/* ==========================================================================
   BillTrack Theme — main stylesheet
   Design language: editorial precision. Variable serif display + geometric
   sans body + monospaced numerals. Hairline rules, asymmetric grid,
   single-accent vermillion. Light/dark via prefers-color-scheme + manual
   override on <html data-theme="light|dark">.
   ========================================================================== */

@layer reset, tokens, base, layout, components, utilities, blocks;

/* --------------------------------------------------------------------------
   Reset (modern, minimal)
   -------------------------------------------------------------------------- */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
  body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
  ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
  img, picture, video, svg { display: block; max-width: 100%; height: auto; }
  input, button, textarea, select { font: inherit; color: inherit; }
  button { background: none; border: 0; padding: 0; cursor: pointer; }
  a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
}

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */
@layer tokens {
  :root {
    /* paper palette */
    --bt-paper:        #F5F1EA;
    --bt-paper-2:      #EDE7DC;
    --bt-surface:      #FFFEFB;

    /* ink */
    --bt-ink:          #131318;
    --bt-ink-soft:     #2A2A30;
    --bt-muted:        #6E6E78;
    --bt-rule:         color-mix(in srgb, var(--bt-ink) 12%, transparent);
    --bt-rule-strong:  color-mix(in srgb, var(--bt-ink) 22%, transparent);

    /* accent — vermillion (wax-stamp red) */
    --bt-accent:       #E94B3C;
    --bt-accent-deep:  #B5392B;
    --bt-accent-soft:  color-mix(in srgb, var(--bt-accent) 12%, transparent);

    /* states */
    --bt-good:         #2F7D5F;
    --bt-warn:         #B5811E;

    /* type families */
    --bt-font-display: "Fraunces", Georgia, "Times New Roman", serif;
    --bt-font-body:    "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --bt-font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

    /* fluid scale */
    --fs-xs:   clamp(0.75rem, 0.72rem + 0.1vw, 0.8125rem);
    --fs-sm:   clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
    --fs-md:   1.0625rem;
    --fs-lg:   clamp(1.125rem, 1.05rem + 0.4vw, 1.25rem);
    --fs-xl:   clamp(1.375rem, 1.2rem + 0.8vw, 1.625rem);
    --fs-2xl:  clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
    --fs-3xl:  clamp(2.25rem, 1.7rem + 2.4vw, 3.5rem);
    --fs-4xl:  clamp(3rem, 2rem + 4.4vw, 5.75rem);
    --fs-5xl:  clamp(3.5rem, 2rem + 6.5vw, 7.5rem);

    /* spacing scale */
    --sp-1: 0.25rem;
    --sp-2: 0.5rem;
    --sp-3: 0.75rem;
    --sp-4: 1rem;
    --sp-5: 1.5rem;
    --sp-6: 2rem;
    --sp-7: 3rem;
    --sp-8: 4rem;
    --sp-9: 6rem;
    --sp-10: 8rem;

    /* layout */
    --bt-shell:        min(1280px, 100% - 2.5rem);
    --bt-shell-narrow: min(820px,  100% - 2.5rem);
    --bt-radius:       3px;
    --bt-radius-lg:    8px;

    /* motion */
    --bt-ease:         cubic-bezier(0.2, 0.65, 0.3, 1);
    --bt-dur:          240ms;

    /* paper grain — base64 SVG noise overlay */
    --bt-grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.04 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  }

  /* dark theme — flip paper ↔ ink */
  @media (prefers-color-scheme: dark) {
    :root {
      --bt-paper:        #131318;
      --bt-paper-2:      #1B1B22;
      --bt-surface:      #1F1F27;
      --bt-ink:          #F5F1EA;
      --bt-ink-soft:     #D6D2CB;
      --bt-muted:        #989099;
      --bt-rule:         color-mix(in srgb, var(--bt-ink) 14%, transparent);
      --bt-rule-strong:  color-mix(in srgb, var(--bt-ink) 28%, transparent);
      --bt-accent:       #FF6A56;
      --bt-accent-deep:  #FF8E7C;
      --bt-accent-soft:  color-mix(in srgb, var(--bt-accent) 16%, transparent);
    }
  }

  /* manual override (set by theme-toggle JS) */
  html[data-theme="light"] {
    color-scheme: light;
    --bt-paper:        #F5F1EA;
    --bt-paper-2:      #EDE7DC;
    --bt-surface:      #FFFEFB;
    --bt-ink:          #131318;
    --bt-ink-soft:     #2A2A30;
    --bt-muted:        #6E6E78;
    --bt-rule:         color-mix(in srgb, var(--bt-ink) 12%, transparent);
    --bt-rule-strong:  color-mix(in srgb, var(--bt-ink) 22%, transparent);
    --bt-accent:       #E94B3C;
    --bt-accent-deep:  #B5392B;
    --bt-accent-soft:  color-mix(in srgb, var(--bt-accent) 12%, transparent);
  }
  html[data-theme="dark"] {
    color-scheme: dark;
    --bt-paper:        #131318;
    --bt-paper-2:      #1B1B22;
    --bt-surface:      #1F1F27;
    --bt-ink:          #F5F1EA;
    --bt-ink-soft:     #D6D2CB;
    --bt-muted:        #989099;
    --bt-rule:         color-mix(in srgb, var(--bt-ink) 14%, transparent);
    --bt-rule-strong:  color-mix(in srgb, var(--bt-ink) 28%, transparent);
    --bt-accent:       #FF6A56;
    --bt-accent-deep:  #FF8E7C;
    --bt-accent-soft:  color-mix(in srgb, var(--bt-accent) 16%, transparent);
  }
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */
@layer base {
  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "kern", "liga", "calt";
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
  }

  body {
    background-color: var(--bt-paper);
    background-image: var(--bt-grain);
    color: var(--bt-ink);
    font-family: var(--bt-font-body);
    font-size: var(--fs-md);
    line-height: 1.65;
    font-feature-settings: "kern", "liga", "ss01";
    overflow-x: hidden;
  }

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

  /* Headings — Fraunces with optical sizing */
  h1, h2, h3, h4, h5, h6 {
    font-family: var(--bt-font-display);
    font-weight: 500;
    font-optical-sizing: auto;
    font-variation-settings: "SOFT" 30, "WONK" 0;
    line-height: 1.1;
    letter-spacing: -0.015em;
    color: var(--bt-ink);
    text-wrap: balance;
  }
  h1 { font-size: var(--fs-4xl); line-height: 0.98; letter-spacing: -0.025em; }
  h2 { font-size: var(--fs-3xl); }
  h3 { font-size: var(--fs-2xl); }
  h4 { font-size: var(--fs-xl); font-family: var(--bt-font-body); font-weight: 600; letter-spacing: -0.005em; }
  h5 { font-size: var(--fs-lg); font-family: var(--bt-font-body); font-weight: 600; }
  h6 { font-size: var(--fs-md); font-family: var(--bt-font-body); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }

  p { text-wrap: pretty; }
  p + p { margin-top: 1em; }

  a {
    color: var(--bt-ink);
    text-decoration: underline;
    text-decoration-color: var(--bt-rule-strong);
    transition: color var(--bt-dur) var(--bt-ease), text-decoration-color var(--bt-dur) var(--bt-ease);
  }
  a:hover { color: var(--bt-accent); text-decoration-color: var(--bt-accent); }

  /* Tabular numerals — important for billing copy */
  .num, time, .stats *, dd, .meta {
    font-feature-settings: "tnum", "lnum";
    font-variant-numeric: tabular-nums lining-nums;
  }

  hr {
    border: 0;
    border-top: 1px solid var(--bt-rule);
    margin-block: var(--sp-7);
  }

  blockquote {
    font-family: var(--bt-font-display);
    font-size: var(--fs-xl);
    font-style: italic;
    font-weight: 400;
    line-height: 1.4;
    border-inline-start: 2px solid var(--bt-accent);
    padding-inline-start: var(--sp-5);
    margin-block: var(--sp-6);
    color: var(--bt-ink-soft);
  }
  blockquote cite {
    display: block;
    margin-top: var(--sp-3);
    font-family: var(--bt-font-body);
    font-size: var(--fs-sm);
    font-style: normal;
    color: var(--bt-muted);
  }

  code, kbd, samp, pre {
    font-family: var(--bt-font-mono);
    font-size: 0.9em;
  }
  code {
    background: var(--bt-paper-2);
    padding: 0.1em 0.35em;
    border-radius: var(--bt-radius);
    border: 1px solid var(--bt-rule);
  }
  pre {
    background: var(--bt-paper-2);
    border: 1px solid var(--bt-rule);
    border-radius: var(--bt-radius-lg);
    padding: var(--sp-5);
    overflow-x: auto;
    line-height: 1.55;
  }
  pre code { background: none; padding: 0; border: 0; }

  /* Form controls */
  input[type="text"],
  input[type="email"],
  input[type="url"],
  input[type="search"],
  input[type="number"],
  input[type="tel"],
  input[type="password"],
  textarea,
  select {
    width: 100%;
    background: var(--bt-surface);
    color: var(--bt-ink);
    border: 1px solid var(--bt-rule-strong);
    border-radius: var(--bt-radius);
    padding: 0.7em 0.9em;
    transition: border-color var(--bt-dur) var(--bt-ease), box-shadow var(--bt-dur) var(--bt-ease);
  }
  input:focus, textarea:focus, select:focus {
    outline: 0;
    border-color: var(--bt-accent);
    box-shadow: 0 0 0 3px var(--bt-accent-soft);
  }

  /* Focus visible — ink ring, accessible */
  :focus-visible {
    outline: 2px solid var(--bt-accent);
    outline-offset: 3px;
    border-radius: 2px;
  }

  /* Skip link */
  .skip-link {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -120%);
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: 0.6rem 1rem;
    border-radius: 0 0 var(--bt-radius) var(--bt-radius);
    font-size: var(--fs-sm);
    text-decoration: none;
    z-index: 1000;
    transition: transform var(--bt-dur) var(--bt-ease);
  }
  .skip-link:focus { transform: translate(-50%, 0); }

  .screen-reader-text {
    position: absolute !important;
    clip: rect(1px, 1px, 1px, 1px);
    width: 1px; height: 1px;
    overflow: hidden;
    word-wrap: normal !important;
  }
  .screen-reader-text:focus {
    background-color: var(--bt-paper);
    clip: auto !important;
    color: var(--bt-ink);
    display: block;
    font-size: 1em;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
  }
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
@layer layout {
  .shell { width: var(--bt-shell); margin-inline: auto; }
  .shell--narrow { width: var(--bt-shell-narrow); margin-inline: auto; }

  .site-main { min-height: 60vh; }

  .section {
    padding-block: clamp(var(--sp-7), 5vw, var(--sp-9));
    border-top: 1px solid var(--bt-rule);
  }
  .section:first-of-type { border-top: 0; }

  .section__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-3);
    margin-bottom: var(--sp-7);
  }
  @media (min-width: 720px) {
    .section__head { grid-template-columns: 1fr 2fr; gap: var(--sp-6); align-items: end; }
  }
  .section__eyebrow {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--bt-muted);
    margin: 0;
  }
  .section__eyebrow::before {
    content: "§ ";
    color: var(--bt-accent);
    margin-right: 0.4ch;
  }
  .section__title {
    font-size: var(--fs-3xl);
    margin: 0;
    max-width: 22ch;
  }
  .section__intro {
    color: var(--bt-ink-soft);
    font-size: var(--fs-lg);
    max-width: 56ch;
    margin: 0;
  }
}

/* --------------------------------------------------------------------------
   Components
   -------------------------------------------------------------------------- */
@layer components {

  /* === Site header === */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bt-paper) 88%, transparent);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--bt-rule);
  }
  .site-header__inner {
    width: var(--bt-shell);
    margin-inline: auto;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--sp-5);
    padding-block: 1rem;
  }
  .site-branding { display: flex; align-items: center; gap: 0.7rem; }
  .site-title {
    font-family: var(--bt-font-display);
    font-size: 1.375rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--bt-ink);
    letter-spacing: -0.01em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }
  .site-title:hover { color: var(--bt-ink); }
  .site-title__mark {
    color: var(--bt-accent);
    font-size: 1.1em;
    line-height: 0;
    transform: translateY(-0.05em);
  }
  .site-description {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    color: var(--bt-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin: 0;
    border-inline-start: 1px solid var(--bt-rule-strong);
    padding-inline-start: 0.7rem;
  }
  @media (max-width: 720px) {
    .site-description { display: none; }
  }
  .custom-logo-link img,
  .site-branding .custom-logo { max-height: 36px; width: auto; }

  /* primary nav */
  .site-nav { justify-self: end; }
  .site-nav__menu {
    list-style: none;
    margin: 0; padding: 0;
    display: flex;
    gap: var(--sp-5);
    align-items: center;
  }
  .site-nav__menu a {
    text-decoration: none;
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--bt-ink-soft);
    position: relative;
    padding-block: 0.4rem;
  }
  .site-nav__menu a:hover { color: var(--bt-accent); }
  .site-nav__menu a[aria-current="page"] { color: var(--bt-ink); }
  .site-nav__menu a[aria-current="page"]::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: 0;
    border-bottom: 2px solid var(--bt-accent);
  }
  .site-nav__menu .menu-item-has-children > a::after {
    content: " ↓"; opacity: 0.5;
  }

  /* mobile nav toggle */
  .site-nav__toggle {
    display: none;
    width: 40px; height: 40px;
    border: 1px solid var(--bt-rule-strong);
    border-radius: var(--bt-radius);
    background: var(--bt-surface);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
  }
  .site-nav__toggle-bar {
    display: block;
    width: 18px; height: 1.5px;
    background: var(--bt-ink);
    border-radius: 2px;
    transition: transform var(--bt-dur) var(--bt-ease), opacity var(--bt-dur) var(--bt-ease);
  }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) { opacity: 0; }
  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

  @media (max-width: 880px) {
    .site-nav__toggle { display: inline-flex; }
    .site-nav__menu {
      position: absolute;
      top: 100%; left: 0; right: 0;
      flex-direction: column;
      align-items: stretch;
      gap: 0;
      background: var(--bt-paper);
      border-top: 1px solid var(--bt-rule);
      border-bottom: 1px solid var(--bt-rule);
      padding: var(--sp-4) calc((100% - var(--bt-shell)) / 2 + 1.25rem);
      transform-origin: top;
      transform: scaleY(0);
      opacity: 0;
      pointer-events: none;
      transition: transform var(--bt-dur) var(--bt-ease), opacity var(--bt-dur) var(--bt-ease);
    }
    .site-nav__menu li { border-bottom: 1px solid var(--bt-rule); }
    .site-nav__menu li:last-child { border-bottom: 0; }
    .site-nav__menu a { display: block; padding-block: 0.85rem; font-size: var(--fs-md); }
    .site-nav__toggle[aria-expanded="true"] ~ .site-nav__menu {
      transform: scaleY(1);
      opacity: 1;
      pointer-events: auto;
    }
  }

  /* theme toggle */
  .theme-toggle {
    width: 40px; height: 40px;
    border: 1px solid var(--bt-rule-strong);
    border-radius: var(--bt-radius);
    background: var(--bt-surface);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--bt-ink);
    transition: border-color var(--bt-dur) var(--bt-ease), color var(--bt-dur) var(--bt-ease);
  }
  .theme-toggle:hover { color: var(--bt-accent); border-color: var(--bt-accent); }
  .theme-toggle__icon { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
  /* default (light): show sun, hide moon */
  .theme-toggle__icon--sun  { display: block; }
  .theme-toggle__icon--moon { display: none; }
  /* system dark, no manual override */
  @media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .theme-toggle__icon--sun  { display: none; }
    html:not([data-theme="light"]) .theme-toggle__icon--moon { display: block; }
  }
  /* manual overrides win */
  html[data-theme="dark"]  .theme-toggle__icon--sun  { display: none; }
  html[data-theme="dark"]  .theme-toggle__icon--moon { display: block; }
  html[data-theme="light"] .theme-toggle__icon--sun  { display: block; }
  html[data-theme="light"] .theme-toggle__icon--moon { display: none; }

  /* === Buttons === */
  .button {
    --_pad-y: 0.85em;
    --_pad-x: 1.4em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--_pad-y) var(--_pad-x);
    border-radius: 999px;
    font-family: var(--bt-font-body);
    font-size: var(--fs-sm);
    font-weight: 600;
    letter-spacing: 0.005em;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform var(--bt-dur) var(--bt-ease), background var(--bt-dur) var(--bt-ease), border-color var(--bt-dur) var(--bt-ease), color var(--bt-dur) var(--bt-ease);
    will-change: transform;
  }
  .button:hover { transform: translateY(-1px); }
  .button:active { transform: translateY(0); }

  .button--primary {
    background: var(--bt-ink);
    color: var(--bt-paper);
  }
  .button--primary:hover { background: var(--bt-accent); color: #fff; }

  .button--ghost {
    background: transparent;
    color: var(--bt-ink);
    border-color: var(--bt-rule-strong);
  }
  .button--ghost:hover { border-color: var(--bt-ink); color: var(--bt-ink); }

  .button--accent {
    background: var(--bt-accent);
    color: #fff;
  }
  .button--accent:hover { background: var(--bt-accent-deep); }

  /* === Hero === */
  .hero { position: relative; padding-block: clamp(var(--sp-7), 6vw, var(--sp-10)); overflow: hidden; }
  .hero__bg {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(to right, var(--bt-rule) 1px, transparent 1px),
      linear-gradient(to bottom, var(--bt-rule) 1px, transparent 1px);
    background-size: 80px 80px;
    background-position: -1px -1px;
    mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 30%, transparent 75%);
    pointer-events: none;
    opacity: 0.6;
  }
  .hero__grid {
    position: relative;
    width: var(--bt-shell);
    margin-inline: auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-7);
  }
  @media (min-width: 960px) {
    .hero__grid { grid-template-columns: 1.4fr 1fr; gap: var(--sp-7); align-items: end; }
  }
  .hero__content { display: flex; flex-direction: column; gap: var(--sp-5); }
  .hero__eyebrow {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--bt-muted);
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
  }
  .hero__eyebrow::before {
    content: "";
    width: 28px; height: 1px;
    background: var(--bt-accent);
  }
  .hero__title {
    font-size: var(--fs-5xl);
    line-height: 0.95;
    letter-spacing: -0.03em;
    font-weight: 400;
    margin: 0;
  }
  .hero__title em {
    font-style: italic;
    font-variation-settings: "SOFT" 100, "WONK" 1;
    color: var(--bt-accent);
  }
  .hero__lede {
    font-size: var(--fs-lg);
    color: var(--bt-ink-soft);
    max-width: 48ch;
    line-height: 1.5;
    margin: 0;
  }
  .hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-3);
    margin-top: var(--sp-3);
  }

  .hero__meta { display: flex; flex-direction: column; gap: var(--sp-5); }
  .hero__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--bt-rule-strong);
    border-bottom: 1px solid var(--bt-rule-strong);
  }
  .hero__stats > div {
    padding-block: var(--sp-4);
    padding-inline: var(--sp-3);
    border-inline-end: 1px solid var(--bt-rule);
  }
  .hero__stats > div:last-child { border-inline-end: 0; }
  .hero__stats dt {
    font-family: var(--bt-font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--bt-muted);
    margin-bottom: var(--sp-1);
  }
  .hero__stats dd {
    margin: 0;
    font-family: var(--bt-font-display);
    font-size: var(--fs-xl);
    font-weight: 500;
    color: var(--bt-ink);
    font-variant-numeric: tabular-nums lining-nums;
  }
  .hero__stats .unit {
    font-family: var(--bt-font-body);
    font-size: var(--fs-sm);
    color: var(--bt-muted);
    font-weight: 400;
  }

  .hero__device {
    margin: 0;
    padding: var(--sp-4);
    border: 1px solid var(--bt-rule-strong);
    border-radius: var(--bt-radius-lg);
    background: var(--bt-surface);
    box-shadow: 0 1px 0 var(--bt-rule), 0 18px 48px -24px rgba(0,0,0,0.18);
    aspect-ratio: 16/10;
    overflow: hidden;
  }
  .hero__device svg { width: 100%; height: 100%; }

  /* === Features grid === */
  .features__grid {
    list-style: none;
    margin: 0; padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: 1px;
    background: var(--bt-rule);
    border: 1px solid var(--bt-rule);
  }
  .feature {
    background: var(--bt-paper);
    padding: var(--sp-6);
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
    transition: background var(--bt-dur) var(--bt-ease);
    container-type: inline-size;
  }
  .feature:hover { background: var(--bt-paper-2); }
  .feature__icon {
    width: 40px; height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--bt-accent);
    border: 1px solid var(--bt-rule-strong);
    border-radius: 50%;
    margin-bottom: var(--sp-2);
  }
  .feature__icon svg {
    width: 18px; height: 18px;
    stroke: currentColor; fill: none;
    stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
  }
  .feature__num {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    color: var(--bt-muted);
    letter-spacing: 0.1em;
  }
  .feature__title {
    font-size: var(--fs-xl);
    margin: 0;
  }
  .feature p {
    color: var(--bt-ink-soft);
    font-size: var(--fs-sm);
    line-height: 1.6;
  }

  /* === Process / How it works === */
  .process { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); }
  @media (min-width: 720px) {
    .process { grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--bt-rule); border-bottom: 1px solid var(--bt-rule); }
  }
  .process__step {
    padding: var(--sp-5) 0;
  }
  @media (min-width: 720px) {
    .process__step {
      padding: var(--sp-5);
      border-inline-end: 1px solid var(--bt-rule);
    }
    .process__step:last-child { border-inline-end: 0; }
  }
  .process__num {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    color: var(--bt-accent);
    letter-spacing: 0.18em;
    margin-bottom: var(--sp-3);
  }
  .process__num::after {
    content: ""; width: 24px; height: 1px; background: var(--bt-accent);
  }
  .process__title { font-size: var(--fs-xl); margin: 0 0 var(--sp-2); }
  .process__step p { color: var(--bt-ink-soft); font-size: var(--fs-sm); margin: 0; }

  /* === FAQ === */
  .faq { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--bt-rule); }
  .faq details {
    border-bottom: 1px solid var(--bt-rule);
    padding: var(--sp-4) 0;
  }
  .faq summary {
    list-style: none;
    cursor: pointer;
    font-family: var(--bt-font-display);
    font-size: var(--fs-lg);
    color: var(--bt-ink);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--sp-4);
    padding-block: var(--sp-2);
    transition: color var(--bt-dur) var(--bt-ease);
  }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after {
    content: "+";
    font-family: var(--bt-font-mono);
    font-size: 1.5rem;
    color: var(--bt-muted);
    transition: transform var(--bt-dur) var(--bt-ease), color var(--bt-dur) var(--bt-ease);
  }
  .faq details[open] summary::after { content: "−"; color: var(--bt-accent); }
  .faq summary:hover { color: var(--bt-accent); }
  .faq details p {
    color: var(--bt-ink-soft);
    margin-top: var(--sp-3);
    max-width: 65ch;
  }

  /* === CTA Banner === */
  .cta-banner {
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: clamp(var(--sp-7), 5vw, var(--sp-9));
    border-radius: var(--bt-radius-lg);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-5);
    align-items: end;
    position: relative;
    overflow: hidden;
  }
  @media (min-width: 720px) { .cta-banner { grid-template-columns: 2fr 1fr; gap: var(--sp-7); } }
  .cta-banner::before {
    content: "§";
    position: absolute;
    top: var(--sp-4);
    right: var(--sp-5);
    font-family: var(--bt-font-display);
    font-size: 4rem;
    color: var(--bt-accent);
    line-height: 1;
  }
  .cta-banner h2 {
    color: var(--bt-paper);
    font-size: var(--fs-3xl);
    margin: 0;
    max-width: 22ch;
  }
  .cta-banner p {
    color: color-mix(in srgb, var(--bt-paper) 70%, transparent);
    margin-top: var(--sp-3);
  }
  .cta-banner .button--primary { background: var(--bt-accent); color: #fff; }
  .cta-banner .button--primary:hover { background: var(--bt-accent-deep); }
  .cta-banner .button--ghost { color: var(--bt-paper); border-color: color-mix(in srgb, var(--bt-paper) 30%, transparent); }
  .cta-banner .button--ghost:hover { border-color: var(--bt-paper); }

  /* === Article / single post === */
  .entry-header { margin-bottom: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-3); }
  .entry-eyebrow {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--bt-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
  }
  .entry-eyebrow a { color: var(--bt-accent); text-decoration: none; }
  .entry-title {
    font-size: var(--fs-4xl);
    line-height: 1;
    letter-spacing: -0.025em;
    margin: 0;
  }
  .entry-meta {
    color: var(--bt-muted);
    font-size: var(--fs-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-3);
    align-items: center;
  }
  .entry-meta::after { display: none; }
  .entry-meta > * + *::before {
    content: "·";
    margin-right: var(--sp-3);
    color: var(--bt-rule-strong);
  }

  .entry-feature {
    margin-block: var(--sp-6);
    border-radius: var(--bt-radius-lg);
    overflow: hidden;
    border: 1px solid var(--bt-rule);
  }

  .entry-content {
    font-size: var(--fs-md);
    line-height: 1.75;
  }
  .entry-content > * { margin-block: var(--sp-4); }
  .entry-content > h2 { font-size: var(--fs-2xl); margin-top: var(--sp-7); }
  .entry-content > h3 { font-size: var(--fs-xl); margin-top: var(--sp-6); }
  .entry-content > p:first-of-type::first-letter {
    font-family: var(--bt-font-display);
    font-size: 4em;
    line-height: 0.85;
    float: left;
    padding-right: 0.12em;
    margin-top: 0.05em;
    color: var(--bt-accent);
    font-weight: 500;
  }
  .entry-content figure { margin: var(--sp-6) 0; }
  .entry-content figcaption {
    color: var(--bt-muted);
    font-size: var(--fs-sm);
    text-align: center;
    margin-top: var(--sp-2);
  }
  .entry-content ul, .entry-content ol { padding-inline-start: 1.5em; }
  .entry-content li { margin-block: var(--sp-2); }
  .entry-content a { color: var(--bt-accent); text-decoration-color: var(--bt-accent-soft); }
  .entry-content a:hover { text-decoration-color: var(--bt-accent); }

  .entry-footer {
    margin-top: var(--sp-7);
    padding-top: var(--sp-5);
    border-top: 1px solid var(--bt-rule);
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-4);
    justify-content: space-between;
    color: var(--bt-muted);
    font-size: var(--fs-sm);
  }
  .entry-tags { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
  .entry-tags a {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--bt-ink-soft);
    text-decoration: none;
    padding: 0.3em 0.7em;
    border: 1px solid var(--bt-rule-strong);
    border-radius: 999px;
    transition: color var(--bt-dur), border-color var(--bt-dur);
  }
  .entry-tags a:hover { color: var(--bt-accent); border-color: var(--bt-accent); }

  /* === Post cards (archive/index) === */
  .post-list {
    list-style: none;
    margin: 0; padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
  }
  .post-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-4);
    padding-block: var(--sp-6);
    border-bottom: 1px solid var(--bt-rule);
    align-items: start;
  }
  @media (min-width: 720px) {
    .post-card {
      grid-template-columns: minmax(0, 6rem) minmax(0, 1fr) minmax(0, 14rem);
      gap: var(--sp-6);
      align-items: start;
    }
  }
  .post-card__num {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--bt-muted);
    padding-top: 0.4em;
  }
  .post-card__body { display: flex; flex-direction: column; gap: var(--sp-3); }
  .post-card__title {
    font-size: var(--fs-2xl);
    margin: 0;
    line-height: 1.05;
    letter-spacing: -0.02em;
  }
  .post-card__title a { text-decoration: none; }
  .post-card__title a:hover { color: var(--bt-accent); }
  .post-card__excerpt { color: var(--bt-ink-soft); margin: 0; max-width: 60ch; }
  .post-card__meta {
    color: var(--bt-muted);
    font-size: var(--fs-xs);
    font-family: var(--bt-font-mono);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: flex;
    gap: var(--sp-3);
    flex-wrap: wrap;
  }
  .post-card__thumb {
    aspect-ratio: 4/3;
    overflow: hidden;
    border-radius: var(--bt-radius);
    border: 1px solid var(--bt-rule);
    background: var(--bt-paper-2);
  }
  .post-card__thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 600ms var(--bt-ease); }
  .post-card:hover .post-card__thumb img { transform: scale(1.04); }

  /* === Pagination === */
  .pagination {
    margin-top: var(--sp-7);
    display: flex;
    gap: var(--sp-3);
    justify-content: center;
  }
  .pagination .page-numbers {
    min-width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.8rem;
    border: 1px solid var(--bt-rule-strong);
    border-radius: var(--bt-radius);
    font-family: var(--bt-font-mono);
    font-size: var(--fs-sm);
    text-decoration: none;
    color: var(--bt-ink);
    transition: border-color var(--bt-dur), color var(--bt-dur), background var(--bt-dur);
  }
  .pagination .page-numbers:hover { border-color: var(--bt-accent); color: var(--bt-accent); }
  .pagination .page-numbers.current { background: var(--bt-ink); color: var(--bt-paper); border-color: var(--bt-ink); }

  /* === Comments === */
  .comments-area { margin-top: var(--sp-7); padding-top: var(--sp-6); border-top: 1px solid var(--bt-rule); }
  .comments-title { font-size: var(--fs-2xl); margin-bottom: var(--sp-5); }
  .comment-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--sp-5); }
  .comment-list .comment { padding: var(--sp-4); border: 1px solid var(--bt-rule); border-radius: var(--bt-radius-lg); background: var(--bt-surface); }
  .comment-list .children { list-style: none; margin: var(--sp-4) 0 0 var(--sp-4); padding-left: var(--sp-4); border-left: 1px solid var(--bt-rule); display: flex; flex-direction: column; gap: var(--sp-4); }
  .comment-meta { display: flex; align-items: center; gap: var(--sp-3); margin-bottom: var(--sp-3); }
  .comment-author { font-weight: 600; }
  .comment-metadata { font-size: var(--fs-xs); color: var(--bt-muted); font-family: var(--bt-font-mono); text-transform: uppercase; letter-spacing: 0.12em; }
  .comment-form { display: flex; flex-direction: column; gap: var(--sp-3); margin-top: var(--sp-5); }
  .comment-form .form-submit input { align-self: flex-start; }

  /* === Sidebar / widgets === */
  .widget { margin-bottom: var(--sp-6); }
  .widget-title {
    font-family: var(--bt-font-mono);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--bt-muted);
    margin-bottom: var(--sp-3);
    padding-bottom: var(--sp-2);
    border-bottom: 1px solid var(--bt-rule);
  }
  .widget ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--sp-2); }
  .widget li a { text-decoration: none; }
  .widget li a:hover { color: var(--bt-accent); }

  /* === Site footer === */
  .site-footer {
    margin-top: var(--sp-9);
    border-top: 1px solid var(--bt-rule-strong);
    padding-block: var(--sp-7) var(--sp-5);
  }
  .site-footer__inner {
    width: var(--bt-shell);
    margin-inline: auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }
  @media (min-width: 720px) { .site-footer__inner { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
  .site-footer__brand { display: flex; flex-direction: column; gap: var(--sp-2); }
  .site-footer__title { font-family: var(--bt-font-display); font-size: var(--fs-xl); font-weight: 600; margin: 0; letter-spacing: -0.01em; }
  .site-footer__title::before { content: "● "; color: var(--bt-accent); }
  .site-footer__tagline { color: var(--bt-muted); font-size: var(--fs-sm); margin: 0; max-width: 32ch; }
  .site-footer__widgets,
  .site-footer__nav { display: flex; flex-direction: column; gap: var(--sp-3); }
  .site-footer__menu { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--sp-2); }
  .site-footer__menu a { text-decoration: none; font-size: var(--fs-sm); color: var(--bt-ink-soft); }
  .site-footer__menu a:hover { color: var(--bt-accent); }
  .site-footer__bottom {
    width: var(--bt-shell);
    margin: var(--sp-7) auto 0;
    padding-top: var(--sp-4);
    border-top: 1px solid var(--bt-rule);
    color: var(--bt-muted);
    font-size: var(--fs-xs);
    font-family: var(--bt-font-mono);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--sp-3);
  }

  /* === Search form === */
  .search-form {
    display: flex;
    gap: 0;
    border: 1px solid var(--bt-rule-strong);
    border-radius: 999px;
    overflow: hidden;
    background: var(--bt-surface);
  }
  .search-form input[type="search"] {
    border: 0;
    border-radius: 0;
    background: transparent;
    flex: 1;
    padding: 0.75em 1.2em;
  }
  .search-form input[type="search"]:focus { box-shadow: none; }
  .search-form button, .search-form input[type="submit"] {
    border-radius: 0;
    border: 0;
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: 0 1.4em;
    cursor: pointer;
    font-weight: 600;
    font-size: var(--fs-sm);
  }
  .search-form button:hover, .search-form input[type="submit"]:hover { background: var(--bt-accent); color: #fff; }

  /* === 404 === */
  .error-404 {
    text-align: center;
    padding-block: var(--sp-9);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-4);
  }
  .error-404__code {
    font-family: var(--bt-font-display);
    font-size: clamp(6rem, 12vw, 12rem);
    line-height: 0.85;
    letter-spacing: -0.04em;
    color: var(--bt-accent);
    font-weight: 400;
    font-variation-settings: "SOFT" 100, "WONK" 1;
  }
  .error-404 .search-form { max-width: 420px; width: 100%; }
}

/* --------------------------------------------------------------------------
   Block editor adjustments
   -------------------------------------------------------------------------- */
@layer blocks {
  .alignwide  { width: min(var(--bt-shell), 100%); margin-inline: auto; }
  .alignfull  { width: 100vw; margin-inline: calc(50% - 50vw); }
  .wp-block-image figcaption,
  .wp-block-quote cite { color: var(--bt-muted); font-size: var(--fs-sm); }
  .wp-block-button__link {
    background-color: var(--bt-ink);
    color: var(--bt-paper);
    border-radius: 999px;
    font-weight: 600;
    padding: 0.85em 1.4em;
  }
  .wp-block-table { border: 1px solid var(--bt-rule); }
  .wp-block-table th, .wp-block-table td { border-bottom: 1px solid var(--bt-rule); padding: 0.6em 0.8em; }
  .wp-block-pullquote {
    border-top: 1px solid var(--bt-rule-strong);
    border-bottom: 1px solid var(--bt-rule-strong);
    padding-block: var(--sp-5);
    color: var(--bt-ink);
  }
}

/* --------------------------------------------------------------------------
   Utilities + Reveal animation
   -------------------------------------------------------------------------- */
@layer utilities {
  .stack > * + * { margin-top: var(--sp-4); }
  .center-text { text-align: center; }
  .accent { color: var(--bt-accent); }
  .muted { color: var(--bt-muted); }
  .mono { font-family: var(--bt-font-mono); }

  /* On-load reveal — staggered, respects reduced-motion */
  @keyframes bt-rise {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .reveal {
    opacity: 0;
    animation: bt-rise 700ms var(--bt-ease) forwards;
    animation-delay: var(--reveal-delay, 0ms);
  }
  @media (prefers-reduced-motion: reduce) {
    .reveal { animation: none; opacity: 1; }
  }
}
