/* Base Variables - Tech Modern Aesthetic */
:root {
  /* Tech Modern Colors */
  --color-primary: #38bdf8;         /* Sky Blue */
  --color-primary-rgb: 56, 189, 248;
  --color-secondary: #818cf8;       /* Indigo */
  --color-accent: #f472b6;          /* Pink */
  
  --color-bg: #0f172a;              /* Slate 900 */
  --color-bg-rgb: 15, 23, 42;
  --color-surface: rgba(30, 41, 59, 0.6);   /* Slate 800 with transparency */
  --color-surface-hover: rgba(51, 65, 85, 0.7);
  --color-text-primary: #f8fafc;    /* Slate 50 */
  --color-text-secondary: #94a3b8;  /* Slate 400 */
  --color-border: rgba(255, 255, 255, 0.08);

  /* Functional Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Spacing System (8px grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --space-5xl: 128px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Shadows (Dark mode shadows) */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.6);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.7);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.15);

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  
  /* Easing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out: cubic-bezier(0.76, 0, 0.24, 1);
}

/* Base Reset & Typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text-primary);
}

h1 { 
  font-size: clamp(3rem, 6vw + 1rem, 5.5rem); 
  letter-spacing: -0.04em;
}
h2 { 
  font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
  letter-spacing: -0.03em;
}
h3 { 
  font-size: clamp(1.5rem, 2.5vw + 0.5rem, 2.25rem);
  letter-spacing: -0.02em;
}
p {
  font-size: clamp(1rem, 1vw + 0.5rem, 1.125rem);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

/* Grain Overlay (Atmosphere) */
.grain-overlay::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

/* Gradient Mesh Backgrounds */
.bg-mesh-hero {
  position: relative;
}
.bg-mesh-hero::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 70vw; height: 70vw;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, transparent 60%);
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
}
.bg-mesh-hero::after {
  content: '';
  position: absolute;
  bottom: -40%; left: -20%;
  width: 80vw; height: 80vw;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.1) 0%, transparent 60%);
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
}

/* Layout & Grid */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

section {
  padding: 120px 0;
  position: relative;
}

.hero-section {
  padding: 180px 0 120px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.grid {
  display: grid;
  gap: var(--space-2xl);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  section { padding: 80px 0; }
  .hero-section { padding: 140px 0 80px; }
}

/* Components: Navigation */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: var(--space-md) 0;
  background: rgba(var(--color-bg-rgb), 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all 0.3s var(--ease-out-expo);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand span {
  color: var(--color-primary);
}

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

.nav-link {
  color: var(--color-text-primary);
  font-weight: 500;
  font-size: 0.95rem;
}

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

@media (max-width: 768px) {
  .nav-links { display: none; } /* In full implementation, add a mobile menu */
}

/* Components: Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.4s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  color: var(--color-bg);
  background: var(--color-primary);
  border: none;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  color: var(--color-text-primary);
  background: transparent;
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-outline {
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--color-primary);
}

/* Components: Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all 0.5s var(--ease-out-expo);
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(56, 189, 248, 0.3);
  background: var(--color-surface-hover);
}

/* For Pricing Highlight */
.card-popular {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  position: relative;
}

.card-popular::before {
  content: 'En Popüler';
  position: absolute;
  top: 0;
  right: 24px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 0 0 8px 8px;
  transform: translateY(-1px);
}

/* UI Elements */
.badge {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

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

/* Icon Wrap */
.icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(56, 189, 248, 0.2);
}
.icon-wrap svg {
  width: 28px;
  height: 28px;
}

/* Animations (Animate on Scroll) */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.animate-on-scroll {
  opacity: 0;
  visibility: hidden;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  visibility: visible;
  animation: fadeInUp 0.8s var(--ease-out-expo) forwards;
}

/* Staggered delays */
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }

/* Miscellaneous Lists */
.check-list {
  list-style: none;
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-primary);
}

.check-list li svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.check-list li.disabled {
  color: var(--color-text-secondary);
  opacity: 0.5;
}

.check-list li.disabled svg {
  color: var(--color-text-secondary);
}

/* Pricing Section Specifics */
.price-display {
  margin: var(--space-md) 0 var(--space-xl);
}
.price-display h3 {
  font-size: 3rem;
  margin: 0;
}
.price-display span {
  color: var(--color-text-secondary);
  font-size: 1rem;
}

/* Social Proof Bar */
.logo-bar {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.02);
}

.logo-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xl);
  opacity: 0.6;
}

/* FAQ Accordion */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out-expo), margin-top 0.4s ease;
  color: var(--color-text-secondary);
}
.faq-item.active .faq-answer {
  max-height: 500px;
  margin-top: var(--space-sm);
}
.faq-icon {
  transition: transform 0.3s ease;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

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