/* ========================================
   CSS Variables & Reset
   ======================================== */

:root {
  /* Colors */
  --color-background: #0f1418;
  --color-surface: #1b2024;
  --color-surface-high: #252b2e;
  --color-surface-highest: #303539;
  --color-surface-dim: #0a0f12;
  
  --color-primary: #8ed5ff;
  --color-primary-container: #38bdf8;
  --color-on-primary: #00354a;
  
  --color-secondary: #b9c8de;
  --color-secondary-container: #39485a;
  
  --color-tertiary: #ffc176;
  --color-tertiary-container: #f1a02b;
  
  --color-text: #dee3e8;
  --color-text-variant: #bdc8d1;
  --color-text-dim: #87929a;
  
  --color-border: #3e484f;
  --color-border-variant: #303539;
  
  --color-error: #ffb4ab;
  --color-error-container: #93000a;
  
  /* Typography */
  --font-display: "Geist", system-ui, -apple-system, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-gutter: 1.5rem;
  
  /* Border Radius */
  --radius-sm: 0.125rem;
  --radius-md: 0.25rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-standard: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Max Width */
  --max-width-container: 1280px;
  
  /* Z-Index */
  --z-header: 50;
  --z-modal: 100;
}

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

html {
  scroll-behavior: smooth;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 4rem);
  letter-spacing: -0.02em;
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
}

h3 {
  font-size: 1.5rem;
  font-weight: 500;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
}

p {
  color: var(--color-text-variant);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #7bd0ff;
}

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

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: all var(--transition-standard);
  user-select: none;
}

.btn:active {
  transform: scale(0.95);
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: 0 0 20px rgba(142, 213, 255, 0.3);
}

.btn--primary:hover {
  background-color: #7bd0ff;
  box-shadow: 0 0 30px rgba(142, 213, 255, 0.5);
}

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

.btn--secondary:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.btn--small {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

.btn--full {
  width: 100%;
}

/* ========================================
   Glass Effect
   ======================================== */

.glass {
  background: rgba(30, 41, 59, 0.4);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(51, 65, 85, 0.5);
  border-radius: var(--radius-lg);
}

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

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background-color: rgba(15, 20, 24, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-variant);
  transition: all var(--transition-standard);
}

.header.scrolled {
  padding-top: var(--spacing-xs);
  padding-bottom: var(--spacing-xs);
  background-color: rgba(15, 20, 24, 0.95);
}

.header__container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.header__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  flex-shrink: 0;
}

.header__nav {
  display: none;
  gap: var(--spacing-lg);
  flex: 1;
}

@media (min-width: 768px) {
  .header__nav {
    display: flex;
  }
}

.header__link {
  font-size: 0.875rem;
  color: var(--color-text-variant);
  transition: color var(--transition-fast);
}

.header__link:hover {
  color: var(--color-text);
}

/* ========================================
   Main Layout
   ======================================== */

main {
  margin-top: 80px;
}

/* ========================================
   Section Styles
   ======================================== */

section {
  scroll-margin-top: 100px;
}

.section__title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--color-text);
  font-weight: 600;
}

.section__title--center {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section__underline {
  width: 80px;
  height: 4px;
  background-color: var(--color-primary);
  margin: var(--spacing-sm) auto var(--spacing-lg);
}

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

.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-gutter);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 56rem;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-surface-high);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

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

.hero__description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-variant);
  margin-bottom: var(--spacing-lg);
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

@media (min-width: 640px) {
  .hero__cta {
    flex-direction: row;
  }
}

.hero__decoration {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.4;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-10px);
  }
}

/* ========================================
   About Section
   ======================================== */

.about {
  padding: var(--spacing-xl) var(--spacing-gutter);
  background-color: var(--color-surface-dim);
}

.about__container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

@media (min-width: 768px) {
  .about__container {
    grid-template-columns: 1fr 1fr;
  }
}

.about__image {
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
}

.about__content {
  padding-left: var(--spacing-md);
}

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

/* ========================================
   Services Section
   ======================================== */

.services {
  padding: var(--spacing-xl) var(--spacing-gutter);
  max-width: var(--max-width-container);
  margin: 0 auto;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-top: 2px solid var(--color-primary);
  background: var(--color-surface-high);
  border: 1px solid var(--color-border);
  border-top: 2px solid var(--color-primary);
  transition: all var(--transition-standard);
  cursor: pointer;
}

.service-card:hover {
  transform: translateY(-4px);
  background-color: var(--color-surface-highest);
  box-shadow: 0 4px 12px rgba(142, 213, 255, 0.1);
}

.service-card__icon {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.service-card__title {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.service-card__description {
  font-size: 0.9rem;
  color: var(--color-text-variant);
  line-height: 1.6;
}

/* ========================================
   Tech Stack Section
   ======================================== */

.tech-stack {
  background-color: var(--color-surface-dim);
  padding: var(--spacing-xl) var(--spacing-gutter);
  text-align: center;
}

.tech-stack__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
}

.tech-stack__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  opacity: 0.7;
}

.tech-stack__item {
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid rgba(51, 65, 85, 0.5);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text);
  backdrop-filter: blur(12px);
}

/* ========================================
   Process Section
   ======================================== */

.process {
  padding: var(--spacing-xl) var(--spacing-gutter);
  max-width: var(--max-width-container);
  margin: 0 auto;
}

.process__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.process__step {
  text-align: center;
}

.process__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-surface-high);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 auto var(--spacing-sm);
  font-size: 1rem;
}

.process__number--active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
  box-shadow: 0 0 20px rgba(142, 213, 255, 0.3);
}

.process__step-title {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.process__step-description {
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

/* ========================================
   Portfolio Section
   ======================================== */

.portfolio {
  padding: var(--spacing-xl) var(--spacing-gutter);
  background-color: var(--color-surface-dim);
}

.portfolio__empty {
  max-width: 500px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  text-align: center;
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid rgba(51, 65, 85, 0.5);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.portfolio__icon {
  font-size: 3rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  display: block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.portfolio__title {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.portfolio__description {
  color: var(--color-text-variant);
  font-size: 0.9rem;
}

/* ========================================
   Pricing Section
   ======================================== */

.pricing {
  padding: var(--spacing-xl) var(--spacing-gutter);
  max-width: var(--max-width-container);
  margin: 0 auto;
}

.pricing__card {
  max-width: 400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  border-radius: calc(var(--radius-lg) * 2);
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid rgba(51, 65, 85, 0.5);
  border-top: 4px solid var(--color-primary);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.pricing__icon {
  font-size: 4rem;
  color: var(--color-primary);
  opacity: 0.05;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 0;
}

.pricing__title {
  position: relative;
  z-index: 1;
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.pricing__subtitle {
  position: relative;
  z-index: 1;
  color: var(--color-text-variant);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.pricing__price {
  position: relative;
  z-index: 1;
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
}

.pricing__features {
  position: relative;
  z-index: 1;
  list-style: none;
  margin-bottom: var(--spacing-xl);
  space-y: var(--spacing-sm);
}

.pricing__feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.pricing__feature .material-symbols-outlined {
  color: var(--color-primary);
  font-size: 1.25rem;
  flex-shrink: 0;
}

/* ========================================
   CTA Section
   ======================================== */

.cta {
  padding: var(--spacing-xl) var(--spacing-gutter);
  max-width: 56rem;
  margin: 0 auto;
  text-align: center;
  position: relative;
}

.cta::before,
.cta::after {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.1;
  pointer-events: none;
}

.cta::before {
  background-color: var(--color-primary);
  top: -100px;
  right: -100px;
}

.cta::after {
  background-color: var(--color-tertiary);
  bottom: -100px;
  left: -100px;
}

.cta__title {
  position: relative;
  z-index: 1;
  margin-bottom: var(--spacing-md);
}

.cta__description {
  position: relative;
  z-index: 1;
  font-size: 1.125rem;
  color: var(--color-text-variant);
  margin-bottom: var(--spacing-lg);
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.cta__email {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.cta__email:hover {
  text-decoration: underline;
  text-decoration-offset: 8px;
}

.cta__note {
  position: relative;
  z-index: 1;
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

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

.footer {
  border-top: 1px solid var(--color-border-variant);
  background-color: var(--color-surface-dim);
  padding: var(--spacing-xl) var(--spacing-gutter);
}

.footer__container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-lg);
  align-items: center;
}

@media (max-width: 768px) {
  .footer__container {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.footer__copyright {
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

@media (max-width: 768px) {
  .footer__nav {
    justify-content: center;
  }
}

.footer__link {
  font-size: 0.875rem;
  color: var(--color-text-variant);
  opacity: 0.8;
  transition: all var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary);
  opacity: 1;
}

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

@media (max-width: 640px) {
  :root {
    --spacing-gutter: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 2.5rem;
  }

  main {
    margin-top: 70px;
  }

  section {
    scroll-margin-top: 80px;
  }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: more) {
  body {
    --color-text-variant: #d4d9de;
    --color-text-dim: #a0a6ad;
  }
}