/* ============================================================
   UBER ATTACHMENT SERVICE CHENNAI - MASTER STYLESHEET
   Full Multi-Device Responsive UI (Mobile to 4K Ultra HD)
   ============================================================ */

/* DARK THEME (DEFAULT) */
:root, [data-theme="dark"] {
  --bg-main: #0b132b;
  --bg-topbar: #050b18;
  --bg-nav: rgba(11, 19, 43, 0.92);
  --bg-nav-scrolled: rgba(7, 12, 28, 0.98);
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-hover: rgba(40, 53, 76, 0.95);
  --bg-input: #0f172a;
  --bg-footer: #050b18;
  --bg-modal: #0f172a;

  --border-color: rgba(255, 255, 255, 0.15);
  --border-focus: #00d2ff;

  --accent-cyan: #00d2ff;
  --accent-blue: #2563eb;
  --accent-gold: #ffb703;
  --accent-amber: #fb8500;
  --accent-green: #10b981;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-contrast: #0f172a;

  --box-shadow-card: 0 10px 30px rgba(0, 0, 0, 0.45);
  --box-shadow-hover: 0 15px 35px rgba(0, 210, 255, 0.25);

  --font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* LIGHT THEME */
[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-topbar: #e2e8f0;
  --bg-nav: rgba(255, 255, 255, 0.94);
  --bg-nav-scrolled: rgba(255, 255, 255, 0.98);
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #ffffff;
  --bg-footer: #0f172a;
  --bg-modal: #ffffff;

  --border-color: rgba(0, 0, 0, 0.12);
  --border-focus: #2563eb;

  --accent-cyan: #0284c7;
  --accent-blue: #1d4ed8;
  --accent-gold: #d97706;
  --accent-amber: #d97706;
  --accent-green: #059669;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-contrast: #ffffff;

  --box-shadow-card: 0 10px 30px rgba(15, 23, 42, 0.08);
  --box-shadow-hover: 0 15px 35px rgba(2, 132, 199, 0.18);
}

/* Global Reset & Typography */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
  transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 800;
}

p, span, label, li {
  color: var(--text-secondary);
}

.text-muted {
  color: var(--text-muted) !important;
}

a {
  text-decoration: none;
  transition: var(--transition-fast);
}

/* Glassmorphism Utility Classes */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--box-shadow-card);
  transition: var(--transition-fast);
}

.glass-nav {
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-fast);
}

.glass-nav.scrolled {
  background: var(--bg-nav-scrolled);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* Gradient Text */
.gradient-text-cyan {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-gold {
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-amber) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Top Bar */
.top-bar {
  background: var(--bg-topbar);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.88rem;
  transition: background 0.3s ease;
}

.top-bar span, .top-bar a {
  color: var(--text-secondary);
}

.top-bar a:hover {
  color: var(--accent-gold);
}

.navbar-brand img, footer img {
  height: 48px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  transition: filter 0.3s ease;
}

/* Light Theme Logo Invert Filter for Navbar Brand ONLY (Footer logo is always white) */
[data-theme="light"] .navbar-brand img {
  filter: invert(1) brightness(0.15);
}

footer img {
  filter: none !important;
}

.nav-link {
  color: var(--text-primary) !important;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.6rem 0.9rem !important;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan) !important;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-gold));
  transition: var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 80%;
}

/* Dropdown Menu Styling */
.glass-dropdown {
  background: var(--bg-card) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color) !important;
  border-radius: 14px !important;
  padding: 8px !important;
  box-shadow: var(--box-shadow-card) !important;
  min-width: 220px;
}

.dropdown-item {
  color: var(--text-primary) !important;
  font-weight: 600;
  padding: 10px 14px !important;
  border-radius: 8px;
  transition: var(--transition-fast);
}

.dropdown-item:hover, .dropdown-item:focus {
  background: rgba(0, 210, 255, 0.15) !important;
  color: var(--accent-cyan) !important;
}

.dropdown-toggle::after {
  vertical-align: middle;
  margin-left: 6px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 700;
  border-radius: 50px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  transition: var(--transition-fast);
  cursor: pointer;
}

.theme-toggle-btn:hover {
  background: var(--accent-cyan);
  color: #ffffff;
  border-color: var(--accent-cyan);
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 88vh;
  padding-top: 140px;
  padding-bottom: 70px;
  background: radial-gradient(circle at 10% 20%, rgba(0, 210, 255, 0.12) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(255, 183, 3, 0.1) 0%, transparent 40%),
              linear-gradient(180deg, var(--bg-main) 0%, var(--bg-topbar) 100%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.4);
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.hero-title {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
}

.stat-box {
  padding: 20px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: var(--transition-fast);
}

.stat-box:hover {
  transform: translateY(-4px);
  border-color: var(--accent-gold);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent-gold);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Feature Cards & Vertical Cards */
.vertical-card {
  height: 100%;
  padding: 30px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
  box-shadow: var(--box-shadow-card);
}

.vertical-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  box-shadow: var(--box-shadow-hover);
}

.vertical-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-gold));
  opacity: 0;
  transition: var(--transition-fast);
}

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

.icon-wrapper {
  width: 65px;
  height: 65px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.icon-cyan {
  background: rgba(0, 210, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 210, 255, 0.3);
}

.icon-gold {
  background: rgba(255, 183, 3, 0.12);
  color: var(--accent-gold);
  border: 1px solid rgba(255, 183, 3, 0.3);
}

.icon-green {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.icon-purple {
  background: rgba(168, 85, 247, 0.12);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Drive-to-Own Banner */
.drive-to-own-banner {
  background: var(--bg-card);
  border: 2px solid var(--accent-gold);
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 20px 50px rgba(255, 183, 3, 0.15);
}

/* Step Timeline */
.timeline-steps {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin: 30px 0;
}

.timeline-steps::before {
  content: '';
  position: absolute;
  top: 25px;
  left: 10%;
  right: 10%;
  height: 3px;
  background: var(--border-color);
  z-index: 1;
}

.step-item {
  position: relative;
  z-index: 2;
  text-align: center;
  flex: 1;
}

.step-circle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-main);
  border: 3px solid var(--accent-gold);
  color: var(--accent-gold);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px auto;
  font-size: 1.2rem;
}

/* Interactive Calculator */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-cyan);
  border-radius: 20px;
  padding: 30px;
}

.calc-output-box {
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: 12px;
  padding: 18px;
  text-align: center;
}

/* Form Controls & High Visibility */
.form-control, .form-select {
  background: var(--bg-input) !important;
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary) !important;
  border-radius: 10px !important;
  padding: 12px 16px !important;
  font-size: 0.95rem;
  font-weight: 600;
}

.form-control:focus, .form-select:focus {
  border-color: var(--border-focus) !important;
  box-shadow: 0 0 0 0.25rem rgba(0, 210, 255, 0.25) !important;
}

.form-control::placeholder {
  color: var(--text-muted) !important;
  font-weight: 400;
}

.form-label {
  font-weight: 800;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-check-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  user-select: none;
}

/* Custom Buttons */
.btn-cyan {
  background: linear-gradient(135deg, #00d2ff 0%, #0066ff 100%);
  color: #ffffff !important;
  font-weight: 800;
  padding: 12px 28px;
  border-radius: 50px;
  border: none;
  box-shadow: 0 8px 20px rgba(0, 102, 255, 0.35);
  transition: var(--transition-fast);
}

.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 210, 255, 0.5);
  color: #ffffff !important;
}

.btn-gold {
  background: linear-gradient(135deg, #ffb703 0%, #fb8500 100%);
  color: #0f172a !important;
  font-weight: 800;
  padding: 12px 28px;
  border-radius: 50px;
  border: none;
  box-shadow: 0 8px 20px rgba(255, 183, 3, 0.35);
  transition: var(--transition-fast);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 183, 3, 0.5);
  color: #0f172a !important;
}

.btn-outline-custom {
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 700;
  padding: 12px 26px;
  border-radius: 50px;
  background: transparent;
  transition: var(--transition-fast);
}

.btn-outline-custom:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(0, 210, 255, 0.08);
}

/* High Contrast Section Badges */
.bg-cyan-tag {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%) !important;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.bg-green-tag {
  background: linear-gradient(135deg, #059669 0%, #047857 100%) !important;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
}

/* Floating Action Buttons */
.floating-whatsapp {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  color: #ffffff;
  border-radius: 50px;
  text-align: center;
  font-size: 32px;
  box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  animation: pulse-green 2s infinite;
}

.floating-whatsapp:hover {
  transform: scale(1.1);
  color: #ffffff;
}

.floating-call {
  position: fixed;
  bottom: 95px;
  right: 25px;
  width: 52px;
  height: 52px;
  background-color: var(--accent-blue);
  color: #ffffff;
  border-radius: 50px;
  text-align: center;
  font-size: 24px;
  box-shadow: 0 10px 20px rgba(0, 102, 255, 0.4);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.floating-call:hover {
  transform: scale(1.1);
  color: #ffffff;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
  70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* Modal Styling */
.modal-content {
  background: var(--bg-modal) !important;
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color) !important;
  color: var(--text-primary) !important;
  border-radius: 20px !important;
}

.modal-header {
  border-bottom: 1px solid var(--border-color) !important;
}

.modal-footer {
  border-top: 1px solid var(--border-color) !important;
}

[data-theme="light"] .btn-close-white {
  filter: none;
}
[data-theme="dark"] .btn-close-white {
  filter: invert(1) grayscale(100%) brightness(200%);
}

/* Accordion & Tabs */
.accordion-item {
  background: var(--bg-card) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
}

.accordion-button {
  background: transparent !important;
  color: var(--text-primary) !important;
  font-weight: 700;
}

[data-theme="light"] .accordion-button::after {
  filter: none;
}
[data-theme="dark"] .accordion-button::after {
  filter: invert(1);
}

.nav-pills .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 700;
  border-radius: 10px;
}

.nav-pills .nav-link.active {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue)) !important;
  color: #ffffff !important;
}

/* Footer UI Design & High Visibility Text */
footer {
  background: var(--bg-footer);
  border-top: 2px solid var(--accent-cyan);
  padding-top: 60px;
  padding-bottom: 30px;
  color: #cbd5e1;
  transition: var(--transition-fast);
}

[data-theme="dark"] footer {
  background: #050b18;
  color: #cbd5e1;
}

[data-theme="light"] footer {
  background: #0f172a;
  color: #e2e8f0;
}

footer h5 {
  color: #ffffff !important;
  font-weight: 800;
  margin-bottom: 20px;
  font-size: 1.15rem;
  letter-spacing: 0.5px;
}

footer p, footer li {
  font-size: 0.95rem;
  line-height: 1.6;
}

footer p.text-muted {
  color: #cbd5e1 !important;
}

footer ul {
  padding: 0;
  list-style: none;
}

footer ul li {
  margin-bottom: 12px;
}

footer ul li a {
  color: #e2e8f0 !important;
  font-weight: 500;
  transition: var(--transition-fast);
}

footer ul li a:hover {
  color: var(--accent-cyan) !important;
  padding-left: 4px;
}

footer .footer-social-link {
  width: 42px;
  height: 42px;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

footer .footer-social-link:hover {
  background: var(--accent-cyan);
  transform: translateY(-3px);
  color: #ffffff !important;
}

footer .footer-bottom-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
  margin-top: 30px;
  color: #94a3b8;
}

/* ============================================================
   ADVANCED RESPONSIVE MEDIA QUERIES (MOBILE TO 4K ULTRA HD)
   ============================================================ */

/* 1. 4K Ultra HD & Ultra-Wide Monitors (2200px+) */
@media (min-width: 2200px) {
  .container {
    max-width: 1920px !important;
  }
  .hero-section {
    padding-top: 180px;
    padding-bottom: 120px;
  }
  .hero-title {
    font-size: 4.5rem;
  }
  .hero-subtitle {
    font-size: 1.45rem;
  }
  .stat-number {
    font-size: 2.8rem;
  }
  .vertical-card {
    padding: 45px;
  }
  .icon-wrapper {
    width: 80px;
    height: 80px;
    font-size: 2.4rem;
  }
  .btn-cyan, .btn-gold, .btn-outline-custom {
    padding: 16px 36px;
    font-size: 1.15rem;
  }
}

/* 2. 2K & Quad HD Displays (1600px to 2199px) */
@media (min-width: 1600px) and (max-width: 2199px) {
  .container {
    max-width: 1520px !important;
  }
  .hero-title {
    font-size: 3.8rem;
  }
  .hero-subtitle {
    font-size: 1.3rem;
  }
  .vertical-card {
    padding: 38px;
  }
}

/* 3. Notebooks & Small Laptops (992px to 1199px) */
@media (max-width: 1199px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .stat-number {
    font-size: 1.9rem;
  }
  .stat-box {
    padding: 15px 10px;
  }
}

/* 4. Tablets & iPads (768px to 991px) */
@media (max-width: 991px) {
  .hero-section {
    padding-top: 120px;
    padding-bottom: 50px;
  }
  .hero-title {
    font-size: 2.35rem;
    text-align: center;
  }
  .hero-subtitle {
    font-size: 1.05rem;
    text-align: center;
  }
  .hero-badge {
    margin: 0 auto 15px auto;
    display: table;
  }
  .timeline-steps {
    flex-direction: column;
    gap: 24px;
  }
  .timeline-steps::before {
    display: none;
  }
  .drive-to-own-banner {
    padding: 25px;
  }
  .calc-card {
    padding: 22px;
  }
}

/* 5. Mobile Landscape & Phablets (576px to 767px) */
@media (max-width: 767px) {
  .hero-title {
    font-size: 2.0rem;
  }
  .hero-subtitle {
    font-size: 1.0rem;
  }
  .stat-number {
    font-size: 1.6rem;
  }
  .stat-label {
    font-size: 0.75rem;
  }
  .floating-whatsapp {
    width: 52px;
    height: 52px;
    font-size: 28px;
    bottom: 20px;
    right: 18px;
  }
  .floating-call {
    width: 46px;
    height: 46px;
    font-size: 22px;
    bottom: 82px;
    right: 18px;
  }
  .modal-dialog {
    margin: 15px;
  }
}

/* 6. Mobile Portrait (Under 576px) */
@media (max-width: 575px) {
  .top-bar {
    display: none !important;
  }
  .hero-section {
    padding-top: 105px;
    padding-bottom: 40px;
  }
  .hero-title {
    font-size: 1.75rem;
    line-height: 1.25;
  }
  .hero-subtitle {
    font-size: 0.95rem;
  }
  .stat-box {
    padding: 12px 6px;
  }
  .stat-number {
    font-size: 1.4rem;
  }
  .stat-label {
    font-size: 0.7rem;
    letter-spacing: 0;
  }
  .vertical-card {
    padding: 22px;
  }
  .calc-output-box {
    padding: 12px;
  }
  .display-6 {
    font-size: 1.6rem !important;
  }
}