/**
 * KnowAir Dashboard - Unified Design System
 * Industrial Precision Aesthetic for IoT Environmental Monitoring
 *
 * Design Direction:
 * - Warm Terracotta accent on neutral stone tones
 * - Dark sidebar / Light content area
 * - Data-centric, scientific instrument feel
 * - Fraunces (display) + DM Sans (body) + JetBrains Mono (data values)
 */

/* ═══════════════════════════════════════════════════════════
   Design Tokens
   ═══════════════════════════════════════════════════════════ */

:root {
  /* ── Typography ── */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;

  /* ── Core Palette ── */
  --ink: #0f0f0f;
  --ink-secondary: #3d3d3d;
  --ink-muted: #6b6b6b;
  --ink-faint: #a1a1a1;
  --ink-subtle: #d4d4d4;

  --surface: #f7f6f4;
  --surface-raised: #ffffff;
  --surface-sunken: #efeeeb;
  --surface-inset: #e5e4e1;

  /* ── Sidebar (Dark) ── */
  --sidebar-bg: #0f0f0f;
  --sidebar-surface: #1a1a1a;
  --sidebar-border: #262626;
  --sidebar-text: #e5e5e5;
  --sidebar-text-muted: #8a8a8a;
  --sidebar-text-faint: #525252;

  /* ── Accent: Warm Terracotta ── */
  --accent: #c2410c;
  --accent-hover: #ea580c;
  --accent-soft: #fed7aa;
  --accent-muted: rgba(194, 65, 12, 0.12);
  --accent-subtle: rgba(194, 65, 12, 0.06);

  /* ── Semantic Colors ── */
  --positive: #16a34a;
  --positive-soft: #dcfce7;
  --positive-muted: rgba(22, 163, 74, 0.1);
  --caution: #ca8a04;
  --caution-soft: #fef9c3;
  --caution-muted: rgba(202, 138, 4, 0.1);
  --negative: #dc2626;
  --negative-soft: #fee2e2;
  --negative-muted: rgba(220, 38, 38, 0.1);

  /* ── Status Colors (Data State) ── */
  --status-good: #22c55e;
  --status-moderate: #f59e0b;
  --status-poor: #ef4444;
  --status-stale: #a3a3a3;

  /* ── Borders ── */
  --border-light: rgba(0, 0, 0, 0.06);
  --border-default: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.16);

  /* ── Spacing Scale (4px base) ── */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* ── Layout ── */
  --sidebar-width: 280px;
  --topbar-height: 56px;

  /* ── Radii ── */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* ── Shadows ── */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-card-hover:
    0 4px 16px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.04);
  --shadow-focus: 0 0 0 3px var(--accent-soft);
  --shadow-focus-inset: inset 0 0 0 1px var(--accent);

  /* ── Transitions ── */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* ═══════════════════════════════════════════════════════════
   Reset & Base
   ═══════════════════════════════════════════════════════════ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink);
  background: var(--surface);
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: var(--accent-soft);
  color: var(--ink);
}

/* ═══════════════════════════════════════════════════════════
   Typography
   ═══════════════════════════════════════════════════════════ */

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* ═══════════════════════════════════════════════════════════
   Logo Mark
   ═══════════════════════════════════════════════════════════ */

.logo-mark {
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 6px;
  position: relative;
  flex-shrink: 0;
}

.logo-mark::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  width: 12px;
  height: 12px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 3px;
}

/* ═══════════════════════════════════════════════════════════
   Auth Screens (Login / Site Selector)
   ═══════════════════════════════════════════════════════════ */

.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  padding: var(--space-6);
  position: relative;
}

/* Subtle grid texture background */
.auth-screen::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
    circle at 1px 1px,
    var(--border-light) 1px,
    transparent 0
  );
  background-size: 32px 32px;
  opacity: 0.6;
  pointer-events: none;
}

.auth-container {
  width: 100%;
  max-width: 400px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.auth-card {
  background: var(--surface-raised);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
}

.auth-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.auth-logo .logo-mark {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.auth-logo .logo-mark::after {
  top: 12px;
  left: 12px;
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

.auth-logo h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--ink);
}

.auth-subtitle {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-8);
}

.btn-google {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.btn-google:hover {
  background: var(--surface-sunken);
  border-color: var(--border-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-google:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.auth-error {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--negative-soft);
  color: var(--negative);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.auth-footer {
  margin-top: var(--space-6);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

/* Site Selector */
.site-selector {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.site-btn {
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-secondary);
  background: var(--surface-sunken);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.site-btn:hover {
  color: var(--accent);
  background: var(--accent-subtle);
  border-color: var(--accent-muted);
}

/* ═══════════════════════════════════════════════════════════
   App Layout (Sidebar + Main)
   ═══════════════════════════════════════════════════════════ */

.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ═══════════════════════════════════════════════════════════
   Sidebar
   ═══════════════════════════════════════════════════════════ */

.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
  transition: transform var(--duration-normal) var(--ease-out);
}

.sidebar-header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--sidebar-border);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--sidebar-text);
}

/* Connection Badge */
.connection-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--sidebar-surface);
  border-radius: 100px;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--sidebar-text-muted);
  letter-spacing: 0.02em;
}

.connection-badge .status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sidebar-text-faint);
  transition: background var(--duration-normal) var(--ease-out);
}

.connection-badge.online .status-dot {
  background: var(--status-good);
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}

.connection-badge.offline .status-dot {
  background: var(--negative);
}

.connection-badge.reconnecting .status-dot {
  background: var(--caution);
  animation: pulse 1.5s var(--ease-in-out) infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* Sidebar Content */
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) 0;
}

.sidebar-section {
  padding: 0 var(--space-5);
  margin-bottom: var(--space-5);
}

.section-label {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--sidebar-text-faint);
  margin-bottom: var(--space-3);
}

/* ── Site Dropdown ── */
.site-dropdown-container {
  position: relative;
}

.site-dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--sidebar-text);
  background: var(--sidebar-surface);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.site-dropdown-trigger:hover {
  background: var(--sidebar-border);
  border-color: var(--sidebar-text-faint);
}

.site-dropdown-trigger.single-site {
  cursor: default;
  pointer-events: none;
}

.site-dropdown-trigger.single-site:hover {
  background: var(--sidebar-surface);
  border-color: var(--sidebar-border);
}

.site-dropdown-trigger .dropdown-arrow {
  width: 12px;
  height: 12px;
  color: var(--sidebar-text-muted);
  flex-shrink: 0;
}

.site-dropdown-trigger.single-site .dropdown-arrow {
  display: none;
}

.site-dropdown-trigger span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: var(--space-2);
  background: var(--surface-raised);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-default);
  z-index: 200;
  overflow: hidden;
  animation: dropdownIn var(--duration-normal) var(--ease-out);
}

@keyframes dropdownIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.site-dropdown-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border-bottom: 1px solid var(--border-light);
  background: var(--surface-sunken);
}

.site-dropdown-search svg {
  flex-shrink: 0;
  color: var(--ink-faint);
}

.site-dropdown-search input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--ink);
  outline: none;
}

.site-dropdown-search input::placeholder {
  color: var(--ink-faint);
}

.site-dropdown-list {
  max-height: 240px;
  overflow-y: auto;
}

.site-dropdown-section {
  padding: var(--space-2) 0;
}

.site-dropdown-label {
  padding: var(--space-2) var(--space-3);
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  text-align: left;
}

.site-dropdown-item:hover {
  background: var(--surface-sunken);
  color: var(--ink);
}

.site-dropdown-item.active {
  background: var(--accent-subtle);
  color: var(--accent);
}

.site-dropdown-item .check-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.site-dropdown-empty {
  padding: var(--space-5) var(--space-3);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

/* ── Node List ── */
.node-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.node-list section {
  background: var(--sidebar-surface);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.node-list h4 {
  font-family: var(--font-body);
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sidebar-text-faint);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.node-list h4::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.node-list-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.node-list label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--sidebar-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--sidebar-text-muted);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.node-list label:hover {
  background: var(--sidebar-text-faint);
  color: var(--sidebar-text);
}

.node-list label.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.node-list input[type="checkbox"] {
  width: 12px;
  height: 12px;
  accent-color: var(--accent);
}

.node-list input[type="checkbox"]:checked + span {
  color: var(--accent-soft);
}

.node-limit-warning {
  margin-top: var(--space-2);
  padding: var(--space-2);
  background: var(--caution-muted);
  color: var(--caution);
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: 500;
}

.loading-inline {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  color: var(--sidebar-text-faint);
  font-size: 0.75rem;
}

.spinner-small {
  width: 14px;
  height: 14px;
  border: 2px solid var(--sidebar-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── Display Options ── */
.option-group {
  margin-bottom: var(--space-3);
}

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

.option-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--sidebar-text-faint);
  margin-bottom: var(--space-1);
}

.option-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--sidebar-text);
  background: var(--sidebar-surface);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8a8a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-2) center;
  padding-right: var(--space-6);
}

.option-select:hover {
  border-color: var(--sidebar-text-faint);
}

.option-select:focus,
.option-select:focus-visible {
  outline: none;
  border-color: var(--sidebar-border);
  box-shadow: none;
}

.option-select option {
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
}

/* ── Sidebar Footer ── */
.sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--sidebar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--sidebar-surface);
  color: var(--sidebar-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.75rem;
  flex-shrink: 0;
  border: 1px solid var(--sidebar-border);
}

.user-email {
  font-size: 0.75rem;
  color: var(--sidebar-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-actions {
  display: flex;
  gap: var(--space-1);
}

/* ── Icon Buttons ── */
.icon-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  color: var(--sidebar-text-faint);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.icon-btn:hover {
  background: var(--sidebar-surface);
  color: var(--sidebar-text);
}

/* Icon Button Tooltip */
.icon-btn::after {
  content: attr(title);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-2);
  background: var(--ink);
  color: var(--surface-raised);
  font-size: 0.6875rem;
  font-weight: 500;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-fast) var(--ease-out),
    visibility var(--duration-fast) var(--ease-out);
  pointer-events: none;
  z-index: 1000;
}

.icon-btn::before {
  content: "";
  position: absolute;
  bottom: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-fast) var(--ease-out),
    visibility var(--duration-fast) var(--ease-out);
  pointer-events: none;
  z-index: 1000;
}

.icon-btn:hover::after,
.icon-btn:hover::before {
  opacity: 1;
  visibility: visible;
}

/* ═══════════════════════════════════════════════════════════
   Main Content
   ═══════════════════════════════════════════════════════════ */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Bar (Mobile only) */
.topbar {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 50;
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  color: var(--ink);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out);
}

.menu-toggle:hover {
  background: var(--surface-sunken);
}

.topbar-logo {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.topbar-logo .logo-mark {
  width: 20px;
  height: 20px;
  border-radius: 5px;
}

.topbar-logo .logo-mark::after {
  top: 5px;
  left: 5px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.connection-badge.mobile {
  padding: var(--space-1);
}

.connection-badge.mobile .status-text {
  display: none;
}

/* Dashboard */
.dashboard {
  flex: 1;
  padding: var(--space-8);
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* Section Header */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink);
}

.freshness-wrapper {
  display: flex;
  align-items: center;
}

.freshness-indicator {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: 100px;
  letter-spacing: 0.02em;
}

.freshness-indicator:empty {
  display: none;
}

.freshness-indicator.stale {
  color: var(--caution);
  background: var(--caution-soft);
}

.freshness-indicator.offline {
  color: var(--negative);
  background: var(--negative-soft);
}

/* ═══════════════════════════════════════════════════════════
   Sensor Cards Grid
   ═══════════════════════════════════════════════════════════ */

.sensor-section {
  margin-bottom: var(--space-8);
  animation: fadeInUp var(--duration-slow) var(--ease-out) backwards;
}

.sensor-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
}

/* ── Sensor Card ── */
.sensor-card {
  background: var(--surface-raised);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  border: 1px solid var(--border-light);
  transition:
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.sensor-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--ink-subtle);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.sensor-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
  border-color: var(--border-default);
}

.sensor-card:hover::before {
  opacity: 1;
}

/* Status-based top bar colors */
.sensor-card:has(.sensor-card__status--good)::before {
  background: var(--status-good);
}

.sensor-card:has(.sensor-card__status--moderate)::before {
  background: var(--status-moderate);
}

.sensor-card:has(.sensor-card__status--poor)::before {
  background: var(--status-poor);
}

.sensor-card:has(.sensor-card__status--stale)::before {
  background: var(--caution);
}

.sensor-card:has(.sensor-card__status--offline)::before {
  background: var(--status-poor);
}

/* Actively show the top bar on non-idle cards */
.sensor-card:has(.sensor-card__status--good)::before,
.sensor-card:has(.sensor-card__status--moderate)::before,
.sensor-card:has(.sensor-card__status--poor)::before {
  opacity: 1;
}

/* Empty card */
.sensor-card--empty {
  grid-column: 1 / -1;
  padding: var(--space-10);
  background: var(--surface-sunken);
  border: 1px dashed var(--border-default);
}

.sensor-card--empty::before {
  display: none;
}

.sensor-card--empty:hover {
  transform: none;
  box-shadow: none;
}

.empty-state-inline {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.875rem;
}

/* Card Header */
.sensor-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.sensor-card__icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--surface-sunken);
  color: var(--ink-muted);
}

.sensor-card__node-id {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--ink-secondary);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.sensor-card__status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-subtle);
  flex-shrink: 0;
}

.sensor-card__status--good {
  background: var(--status-good);
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.4);
}

.sensor-card__status--moderate {
  background: var(--status-moderate);
  box-shadow: 0 0 6px rgba(245, 158, 11, 0.4);
}

.sensor-card__status--poor {
  background: var(--status-poor);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.4);
}

.sensor-card__status--stale {
  background: var(--status-stale);
}

.sensor-card__status--offline {
  background: var(--status-poor);
  opacity: 0.6;
}

.sensor-card__status--no-data {
  background: var(--ink-subtle);
}

/* Card state opacity */
.sensor-card--stale {
  opacity: 0.65;
}

.sensor-card--offline {
  opacity: 0.45;
}

.sensor-card--no-data {
  opacity: 0.4;
}

/* Card Label */
.sensor-card__label {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-bottom: var(--space-2);
}

/* Card Value */
.sensor-card__value {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  letter-spacing: -0.02em;
}

.sensor-card__unit {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-muted);
  font-family: var(--font-body);
}

.sensor-card__no-data {
  color: var(--ink-faint);
}

/* Card Time */
.sensor-card__time {
  font-size: 0.6875rem;
  color: var(--ink-faint);
  margin-top: var(--space-2);
  font-family: var(--font-body);
}

/* Card Node Footer */
.sensor-card__node {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-light);
  font-size: 0.6875rem;
  color: var(--ink-faint);
}

/* ═══════════════════════════════════════════════════════════
   Chart Section
   ═══════════════════════════════════════════════════════════ */

.chart-section {
  background: var(--surface-raised);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--border-light);
  animation: fadeInUp var(--duration-slow) var(--ease-out) 100ms backwards;
}

.checkbox-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.checkbox-toggle input[type="checkbox"] {
  width: 14px;
  height: 14px;
  accent-color: var(--accent);
}

.toggle-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.checkbox-toggle:hover .toggle-label {
  color: var(--ink);
}

.checkbox-toggle input:checked + .toggle-label {
  color: var(--accent);
}

.chart-warning {
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
  background: var(--caution-soft);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--caution);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--caution-muted);
}

.chart-warning::before {
  content: "\26A0";
  font-size: 1rem;
  flex-shrink: 0;
}

.chart-container {
  position: relative;
  width: 100%;
  height: 400px;
}

#myChart {
  width: 100% !important;
  height: 100% !important;
}

.chart-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 400px;
  text-align: center;
  background: var(--surface-sunken);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-default);
}

.empty-icon {
  color: var(--ink-subtle);
  margin-bottom: var(--space-4);
}

.empty-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink-secondary);
  margin-bottom: var(--space-2);
}

.empty-message {
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

/* ═══════════════════════════════════════════════════════════
   Buttons
   ═══════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.btn-primary {
  background: var(--ink);
  color: var(--surface-raised);
}

.btn-primary:hover {
  background: var(--ink-secondary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--surface-raised);
  color: var(--ink-secondary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background: var(--surface-sunken);
  border-color: var(--border-strong);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ═══════════════════════════════════════════════════════════
   Modal
   ═══════════════════════════════════════════════════════════ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--surface-raised);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  width: 100%;
  max-width: 440px;
  transform: scale(0.96) translateY(8px);
  transition: transform var(--duration-normal) var(--ease-out);
}

.modal-overlay.show .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--ink);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  color: var(--ink-faint);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.modal-close:hover {
  background: var(--surface-sunken);
  color: var(--ink);
}

.modal-body {
  padding: var(--space-6);
}

.modal-description {
  font-size: 0.875rem;
  color: var(--ink-muted);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

.export-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

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

.form-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition:
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.form-input:hover {
  border-color: var(--border-strong);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin-top: var(--space-3);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border-light);
  background: var(--surface-sunken);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* ═══════════════════════════════════════════════════════════
   Toast Notifications
   ═══════════════════════════════════════════════════════════ */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--surface-raised);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 320px;
  max-width: 420px;
  pointer-events: auto;
  transform: translateX(120%);
  opacity: 0;
  transition: all var(--duration-slow) var(--ease-out);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--ink-faint);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast.hiding {
  transform: translateX(120%);
  opacity: 0;
}

.toast-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 1px;
}

.toast-content {
  flex: 1;
  min-width: 0;
}

.toast-title {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--ink);
  margin-bottom: 2px;
}

.toast-message {
  font-size: 0.8125rem;
  color: var(--ink-muted);
  line-height: 1.5;
}

.toast-close {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--ink-faint);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.toast-close:hover {
  background: var(--surface-sunken);
  color: var(--ink);
}

/* Toast Type Colors */
.toast.toast-success {
  border-left-color: var(--positive);
}

.toast.toast-success .toast-icon {
  color: var(--positive);
}

.toast.toast-error {
  border-left-color: var(--negative);
}

.toast.toast-error .toast-icon {
  color: var(--negative);
}

.toast.toast-warning {
  border-left-color: var(--caution);
}

.toast.toast-warning .toast-icon {
  color: var(--caution);
}

.toast.toast-info {
  border-left-color: var(--accent);
}

.toast.toast-info .toast-icon {
  color: var(--accent);
}

/* Toast Actions */
.toast-actions {
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
}

.toast-action-btn {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.toast-action-btn.primary {
  background: var(--ink);
  color: var(--surface-raised);
  border: none;
}

.toast-action-btn.primary:hover {
  background: var(--ink-secondary);
}

.toast-action-btn.secondary {
  background: transparent;
  color: var(--ink-muted);
  border: 1px solid var(--border-default);
}

.toast-action-btn.secondary:hover {
  background: var(--surface-sunken);
  color: var(--ink);
}

/* Toast Progress Bar */
.toast-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: currentColor;
  opacity: 0.15;
  animation: toastProgress linear forwards;
}

@keyframes toastProgress {
  from {
    width: 100%;
  }
  to {
    width: 0%;
  }
}

/* ═══════════════════════════════════════════════════════════
   Sidebar Overlay (Mobile)
   ═══════════════════════════════════════════════════════════ */

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out);
}

.sidebar-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* ═══════════════════════════════════════════════════════════
   Utility Classes
   ═══════════════════════════════════════════════════════════ */

.hidden {
  display: none !important;
}

/* ═══════════════════════════════════════════════════════════
   Responsive Design
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .topbar {
    display: flex;
  }

  .dashboard {
    padding: var(--space-5);
  }

  .sensor-cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-3);
  }

  .chart-container,
  .chart-empty-state {
    height: 320px;
  }
}

@media (max-width: 640px) {
  .dashboard {
    padding: var(--space-4);
  }

  .sensor-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sensor-card {
    padding: var(--space-4);
  }

  .sensor-card__value {
    font-size: 1.5rem;
  }

  .chart-section {
    padding: var(--space-4);
  }

  .chart-container,
  .chart-empty-state {
    height: 280px;
  }

  /* Toast: top position on mobile */
  .toast-container {
    top: var(--space-4);
    bottom: auto;
    left: var(--space-4);
    right: var(--space-4);
  }

  .toast {
    min-width: unset;
    max-width: unset;
    width: 100%;
    transform: translateY(-120%);
  }

  .toast.show {
    transform: translateY(0);
  }

  .toast.hiding {
    transform: translateY(-120%);
  }

  .export-form {
    grid-template-columns: 1fr;
  }

  .auth-card {
    padding: var(--space-8) var(--space-6);
  }
}

/* ═══════════════════════════════════════════════════════════
   Animations
   ═══════════════════════════════════════════════════════════ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ═══════════════════════════════════════════════════════════
   Focus States
   ═══════════════════════════════════════════════════════════ */

*:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* ═══════════════════════════════════════════════════════════
   Custom Scrollbar
   ═══════════════════════════════════════════════════════════ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--ink-subtle);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ink-faint);
}

/* Sidebar scrollbar */
.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: var(--sidebar-border);
  border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: var(--sidebar-text-faint);
}