/*
  bystanek.com — global stylesheet
  Built on the Bystanek Design System. "Grounded, quiet, ordered."
  Tokens are the single source of truth; never hardcode hex values in markup.
*/

@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:wght@400;600&family=Inter:wght@400;500&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  /* ---- Color: roles (light mode default) ---- */
  --color-bg: #F2EDE1;            /* Stone */
  --color-surface: #E8E1D2;      /* Stone Dim */
  --color-text: #2B3B34;         /* Forest */
  --color-text-muted: #3F5C57;   /* Mountain */
  --color-accent: #3E6B74;       /* Sea */
  --color-accent-fill: #A9C7CC;  /* Sky */
  --color-alert: #C0602A;        /* Ember */
  --color-border: var(--color-text-muted);

  /* ---- Typography ---- */
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-sans: "Inter", "Helvetica Neue", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;

  --text-xs: 0.8rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5625rem;
  --text-2xl: 1.9375rem;
  --text-3xl: 2.4375rem;
  --text-4xl: 3.0625rem;

  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;

  /* ---- Spacing (8px base unit) ---- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  /* ---- Layout ---- */
  --max-width-reading: 720px;
  --max-width-app: 1120px;

  /* ---- Shape ---- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-none: 0px;
  --border-width: 1px;

  /* ---- Elevation (use sparingly) ---- */
  --shadow-sm: 0 1px 3px rgba(26, 33, 28, 0.08);
  --shadow-md: 0 4px 12px rgba(26, 33, 28, 0.10);

  /* ---- Motion ---- */
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 350ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Dark mode: system preference ---- */
@media (prefers-color-scheme: dark) {
  :root:not(.light) {
    --color-bg: #1A211C;          /* Forest Black */
    --color-surface: #232B25;     /* Forest Dim */
    --color-text: #E8E3D6;        /* Stone */
    --color-text-muted: #9CAE9F;  /* Mountain Light */
    --color-accent: #8FBAC9;      /* Sea Bright */
    --color-accent-fill: #2C4652; /* Sky Deep */
    --color-alert: #E07B45;       /* Ember Bright */

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
  }
}

/* ---- Dark mode: manual override ---- */
html.dark {
  --color-bg: #1A211C;
  --color-surface: #232B25;
  --color-text: #E8E3D6;
  --color-text-muted: #9CAE9F;
  --color-accent: #8FBAC9;
  --color-accent-fill: #2C4652;
  --color-alert: #E07B45;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
}

/* ---- Deep dark: darker variant (background drops below Forest Black) ---- */
html.dark-deep {
  --color-bg: #0E120F;          /* Forest Black Deep */
  --color-surface: #1A211C;     /* old Forest Black steps up to surface */
  --color-text: #E8E3D6;
  --color-text-muted: #9CAE9F;
  --color-accent: #8FBAC9;
  --color-accent-fill: #2C4652;
  --color-alert: #E07B45;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.55);
}

/* ---- Reset / base ---- */
*,
*::before,
*::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text);
  margin: 0;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0; }

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

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

/* ---- Layout ---- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-8) var(--space-4);
}

@media (max-width: 640px) {
  .page { padding: var(--space-6) var(--space-4); }
}

.container {
  width: 100%;
  max-width: var(--max-width-reading);
  margin: 0 auto;
}

/* ---- Header / wordmark ---- */
.masthead {
  text-align: center;
  margin-bottom: var(--space-6);
}

.wordmark {
  font-family: var(--font-serif);
  font-weight: var(--weight-semibold);
  font-size: var(--text-4xl);
  letter-spacing: -0.01em;
  margin: 0;
}

.tagline {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: var(--space-2);
}

/* ---- Ornament: single centered rule per section ---- */
.rule {
  border: 0;
  border-top: var(--border-width) solid var(--color-border);
  width: 48px;
  margin: var(--space-5) auto;
  opacity: 0.6;
}

/* ---- Bio ---- */
.bio {
  text-align: center;
  color: var(--color-text);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  max-width: 56ch;
  margin: 0 auto var(--space-6);
}

.bio p + p { margin-top: var(--space-3); }

/* ---- Link list (linktree) ---- */
.links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  color: var(--color-text);
  transition: background var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}

.link-card:hover {
  background: var(--color-accent-fill);
  border-color: var(--color-accent);
  text-decoration: none;
}

.link-card__body { min-width: 0; }

.link-card__title {
  font-family: var(--font-serif);
  font-weight: var(--weight-semibold);
  font-size: var(--text-xl);
  margin: 0;
}

.link-card__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.link-card__arrow {
  flex-shrink: 0;
  color: var(--color-accent);
  transition: transform var(--duration-base) var(--ease-out);
}

.link-card:hover .link-card__arrow {
  transform: translateX(4px);
}

/* ---- Tags ---- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0;
}

.tag {
  background: var(--color-accent-fill);
  color: var(--color-text);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-weight: var(--weight-medium);
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-5);
  border: var(--border-width) solid transparent;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  filter: brightness(0.92);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-accent-fill);
  text-decoration: none;
}

/* ---- Project page ---- */
.project {
  width: 100%;
  max-width: var(--max-width-reading);
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
}

.back-link:hover { color: var(--color-accent); }

.project__header { margin-bottom: var(--space-5); }

.project__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
}

.project__lead {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.project__body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.project__body p + p { margin-top: var(--space-4); }

.project__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* ---- Project groups (base / mobile) ---- */
.group + .group { margin-top: var(--space-5); }

.group__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-align: center;
  margin: 0 0 var(--space-3);
}

/* ---- Contact ---- */
.contact {
  margin-top: var(--space-7);
  text-align: center;
}

.contact__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.contact__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact__item {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-3);
}

.contact__label {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  min-width: 10ch;
  text-align: right;
}

.contact__link { font-family: var(--font-mono); font-size: var(--text-sm); }

/* ---- Footer ---- */
.footer {
  margin-top: var(--space-8);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer a { color: var(--color-text-muted); }
.footer a:hover { color: var(--color-accent); }

.social {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-2);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.social a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.footer__legacy { margin-bottom: var(--space-3); }
.footer__legacy a { text-decoration: underline; text-underline-offset: 2px; }
.footer__mark { margin: 0; }

/* ---- Icons (thin-stroke line, 1.5px) ---- */
.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ==================================================================
   DESKTOP — editorial split (≥ 900px)
   A fixed identity rail on the left, a scrolling project index on the
   right. Mobile keeps the centered column above; nothing below the
   breakpoint is affected. No HTML changes: .container becomes a
   contents box so the homepage children drop straight into the grid.
   ================================================================== */
@media (min-width: 900px) {

  /* ---- Homepage grid ----
     Two columns. The left rail is a sub-grid of three rows so the
     masthead, bio, and footer stack without overlapping: wordmark at
     top, bio below it, footer pinned to the bottom. The right column
     spans all three rows and centers the index. */
  body:has(#project-nav) .page {
    display: grid;
    grid-template-columns: minmax(340px, 5fr) minmax(0, 7fr);
    grid-template-rows: auto auto 1fr auto;
    grid-template-areas:
      "mast     index"
      "bio      index"
      "contact  index"
      "foot     index";
    max-width: 1280px;
    margin: 0 auto;
    padding: 0;
    min-height: 100vh;
  }

  body:has(#project-nav) .container { display: contents; }

  /* The centered ornament rules are mobile-only dividers. */
  body:has(#project-nav) .rule { display: none; }

  /* Rail column gets a right hairline via a pseudo-spanning border on
     each cell's shared left edge of the index instead — simpler: put
     the divider on the index side. */

  /* Masthead — top of rail */
  body:has(#project-nav) .masthead {
    grid-area: mast;
    text-align: left;
    margin: 0;
    padding: var(--space-8) var(--space-7) 0;
  }
  body:has(#project-nav) .wordmark {
    font-size: clamp(3.0625rem, 5vw, 4.25rem);
    line-height: 0.95;
  }
  body:has(#project-nav) .masthead .tagline {
    margin-top: var(--space-3);
    font-size: var(--text-base);
  }

  /* Bio — middle of rail, sits directly under the wordmark */
  body:has(#project-nav) .bio {
    grid-area: bio;
    align-self: start;
    text-align: left;
    max-width: 40ch;
    margin: 0;
    padding: var(--space-5) var(--space-7) 0;
    font-size: var(--text-base);
    color: var(--color-text-muted);
  }

  /* Contact — rail, under bio */
  body:has(#project-nav) .contact {
    grid-area: contact;
    align-self: start;
    text-align: left;
    margin: 0;
    padding: var(--space-6) var(--space-7) 0;
  }
  body:has(#project-nav) .contact__title {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
  }
  body:has(#project-nav) .contact__item {
    justify-content: flex-start;
  }
  body:has(#project-nav) .contact__label {
    min-width: 12ch;
    text-align: left;
  }

  /* Footer — pinned to rail bottom */
  body:has(#project-nav) .footer {
    grid-area: foot;
    align-self: end;
    text-align: left;
    margin: 0;
    padding: var(--space-6) var(--space-7);
  }
  body:has(#project-nav) .social { justify-content: flex-start; }

  /* ---- Right: project index (spans all rail rows) ---- */
  body:has(#project-nav) nav[aria-label="Projects"] {
    grid-area: index;
    align-self: center;
    padding: var(--space-8) var(--space-7);
    width: 100%;
    border-left: var(--border-width) solid var(--color-border);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    counter-reset: idx;               /* numbering runs across all groups */
  }

  /* Group: a small mono heading over its rows. */
  body:has(#project-nav) .group + .group { margin-top: var(--space-6); }

  body:has(#project-nav) .group__title {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin: 0 0 var(--space-2);
  }

  body:has(#project-nav) .links {
    gap: 0;
    border-top: var(--border-width) solid var(--color-border);
  }

  /* Rows, not floating cards: full-width, hairline-separated. */
  body:has(#project-nav) .link-card {
    background: transparent;
    border: 0;
    border-bottom: var(--border-width) solid var(--color-border);
    border-radius: 0;
    padding: var(--space-5) var(--space-3);
    align-items: baseline;
    justify-content: flex-start;
    counter-increment: idx;
    position: relative;
  }

  /* Body takes the remaining width; arrow is pushed to the far right. */
  body:has(#project-nav) .link-card__body { flex: 1; }

  body:has(#project-nav) .link-card::before {
    content: counter(idx, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    width: 3ch;
    flex-shrink: 0;
    padding-top: 0.5em;
  }

  body:has(#project-nav) .link-card:hover {
    background: transparent;
    border-color: var(--color-border);
    padding-left: var(--space-5);
  }

  body:has(#project-nav) .link-card__title {
    font-size: var(--text-2xl);
    transition: color var(--duration-base) var(--ease-out);
  }

  body:has(#project-nav) .link-card:hover .link-card__title {
    color: var(--color-accent);
  }

  body:has(#project-nav) .link-card__desc {
    font-size: var(--text-base);
    margin-top: var(--space-2);
    max-width: 52ch;
  }

  body:has(#project-nav) .link-card__arrow {
    width: 28px;
    height: 28px;
    align-self: center;
  }

  /* ---- Project detail page: shift off dead-center ---- */
  body:has(.project) .page {
    align-items: flex-start;
    justify-content: center;
    flex-direction: row;
    padding: var(--space-8) var(--space-7);
  }

  .project {
    max-width: 760px;
    margin: 0;
  }

  .project__title { font-size: clamp(2.4375rem, 4vw, 3.5rem); }
}

/* Wide desktop: let the rail breathe more. */
@media (min-width: 1280px) {
  body:has(#project-nav) .masthead { padding-left: var(--space-8); }
  body:has(#project-nav) .bio { padding-left: var(--space-8); }
  body:has(#project-nav) .contact { padding-left: var(--space-8); }
  body:has(#project-nav) .footer { padding-left: var(--space-8); }
}