/* ========================================
   Snowflake — Design System & Styles
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-ice: #EAF4F8;
  --color-navy: #0F172A;
  --color-gray: #64748B;
  --color-white: #F8FAFC;
  --color-frost: #38BDF8;
  
  /* Extended palette */
  --color-navy-light: #1E293B;
  --color-gray-light: #94A3B8;
  --color-gray-dark: #475569;
  --color-ice-dark: #CBD5E1;
  
  /* Typography */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;
  
  /* Font sizes - fluid typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --text-3xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  --text-4xl: clamp(2.5rem, 1.8rem + 3.5vw, 4rem);
  --text-5xl: clamp(3rem, 2rem + 5vw, 5.5rem);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;
  
  /* Layout */
  --container-max: 1200px;
  --container-padding: clamp(1.5rem, 5vw, 4rem);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-smooth: 600ms cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Borders */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-navy);
  background-color: var(--color-white);
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

input,
textarea {
  font: inherit;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) 0;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: 
    padding var(--transition-base),
    background var(--transition-base);
}

.nav.scrolled {
  padding: var(--space-md) 0;
  background: rgba(248, 250, 252, 0.95);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.05);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-navy);
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.7;
}

.logo-icon {
  width: 28px;
  height: 28px;
  /* Filter to convert black SVG to frost blue (#38BDF8) */
  filter: invert(68%) sepia(85%) saturate(1000%) hue-rotate(175deg) brightness(100%) contrast(95%);
  transition: filter var(--transition-fast);
}

.nav-logo:hover .logo-icon {
  filter: invert(8%) sepia(20%) saturate(2000%) hue-rotate(190deg) brightness(95%) contrast(95%);
}

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

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-dark);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-navy);
  transition: width var(--transition-base);
}

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

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

.nav-link-cta {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: var(--radius-md);
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast);
}

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

.nav-link-cta:hover {
  background: var(--color-navy-light);
  color: var(--color-white);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  width: 32px;
  height: 24px;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-navy);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.mobile-menu-link {
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-navy);
  opacity: 0;
  transform: translateY(20px);
  transition: 
    opacity var(--transition-smooth),
    transform var(--transition-smooth),
    color var(--transition-fast);
}

.mobile-menu.active .mobile-menu-link {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.active .mobile-menu-link:nth-child(1) { transition-delay: 100ms; }
.mobile-menu.active .mobile-menu-link:nth-child(2) { transition-delay: 150ms; }
.mobile-menu.active .mobile-menu-link:nth-child(3) { transition-delay: 200ms; }
.mobile-menu.active .mobile-menu-link:nth-child(4) { transition-delay: 250ms; }

.mobile-menu-link:hover {
  color: var(--color-frost);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: 
    background var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.btn-primary:hover {
  background: var(--color-navy-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.15);
}

.btn-secondary {
  background: transparent;
  color: var(--color-navy);
  border: 1px solid var(--color-ice-dark);
}

.btn-secondary:hover {
  background: var(--color-ice);
  border-color: var(--color-ice);
}

.btn-full {
  width: 100%;
}

/* --- Section Styling --- */
.section-header {
  margin-bottom: var(--space-3xl);
}

.section-header-centered {
  text-align: center;
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-frost);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-navy);
  max-width: 20ch;
}

.section-header-centered .section-title {
  max-width: none;
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: calc(var(--space-5xl) + 60px);
  padding-bottom: var(--space-4xl);
  position: relative;
  background: linear-gradient(180deg, var(--color-ice) 0%, var(--color-white) 100%);
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.hero-content {
  opacity: 0;
  animation: fadeUp 0.8s var(--transition-smooth) forwards;
  animation-delay: 0.2s;
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-navy);
  margin-bottom: var(--space-xl);
}

.hero-title-line {
  display: block;
}

.hero-subtitle {
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-gray);
  max-width: 42ch;
  margin-bottom: var(--space-2xl);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-visual {
  position: relative;
  opacity: 0;
  animation: fadeUp 0.8s var(--transition-smooth) forwards;
  animation-delay: 0.4s;
}

.hero-lottie {
  width: 100%;
  max-width: 750px;
  height: auto;
  margin-left: auto;
  opacity: 0.7;
  filter: 
    hue-rotate(185deg) 
    saturate(0.6) 
    brightness(1.1);
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0;
  animation: fadeIn 0.8s var(--transition-smooth) forwards;
  animation-delay: 1s;
}

.hero-scroll-text {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray);
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-gray), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

/* --- About Section --- */
.about {
  padding: var(--space-5xl) 0;
  background: var(--color-white);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
}

.about-intro {
  max-width: 50ch;
}

.about-lead {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 400;
  font-style: italic;
  line-height: 1.4;
  color: var(--color-navy);
  margin-bottom: var(--space-xl);
}

.about-text {
  font-size: var(--text-base);
  color: var(--color-gray);
  line-height: 1.7;
}

.about-principles {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.principle {
  position: relative;
  padding-left: var(--space-3xl);
}

.principle-number {
  position: absolute;
  left: 0;
  top: 0;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-frost);
}

.principle-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-sm);
}

.principle-text {
  font-size: var(--text-sm);
  color: var(--color-gray);
  line-height: 1.6;
}

/* --- Services Section --- */
.services {
  padding: var(--space-5xl) 0;
  background: var(--color-ice);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.service-card {
  background: var(--color-white);
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 23, 42, 0.05);
  transition: 
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-ice);
  border-radius: var(--radius-md);
  color: var(--color-frost);
  margin-bottom: var(--space-lg);
}

.service-title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-sm);
}

.service-description {
  font-size: var(--text-sm);
  color: var(--color-gray);
  line-height: 1.6;
}

/* --- Work Section --- */
.work {
  padding: var(--space-5xl) 0;
  background: var(--color-navy);
}

.work .section-label {
  color: var(--color-frost);
}

.work .section-title {
  color: var(--color-white);
}

.work-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3xl);
}

.work-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-4xl);
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-gray-light);
}

.work-testimonial {
  max-width: 600px;
  text-align: center;
}

.testimonial-text {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-style: italic;
  color: var(--color-ice);
  line-height: 1.5;
}

.work-industries {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.industry-tag {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-gray-light);
  border: 1px solid var(--color-gray-dark);
  border-radius: 100px;
  transition: 
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.industry-tag:hover {
  color: var(--color-white);
  border-color: var(--color-gray-light);
}

/* --- Clients Logo Carousel --- */
.clients {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
  overflow: hidden;
  border-top: 1px solid rgba(15, 23, 42, 0.05);
  border-bottom: 1px solid rgba(15, 23, 42, 0.05);
}

.clients-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  mask-image: linear-gradient(
    to right,
    transparent,
    black 10%,
    black 90%,
    transparent
  );
  -webkit-mask-image: linear-gradient(
    to right,
    transparent,
    black 10%,
    black 90%,
    transparent
  );
}

.clients-track {
  display: flex;
  gap: var(--space-4xl);
  width: max-content;
  animation: scroll 40s linear infinite;
}

.clients-track:hover {
  animation-play-state: paused;
}

.client-logo {
  flex-shrink: 0;
  width: 120px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray);
  opacity: 0.6;
  transition: opacity var(--transition-base), color var(--transition-base);
  filter: grayscale(100%);
}

.client-logo:hover {
  opacity: 1;
  color: var(--color-navy);
}

.client-logo svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@keyframes scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* --- Contact Section --- */
.contact {
  padding: var(--space-5xl) 0;
  background: var(--color-white);
}

.contact-wrapper {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.contact-header {
  margin-bottom: var(--space-3xl);
}

.contact-header .section-title {
  max-width: none;
}

.contact-intro {
  font-size: var(--text-lg);
  color: var(--color-gray);
  margin-top: var(--space-md);
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  text-align: left;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group-full {
  grid-column: 1 / -1;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-navy);
}

.form-input {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-base);
  color: var(--color-navy);
  background: var(--color-ice);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: 
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.form-input::placeholder {
  color: var(--color-gray);
}

.form-input:focus {
  outline: none;
  background: var(--color-white);
  border-color: var(--color-frost);
}

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

.contact-alt {
  margin-top: var(--space-2xl);
  font-size: var(--text-sm);
  color: var(--color-gray);
}

.contact-email {
  color: var(--color-frost);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.contact-email:hover {
  color: var(--color-navy);
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0;
  background: var(--color-ice);
  border-top: 1px solid rgba(15, 23, 42, 0.05);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-gray);
  transition: color var(--transition-fast);
}

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

.footer-legal {
  font-size: var(--text-xs);
  color: var(--color-gray);
}

/* --- Animations --- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

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

@keyframes scrollLine {
  0%, 100% {
    transform: scaleY(1);
    transform-origin: top;
  }
  50% {
    transform: scaleY(0.5);
    transform-origin: top;
  }
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: 
    opacity 0.8s var(--transition-smooth),
    transform 0.8s var(--transition-smooth);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Media Queries --- */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }
  
  .hero-visual {
    display: none;
  }
  
  .hero-lottie {
    display: none;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active .nav-toggle-bar:first-child {
    transform: rotate(45deg) translate(3px, 3px);
  }
  
  .nav-toggle.active .nav-toggle-bar:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
  }
  
  .hero {
    min-height: auto;
    padding-top: calc(var(--space-4xl) + 80px);
    padding-bottom: var(--space-3xl);
  }
  
  .hero-scroll {
    display: none;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .work-stats {
    flex-direction: column;
    gap: var(--space-xl);
  }
  
  .contact-form {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: var(--text-2xl);
  }
  
  .hero-title {
    font-size: var(--text-4xl);
  }
  
  .service-card {
    padding: var(--space-xl);
  }
  
  .stat-number {
    font-size: var(--text-3xl);
  }
}

/* --- Print Styles --- */
@media print {
  .nav,
  .hero-scroll,
  .hero-visual {
    display: none;
  }
  
  .hero {
    min-height: auto;
    padding: var(--space-2xl) 0;
  }
  
  section {
    page-break-inside: avoid;
  }
}