/* =============================================================
   Tokens — clean-dark-web-design (Adri-Fluid inspired, dark)
   ============================================================= */
:root {
  /* Surfaces */
  --bg: #0E0E0F;
  --bg-elev-1: #151517;
  --bg-elev-2: #1C1C1F;

  /* Text */
  --text: #ECEAE4;
  --text-muted: #A6A39B;
  --text-subtle: #6E6B64;

  /* Lines */
  --line: rgba(236, 234, 228, 0.08);
  --line-strong: rgba(236, 234, 228, 0.16);

  /* Accent */
  --accent: #D8C9A8;
  --accent-ink: #0E0E0F;

  /* Focus */
  --focus: #8FB8FF;

  /* Typography */
  --font-sans: 'DM Sans', system-ui, -apple-system, 'Segoe UI', 'Noto Sans KR', sans-serif;
  --fs-display: clamp(3rem, 6vw + 1rem, 6rem);
  --fs-h2:      clamp(2.25rem, 3vw + 1rem, 3.5rem);
  --fs-h3:      clamp(1.5rem, 1.2vw + 1rem, 2rem);
  --fs-body:    1.0625rem;
  --fs-small:   0.9375rem;
  --fs-eyebrow: 0.8125rem;
  --lh-tight: 1.05;
  --lh-snug:  1.2;
  --lh-body:  1.6;
  --tracking-eyebrow: 0.16em;

  /* Layout */
  --container: 1240px;
  --gutter: clamp(1.25rem, 2vw, 2rem);
  --space-section: clamp(5rem, 10vw, 10rem);
  --space-block:   clamp(2rem, 4vw, 4rem);
  --radius: 14px;
  --radius-lg: 22px;

  /* Motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* =============================================================
   Reset / base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }

::selection { background: var(--accent); color: var(--accent-ink); }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
}
h1 { font-size: var(--fs-display); line-height: var(--lh-tight); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-h2);      line-height: var(--lh-snug); }
h3 { font-size: var(--fs-h3);      line-height: var(--lh-snug); }
p  { margin: 0; max-width: 65ch; }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--text-subtle);
  margin: 0 0 1.5rem;
}

.italic-accent {
  font-style: italic;
  font-weight: 300;
  color: var(--text);
}

.lede {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 56ch;
}

/* =============================================================
   Layout primitives
   ============================================================= */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main > section {
  padding-block: var(--space-section);
  border-top: 1px solid var(--line);
}
main > section:first-of-type { border-top: 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
}

/* =============================================================
   Buttons & links
   ============================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .9rem 1.5rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: transform .18s var(--ease), opacity .18s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); opacity: .92; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line-strong);
}
.btn-ghost:hover { border-color: var(--text); }

.link-inline {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 5px;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  transition: text-decoration-color .15s var(--ease);
}
.link-inline:hover { text-decoration-color: var(--text); }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  margin-top: 2rem;
}

/* =============================================================
   Header (sticky, transparent over hero)
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem var(--gutter);
  transition: background-color .25s var(--ease), border-color .25s var(--ease), backdrop-filter .25s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header[data-scrolled="true"] {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
}
.site-header .wordmark {
  font-weight: 500;
  letter-spacing: 0.18em;
  font-size: 0.875rem;
}
.site-header nav {
  display: flex;
  gap: 1.75rem;
}
.site-header nav a {
  font-size: var(--fs-small);
  color: var(--text-muted);
  transition: color .15s var(--ease);
}
.site-header nav a:hover { color: var(--text); }

@media (max-width: 540px) {
  .site-header nav { gap: 1rem; }
  .site-header nav a { font-size: 0.8125rem; }
}

/* =============================================================
   Hero
   ============================================================= */
.hero {
  padding-block: clamp(6rem, 12vw, 12rem) var(--space-section);
}
.hero-inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
}
.hero h1 {
  grid-column: 1 / span 11;
  max-width: 18ch;
}
.hero .lede {
  grid-column: 1 / span 7;
  margin-top: 1.75rem;
}
.hero .cta-row { grid-column: 1 / -1; }

@media (max-width: 820px) {
  .hero h1, .hero .lede { grid-column: 1 / -1; }
}

/* =============================================================
   Stats
   ============================================================= */
.stats-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  list-style: none;
  margin: 0;
  padding: 0;
}
.stats-list li {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.stat-value {
  font-size: var(--fs-h2);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-caption {
  color: var(--text-muted);
  font-size: var(--fs-small);
}

@media (max-width: 700px) {
  .stats-list { grid-template-columns: 1fr; }
}

/* =============================================================
   Approach (value cards)
   ============================================================= */
.approach-head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
  margin-bottom: var(--space-block);
}
.approach-head .eyebrow { grid-column: 1 / span 12; margin-bottom: .75rem; }
.approach-head h2 { grid-column: 1 / span 8; max-width: 22ch; }

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 1.5vw, 1.5rem);
}
.value-card {
  background: var(--bg-elev-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}
.value-card:hover {
  background: var(--bg-elev-2);
  border-color: var(--line-strong);
}
.value-card h3 { font-size: 1.375rem; }
.value-card p { color: var(--text-muted); }

@media (max-width: 900px) {
  .values-grid { grid-template-columns: 1fr; }
  .approach-head h2 { grid-column: 1 / -1; }
}

/* =============================================================
   Work — asymmetric case studies
   ============================================================= */
.work-head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
  margin-bottom: var(--space-block);
}
.work-head .eyebrow { grid-column: 1 / span 12; margin-bottom: .75rem; }
.work-head h2 { grid-column: 1 / span 8; max-width: 22ch; }

.work-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
}
.project {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  text-decoration: none;
  color: var(--text);
}
.project[data-size="large"] { grid-column: 1 / span 12; }
.project[data-size="small"] { grid-column: span 6; }

.project-cover {
  position: relative;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
  background: var(--cover-gradient, linear-gradient(135deg, #2a241a 0%, #14110d 100%));
  transition: border-color .25s var(--ease);
}
.project[data-size="large"] .project-cover { aspect-ratio: 16 / 9; }

.project-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  transform: scale(1);
  transition: transform .7s var(--ease), opacity .4s var(--ease);
}

.project-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 55%, rgba(0,0,0,0.45) 100%);
  pointer-events: none;
  z-index: 1;
}

.project:hover .project-cover { border-color: var(--line-strong); }
.project:hover .project-cover img { transform: scale(1.04); }

.project-mark {
  position: absolute;
  inset: auto auto 1.25rem 1.25rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  z-index: 2;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.4);
}

.project-meta {
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--text-subtle);
}
.project-name { font-size: 1.5rem; font-weight: 500; }
.project-blurb { color: var(--text-muted); max-width: 52ch; }

/* Tone-driven gradients (kept within palette) */
.project[data-tone="warm"]    { --cover-gradient: linear-gradient(135deg, #2f261a 0%, #14110d 70%, #0f0d0a 100%); }
.project[data-tone="neutral"] { --cover-gradient: linear-gradient(135deg, #232325 0%, #16161a 70%, #0f0f12 100%); }
.project[data-tone="cool"]    { --cover-gradient: linear-gradient(135deg, #1d2327 0%, #131618 70%, #0d1011 100%); }

@media (max-width: 820px) {
  .project[data-size="small"] { grid-column: 1 / -1; }
  .work-head h2 { grid-column: 1 / -1; }
}

/* =============================================================
   Philosophy
   ============================================================= */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(2rem, 3vw, 3rem);
  align-items: start;
}
.philosophy-grid .eyebrow { grid-column: 1 / span 12; margin-bottom: 0; }
.philosophy-quote {
  grid-column: 1 / span 8;
  font-size: clamp(1.75rem, 2.4vw + 1rem, 2.75rem);
  line-height: 1.25;
  font-style: italic;
  font-weight: 300;
  letter-spacing: -0.005em;
  max-width: 24ch;
}
.philosophy-quote::before {
  content: "“";
  display: block;
  font-size: 2em;
  line-height: 0.8;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.principles-list {
  grid-column: 9 / span 4;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.principle {
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.principle h3 {
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: 0;
  margin-bottom: .5rem;
}
.principle p { color: var(--text-muted); font-size: var(--fs-small); max-width: 30ch; }

@media (max-width: 900px) {
  .philosophy-quote, .principles-list { grid-column: 1 / -1; }
}

/* =============================================================
   Contact CTA
   ============================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 2vw, 2.5rem);
  align-items: end;
}
.contact-grid .eyebrow { grid-column: 1 / span 12; margin-bottom: .25rem; }
.contact-headline {
  grid-column: 1 / span 8;
  max-width: 14ch;
}
.contact-body {
  grid-column: 1 / span 7;
  margin-top: 1.5rem;
  color: var(--text-muted);
}
.contact-grid .cta-row { grid-column: 1 / -1; margin-top: 2.25rem; }

@media (max-width: 820px) {
  .contact-headline, .contact-body { grid-column: 1 / -1; }
}

/* =============================================================
   Footer
   ============================================================= */
.site-footer {
  border-top: 1px solid var(--line);
  padding: var(--space-block) var(--gutter);
}
.site-footer .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: end;
  padding-inline: 0;
}
.site-footer .wordmark {
  font-weight: 500;
  letter-spacing: 0.18em;
  font-size: 0.875rem;
  display: block;
  margin-bottom: .5rem;
}
.site-footer .tagline { color: var(--text-muted); font-size: var(--fs-small); }
.site-footer .copyright { color: var(--text-subtle); font-size: 0.8125rem; }
.footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: var(--fs-small);
  color: var(--text-muted);
}
.footer-links a:hover { color: var(--text); }

@media (max-width: 640px) {
  .site-footer .container { grid-template-columns: 1fr; }
}

/* =============================================================
   Reveal-on-scroll (driven by IntersectionObserver in JS)
   ============================================================= */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  will-change: transform, opacity;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* =============================================================
   Reduced motion
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}