/* ========================================
   CSS Variables & Base Setup
   ======================================== */
:root {
  /* Colors */
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: rgba(255, 255, 255, 0.03);
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --accent-start: #7dd3fc;
  --accent-end: #a78bfa;
  --border-color: rgba(255, 255, 255, 0.1);
  --focus-ring: rgba(125, 211, 252, 0.5);
  
  /* Spacing */
  --space-xs: clamp(0.5rem, 1vw, 0.75rem);
  --space-sm: clamp(0.75rem, 1.5vw, 1rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2.5rem);
  --space-xl: clamp(2rem, 4vw, 4rem);
  
  /* Typography */
  --font-base: clamp(1rem, 1.125vw, 1.125rem);
  --font-sm: clamp(0.875rem, 1vw, 1rem);
  --font-lg: clamp(1.25rem, 1.5vw, 1.5rem);
  --font-xl: clamp(1.5rem, 2vw, 2rem);
  --font-2xl: clamp(2rem, 3vw, 3rem);
  --font-3xl: clamp(2.5rem, 4vw, 4rem);
  
  /* Layout */
  --container-max: 1080px;
  --border-radius: 12px;
  --border-radius-lg: 14px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  font-size: var(--font-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

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

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

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

h4 {
  font-size: var(--font-lg);
}

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

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

a:hover,
a:focus {
  color: var(--accent-end);
  outline: none;
}

a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ========================================
   Skip Link
   ======================================== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: var(--space-sm);
  z-index: 1000;
  border-radius: var(--border-radius);
}

.skip-link:focus {
  top: var(--space-sm);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-xl) 0;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--text-primary);
}

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

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-size: var(--font-sm);
  font-weight: 500;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
}

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

.phone-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--accent-start);
  font-weight: 600;
  font-size: var(--font-sm);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition);
}

.phone-link:hover,
.phone-link:focus {
  color: var(--accent-end);
  background: rgba(125, 211, 252, 0.1);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-xl);
  cursor: pointer;
  padding: var(--space-xs);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius);
  transition: background var(--transition);
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle:focus {
  background: var(--bg-card);
  outline: none;
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }
  
  .nav-list.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .phone-link {
    margin-top: var(--space-sm);
  }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: var(--space-xl) 0;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subhead {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto var(--space-xl);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-base);
  font-weight: 600;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: var(--bg-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(125, 211, 252, 0.3);
  outline: none;
}

.btn-primary:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:focus {
  border-color: var(--accent-start);
  color: var(--accent-start);
  outline: none;
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: rgba(125, 211, 252, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.card-title {
  font-size: var(--font-lg);
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.card-problem {
  font-weight: 600;
  color: var(--accent-start);
  margin-bottom: var(--space-xs);
}

.card-approach {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.card-deliverables {
  font-size: var(--font-sm);
  color: var(--text-muted);
  list-style: none;
  padding-left: 0;
}

.card-deliverables li {
  margin-bottom: var(--space-xs);
  padding-left: var(--space-md);
  position: relative;
}

.card-deliverables li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-start);
}

/* ========================================
   Grid Layouts
   ======================================== */
.grid {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
  grid-auto-flow: row;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  grid-auto-rows: min-content;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ========================================
   KPI Row
   ======================================== */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  margin: var(--space-xl) 0;
}

.kpi-item {
  text-align: center;
}

.kpi-value {
  font-size: var(--font-2xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-xs);
}

.kpi-label {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* ========================================
   Forms
   ======================================== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: var(--font-base);
  font-family: inherit;
  transition: all var(--transition);
  min-height: 44px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-start);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

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

.alert-box {
  background: rgba(125, 211, 252, 0.1);
  border: 1px solid rgba(125, 211, 252, 0.3);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.alert-box strong {
  color: var(--accent-start);
  font-size: var(--font-lg);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-xl) 0;
  margin-top: var(--space-xl);
}

.footer-inner {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-sm);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-link:hover,
.footer-link:focus {
  color: var(--accent-start);
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
  text-align: center;
}

.mt-xl {
  margin-top: var(--space-xl);
}

.mb-xl {
  margin-bottom: var(--space-xl);
}

.values-list {
  list-style: none;
  padding-left: 0;
}

.values-list li {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  position: relative;
}

.values-list strong {
  color: var(--accent-start);
}

.card-centered {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.card-wide {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.grid .card-wide {
  grid-column: 1 / -1;
}

.result-text {
  margin-top: var(--space-md);
  font-weight: 600;
  color: var(--accent-start);
}

.contact-info {
  margin-top: var(--space-lg);
}

.contact-cta {
  margin-top: var(--space-lg);
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.sticky-phone {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 50;
  display: none;
}

@media (max-width: 768px) {
  .sticky-phone {
    display: flex;
  }
  
  .sticky-phone .btn {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 768px) {
  .hero h1 {
    font-size: var(--font-2xl);
  }
  
  .hero-subhead {
    font-size: var(--font-base);
  }
  
  .kpi-row {
    grid-template-columns: 1fr;
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}