/* ========================================
   CREATIVE AGENCY - DESIGN SYSTEM
   ======================================== */

/* === CUSTOM PROPERTIES === */
:root {
  /* Colors */
  --color-primary: #0A0A0A;
  --color-secondary: #F5F5F5;
  --color-accent: #FF6B35;
  --color-text: #1A1A1A;
  --color-text-light: #6B6B6B;
  --color-border: #E0E0E0;
  --color-white: #FFFFFF;

  /* Typography Scale */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-primary);

  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 2rem;        /* 32px */
  --text-4xl: 2.5rem;      /* 40px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  --text-7xl: 4.5rem;      /* 72px */
  --text-8xl: 6rem;        /* 96px */
  --text-9xl: 8rem;        /* 128px */

  /* Spacing Scale */
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */
  --space-12: 3rem;        /* 48px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-32: 8rem;        /* 128px */

  /* Layout */
  --container-max: 1400px;
  --container-padding: var(--space-6);
  --grid-gap: var(--space-8);

  /* Animation */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

h1 {
  font-size: clamp(var(--text-5xl), 8vw, var(--text-9xl));
  margin-bottom: var(--space-6);
}

h2 {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-7xl));
  margin-bottom: var(--space-6);
}

h3 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

p {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--space-4);
}

.text-large {
  font-size: clamp(var(--text-xl), 2vw, var(--text-3xl));
  line-height: 1.5;
}

.text-small {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* === LAYOUT === */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-32) 0;
}

.section-large {
  padding: clamp(var(--space-24), 15vh, var(--space-32)) 0;
}

/* Modern Grid System */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

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

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

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

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* === NAVIGATION === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(245, 245, 245, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition-base);
}

.nav.hidden {
  transform: translateY(-100%);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-6) var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: transform var(--transition-base);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    background-color: var(--color-secondary);
    flex-direction: column;
    padding: var(--space-8);
    gap: var(--space-4);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    border-top: 1px solid var(--color-border);
  }

  .nav-links.active {
    transform: translateX(0);
  }
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  letter-spacing: 0.02em;
}

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

.btn-primary:hover {
  background-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-large {
  padding: var(--space-6) var(--space-12);
  font-size: var(--text-lg);
}

/* === CARDS === */
.card {
  background-color: var(--color-white);
  border-radius: 0;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.card-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.card:hover .card-image {
  transform: scale(1.05);
}

.service-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.card:hover .service-icon {
  transform: scale(1.1);
}

.card-content {
  padding: var(--space-8);
}

.card-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.card-description {
  font-size: var(--text-base);
  color: var(--color-text-light);
  line-height: 1.6;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-secondary);
  color: var(--color-text);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* === HERO SECTION === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 100px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 10;
}

.hero-title {
  font-size: clamp(var(--text-5xl), 10vw, var(--text-9xl));
  line-height: 0.95;
  margin-bottom: var(--space-8);
  animation: fadeInUp 0.8s var(--transition-base) forwards;
  opacity: 0;
}

.hero-subtitle {
  font-size: clamp(var(--text-xl), 2.5vw, var(--text-3xl));
  color: var(--color-text-light);
  max-width: 600px;
  margin-bottom: var(--space-12);
  animation: fadeInUp 0.8s 0.2s var(--transition-base) forwards;
  opacity: 0;
}

.hero-cta {
  animation: fadeInUp 0.8s 0.4s var(--transition-base) forwards;
  opacity: 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 {
  animation: fadeIn 0.6s var(--transition-base) forwards;
}

.slide-in-left {
  animation: slideInLeft 0.6s var(--transition-base) forwards;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--transition-base), transform 0.6s var(--transition-base);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === FORM === */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  border: 2px solid var(--color-border);
  background-color: var(--color-white);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

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

/* === FOOTER === */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-24) 0 var(--space-8);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--text-sm);
}

/* === UTILITIES === */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  :root {
    --container-padding: var(--space-4);
    --grid-gap: var(--space-4);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .hero {
    min-height: 80vh;
  }
}