/* ========================================
   SUNRONN.APP - Premium Design System
   Traffic Arbitrage Landing Page
   ======================================== */

/* CSS Custom Properties */
:root {
  /* Color Palette - Premium Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #131318;
  --color-bg-tertiary: #1a1a24;

  /* Vibrant Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-hero: linear-gradient(
    135deg,
    #667eea 0%,
    #764ba2 50%,
    #f093fb 100%
  );

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #b8b8c8;
  --color-text-muted: #787888;

  /* Accent Colors */
  --color-accent-purple: #667eea;
  --color-accent-pink: #f093fb;
  --color-accent-cyan: #00f2fe;

  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);

  /* Typography */
  --font-primary:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-h1: clamp(2.5rem, 5vw, 4rem);
  --font-size-h2: clamp(2rem, 4vw, 3rem);
  --font-size-h3: clamp(1.5rem, 3vw, 2rem);
  --font-size-body: clamp(1rem, 2vw, 1.125rem);
  --font-size-small: 0.875rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

/* Import Google Font */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap");

/* ========================================
   TYPOGRAPHY
   ======================================== */

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

h1 {
  font-size: var(--font-size-h1);
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

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

/* ========================================
   LAYOUT UTILITIES
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.section:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

/* ========================================
   GLASS CARD COMPONENT
   ======================================== */

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--glass-shadow);
  padding: var(--spacing-md);
  transition:
    transform var(--transition-normal),
    box-shadow var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 48px 0 rgba(102, 126, 234, 0.3);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0) 100%
  );
  z-index: -1;
  transition: transform var(--transition-normal);
  transform: translateY(100%);
}

.btn:hover::before {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary:hover {
  background: var(--glass-bg);
  border-color: var(--color-accent-cyan);
}

/* ========================================
   NAVIGATION MENU
   ======================================== */

.nav-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.nav-menu.scrolled {
  background: rgba(10, 10, 15, 0.95);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem var(--spacing-md);
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: opacity var(--transition-fast);
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: all var(--transition-normal);
  transform: translateX(-50%);
}

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

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

.nav-link-cta {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  padding: 0.5rem 1.5rem;
}

.nav-link-cta::after {
  display: none;
}

.nav-link-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--color-bg-primary);
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(102, 126, 234, 0.15) 0%,
    transparent 70%
  );
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.hero-content {
  text-align: center;
  z-index: 2;
  max-width: 900px;
  animation: fadeInUp 1s ease;
}

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

.hero h1 {
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 1s ease 0.2s both;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 1s ease 0.4s both;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease 0.6s both;
}

/* ========================================
   SERVICES GRID
   ======================================== */

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

.service-card {
  position: relative;
}

.service-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.service-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

/* ========================================
   CASES SECTION
   ======================================== */

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.case-card {
  padding: 0;
  overflow: hidden;
}

.case-header {
  padding: var(--spacing-md);
  background: var(--gradient-primary);
  position: relative;
}

.case-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-small);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.case-header h3 {
  color: var(--color-text-primary);
  margin-bottom: 0;
  font-size: 1.5rem;
}

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

.case-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.case-challenge,
.case-solution,
.case-results {
  margin-bottom: var(--spacing-md);
}

.case-challenge h4,
.case-solution h4,
.case-results h4 {
  color: var(--color-accent-cyan);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.case-solution ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.case-solution li {
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
  color: var(--color-text-secondary);
}

.case-solution li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent-purple);
  font-weight: 700;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.metric {
  text-align: center;
  padding: var(--spacing-sm);
  background: var(--glass-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.metric-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   TESTIMONIALS
   ======================================== */

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.testimonial-card {
  position: relative;
  padding: var(--spacing-lg) var(--spacing-md);
}

.testimonial-quote {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

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

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.author-info h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.author-info p {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ========================================
   CTA SECTION
   ======================================== */

.cta-section {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="rgba(255,255,255,0.1)"/></svg>');
  opacity: 0.3;
}

.cta-content {
  position: relative;
  z-index: 2;
}

.cta-section h2 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg) 0 var(--spacing-md);
  text-align: center;
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  max-width: 600px;
  margin: 0 auto;
}

.footer h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.footer p {
  margin-bottom: var(--spacing-md);
}

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

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-cyan);
}

.footer-bottom {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

/* ========================================
   ANIMATIONS
   ======================================== */

.fade-in {
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  animation: slideInLeft 0.8s ease forwards;
}

@keyframes slideInLeft {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  animation: slideInRight 0.8s ease forwards;
}

@keyframes slideInRight {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-sm);
  }

  .nav-link {
    padding: 0.5rem;
    font-size: 0.875rem;
  }

  .nav-link-cta {
    padding: 0.5rem 1rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .services-grid,
  .testimonials-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-xl: 3rem;
    --spacing-lg: 2rem;
  }

  .section {
    padding: var(--spacing-lg) 0;
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}