/* =========================================================================
   doand.tech — Data Tools Index
   Concept (DSGN-1): public data read like an instrument panel — a quiet,
   precise index. NOT cream+serif+terracotta, NOT near-black+acid-green,
   NOT a newspaper hairline pastiche.

   Tokens live in :root + prefers-color-scheme: dark (DSGN-2).
   Category accent arrives ONLY via inline --card-accent / --chip-accent
   (data-driven, ARCH-1). No category hex is hard-coded here; CSS holds a
   neutral fallback only.
   ========================================================================= */

:root {
  /* --- cool paper + ink palette (light) ---------------------------------
     Slightly blue-cool paper (not warm cream) to read as a measured,
     technical surface rather than an editorial / AI-default look. */
  --paper:        #eef1f5;   /* page ground: cool paper */
  --surface:      #ffffff;   /* raised card surface */
  --surface-sunk: #e6eaf0;   /* inset wells: stat strip */
  --ink:          #161a21;   /* primary text: near-ink, not pure black */
  --ink-soft:     #434b58;   /* secondary text */
  --ink-faint:    #6b7480;   /* tertiary / meta */
  --line:         #d2d8e1;   /* hairline borders */
  --line-strong:  #aeb7c4;

  /* Neutral accent fallback ONLY. Real accent is injected per-card from
     category.accent via inline --card-accent (DSGN-2). */
  --accent-fallback: #4a5568;
  --card-accent: var(--accent-fallback);
  --chip-accent: var(--accent-fallback);

  /* tint of the live accent, used for soft fills without alpha guesswork */
  --accent-wash: color-mix(in srgb, var(--card-accent) 12%, var(--surface));
  --accent-line: color-mix(in srgb, var(--card-accent) 38%, var(--line));

  /* --- type (DSGN-3) ----------------------------------------------------- */
  --font-display: "Zen Kaku Gothic New", system-ui, sans-serif;
  --font-body:    system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN",
                  "Hiragino Sans", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas,
                  "Liberation Mono", monospace;

  /* --- scale ------------------------------------------------------------- */
  --maxw: 1120px;
  --gap:  clamp(0.875rem, 0.6rem + 1.4vw, 1.25rem);
  --radius: 4px;             /* small radii: instrument, not bubbly */
  --shadow: 0 1px 2px rgba(20, 26, 36, 0.06),
            0 6px 18px rgba(20, 26, 36, 0.06);
  --shadow-lift: 0 2px 4px rgba(20, 26, 36, 0.08),
                 0 14px 36px rgba(20, 26, 36, 0.12);

  --speed: 180ms;
  --ease:  cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #0e1116;   /* deep cool slate, not pure black (avoids the
                                  black+acid-green default) */
    --surface:      #171b22;
    --surface-sunk: #11151b;
    --ink:          #e7ebf1;
    --ink-soft:     #aab3c0;
    --ink-faint:    #79828f;
    --line:         #272d37;
    --line-strong:  #3a414d;
    --accent-fallback: #8c97a8;
    --accent-wash: color-mix(in srgb, var(--card-accent) 18%, var(--surface));
    --accent-line: color-mix(in srgb, var(--card-accent) 50%, var(--line));
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 18px rgba(0, 0, 0, 0.35);
    --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.5), 0 16px 40px rgba(0, 0, 0, 0.5);
  }
}

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

/* The `hidden` attribute must always win. JS filtering/search toggles cards
   via `el.hidden = true`; author `display` rules (e.g. `.card { display:flex }`)
   otherwise override the UA `[hidden]{display:none}` and leave hidden cards
   visible. This keeps progressive-enhancement filtering correct (CODE-5). */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  /* faint vertical "ruled" texture: the page reads like graph paper / a
     measuring surface without resorting to a newspaper hairline grid */
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px);
  background-size: 100% 4.5rem;
  background-position: 0 -1px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

:where(h1, h2, h3, p, dl, dd, ul) { margin: 0; }

ul { padding: 0; list-style: none; }

/* Visible focus for keyboard users (DSGN-7) */
:focus-visible {
  outline: 2px solid var(--card-accent, var(--accent-fallback));
  outline-offset: 2px;
  border-radius: 2px;
}

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.1) blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.75rem clamp(1rem, 4vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.site-header__brand-mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  /* a small monospace "device label" mark, in keeping with the instrument
     theme; the leading marker is a measuring tick, not a logo image */
}
.site-header__brand-mark::before {
  content: "▖";
  color: var(--ink-faint);
  margin-right: 0.4ch;
}

.site-header__nav-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.35rem 0.2rem;
}
.site-header__nav-link:hover { color: var(--ink); }

/* =========================================================================
   Main / layout shell
   ========================================================================= */
.main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) 4rem;
}

/* =========================================================================
   Hero — text-only LCP (DSGN-6)
   ========================================================================= */
.hero { padding: clamp(1.5rem, 5vw, 3.5rem) 0 clamp(1rem, 3vw, 2rem); }

.hero__inner { max-width: 46rem; }

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  color: var(--ink-faint);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}
.hero__eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 1.2rem + 3.4vw, 3.1rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.hero__description {
  margin-top: 1rem;
  font-size: clamp(0.95rem, 0.9rem + 0.3vw, 1.0625rem);
  color: var(--ink-soft);
  max-width: 40rem;
}

.hero__meta {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

/* =========================================================================
   Filters — chips + search
   ========================================================================= */
.filters {
  position: sticky;
  top: 3.25rem;
  z-index: 40;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin: clamp(1rem, 3vw, 2rem) 0 1.5rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: saturate(1.1) blur(6px);
}

.filters__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-chip {
  --chip-accent: var(--accent-fallback);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;       /* the only pill in the design: a control knob */
  padding: 0.38rem 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  transition: color var(--speed) var(--ease),
              border-color var(--speed) var(--ease),
              background var(--speed) var(--ease);
}
/* category swatch dot, colored from the data-driven --chip-accent */
.filter-chip[style*="--chip-accent"]::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--chip-accent);
  flex: none;
}
.filter-chip:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}
.filter-chip.is-active {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--chip-accent) 60%, var(--line-strong));
  background: color-mix(in srgb, var(--chip-accent) 14%, var(--surface));
}

.filters__search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filters__search-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.filters__search-input {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.42rem 0.7rem;
  min-width: min(15rem, 60vw);
  transition: border-color var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
}
.filters__search-input::placeholder { color: var(--ink-faint); }
.filters__search-input:focus {
  outline: none;
  border-color: var(--accent-fallback);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-fallback) 22%, transparent);
}

/* =========================================================================
   Grid (DSGN-8)
   ========================================================================= */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--gap);
}

@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr; }
}

.grid__empty {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink-faint);
  text-align: center;
  padding: 2.5rem 1rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
}
.grid__empty[hidden] { display: none; }

/* =========================================================================
   Card — the signature surface (DSGN-4, DSGN-5)
   No thumbnails. The boldness is concentrated in (1) the monospace stat
   strip and (2) the top accent bar that wipes in from the left on hover /
   focus-within via scaleX.
   ========================================================================= */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease),
              border-color var(--speed) var(--ease);
}

/* (DSGN-4) top accent bar — a pseudo-element so no markup change is needed.
   Sits above the card, scales in from the left edge. Color is the
   data-driven --card-accent. */
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--card-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--speed) var(--ease);
  z-index: 3;
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
  border-color: var(--accent-line);
}
.card:hover::before,
.card:focus-within::before {
  transform: scaleX(1);
}

/* Stretched link covering the whole card -> external tool url (DSGN-7) */
.card__cover {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* Card content sits above the cover so text is selectable and the detail
   link can be raised above it. */
.card__body {
  position: relative;
  z-index: 2;
  pointer-events: none;          /* let clicks fall through to the cover... */
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.15rem 1.2rem 1.25rem;
  flex: 1;
}
.card__body :where(a, button) { pointer-events: auto; } /* ...except real controls */

.card__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: none;
  padding-right: 5rem;            /* keep clear of the status pill */
}

.card__status {
  position: absolute;
  top: 1.1rem;
  right: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  background: var(--surface-sunk);
}
.card__status[data-status="live"] {
  color: #1f7a4d;
  border-color: color-mix(in srgb, #1f7a4d 45%, var(--line));
  background: color-mix(in srgb, #1f7a4d 12%, var(--surface));
}
.card__status[data-status="beta"] {
  color: #9a6a13;
  border-color: color-mix(in srgb, #9a6a13 45%, var(--line));
  background: color-mix(in srgb, #9a6a13 12%, var(--surface));
}
.card__status[data-status="dev"] {
  color: var(--ink-faint);
}
@media (prefers-color-scheme: dark) {
  .card__status[data-status="live"] { color: #4cc98a; }
  .card__status[data-status="beta"] { color: #d6a23a; }
}

.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--ink);
  margin-top: 0.1rem;
}

.card__tagline {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* --- monospace stat strip (DSGN-4 signature) --------------------------- */
.card__stats {
  display: flex;
  flex-wrap: wrap;
  margin-top: 0.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-sunk);
  overflow: hidden;
}

.card__stat {
  flex: 1 1 0;
  min-width: 6.5rem;
  padding: 0.55rem 0.7rem;
  border-left: 1px solid var(--line);
}
.card__stat:first-child { border-left: 0; }

.card__stat-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card__stat-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  margin-top: 0.12rem;
  /* tabular figures read like a gauge */
  font-variant-numeric: tabular-nums;
}

/* --- tags -------------------------------------------------------------- */
.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--line);
  border-radius: 3px;
}
.card__tag::before { content: "#"; color: var(--ink-faint); }

/* --- CTA + detail link ------------------------------------------------- */
.card__cta {
  margin-top: auto;
  padding-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--card-accent);
  letter-spacing: 0.02em;
}

/* secondary link (-> /site/<slug>/) raised above the cover (DSGN-7) */
.card__detail {
  position: absolute;
  z-index: 2;
  bottom: 1.25rem;
  right: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  text-decoration: none;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
  transition: color var(--speed) var(--ease),
              border-color var(--speed) var(--ease);
}
.card__detail:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

/* =========================================================================
   Detail page (site.php)
   ========================================================================= */
.detail { position: relative; }

.detail__inner {
  max-width: 46rem;
  padding-top: clamp(1rem, 3vw, 2rem);
  border-top: 3px solid var(--card-accent);
}

.detail__crumbs {
  display: flex;
  align-items: center;
  gap: 0.5ch;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin-bottom: 1.5rem;
}
.detail__crumb { text-decoration: none; color: var(--ink-faint); }
.detail__crumb[href]:hover { color: var(--ink); }
.detail__crumb.is-current { color: var(--ink-soft); }

.detail__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.detail__status {
  display: inline-block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  background: var(--surface-sunk);
}
.detail__status[data-status="live"] {
  color: #1f7a4d;
  border-color: color-mix(in srgb, #1f7a4d 45%, var(--line));
  background: color-mix(in srgb, #1f7a4d 12%, var(--surface));
}

.detail__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 1.2rem + 2.2vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: 0.7rem;
}

.detail__tagline {
  font-size: 1.0625rem;
  color: var(--ink-soft);
  margin-top: 0.6rem;
}

.detail__description {
  margin-top: 1.6rem;
  color: var(--ink);
  line-height: 1.8;
}

.detail__stats {
  display: flex;
  flex-wrap: wrap;
  margin-top: 1.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-sunk);
  overflow: hidden;
}
.detail__stat {
  flex: 1 1 0;
  min-width: 8rem;
  padding: 0.85rem 1rem;
  border-left: 1px solid var(--line);
}
.detail__stat:first-child { border-left: 0; }
.detail__stat-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.detail__stat-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--ink);
  margin-top: 0.2rem;
  font-variant-numeric: tabular-nums;
}

.detail__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.4rem;
}
.detail__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 3px;
}
.detail__tag::before { content: "#"; color: var(--ink-faint); }

.detail__actions { margin-top: 2.2rem; }

.detail__open {
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--surface);
  background: var(--card-accent);
  text-decoration: none;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--card-accent) 70%, #000);
  transition: transform var(--speed) var(--ease),
              box-shadow var(--speed) var(--ease);
}
.detail__open:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lift);
}

/* =========================================================================
   404
   ========================================================================= */
.notfound { padding: clamp(3rem, 10vw, 6rem) 0; text-align: center; }
.notfound__inner { max-width: 32rem; margin: 0 auto; }
.notfound__code {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 500;
  color: var(--line-strong);
  line-height: 1;
}
.notfound__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--ink);
  margin-top: 0.5rem;
}
.notfound__text { color: var(--ink-soft); margin-top: 0.8rem; }
.notfound__home {
  display: inline-block;
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink);
  text-decoration: none;
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.notfound__home:hover { border-color: var(--ink-soft); }

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 80%, var(--surface));
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem clamp(1rem, 4vw, 2rem);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}
.site-footer__lead { color: var(--ink-soft); font-size: 0.95rem; }
.site-footer__copy {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

/* =========================================================================
   Reduced motion (DSGN-7) — disable transitions & the scaleX bar animation.
   The accent bar still appears on hover, just without the wipe.
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  .card:hover,
  .card:focus-within { transform: none; }
  .card::before { transform-origin: left center; }
}