/* ==========================================================================
   BK Enterprises - Minimal Electronics & Appliance Repair
   Modern Minimalist Design System
   ========================================================================== */

/* 1. CSS Custom Properties & Color Schemes */
:root {
  /* Color Scheme declaration */
  color-scheme: light dark;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Light Theme Tokens */
  --bg-primary-light: #f8fafc;
  --bg-surface-light: #ffffff;
  --bg-surface-elevated-light: #f1f5f9;
  --bg-card-subtle-light: #f8fafc;
  --border-light: #e2e8f0;
  --border-subtle-light: #f1f5f9;
  --text-primary-light: #0f172a;
  --text-secondary-light: #475569;
  --text-tertiary-light: #64748b;
  --brand-primary-light: #1d4ed8;
  --brand-hover-light: #1e40af;
  --brand-subtle-light: #eff6ff;
  --brand-text-light: #ffffff;
  --accent-emerald-light: #059669;
  --accent-emerald-bg-light: #ecfdf5;
  --accent-amber-light: #d97706;
  --accent-amber-bg-light: #fffbeb;
  --error-light: #dc2626;
  --error-bg-light: #fef2f2;
  --shadow-sm-light: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md-light: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg-light: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);

  /* Dark Theme Tokens */
  --bg-primary-dark: #090d16;
  --bg-surface-dark: #0f172a;
  --bg-surface-elevated-dark: #1e293b;
  --bg-card-subtle-dark: #141d2e;
  --border-dark: #233148;
  --border-subtle-dark: #1a2538;
  --text-primary-dark: #f8fafc;
  --text-secondary-dark: #94a3b8;
  --text-tertiary-dark: #64748b;
  --brand-primary-dark: #3b82f6;
  --brand-hover-dark: #60a5fa;
  --brand-subtle-dark: rgba(59, 130, 246, 0.15);
  --brand-text-dark: #ffffff;
  --accent-emerald-dark: #10b981;
  --accent-emerald-bg-dark: rgba(16, 185, 129, 0.15);
  --accent-amber-dark: #f59e0b;
  --accent-amber-bg-dark: rgba(245, 158, 11, 0.15);
  --error-dark: #ef4444;
  --error-bg-dark: rgba(239, 68, 68, 0.15);
  --shadow-sm-dark: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md-dark: 0 4px 8px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg-dark: 0 12px 24px -4px rgba(0, 0, 0, 0.6);

  /* Default assignment using light-dark() with media fallback */
  --bg-primary: var(--bg-primary-light);
  --bg-surface: var(--bg-surface-light);
  --bg-surface-elevated: var(--bg-surface-elevated-light);
  --bg-card-subtle: var(--bg-card-subtle-light);
  --border-color: var(--border-light);
  --border-subtle: var(--border-subtle-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --text-tertiary: var(--text-tertiary-light);
  --brand-primary: var(--brand-primary-light);
  --brand-hover: var(--brand-hover-light);
  --brand-subtle: var(--brand-subtle-light);
  --brand-text: var(--brand-text-light);
  --accent-emerald: var(--accent-emerald-light);
  --accent-emerald-bg: var(--accent-emerald-bg-light);
  --accent-amber: var(--accent-amber-light);
  --accent-amber-bg: var(--accent-amber-bg-light);
  --color-error: var(--error-light);
  --color-error-bg: var(--error-bg-light);
  --box-shadow-sm: var(--shadow-sm-light);
  --box-shadow-md: var(--shadow-md-light);
  --box-shadow-lg: var(--shadow-lg-light);

  /* UI Spacing & Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --max-w-content: 1200px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Fallback for system dark mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: var(--bg-primary-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-surface-elevated: var(--bg-surface-elevated-dark);
    --bg-card-subtle: var(--bg-card-subtle-dark);
    --border-color: var(--border-dark);
    --border-subtle: var(--border-subtle-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-tertiary: var(--text-tertiary-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-hover: var(--brand-hover-dark);
    --brand-subtle: var(--brand-subtle-dark);
    --brand-text: var(--brand-text-dark);
    --accent-emerald: var(--accent-emerald-dark);
    --accent-emerald-bg: var(--accent-emerald-bg-dark);
    --accent-amber: var(--accent-amber-dark);
    --accent-amber-bg: var(--accent-amber-bg-dark);
    --color-error: var(--error-dark);
    --color-error-bg: var(--error-bg-dark);
    --box-shadow-sm: var(--shadow-sm-dark);
    --box-shadow-md: var(--shadow-md-dark);
    --box-shadow-lg: var(--shadow-lg-dark);
  }
}

/* Explicit data-theme overrides */
[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: var(--bg-primary-dark);
  --bg-surface: var(--bg-surface-dark);
  --bg-surface-elevated: var(--bg-surface-elevated-dark);
  --bg-card-subtle: var(--bg-card-subtle-dark);
  --border-color: var(--border-dark);
  --border-subtle: var(--border-subtle-dark);
  --text-primary: var(--text-primary-dark);
  --text-secondary: var(--text-secondary-dark);
  --text-tertiary: var(--text-tertiary-dark);
  --brand-primary: var(--brand-primary-dark);
  --brand-hover: var(--brand-hover-dark);
  --brand-subtle: var(--brand-subtle-dark);
  --brand-text: var(--brand-text-dark);
  --accent-emerald: var(--accent-emerald-dark);
  --accent-emerald-bg: var(--accent-emerald-bg-dark);
  --accent-amber: var(--accent-amber-dark);
  --accent-amber-bg: var(--accent-amber-bg-dark);
  --color-error: var(--error-dark);
  --color-error-bg: var(--error-bg-dark);
  --box-shadow-sm: var(--shadow-sm-dark);
  --box-shadow-md: var(--shadow-md-dark);
  --box-shadow-lg: var(--shadow-lg-dark);
}

[data-theme="light"] {
  color-scheme: light;
  --bg-primary: var(--bg-primary-light);
  --bg-surface: var(--bg-surface-light);
  --bg-surface-elevated: var(--bg-surface-elevated-light);
  --bg-card-subtle: var(--bg-card-subtle-light);
  --border-color: var(--border-light);
  --border-subtle: var(--border-subtle-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --text-tertiary: var(--text-tertiary-light);
  --brand-primary: var(--brand-primary-light);
  --brand-hover: var(--brand-hover-light);
  --brand-subtle: var(--brand-subtle-light);
  --brand-text: var(--brand-text-light);
  --accent-emerald: var(--accent-emerald-light);
  --accent-emerald-bg: var(--accent-emerald-bg-light);
  --accent-amber: var(--accent-amber-light);
  --accent-amber-bg: var(--accent-amber-bg-light);
  --color-error: var(--error-light);
  --color-error-bg: var(--error-bg-light);
  --box-shadow-sm: var(--shadow-sm-light);
  --box-shadow-md: var(--shadow-md-light);
  --box-shadow-lg: var(--shadow-lg-light);
}

/* Modern light-dark() CSS support */
@supports (color: light-dark(black, white)) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) {
    --bg-primary: light-dark(var(--bg-primary-light), var(--bg-primary-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-surface-elevated: light-dark(var(--bg-surface-elevated-light), var(--bg-surface-elevated-dark));
    --bg-card-subtle: light-dark(var(--bg-card-subtle-light), var(--bg-card-subtle-dark));
    --border-color: light-dark(var(--border-light), var(--border-dark));
    --border-subtle: light-dark(var(--border-subtle-light), var(--border-subtle-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-secondary: light-dark(var(--text-secondary-light), var(--text-secondary-dark));
    --text-tertiary: light-dark(var(--text-tertiary-light), var(--text-tertiary-dark));
    --brand-primary: light-dark(var(--brand-primary-light), var(--brand-primary-dark));
    --brand-hover: light-dark(var(--brand-hover-light), var(--brand-hover-dark));
    --brand-subtle: light-dark(var(--brand-subtle-light), var(--brand-subtle-dark));
    --accent-emerald: light-dark(var(--accent-emerald-light), var(--accent-emerald-dark));
    --accent-emerald-bg: light-dark(var(--accent-emerald-bg-light), var(--accent-emerald-bg-dark));
    --accent-amber: light-dark(var(--accent-amber-light), var(--accent-amber-dark));
    --accent-amber-bg: light-dark(var(--accent-amber-bg-light), var(--accent-amber-bg-dark));
    --color-error: light-dark(var(--error-light), var(--error-dark));
    --color-error-bg: light-dark(var(--error-bg-light), var(--error-bg-dark));
    --box-shadow-sm: light-dark(var(--shadow-sm-light), var(--shadow-sm-dark));
    --box-shadow-md: light-dark(var(--shadow-md-light), var(--shadow-md-dark));
    --box-shadow-lg: light-dark(var(--shadow-lg-light), var(--shadow-lg-dark));
  }
}

/* 2. Global Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  accent-color: var(--brand-primary);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: Focus outlines */
:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

.visually-hidden {
  position: absolute;
  clip-path: inset(50%);
  overflow: hidden;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  white-space: nowrap;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-w-content);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-inline: 2rem;
  }
}

/* Status Indicator */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 0 2px var(--accent-emerald-bg);
  animation: pulse-dot 2s infinite ease-in-out;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

/* 3. Main Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: color-mix(in srgb, var(--bg-surface) 92%, transparent);
  z-index: 50;
  transition: border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
  gap: 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-symbol {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background-color: var(--brand-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 800;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--box-shadow-sm);
}

.logo-meta {
  display: flex;
  flex-direction: column;
}

.logo-sub {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Nav Menu Links */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-elevated);
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-elevated);
  border-color: var(--text-tertiary);
}

.btn-header-call {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

@media (min-width: 640px) {
  .btn-header-call {
    display: inline-flex;
  }
}

.btn-header-call:hover {
  background-color: var(--brand-subtle);
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--brand-primary);
  color: var(--brand-text);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-sm);
  min-height: 44px;
  border: 1px solid transparent;
  box-shadow: var(--box-shadow-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

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

.mobile-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

@media (min-width: 900px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Mobile Popover Navigation (per modern-web-guidance) */
.mobile-nav-panel {
  display: none;
  position: fixed;
  top: 4.25rem;
  left: 0;
  right: 0;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--box-shadow-lg);
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-nav-panel.is-open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

/* 4. Minimal Hero Section */
.hero-section {
  padding: 3.5rem 0 3rem;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 80% 20%, var(--brand-subtle) 0%, transparent 40%),
              radial-gradient(circle at 10% 80%, var(--bg-surface-elevated) 0%, transparent 50%),
              var(--bg-primary);
  position: relative;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 5rem 0 4.5rem;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3.5rem;
  }
}

.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--brand-primary);
  margin-bottom: 1.25rem;
  box-shadow: var(--box-shadow-sm);
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.hero-title span.highlight {
  color: var(--brand-primary);
  position: relative;
  display: inline-block;
}

.hero-lead {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 620px;
  margin-bottom: 2rem;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-sm);
  min-height: 44px;
  box-shadow: var(--box-shadow-sm);
  transition: all var(--transition-fast);
}

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

/* Hero Key Pillars / Spec Matrix */
.hero-specs-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

@media (min-width: 640px) {
  .hero-specs-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.spec-cell {
  display: flex;
  flex-direction: column;
}

.spec-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.spec-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 0.15rem;
}

/* Hero Direct Dispatch Hotline Card */
.hero-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--box-shadow-md);
  position: relative;
}

.hero-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.hero-card-sub {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.pill-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  background-color: var(--accent-emerald-bg);
  color: var(--accent-emerald);
  border: 1px solid color-mix(in srgb, var(--accent-emerald) 30%, transparent);
}

.hero-hotline-card {
  display: flex;
  flex-direction: column;
}

.hotline-card-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hotline-phone-display {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  text-align: center;
}

.hotline-label {
  display: block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: 0.5rem;
}

.hotline-number {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 800;
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  line-height: 1.2;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.hotline-number:hover {
  color: var(--brand-hover);
  transform: scale(1.02);
}

.hotline-timing {
  display: block;
  font-size: 0.775rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.hotline-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hotline-guarantees {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.guarantee-item svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* 5. Inputs & Controls (Modern Web Guidance Compliant) */
.form-field {
  margin-bottom: 1.25rem;
  position: relative;
}

.field-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.field-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: 0.35rem;
}

/* Inputs, Selects, Textareas */
.input-control,
.select-control,
.textarea-control {
  width: 100%;
  font-family: inherit;
  font-size: max(1rem, 1em); /* Prevents iOS auto-zoom per modern web guidance */
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6875rem 0.875rem;
  min-height: 48px; /* Touch target size per guidance */
  transition: border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  box-sizing: border-box;
}

.input-control:hover,
.select-control:hover,
.textarea-control:hover {
  border-color: var(--text-tertiary);
}

.input-control:focus,
.select-control:focus,
.textarea-control:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-subtle);
  background-color: var(--bg-surface);
}

.textarea-control {
  min-height: 80px;
  resize: vertical;
}

/* Form validation pseudo-classes (:user-invalid and fallback) */
:is(:user-invalid, .user-invalid-fallback) {
  border-color: var(--color-error);
  background-color: var(--color-error-bg);
}

:is(:user-valid, .user-valid-fallback):not(:placeholder-shown) {
  border-color: var(--accent-emerald);
}

/* Inline Accessible Error Message */
.field-error-msg {
  display: none;
  font-size: 0.75rem;
  color: var(--color-error);
  margin-top: 0.35rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Sibling display when field is invalid */
:is(:user-invalid, .user-invalid-fallback) + .field-error-msg,
.has-error .field-error-msg {
  display: flex;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 600px) {
  .form-grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.form-footnote {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 0.75rem;
  text-align: center;
}

/* 6. Section Styling */
.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  max-width: 680px;
  margin-bottom: 3rem;
}

.section-header.text-center {
  margin-inline: auto;
  text-align: center;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  margin-bottom: 0.5rem;
  display: inline-block;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 7. Appliance Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.service-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-primary);
  box-shadow: var(--box-shadow-md);
}

.service-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background-color: var(--brand-subtle);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.service-card-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  margin-bottom: 0.35rem;
}

.service-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.015em;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.service-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.service-bullet-list {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.service-bullet-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.service-bullet-item svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

.btn-card-action {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.btn-card-action:hover {
  background-color: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #ffffff;
}

/* 8. Process Section (3-Step Modern Timeline) */
.process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .process-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.process-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.process-step-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--brand-primary);
  opacity: 0.85;
  margin-bottom: 1rem;
  line-height: 1;
}

.process-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
  letter-spacing: -0.015em;
}

.process-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 9. Regional Coverage Section */
.coverage-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--box-shadow-sm);
}

.coverage-search-bar {
  display: flex;
  gap: 0.75rem;
  max-width: 520px;
  margin-bottom: 2rem;
}

.coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .coverage-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .coverage-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.city-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: border-color var(--transition-fast);
}

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

.city-icon-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.city-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.city-sub {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: 0.2rem;
}

.city-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
  font-weight: 600;
  margin-top: 0.4rem;
}

/* 10. FAQ Accordion (Native <details> with modern styling) */
.faq-list {
  max-width: 780px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--brand-primary);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--text-tertiary);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-summary::after {
  content: "−";
  color: var(--brand-primary);
}

.faq-content {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 11. Footer */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  }
}

.footer-col-title {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--brand-primary);
}

.office-address {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.disclaimer-box {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-size: 0.775rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.footer-bottom-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* 12. Mobile Floating Action Bar */
.mobile-action-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 45;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
}

@media (min-width: 768px) {
  .mobile-action-bar {
    display: none;
  }
}

.mobile-action-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  height: 48px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.btn-mobile-call {
  background-color: var(--accent-amber-bg);
  color: var(--accent-amber);
  border: 1px solid color-mix(in srgb, var(--accent-amber) 30%, transparent);
}

.btn-mobile-book {
  background-color: var(--brand-primary);
  color: #ffffff;
}

/* Extra space for body on mobile so footer isn't obscured by floating bar */
@media (max-width: 767px) {
  body {
    padding-bottom: 70px;
  }
}