/* =============================================================
   Dwa Kolory — Website UI Kit · structural styles
   Pairs with ../../colors_and_type.css (tokens + type classes).
   ============================================================= */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
button { font-family: inherit; }
::selection { background: var(--accent); color: #fff; }

.container { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }
.eyebrow {
  font-family: var(--font-mono); font-size: var(--eyebrow-size);
  letter-spacing: var(--eyebrow-ls); font-weight: 500;
  text-transform: uppercase; color: var(--fg-muted);
}
.mono { font-family: var(--font-mono); font-size: 13px; letter-spacing: .01em; color: var(--fg-muted); }
.muted { color: var(--fg-muted); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-size: 15px; font-weight: 500; letter-spacing: -.01em;
  padding: 12px 20px; border-radius: var(--radius); border: 1px solid transparent;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur-fast) var(--ease);
}
.btn .ic { width: 17px; height: 17px; }
.btn-primary { background: var(--ink); color: var(--fg-on-accent); }
.btn-primary:hover { background: var(--ink-hover); }
.btn-secondary { background: transparent; color: var(--fg); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--fg); }
.btn-ghost { background: transparent; color: var(--fg-secondary); padding-inline: 8px; }
.btn-ghost:hover { color: var(--fg); }
.btn:active { transform: translateY(1px); }
.btn-lg { padding: 15px 26px; font-size: 16px; }

/* arrow link */
.alink {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--fg); text-decoration: none; font-weight: 500; font-size: 15px;
  transition: gap var(--dur) var(--ease), color var(--dur) var(--ease);
}
.alink .ic { width: 16px; height: 16px; transition: transform var(--dur) var(--ease); }
.alink:hover { color: var(--accent); }
.alink:hover .ic { transform: translateX(3px); }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; cursor: pointer; user-select: none; }
.brand img { width: 26px; height: 26px; }
.brand .wm { font-size: 18px; font-weight: 500; letter-spacing: -.02em; color: var(--fg); }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
  font-size: 14px; font-weight: 450; color: var(--fg-secondary);
  text-decoration: none; padding: 8px 12px; border-radius: var(--radius);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-link:hover { color: var(--fg); background: var(--bg-muted); }
.nav-link.active { color: var(--fg); }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius); border: 1px solid var(--border);
  background: transparent; color: var(--fg-secondary); cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { background: var(--bg-muted); color: var(--fg); }
.icon-btn .ic { width: 18px; height: 18px; }

/* ---- Hero ---- */
.hero { padding-top: clamp(64px, 11vw, 150px); padding-bottom: clamp(48px, 8vw, 110px); }
.hero h1 { max-width: 16ch; margin: 22px 0 0; }
.hero .lede { max-width: 46ch; margin: 28px 0 0; }
.hero-cta { display: flex; gap: 14px; margin-top: 40px; flex-wrap: wrap; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 28px; margin-top: clamp(56px, 9vw, 110px);
  padding-top: 22px; border-top: 1px solid var(--border);
}
.hero-meta .item { display: flex; flex-direction: column; gap: 6px; }
.hero-meta .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-subtle); }
.hero-meta .v { font-size: 15px; color: var(--fg); }

/* ---- Section scaffolding ---- */
.section { padding-block: clamp(64px, 10vw, 130px); }
.section.alt { background: var(--bg-subtle); }
.section.invert { background: var(--ink); color: var(--fg-on-accent); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: clamp(36px, 5vw, 60px); }
.section-head h2 { margin: 12px 0 0; }
.section-head .eyebrow { display: block; }

/* ---- Work bento ---- */
.work-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.proj { grid-column: span 2; display: flex; flex-direction: column; cursor: pointer; text-decoration: none; color: inherit; }
.proj.lg { grid-column: span 4; }
.proj.wide { grid-column: span 6; }
.proj .media {
  position: relative; width: 100%; background: var(--bg-muted);
  border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden;
  transition: border-color var(--dur) var(--ease);
  display: flex; align-items: flex-end; padding: 18px;
}
.proj .media .idx { position: absolute; top: 14px; right: 16px; font-family: var(--font-mono); font-size: 12px; color: var(--fg-subtle); }
.proj .media .ghost { font-size: clamp(28px, 4vw, 52px); font-weight: 600; letter-spacing: -.03em; color: color-mix(in srgb, var(--fg) 9%, transparent); }
.proj.h-tall .media { aspect-ratio: 4 / 3.4; }
.proj.h-med .media { aspect-ratio: 4 / 3; }
.proj.h-short .media { aspect-ratio: 16 / 6; }
.proj:hover .media { border-color: var(--fg); }
.proj .foot { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-top: 16px; }
.proj .foot .t { font-size: 18px; font-weight: 600; letter-spacing: -.02em; }
.proj .foot .m { font-family: var(--font-mono); font-size: 12px; color: var(--fg-muted); }
.proj .foot .arr { color: var(--fg-subtle); transition: color var(--dur) var(--ease), transform var(--dur) var(--ease); }
.proj:hover .foot .arr { color: var(--accent); transform: translate(2px,-2px); }

/* ---- Approach (numbered rows) ---- */
.rows { border-top: 1px solid var(--border); }
.rowi { display: grid; grid-template-columns: 80px 1fr 1.3fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--border); align-items: start; transition: background var(--dur) var(--ease); }
.rowi:hover { background: color-mix(in srgb, var(--fg) 2.5%, transparent); }
.rowi .num { font-family: var(--font-mono); font-size: 13px; color: var(--fg-subtle); padding-top: 4px; }
.rowi .rt { font-size: 22px; font-weight: 600; letter-spacing: -.02em; }
.rowi .rd { color: var(--fg-muted); font-size: 16px; line-height: 1.6; max-width: 52ch; }

/* ---- About split ---- */
.split { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 6vw, 88px); align-items: center; }
.cap-list { list-style: none; margin: 26px 0 0; padding: 0; border-top: 1px solid var(--border); }
.cap-list li { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border); font-size: 15px; }
.cap-list li .s { color: var(--fg-muted); font-family: var(--font-mono); font-size: 12px; }
.portrait { aspect-ratio: 4/5; background: var(--bg-muted); border: 1px solid var(--border); border-radius: var(--radius-md); }

/* ---- Contact CTA (invert) ---- */
.cta-inner { text-align: left; }
.cta-inner h2 { max-width: 18ch; margin: 16px 0 0; }
.cta-inner .eyebrow { color: color-mix(in srgb, #fff 55%, transparent); }
.cta-inner .btn-primary { background: #fff; color: #111; margin-top: 36px; }
.cta-inner .btn-primary:hover { background: #e8e8e6; }

/* ---- Footer ---- */
.footer { border-top: 1px solid var(--border); padding-block: 56px 40px; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--fg-subtle); margin: 0 0 16px; font-weight: 500; }
.footer .fcol a { display: block; color: var(--fg-secondary); text-decoration: none; font-size: 15px; padding: 5px 0; transition: color var(--dur) var(--ease); }
.footer .fcol a:hover { color: var(--accent); }
.footer .fbrand .wm { font-size: 18px; font-weight: 500; letter-spacing: -.02em; }
.footer .fbrand p { color: var(--fg-muted); font-size: 15px; line-height: 1.6; max-width: 34ch; margin: 14px 0 0; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--border); }
.footer-bottom .mono { font-size: 12px; }

/* ---- Case study ---- */
.cs { padding-top: 40px; }
.cs .back { margin-bottom: 40px; }
.cs h1 { max-width: 18ch; margin: 18px 0 0; }
.cs .cs-meta { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 44px; padding: 24px 0; border-block: 1px solid var(--border); }
.cs .cs-meta .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-subtle); }
.cs .cs-meta .v { font-size: 15px; color: var(--fg); margin-top: 8px; }
.cs .cs-hero { aspect-ratio: 16/8; background: var(--bg-muted); border: 1px solid var(--border); border-radius: var(--radius-md); margin-top: 40px; display:flex; align-items:flex-end; padding: 28px; }
.cs .cs-hero .ghost { font-size: clamp(36px, 6vw, 84px); font-weight: 600; letter-spacing: -.03em; color: color-mix(in srgb, var(--fg) 8%, transparent); }
.cs .cs-body { max-width: 68ch; margin: 56px 0 0; }
.cs .cs-body p { font-size: 19px; line-height: 1.7; color: var(--fg-secondary); margin: 0 0 24px; }
.cs .cs-body h3 { margin: 44px 0 14px; }
.cs .duo { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 40px; }
.cs .duo .ph { aspect-ratio: 4/3; background: var(--bg-muted); border: 1px solid var(--border); border-radius: var(--radius-md); }
.cs .next { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--border); }
.cs .next .t { font-size: clamp(22px, 3vw, 34px); font-weight: 600; letter-spacing: -.025em; }

/* ---- responsive ---- */
@media (max-width: 880px) {
  .nav-links .nav-link { display: none; }
  .work-grid { grid-template-columns: repeat(2, 1fr); }
  .proj, .proj.lg, .proj.wide { grid-column: span 2; }
  .split { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .rowi { grid-template-columns: 48px 1fr; }
  .rowi .rd { grid-column: 2; }
  .cs .cs-meta { grid-template-columns: 1fr 1fr; }
}