem 0.6rem;
    font-size: 0.78rem;
  }
}

/* Nav Tabs bar Mobile Optimizations */
@media (max-width: 768px) {
  .nav-tabs-container {
    padding: 0 0.75rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .nav-tabs-container::-webkit-scrollbar {
    display: none;
  }
  .tab-btn {
    padding: 0.75rem 0.85rem;
    font-size: 0.82rem;
  }
}

/* Global Container & Card Mobile Adjustments */
@media (max-width: 768px) {
  .container {
    padding: 1.25rem 0.85rem;
  }
  .card {
    padding: 1.1rem;
    margin-bottom: 1.1rem;
    border-radius: var(--radius-md);
  }
}

/* Auth Card Mobile */
@media (max-width: 480px) {
  .auth-wrapper {
    margin: 1.5rem auto;
    width: 100%;
  }
  .auth-wrapper .card {
    padding: 1.25rem 1rem;
  }
  .auth-tab {
    font-size: 0.85rem;
    padding: 0.5rem;
  }
}

/* Ingestion URL Box Mobile */
@media (max-width: 640px) {
  .ingestion-hero {
    padding: 1.25rem;
  }
  .url-box {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
    gap: 0.6rem;
  }
  .url-input {
    width: 100%;
    text-align: center;
    font-size: 0.82rem;
  }
  .url-box .btn {
    width: 100%;
  }
}

/* Card Header Controls Wrapping */
@media (max-width: 640px) {
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .card-header > div {
    width: 100%;
  }
  .card-header-actions,
  .card-header > div[style*="display: flex"] {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .card-header .btn {
    flex: 1;
    min-width: 120px;
    justify-content: center;
  }
  .card-header select.form-control {
    width: 100% !important;
  }
}

/* Telemetry Stream Bar & Items Mobile */
@media (max-width: 640px) {
  .stream-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0.85rem;
  }
  .stream-bar select, #eventTypeFilter {
    width: 100% !important;
  }
  .socket-status {
    flex-wrap: wrap;
    justify-content: space-between;
  }
}

@media (max-width: 580px) {
  .stream-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .stream-main {
    width: 100%;
  }
  .stream-item .btn {
    align-self: stretch;
    width: 100%;
  }
}

/* Table Mobile Optimizations */
@media (max-width: 768px) {
  table {
    font-size: 0.82rem;
  }
  th, td {
    padding: 0.65rem 0.75rem;
  }
  .table-responsive {
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-sm);
  }
}

/* Modal Mobile Optimizations */
@media (max-width: 640px) {
  .modal-backdrop {
    padding: 1rem;
  }
  .modal {
    padding: 1.25rem;
    max-height: 88vh;
    overflow-y: auto;
    border-radius: var(--radius-md);
    margin: 0.5rem;
  }
  .modal form > div[style*="justify-content: flex-end"] {
    flex-direction: column-reverse;
    gap: 0.5rem;
  }
  .modal form > div[style*="justify-content: flex-end"] .btn {
    width: 100%;
  }
}

/* Webhook Checkboxes Grid Mobile */
@media (max-width: 480px) {
  div[style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
}

/* Toast Container Mobile */
@media (max-width: 540px) {
  .toast-container {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
  .toast {
    width: 100%;
  }
}

/* Form input height & accessibility touch sizes */
@media (max-width: 768px) {
  .form-control, .btn {
    min-height: 42px;
  }
}