/* ============================================
   DESIGN SYSTEM & VARIABLES
   ============================================ */

:root {
  /* Colors – Light */
  --color-bg: #FAFAFA;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #888888;
  --color-divider: #E6E6E6;
  --color-btn-border: #1A1A1A;
  --color-btn-bg-hover: #1A1A1A;
  --color-btn-text-hover: #FFFFFF;
  --color-surface: #FFFFFF;
  --color-nav-bg: rgba(250, 250, 250, 0.9);
  --color-placeholder-text: rgba(255,255,255,0.4);

  /* Typography */
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Inter', -apple-system, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;

  /* Grid */
  --grid-max: 1280px;
  --grid-padding: 3rem;

  /* Divider */
  --divider-width: 0.5px;
}

[data-theme="dark"] {
  --color-bg: #0F0F0F;
  --color-text-primary: #E8E8E8;
  --color-text-secondary: #777777;
  --color-divider: #2A2A2A;
  --color-btn-border: #E8E8E8;
  --color-btn-bg-hover: #E8E8E8;
  --color-btn-text-hover: #0F0F0F;
  --color-surface: #171717;
  --color-nav-bg: rgba(15, 15, 15, 0.9);
  --color-placeholder-text: rgba(255,255,255,0.15);
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  transition: background-color 0.4s ease, color 0.4s ease;
}

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

ul {
  list-style: none;
}

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

/* ============================================
   DIVIDER
   ============================================ */

.divider {
  width: 100%;
  height: var(--divider-width);
  background-color: var(--color-divider);
}

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

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: var(--divider-width) solid var(--color-divider);
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.nav__inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 var(--grid-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  transition: color 0.4s ease;
}

.nav__links {
  display: flex;
  gap: var(--space-md);
}

.nav__link {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color 0.3s ease;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: var(--divider-width);
  background-color: var(--color-text-primary);
  transition: width 0.3s ease;
}

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

.nav__link:hover::after {
  width: 100%;
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 60px;
}

.hero__inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 var(--grid-padding);
  width: 100%;
}

.hero__name-wrapper {
  position: relative;
  margin-bottom: var(--space-lg);
}

.hero__name {
  font-family: var(--font-serif);
  font-size: clamp(5rem, 14vw, 12rem);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  overflow: hidden;
  transition: color 0.4s ease;
}

.hero__letter {
  display: inline-block;
  opacity: 0;
  transform: translateY(100%);
  animation: letterReveal 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: calc(0.08s * var(--i) + 0.3s);
}

@keyframes letterReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__line {
  position: absolute;
  bottom: -1rem;
  left: 0;
  width: 0;
  height: var(--divider-width);
  background-color: var(--color-divider);
  animation: lineExpand 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: 0.9s;
}

@keyframes lineExpand {
  to {
    width: 100%;
  }
}

.hero__content {
  opacity: 0;
  animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: 1.2s;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(1.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__tagline {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-style: italic;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  transition: color 0.4s ease;
}

.hero__cta {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.3s ease;
}

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

.hero__arrow {
  transition: transform 0.3s ease;
  display: inline-block;
}

.hero__cta:hover .hero__arrow {
  transform: translateX(4px);
}

/* ============================================
   CRAFT SECTION
   ============================================ */

.craft {
  padding: var(--space-xl) 0;
}

.craft__inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 var(--grid-padding);
}

.section-title {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  transition: color 0.4s ease;
}

/* Project Layout */
.project {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  align-items: start;
}

.project:last-child {
  margin-bottom: 0;
}

.project--right {
  grid-template-columns: 1fr 2fr;
}

/* Project Image */
.project__image-placeholder {
  width: 100%;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.project__image-placeholder:hover {
  transform: scale(1.02);
}

.project__image-label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-placeholder-text);
}

/* Project Content */
.project__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-md) 0;
  height: 100%;
}

.project__divider-top,
.project__divider-bottom {
  width: 100%;
  height: var(--divider-width);
  background-color: var(--color-divider);
  transition: background-color 0.4s ease;
}

.project__divider-top {
  margin-bottom: var(--space-md);
}

.project__divider-bottom {
  margin-top: var(--space-md);
}

.project__client {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  display: block;
  transition: color 0.4s ease;
}

.project__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  transition: color 0.3s ease;
}

.project__description {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  transition: color 0.4s ease;
}

.project__keywords {
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.4s ease;
}

.project__keyword-sep {
  color: var(--color-divider);
  font-weight: 300;
}

/* Project Button */
.project__btn {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 1.75rem;
  border: var(--divider-width) solid var(--color-btn-border);
  background: transparent;
  color: var(--color-text-primary);
  display: inline-block;
  width: fit-content;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.project__btn:hover {
  background-color: var(--color-btn-bg-hover);
  color: var(--color-btn-text-hover);
  border-color: var(--color-btn-bg-hover);
}

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

.footer {
  padding: var(--space-xl) 0 var(--space-md);
  border-top: var(--divider-width) solid var(--color-divider);
  transition: border-color 0.4s ease;
}

.footer__inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 var(--grid-padding);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.footer__col {
  padding-right: var(--space-md);
  border-right: var(--divider-width) solid var(--color-divider);
  transition: border-color 0.4s ease;
}

.footer__col:last-child {
  border-right: none;
  padding-right: 0;
}

.footer__name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  display: block;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
  transition: color 0.4s ease;
}

.footer__role {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  display: block;
  transition: color 0.4s ease;
}

.footer__heading {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  display: block;
  margin-bottom: var(--space-sm);
  transition: color 0.4s ease;
}

.footer__list li {
  margin-bottom: 0.5rem;
}

.footer__list a {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 300;
  color: var(--color-text-primary);
  transition: color 0.3s ease;
}

.footer__list a:hover {
  color: var(--color-text-secondary);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border: var(--divider-width) solid var(--color-btn-border);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  color: var(--color-text-primary);
}

.theme-toggle:hover {
  background-color: var(--color-btn-bg-hover);
  color: var(--color-btn-text-hover);
  border-color: var(--color-btn-bg-hover);
}

[data-theme="light"] .theme-toggle__icon--moon {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--sun {
  display: none;
}

.footer__personal {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--color-text-secondary);
  font-style: italic;
  transition: color 0.4s ease;
}

/* Footer Bottom */
.footer__bottom {
  max-width: var(--grid-max);
  margin: var(--space-lg) auto 0;
  padding: 0 var(--grid-padding);
}

.footer__bottom .divider {
  margin-bottom: var(--space-md);
}

.footer__copy {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 300;
  color: var(--color-text-secondary);
  transition: color 0.4s ease;
}

/* ============================================
   SCROLL REVEAL ANIMATION
   ============================================ */

.project {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.project.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 900px) {
  :root {
    --grid-padding: 1.5rem;
  }

  .project {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .project--right {
    grid-template-columns: 1fr;
  }

  .project--right .project__content {
    order: 2;
  }

  .project--right .project__image {
    order: 1;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .footer__col {
    border-right: none;
    padding-right: 0;
    padding-bottom: var(--space-md);
    border-bottom: var(--divider-width) solid var(--color-divider);
  }

  .footer__col:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
}

@media (max-width: 600px) {
  .hero__name {
    font-size: clamp(3.5rem, 18vw, 6rem);
  }

  .footer__inner {
    grid-template-columns: 1fr;
  }
}