/* ========================================
   AdvancivEx - Premium Consulting Website
   Dark Tech Aesthetic with Glassmorphism
   ======================================== */

/* ========================================
   CSS Variables & Root Styles
   ======================================== */

:root {
  /* Colors */
  --bg-primary: #0B0F1A;
  --bg-secondary: #111827;
  --bg-tertiary: #1F2937;
  --accent-blue: #2563EB;
  --accent-blue-light: #3B82F6;
  --accent-purple: #7C3AED;
  --accent-cyan: #06B6D4;
  --text-primary: #FFFFFF;
  --text-secondary: #D1D5DB;
  --text-muted: #9CA3AF;
  --border-color: rgba(255, 255, 255, 0.1);
  --glow-blue: rgba(37, 99, 235, 0.2);
  --glow-purple: rgba(124, 58, 237, 0.2);

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ========================================
   Global Styles
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-4xl);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-3xl);
  color: var(--text-primary);
}

h3 {
  font-size: var(--font-size-xl);
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--accent-blue-light);
}

/* ========================================
   Header & Navigation
   ======================================== */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 15, 26, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  transition: box-shadow var(--transition-base);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.05);
}

nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

nav a:hover,
nav a.active {
  color: var(--accent-blue);
}

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  color: var(--accent-blue);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-2xl) var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.1), transparent);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.1), transparent);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 900px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-ctas {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  text-align: center;
  font-size: var(--font-size-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-light));
  color: white;
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 0 30px rgba(37, 99, 235, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(124, 58, 237, 0.2);
  color: var(--accent-purple);
  border: 1px solid var(--accent-purple);
}

.btn-secondary:hover {
  background: rgba(124, 58, 237, 0.3);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  display: block;
  width: 100%;
}

/* ========================================
   Sections
   ======================================== */

section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.section-title p {
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Cards & Glassmorphism
   ======================================== */

.card {
  background: rgba(31, 41, 55, 0.4);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 8px 32px rgba(37, 99, 235, 0.1);
  transform: translateY(-4px);
}

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

.card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.card p {
  position: relative;
  z-index: 1;
}

/* ========================================
   Grid Layout
   ======================================== */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Service Cards
   ======================================== */

.service-card {
  text-align: center;
}

.service-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.service-card h3 {
  color: var(--accent-blue);
}

/* ========================================
   Package Cards
   ======================================== */

.package-card {
  display: flex;
  flex-direction: column;
  position: relative;
}

.package-card.featured {
  border-color: var(--accent-blue);
  box-shadow: 0 0 30px rgba(37, 99, 235, 0.2);
  transform: scale(1.05);
}

@media (max-width: 768px) {
  .package-card.featured {
    transform: scale(1);
  }
}

.package-name {
  color: var(--accent-blue);
  margin-bottom: var(--spacing-sm);
}

.package-price {
  font-size: var(--font-size-2xl);
  color: var(--accent-blue);
  font-weight: 700;
  margin: var(--spacing-md) 0;
}

.package-features {
  list-style: none;
  margin: var(--spacing-lg) 0;
  flex-grow: 1;
}

.package-features li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

.package-features li:last-child {
  border-bottom: none;
}

.package-features li::before {
  content: '✓ ';
  color: var(--accent-blue);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

/* ========================================
   Forms
   ======================================== */

form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

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

@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-base);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: rgba(31, 41, 55, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.2);
  background: rgba(31, 41, 55, 0.8);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ========================================
   FAQ Accordion
   ======================================== */

.faq-container {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: rgba(31, 41, 55, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.1);
}

.faq-question {
  padding: var(--spacing-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(31, 41, 55, 0.2);
  transition: background var(--transition-fast);
}

.faq-item:hover .faq-question {
  background: rgba(37, 99, 235, 0.05);
}

.faq-question h4 {
  margin: 0;
  color: var(--text-primary);
}

.faq-toggle {
  color: var(--accent-blue);
  font-size: var(--font-size-xl);
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: var(--spacing-lg);
  margin: 0;
  color: var(--text-secondary);
}

/* ========================================
   Utility Classes
   ======================================== */

.max-width-900 {
  max-width: 900px;
  margin: 0 auto;
}

.case-study-metric {
  font-size: var(--font-size-3xl);
  color: var(--accent-blue);
  font-weight: 700;
  margin: var(--spacing-lg) 0;
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* ========================================
   Footer
   ======================================== */

footer {
  background: rgba(11, 15, 26, 0.8);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  color: var(--accent-blue);
  margin-bottom: var(--spacing-md);
}

.footer-section p {
  color: var(--text-muted);
  font-size: var(--font-size-base);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-base);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
  section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .header-container {
    padding: var(--spacing-md);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-xl: 1.5rem;
  }

  .mobile-menu-toggle {
    display: block;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    border-bottom: 1px solid var(--border-color);
  }

  nav.active {
    max-height: 300px;
  }

  nav a {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: block;
  }

  nav a.active::after {
    display: none;
  }

  .hero {
    min-height: 50vh;
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero-ctas {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

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

  .package-card.featured {
    transform: scale(1);
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --font-size-xl: 1.125rem;
    --spacing-2xl: 1.5rem;
    --spacing-xl: 1rem;
    --spacing-lg: 1rem;
  }

  section {
    padding: var(--spacing-xl) var(--spacing-sm);
  }

  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .section-title h2 {
    font-size: var(--font-size-2xl);
  }

  .card {
    padding: var(--spacing-md);
  }

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

  .header-container {
    padding: var(--spacing-sm);
  }
}