/* ============================================
   Prime Agency Service - 2025 Design System
   ============================================ */

:root {
  /* Brand Colors */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-secondary: #ec4899;
  --color-secondary-light: #f472b6;
  
  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-bg-elevated: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-soft: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  --gradient-hero: radial-gradient(ellipse at top, rgba(99, 102, 236, 0.15) 0%, transparent 50%),
                    radial-gradient(ellipse at bottom right, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Inter', var(--font-sans);
  
  /* Spacing Scale (8pt grid) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-soft: 0 20px 50px -12px rgba(99, 102, 241, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Container */
  --container-width: min(1200px, 92vw);
  --container-padding: clamp(1rem, 4vw, 2rem);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary);
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
  line-height: 1.1;
}

h2 {
  font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw + 0.5rem, 2.25rem);
}

h4 {
  font-size: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
}

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

.lead {
  font-size: clamp(1.125rem, 1.5vw + 0.5rem, 1.5rem);
  line-height: 1.6;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* ============================================
   Layout Utilities
   ============================================ */

.container {
  width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.section {
  padding-block: clamp(4rem, 8vw, 8rem);
}

.section--light {
  background: var(--color-bg-soft);
}

.section--dark {
  background: var(--color-text);
  color: var(--color-bg);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-bg);
}

.section--dark p {
  color: rgba(255, 255, 255, 0.8);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin-inline: auto;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--gradient-soft);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-soft);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 25px 60px -12px rgba(99, 102, 241, 0.35);
  color: white;
}

.btn--ghost {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}

.btn--ghost:hover {
  background: var(--color-bg-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.button-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

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

.card {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-light);
}

.card--service {
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

/* ============================================
   Grid System
   ============================================ */

.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   Header
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-md);
}

.brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1.25rem;
}

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

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

.site-nav a {
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  width: 100%;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-xs);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

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

.hero {
  position: relative;
  padding-block: clamp(6rem, 12vw, 10rem);
  background: var(--gradient-hero), var(--color-bg);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

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

.hero h1 {
  margin-bottom: var(--space-lg);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .lead {
  margin-bottom: var(--space-xl);
  max-width: 700px;
  margin-inline: auto;
}

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

.site-footer {
  background: var(--color-text);
  color: var(--color-bg);
  padding-block: clamp(3rem, 6vw, 5rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand h3 {
  color: var(--color-bg);
  margin-bottom: var(--space-md);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-section h4 {
  color: var(--color-bg);
  margin-bottom: var(--space-md);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

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

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

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

.form-group {
  margin-bottom: var(--space-lg);
}

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

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* ============================================
   Testimonials
   ============================================ */

.testimonial {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.testimonial-text {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-info h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.testimonial-info p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
}

/* ============================================
   Logo Strip
   ============================================ */

.logo-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(2rem, 5vw, 4rem);
  flex-wrap: wrap;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: opacity var(--transition-base);
}

.logo-strip:hover {
  opacity: 0.8;
}

.logo-strip img {
  height: 40px;
  width: auto;
}

/* ============================================
   Process Steps
   ============================================ */

.process-step {
  text-align: center;
  position: relative;
}

.process-number {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-inline: auto;
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-soft);
}

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: 999;
  }
  
  .site-nav.open {
    transform: translateX(0);
  }
  
  .site-nav ul {
    flex-direction: column;
    gap: var(--space-lg);
  }
  
  .button-group {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding-block: clamp(4rem, 8vw, 6rem);
  }
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ============================================
   Utilities
   ============================================ */

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}