/* ============================================================
   Jack Matuszewski — Personal Brand
   Editorial. Warm. Restrained contrast. 4/8px spacing system.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Typography */
  --font-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-serif: "Fraunces", "Times New Roman", Georgia, serif;
  --font-mono:  "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --fs-micro: 0.75rem;
  --fs-body:  1.0625rem;
  --fs-lede:  1.1875rem;
  --fs-title: clamp(1.625rem, 2.6vw, 2.375rem);
  --fs-hero:  clamp(2.5rem, 6vw, 5rem);

  --lh-tight: 1.08;
  --lh-snug:  1.22;
  --lh-prose: 1.6;

  /* Spacing — 4/8 px base */
  --s-1:  0.25rem;   /*  4 */
  --s-2:  0.5rem;    /*  8 */
  --s-3:  0.75rem;   /* 12 */
  --s-4:  1rem;      /* 16 */
  --s-5:  1.5rem;    /* 24 */
  --s-6:  2rem;      /* 32 */
  --s-7:  2.5rem;    /* 40 */
  --s-8:  3rem;      /* 48 */
  --s-10: 4rem;      /* 64 */
  --s-12: 5rem;      /* 80 */
  --s-14: 6rem;      /* 96 */

  /* Layout */
  --max-w:         1040px;
  --pad-x:         clamp(var(--s-5), 5vw, var(--s-10));
  --section-pad:   clamp(var(--s-10), 8vh, 6.5rem);
  --hero-pad-top:  clamp(var(--s-12), 10vh, 7rem);

  /* Accent — muted gold */
  --accent: #b8966c;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Dark theme — warm charcoal, off-white ---------- */
html[data-theme="dark"] {
  --bg:          #17140f;   /* deep warm charcoal, not black */
  --bg-soft:     #1d1914;   /* subtle layer for tonal depth */
  --fg:          #e4ddcf;   /* warm off-white, never #fff */
  --fg-muted:    #9a9388;   /* secondary, still readable */
  --fg-dim:      #6a655b;   /* tertiary, monospace labels */
  --rule:        #2a251d;   /* warm hairline */
  --noise-blend: overlay;
  --noise-op:    0.04;
}

/* ---------- Light theme — warm paper, deep ink ---------- */
html[data-theme="light"] {
  --bg:          #f3efe6;   /* warm cream, not #fff */
  --bg-soft:     #ebe6d8;
  --fg:          #1e1c18;   /* deep ink, not #000 */
  --fg-muted:    #615c52;
  --fg-dim:      #9a948a;
  --rule:        #dcd5c4;
  --noise-blend: multiply;
  --noise-op:    0.035;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* Anchor links account for sticky nav height — section doesn't hide under the bar */
:target, section[id] { scroll-margin-top: 5rem; }

/* Keyboard focus — subtle warm accent ring, matches palette */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
/* Don't double-ring on buttons that already handle state via opacity */
.nav__theme:focus-visible,
.nav__lang:focus-visible {
  outline-offset: 4px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-prose);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.5s var(--ease), color 0.5s var(--ease);
  position: relative;
}

/* Very subtle film grain — kills the "flat digital" look */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/></svg>");
  opacity: var(--noise-op);
  mix-blend-mode: var(--noise-blend);
}

/* Warm top-light halo — tonal variation without a visible gradient */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(1200px 600px at 50% -15%,
    color-mix(in oklab, var(--fg) 3.5%, transparent),
    transparent 65%);
}

main, .nav, .footer { position: relative; z-index: 2; }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
h1, h2, h3, h4, p, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }

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

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-4) var(--pad-x);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: saturate(135%) blur(14px);
  -webkit-backdrop-filter: saturate(135%) blur(14px);
}
.nav__mark {
  font-family: var(--font-sans);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fg);
}
.nav__links {
  display: none;
  gap: var(--s-6);
  font-family: var(--font-sans);
  font-size: var(--fs-micro);
  font-weight: 400;
  letter-spacing: 0.02em;
}
.nav__links a { color: var(--fg-muted); transition: color 0.25s var(--ease); }
.nav__links a:hover { color: var(--fg); }
@media (min-width: 720px) { .nav__links { display: flex; } }

.nav__theme {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--fg-muted);
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.4s var(--ease);
  position: relative;
}
.nav__theme:hover {
  color: var(--fg);
  background: color-mix(in oklab, var(--fg) 6%, transparent);
}
.nav__theme-icon {
  width: 18px; height: 18px;
  position: absolute;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
/* In dark mode: show SUN (the destination if user clicks) */
html[data-theme="dark"] .nav__theme-icon--sun  { opacity: 1; transform: rotate(0) scale(1); }
html[data-theme="dark"] .nav__theme-icon--moon { opacity: 0; transform: rotate(-45deg) scale(0.6); }
/* In light mode: show MOON */
html[data-theme="light"] .nav__theme-icon--sun  { opacity: 0; transform: rotate(45deg) scale(0.6); }
html[data-theme="light"] .nav__theme-icon--moon { opacity: 1; transform: rotate(0) scale(1); }

/* Language toggle + actions cluster */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--s-4);
}
.nav__lang {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-1) 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  line-height: 1;
}
.nav__lang [data-lang] {
  transition: color 0.25s var(--ease);
  color: var(--fg-dim);
}
.nav__lang:hover [data-lang] { color: var(--fg-muted); }
.nav__lang-sep {
  color: var(--fg-dim);
  opacity: 0.45;
}
html[lang="en"] .nav__lang [data-lang="en"],
html[lang="pl"] .nav__lang [data-lang="pl"] {
  color: var(--fg);
}

/* ---------- Section rhythm ---------- */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-pad) var(--pad-x);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--fg-muted);                /* bumped up from --fg-dim for WCAG AA on micro size */
  margin-bottom: var(--s-6);             /* 32 — tighter than before (was 64) */
}
.eyebrow .idx { color: var(--fg-dim); margin-right: var(--s-3); }

.section__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--fs-title);
  line-height: var(--lh-snug);
  letter-spacing: -0.025em;
  max-width: 22ch;
  margin-bottom: var(--s-7);      /* 40 — default when content follows */
}
/* Tighten when a lede follows directly */
.section__title + .section__lede { margin-top: calc(var(--s-7) * -1 + var(--s-4)); }

.section__lede {
  font-size: var(--fs-lede);
  line-height: var(--lh-prose);
  color: var(--fg-muted);
  max-width: 58ch;
  margin-bottom: var(--s-8);       /* 48 */
}

/* ---------- Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Hero ---------- */
.hero {
  padding-top: var(--hero-pad-top);
  position: relative;
  overflow: hidden;              /* crops portrait that extends past padding */
}

.hero__copy {
  position: relative;
  z-index: 2;                    /* always above the portrait */
}

/* Cutout portrait — sits behind the headline like an editorial spot */
.hero__portrait {
  display: none;
  margin: 0;
  position: absolute;
  pointer-events: none;
  z-index: 1;
  /* Hidden on mobile — copy owns the fold */
}
@media (min-width: 860px) {
  .hero__portrait {
    display: block;
    right: clamp(var(--s-4), 3vw, var(--s-8));
    top: clamp(6rem, 12vh, 9rem);
    width: clamp(220px, 24vw, 300px);
    height: auto;
  }
}
@media (min-width: 1200px) {
  .hero__portrait {
    right: clamp(var(--s-6), 4vw, var(--s-10));
    top: clamp(6rem, 11vh, 9rem);
    width: clamp(260px, 24vw, 340px);
  }
}
.hero__portrait img {
  display: block;
  width: 100%;
  height: auto;
  /* Restrained monochrome — warm, but recognizably a photograph */
  filter: grayscale(0.4) contrast(0.95) brightness(0.98) sepia(0.05);
  opacity: 0.75;
  mix-blend-mode: luminosity;
  transition: opacity 0.6s var(--ease), filter 0.6s var(--ease);
  /* Only soften the very bottom edge — no top fade, no funeral vibe */
  -webkit-mask-image: linear-gradient(to bottom, #000 88%, transparent 100%);
          mask-image: linear-gradient(to bottom, #000 88%, transparent 100%);
}
html[data-theme="light"] .hero__portrait img {
  filter: grayscale(0.35) contrast(1) brightness(1.02) sepia(0.03);
  opacity: 0.7;
  mix-blend-mode: multiply;
}
.hero__portrait:hover img { opacity: 0.9; }

.hero__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--fs-hero);
  line-height: var(--lh-tight);
  letter-spacing: -0.035em;
  /* Gentle overlap — text extends past portrait's left edge by a few characters */
  max-width: min(18ch, 72%);
  margin-bottom: var(--s-6);
  position: relative;
  z-index: 2;
}
@media (max-width: 859px) {
  .hero__title { max-width: 18ch; }  /* no portrait on mobile — reclaim full width */
}
.hero__title em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}
.hero__lede {
  font-size: var(--fs-lede);
  line-height: var(--lh-prose);
  color: var(--fg-muted);
  max-width: 58ch;
  margin-bottom: var(--s-8);       /* 48 — down from 64 */
}
.hero__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
.hero__meta span {
  color: var(--fg-dim);
  margin: 0 var(--s-2);
  opacity: 0.5;
}

/* ---------- What I Do ---------- */
.grid {
  display: grid;
  gap: var(--s-8) var(--s-10);     /* 48 vertical, 64 horizontal */
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .grid--four { grid-template-columns: repeat(2, 1fr); } }

.card { padding: 0; }
.card__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.3125rem;
  line-height: var(--lh-snug);
  letter-spacing: -0.015em;
  margin-bottom: var(--s-3);       /* 12 — tightened heading→body */
}
.card__body {
  color: var(--fg-muted);
  font-size: var(--fs-body);
  max-width: 48ch;
}

/* ---------- Principles ---------- */
.principles { display: grid; gap: 0; }
.principle {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: var(--s-6);
  padding: var(--s-7) 0;           /* 40 */
  border-top: 1px solid var(--rule);
}
.principle:last-child { border-bottom: 1px solid var(--rule); }
.principle__num {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  padding-top: var(--s-2);
}
.principle__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.4375rem;
  line-height: var(--lh-snug);
  letter-spacing: -0.02em;
  margin-bottom: var(--s-3);       /* 12 — tightened */
}
.principle__body { color: var(--fg-muted); max-width: 62ch; }

/* ---------- Case studies ---------- */
.case {
  padding: var(--s-8) 0;           /* 48 */
  border-top: 1px solid var(--rule);
}
.case:last-of-type { border-bottom: 1px solid var(--rule); }
.case__head { margin-bottom: var(--s-5); }
.case__kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
  margin-bottom: var(--s-3);
}
.case__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--fs-title);
  line-height: var(--lh-snug);
  letter-spacing: -0.025em;
  max-width: 28ch;
  margin-bottom: var(--s-3);
}
.case__role {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
.case__summary {
  color: var(--fg-muted);
  max-width: 68ch;
  margin-bottom: var(--s-7);       /* 40 — down from 48 */
}

/* borderless metric shelf */
.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-6) var(--s-5);
}
@media (min-width: 820px) { .metrics { grid-template-columns: repeat(4, 1fr); } }
.metric { display: flex; flex-direction: column; gap: var(--s-1); }
.metric__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
.metric__value {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-top: var(--s-1);
}
.metric__delta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  margin-top: var(--s-1);
}

/* ---------- Approach / Phases ---------- */
.phases { display: grid; gap: 0; margin-bottom: var(--s-10); }
.phase {
  display: grid;
  grid-template-columns: 7rem 1fr;
  column-gap: var(--s-6);
  padding: var(--s-7) 0;           /* 40 */
  border-top: 1px solid var(--rule);
}
.phase:last-of-type { border-bottom: 1px solid var(--rule); }
.phase__num {
  grid-column: 1;
  grid-row: 1 / -1;                /* span the full content stack */
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
  padding-top: var(--s-2);
}
.phase__title,
.phase__body,
.phase__meta { grid-column: 2; }   /* all content sits in column 2 */
.phase__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.4375rem;
  line-height: var(--lh-snug);
  letter-spacing: -0.02em;
  margin-bottom: var(--s-3);
}
.phase__body { color: var(--fg-muted); max-width: 58ch; margin-bottom: var(--s-3); }
.phase__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}

@media (max-width: 640px) {
  .phase { grid-template-columns: 1fr; row-gap: var(--s-3); }
  .phase__num,
  .phase__title,
  .phase__body,
  .phase__meta { grid-column: 1; grid-row: auto; }
  .phase__num { padding-top: 0; }
}

.approach__rules { display: grid; gap: var(--s-3); }
.approach__rule {
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  line-height: var(--lh-snug);
  color: var(--fg);
  letter-spacing: -0.01em;
}
.approach__bullet {
  color: var(--fg-dim);
  display: inline-block;
  width: var(--s-6);
}

/* ---------- Contact ---------- */
.contact__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.875rem, 3.6vw, 2.75rem);
  line-height: var(--lh-snug);
  letter-spacing: -0.03em;
  max-width: 26ch;
  margin-bottom: var(--s-5);       /* 24 — tighter to note */
}
.contact__note {
  font-size: var(--fs-body);
  color: var(--fg-muted);
  max-width: 58ch;
  margin-bottom: var(--s-8);       /* 48 — down from 64 */
}
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-5);
  padding-top: var(--s-7);
  border-top: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .contact__grid { grid-template-columns: repeat(3, 1fr); gap: var(--s-8); }
}
.contact__item {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: opacity 0.25s var(--ease);
}
.contact__item:not(.contact__item--static):hover { opacity: 0.65; }
.contact__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
.contact__value {
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  color: var(--fg);
  letter-spacing: -0.01em;
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--s-7) var(--pad-x) var(--s-6);
  text-align: left;
  max-width: var(--max-w);
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--fg-dim);
  letter-spacing: 0.02em;
  border-top: 1px solid var(--rule);
}

/* ---------- Responsive tightening ---------- */
@media (max-width: 640px) {
  :root {
    --section-pad:  var(--s-10);   /* 64px on mobile */
    --hero-pad-top: var(--s-10);
  }
  .section__title + .section__lede { margin-top: calc(var(--s-6) * -1 + var(--s-4)); }
}