/* =========================================================================
   brace.sh — industrial-utilitarian dark theme
   --------------------------------------------------------------------------
   Typography:  IBM Plex Mono (display) + IBM Plex Sans (body)
   Palette:     warm charcoal / steel / amber warning
   Construction: hard 1px rules, monospace indices, no border-radius
   ========================================================================= */

:root {
  /* surfaces */
  --bg:           #0c0d10;
  --bg-elevated:  #14161b;
  --bg-cell:      #101216;
  --bg-rule:      #1c1f25;

  /* foreground */
  --fg:           #ebe8e0;
  --fg-strong:    #fffaf0;
  --fg-muted:     #8a877e;
  --fg-faint:     #4d4b46;

  /* accent — amber warning lamp */
  --accent:       #f5a524;
  --accent-dim:   #c47e0c;
  --accent-glow:  rgba(245, 165, 36, 0.18);

  /* structure */
  --rule:         #23262d;
  --rule-strong:  #353941;
  --selection-bg: #f5a524;
  --selection-fg: #0c0d10;

  /* type */
  --font-display: 'IBM Plex Mono', ui-monospace, 'JetBrains Mono', Menlo, Consolas, monospace;
  --font-body:    'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, Menlo, Consolas, monospace;

  /* rhythm */
  --gutter: 1.5rem;
  --container-max: 76rem;
  --reading-max: 52rem;
}

@media (min-width: 640px)  { :root { --gutter: 2rem; } }
@media (min-width: 960px)  { :root { --gutter: 2.5rem; } }

/* ----------------------------------------------------------------------- */
/* Reset                                                                   */
/* ----------------------------------------------------------------------- */

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

html {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: -1px -1px;
  display: flex;
  flex-direction: column;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--fg-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

a:hover,
a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ----------------------------------------------------------------------- */
/* Container                                                               */
/* ----------------------------------------------------------------------- */

.container {
  width: min(100% - 2 * var(--gutter), var(--container-max));
  margin-inline: auto;
}

.container--reading {
  width: min(100% - 2 * var(--gutter), var(--reading-max));
}

/* ----------------------------------------------------------------------- */
/* Scanline overlay (extremely subtle)                                     */
/* ----------------------------------------------------------------------- */

.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.012) 0,
    rgba(255, 255, 255, 0.012) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
}

/* ----------------------------------------------------------------------- */
/* Header                                                                  */
/* ----------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(12, 13, 16, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.25rem;
}

.site-header__rule {
  height: 1px;
  background: var(--rule);
  position: relative;
}

.site-header__rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 1px;
  width: 6rem;
  background: var(--accent);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--fg-strong);
  border-bottom: none;
}

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

.brand__mark {
  color: var(--accent);
  font-size: 0.8rem;
}

.brand__name {
  text-transform: lowercase;
}

.brand__suffix {
  color: var(--fg-muted);
  font-weight: 400;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  border: 1px solid transparent;
  border-bottom: none;
}

.site-nav__link:hover {
  color: var(--fg-strong);
  border-color: var(--rule-strong);
}

.site-nav__link.is-active {
  color: var(--accent);
  border-color: var(--rule-strong);
  background: var(--bg-elevated);
}

.site-nav__index {
  font-size: 0.65rem;
  color: var(--fg-faint);
}

.site-nav__link.is-active .site-nav__index {
  color: var(--accent-dim);
}

/* ----------------------------------------------------------------------- */
/* Hero                                                                    */
/* ----------------------------------------------------------------------- */

.hero {
  position: relative;
  padding-block: clamp(3rem, 8vw, 7rem) clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 70vw;
  height: 70vw;
  max-width: 900px;
  max-height: 900px;
  background: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.hero__inner {
  position: relative;
  z-index: 1;
  animation: rise 700ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.25rem;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  border: 1px solid var(--accent);
}

.tag--ghost {
  background: transparent;
  color: var(--fg-muted);
  border-color: var(--rule-strong);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 5.25rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin: 0 0 2rem;
  color: var(--fg-strong);
  text-transform: lowercase;
}

.hero__title-line {
  display: block;
}

.hero__title-line--muted {
  color: var(--fg-muted);
  font-weight: 400;
}

.accent {
  color: var(--accent);
}

.hero__lede {
  max-width: 38rem;
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.55;
  color: var(--fg);
  margin: 0 0 2rem;
}

.hero__stack {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-muted);
}

.hero__stack-sep {
  color: var(--fg-faint);
}

.kbd {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--rule-strong);
  background: var(--bg-cell);
  color: var(--fg);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__diagram {
  position: absolute;
  right: var(--gutter);
  bottom: 0;
  z-index: 0;
  opacity: 0.25;
  pointer-events: none;
  display: none;
}

@media (min-width: 1100px) {
  .hero__diagram {
    display: block;
  }
}

.diagram {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  line-height: 1.2;
  color: var(--accent);
  margin: 0;
  white-space: pre;
}

/* ----------------------------------------------------------------------- */
/* Buttons                                                                 */
/* ----------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid var(--rule-strong);
  background: transparent;
  color: var(--fg-strong);
  border-bottom-width: 1px;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.btn:hover,
.btn:focus-visible {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
  transform: translate(-1px, -1px);
}

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

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--fg-strong);
  border-color: var(--fg-strong);
  color: var(--bg);
}

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

.btn__arrow {
  font-size: 1rem;
  transition: transform 140ms ease;
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ----------------------------------------------------------------------- */
/* Bands (sections)                                                        */
/* ----------------------------------------------------------------------- */

.band {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--rule);
}

.band__head {
  margin-bottom: 2.5rem;
  max-width: 52rem;
}

.band__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
}

.band__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  text-transform: lowercase;
  color: var(--fg-strong);
  margin: 0 0 0.75rem;
}

.band__subtitle {
  margin: 0;
  color: var(--fg-muted);
  font-size: 1rem;
  max-width: 38rem;
}

/* ----------------------------------------------------------------------- */
/* Feature grid                                                            */
/* ----------------------------------------------------------------------- */

.grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.grid--features {
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--features { grid-template-columns: 1fr 1fr; }
}

.cell {
  background: var(--bg-cell);
  padding: 1.75rem 1.5rem 2rem;
  position: relative;
  transition: background 180ms ease;
}

.cell:hover {
  background: var(--bg-elevated);
}

.cell__index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.85rem;
}

.cell__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  text-transform: lowercase;
  letter-spacing: -0.005em;
  margin: 0 0 0.5rem;
  color: var(--fg-strong);
}

.cell__body {
  margin: 0;
  color: var(--fg);
  font-size: 0.95rem;
  line-height: 1.55;
}

.cell code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-rule);
  padding: 0.05rem 0.35rem;
  border: 1px solid var(--rule-strong);
}

/* ----------------------------------------------------------------------- */
/* Module rows                                                             */
/* ----------------------------------------------------------------------- */

.grid--modules {
  display: block;
  background: transparent;
  border: 1px solid var(--rule);
}

.row {
  display: grid;
  grid-template-columns: 3.5rem 1fr 0.85fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--rule);
  background: var(--bg-cell);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  transition: background 160ms ease, padding 160ms ease;
}

.row:last-child { border-bottom: none; }

.row:hover {
  background: var(--bg-elevated);
  padding-left: 1.6rem;
}

.row__index {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.row__name {
  color: var(--fg-strong);
  font-weight: 500;
  text-transform: lowercase;
}

.row__desc {
  color: var(--fg-muted);
  font-family: var(--font-body);
  font-size: 0.9rem;
}

.row__status {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--fg-muted);
  padding: 0.2rem 0.55rem;
  white-space: nowrap;
}

@media (max-width: 720px) {
  .row {
    grid-template-columns: 2.5rem 1fr auto;
    grid-template-areas:
      "idx name status"
      "idx desc desc";
    row-gap: 0.25rem;
  }
  .row__index { grid-area: idx; }
  .row__name  { grid-area: name; }
  .row__desc  { grid-area: desc; }
  .row__status { grid-area: status; }
}

/* ----------------------------------------------------------------------- */
/* Audience                                                                */
/* ----------------------------------------------------------------------- */

.grid--audience {
  grid-template-columns: 1fr;
  margin-bottom: 2rem;
}

@media (min-width: 720px) {
  .grid--audience { grid-template-columns: 1fr 1fr; }
}

.audience-cell {
  background: var(--bg-cell);
  padding: 1.65rem 1.5rem 1.75rem;
  transition: background 180ms ease;
}

.audience-cell:hover { background: var(--bg-elevated); }

.audience-cell__label {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  background: transparent;
  text-transform: lowercase;
}

.audience-cell__body {
  margin: 0;
  color: var(--fg);
  font-size: 0.98rem;
  line-height: 1.55;
}

.audience__paragraph {
  max-width: 42rem;
  color: var(--fg-muted);
  margin: 0;
}

/* ----------------------------------------------------------------------- */
/* Mailing list                                                            */
/* ----------------------------------------------------------------------- */

.signup {
  max-width: 44rem;
}

.signup__form {
  border: 1px solid var(--rule-strong);
  background: var(--bg-cell);
  padding: 1.75rem 1.5rem 1.5rem;
}

.signup__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 0.75rem;
}

.signup__label-index {
  color: var(--accent);
}

.signup__row {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  border: 1px solid var(--rule-strong);
}

.signup__input {
  flex: 1 1 16rem;
  min-width: 0;
  padding: 0.95rem 1rem;
  background: var(--bg);
  border: none;
  outline: none;
  color: var(--fg-strong);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.signup__input::placeholder {
  color: var(--fg-faint);
}

.signup__input:focus {
  background: var(--bg-elevated);
}

.signup__submit {
  border: none;
  border-left: 1px solid var(--rule-strong);
}

.signup__status {
  margin: 0.85rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  min-height: 1.2em;
  color: var(--fg-muted);
}

.signup__status[data-state="success"] { color: var(--accent); }
.signup__status[data-state="error"]   { color: #f08080; }

.signup__privacy {
  margin: 0.85rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
}

.signup__privacy a {
  color: var(--fg-muted);
  border-bottom-color: var(--rule);
}

.signup__privacy a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.signup__powered {
  display: inline-block;
  margin-left: 0.5rem;
  padding-left: 0.65rem;
  border-left: 1px solid var(--rule);
  color: var(--fg-faint);
}

/* ----------------------------------------------------------------------- */
/* Blog list                                                               */
/* ----------------------------------------------------------------------- */

.band--blog {
  padding-block: clamp(3rem, 6vw, 5rem);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.post-row {
  border-bottom: 1px solid var(--rule);
}

.post-row__link {
  display: grid;
  grid-template-columns: 8rem 1fr;
  grid-template-areas:
    "date title"
    "date description";
  column-gap: 1.25rem;
  row-gap: 0.4rem;
  padding: 1.5rem 0;
  border: none;
  color: var(--fg-strong);
  align-items: baseline;
  transition: padding 160ms ease, background 160ms ease;
}

.post-row__date        { grid-area: date; }
.post-row__title       { grid-area: title; margin-bottom: 0; }
.post-row__description { grid-area: description; }

.post-row__link:hover {
  padding-left: 1rem;
  padding-right: 1rem;
  background: var(--bg-cell);
  color: var(--fg-strong);
}

.post-row__date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.post-row__title {
  display: block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  text-transform: lowercase;
  letter-spacing: -0.01em;
  color: var(--fg-strong);
  margin-bottom: 0.4rem;
}

.post-row__description {
  display: block;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.post-row--empty {
  padding: 2rem 0;
}

.post-row--empty .post-row__title {
  color: var(--fg-muted);
}

@media (max-width: 640px) {
  .post-row__link {
    grid-template-columns: 1fr;
    grid-template-areas:
      "date"
      "title"
      "description";
    row-gap: 0.4rem;
  }
}

/* ----------------------------------------------------------------------- */
/* Blog post (article)                                                     */
/* ----------------------------------------------------------------------- */

.post {
  padding-block: clamp(3rem, 6vw, 5rem);
}

.post__header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.post__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin: 0 0 1.5rem;
}

.post__back {
  border: none;
  color: var(--fg-muted);
}

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

.post__date {
  color: var(--accent);
}

.post__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  text-transform: lowercase;
  color: var(--fg-strong);
  margin: 0;
}

.prose {
  font-size: 1.13rem;
  line-height: 1.7;
  color: var(--fg);
  text-align: justify;
  hyphens: auto;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.005em;
  text-transform: lowercase;
  color: var(--fg-strong);
  line-height: 1.2;
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
}

.prose h1 { font-size: 1.8rem; }
.prose h2 { font-size: 1.45rem; }
.prose h3 { font-size: 1.2rem; }
.prose h4 { font-size: 1rem; }

.prose p { margin: 0 0 1.1rem; }

.prose a {
  color: var(--accent);
  border-bottom-color: var(--accent-dim);
}

.prose a:hover { color: var(--fg-strong); border-bottom-color: var(--fg-strong); }

.prose ul, .prose ol {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.prose li { margin-bottom: 0.4rem; }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-cell);
  border: 1px solid var(--rule);
  padding: 0.05rem 0.35rem;
}

.prose pre {
  background: var(--bg-cell);
  border: 1px solid var(--rule-strong);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.55;
  margin: 0 0 1.5rem;
}

.prose pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* ----------------------------------------------------------------------- */
/* Footer                                                                  */
/* ----------------------------------------------------------------------- */

.site-footer {
  margin-top: auto;
  padding-bottom: 2.5rem;
}

.site-footer__rule {
  height: 1px;
  background: var(--rule);
  margin-bottom: 2rem;
  position: relative;
}

.site-footer__rule::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  height: 1px;
  width: 6rem;
  background: var(--accent);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer__line {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg);
}

.site-footer__label {
  color: var(--fg-faint);
}

.site-footer a {
  color: var(--fg);
  border-bottom-color: var(--rule-strong);
}

.site-footer a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ----------------------------------------------------------------------- */
/* Animations                                                              */
/* ----------------------------------------------------------------------- */

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}