/* BIKESHQ.ONLINE — Workshop manual / spec-sheet aesthetic */
:root {
  --asphalt-900: #1B1D21;
  --steel-700: #3A3F47;
  --paper-50: #F5F3EE;
  --paper-100: #EBE8E0;
  --signal-red: #E1421C;
  --signal-red-dark: #C23616;
  --amber-caution: #F2A93B;
  --chrome-grey: #C7C9CC;
  --text: #1B1D21;
  --text-mute: #5A5E66;
  --white: #FFFFFF;
  --max: 1180px;
  --font-display: "Barlow Condensed", "Noto Sans JP", sans-serif;
  --font-body: "Noto Sans JP", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --header-h: 68px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }

body {
  font-family: var(--font-body);
  background: var(--paper-50);
  color: var(--text);
  line-height: 1.75;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--signal-red); text-decoration: none; transition: color .2s; }
a:hover { color: var(--signal-red-dark); }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--signal-red);
  color: #fff;
  padding: .5rem 1rem;
  z-index: 9999;
}
.skip-link:focus { left: 0; }

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

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--asphalt-900);
  border-bottom: 1px solid var(--steel-700);
}
.header-bar {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.logo { display: flex; flex-direction: column; gap: .1rem; color: var(--white); }
.logo:hover { color: var(--white); }
.logo-mark {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
}
.logo-mark span { color: var(--signal-red); }
.logo-tag {
  font-size: .65rem;
  color: var(--chrome-grey);
  letter-spacing: .04em;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--steel-700);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--chrome-grey);
}
.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: .15rem;
}
.nav-trigger {
  background: none;
  border: 0;
  color: var(--chrome-grey);
  padding: .65rem .85rem;
  cursor: pointer;
  font-size: .88rem;
  font-weight: 500;
  letter-spacing: .02em;
  text-transform: capitalize;
}
.primary-nav .btn-cta,
.mega-inner strong {
  text-transform: capitalize;
}
.nav-trigger:hover,
.has-mega.is-active .nav-trigger,
.has-mega.is-open .nav-trigger {
  color: var(--white);
}
.has-mega { position: relative; }
.mega {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 320px;
  padding-top: .5rem;
  z-index: 50;
}
.has-mega.is-open .mega,
.has-mega:hover .mega { display: block; }
.mega-inner {
  background: var(--asphalt-900);
  border: 1px solid var(--steel-700);
  padding: .5rem;
  display: grid;
  gap: .15rem;
  box-shadow: 0 16px 40px rgba(0,0,0,.35);
}
.mega-inner a {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding: .7rem .85rem;
  color: var(--chrome-grey);
  border-radius: 2px;
}
.mega-inner a:hover {
  background: var(--steel-700);
  color: var(--white);
}
.mega-inner strong {
  color: var(--white);
  font-size: .9rem;
  font-weight: 700;
}
.mega-inner span { font-size: .75rem; color: var(--chrome-grey); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .7rem 1.25rem;
  font-size: .85rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.btn-cta {
  background: var(--signal-red);
  color: var(--white);
  border-color: var(--signal-red);
}
.btn-cta:hover {
  background: var(--signal-red-dark);
  color: var(--white);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--asphalt-900);
  border-color: var(--chrome-grey);
}
.btn-ghost:hover {
  border-color: var(--signal-red);
  color: var(--signal-red);
}
.btn-block { width: 100%; }
.btn-amber {
  background: var(--amber-caution);
  color: var(--asphalt-900);
  border-color: var(--amber-caution);
}

/* —— Spec bar (signature) —— */
.spec-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--asphalt-900);
  border: 1px solid var(--steel-700);
  margin: 1.25rem 0 1.75rem;
}
.spec-item {
  padding: .9rem 1rem;
  border-right: 2px solid var(--signal-red);
  display: flex;
  flex-direction: column;
  gap: .25rem;
  min-width: 0;
}
.spec-item:last-child { border-right: 0; }
.spec-label {
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--chrome-grey);
  text-transform: uppercase;
}
.spec-value {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: .02em;
  word-break: break-word;
}
.spec-bar--mini {
  margin: .75rem 0 0;
  grid-template-columns: repeat(3, 1fr);
}
.spec-bar--mini .spec-item { padding: .55rem .7rem; }
.spec-bar--mini .spec-value { font-size: .78rem; }

/* —— Homepage hero (manual cover) —— */
.hero-manual {
  position: relative;
  isolation: isolate;
  width: 100%;
  flex-shrink: 0;
  min-height: clamp(540px, 70vh, 680px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: var(--asphalt-900);
  overflow: hidden;
}
.hero-manual__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-manual__media picture,
.hero-manual__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}
.hero-manual__media img {
  filter: contrast(1.05) saturate(.9);
}
.hero-manual__media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(to top, rgba(27,29,33,.94) 0%, rgba(27,29,33,.45) 42%, rgba(27,29,33,.55) 100%);
}
.hero-manual__content {
  position: relative;
  z-index: 2;
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 5.5rem 0 1.75rem;
}
.hero-kicker {
  font-family: var(--font-display);
  font-size: .95rem;
  letter-spacing: .28em;
  color: var(--amber-caution);
  margin-bottom: .75rem;
}
.hero-manual h1 {
  font-family: var(--font-body);
  font-weight: 900;
  font-size: clamp(1.85rem, 4.5vw, 3.1rem);
  color: var(--white);
  line-height: 1.25;
  letter-spacing: .02em;
  max-width: 16em;
  margin-bottom: .85rem;
}
.hero-lead {
  color: var(--chrome-grey);
  max-width: 36em;
  margin-bottom: 1.5rem;
  font-size: 1rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1.25rem; }
.hero-manual .btn-ghost {
  color: var(--white);
  border-color: var(--chrome-grey);
}
.hero-manual .btn-ghost:hover {
  color: var(--amber-caution);
  border-color: var(--amber-caution);
}
.hero-spec-strip {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
  flex-shrink: 0;
  margin-top: auto;
  background: rgba(27,29,33,.96);
  border-top: 2px solid var(--signal-red);
}
.hero-stat {
  padding: 1rem 1.25rem;
  border-right: 1px solid var(--steel-700);
}
.hero-stat:last-child { border-right: 0; }
.hero-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(.95rem, 2.5vw, 1.15rem);
  color: #FF6A45;
  font-weight: 600;
  line-height: 1.35;
  opacity: 1;
  transition: none;
}
.hero-stat__label {
  font-size: .78rem;
  color: var(--chrome-grey);
  margin-top: .35rem;
}

/* —— Sections / tiles —— */
.section { padding: 4rem 0; }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.section-kicker {
  font-family: var(--font-display);
  letter-spacing: .2em;
  font-size: .85rem;
  color: var(--signal-red);
  margin-bottom: .35rem;
}
.section-title {
  font-weight: 900;
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  letter-spacing: .02em;
}
.category-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 860px) {
  .category-grid { grid-template-columns: repeat(4, 1fr); }
}
.cat-tile {
  background: var(--white);
  border: 1px solid var(--chrome-grey);
  padding: 1.35rem 1.2rem;
  color: inherit;
  transition: border-color .25s, transform .25s, box-shadow .25s;
  display: block;
}
.cat-tile:hover {
  border-color: var(--signal-red);
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(27,29,33,.08);
  color: inherit;
}
.cat-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--asphalt-900);
  color: var(--signal-red);
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  margin-bottom: .9rem;
}
.cat-tile h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: .4rem;
}
.cat-tile p { font-size: .85rem; color: var(--text-mute); line-height: 1.6; }

.article-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) {
  .article-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .article-grid { grid-template-columns: repeat(3, 1fr); }
}
.card {
  background: var(--white);
  border: 1px solid var(--chrome-grey);
  display: flex;
  flex-direction: column;
  color: inherit;
  transition: border-color .25s;
}
.card:hover { border-color: var(--signal-red); color: inherit; }
.card__img {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--paper-100);
}
.card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--ease);
}
.card:hover .card__img img { transform: scale(1.04); }
.card__body { padding: 1.1rem 1.15rem 1.25rem; flex: 1; display: flex; flex-direction: column; }
.card__badge {
  display: inline-block;
  align-self: start;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
  background: var(--amber-caution);
  color: var(--asphalt-900);
  padding: .2rem .5rem;
  margin-bottom: .55rem;
}
.card__title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: .45rem;
}
.card__excerpt {
  font-size: .85rem;
  color: var(--text-mute);
  line-height: 1.65;
  flex: 1;
}

.compare-scroll {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: .75rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.compare-card {
  flex: 0 0 min(300px, 85vw);
  scroll-snap-align: start;
  background: var(--asphalt-900);
  color: var(--white);
  padding: 1.25rem;
  border-left: 3px solid var(--signal-red);
  text-decoration: none;
  transition: transform .25s;
}
.compare-card:hover { transform: translateY(-3px); color: var(--white); }
.compare-card h3 { font-size: 1.1rem; margin-bottom: .4rem; }
.compare-card p { font-size: .85rem; color: var(--chrome-grey); }

.trust-strip {
  background: var(--paper-100);
  border-block: 1px solid var(--chrome-grey);
  padding: 2rem 0;
}
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  align-items: center;
  justify-content: space-between;
}
.trust-inner p { color: var(--text-mute); font-size: .9rem; max-width: 40em; }
.trust-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.trust-links a {
  font-weight: 700;
  color: var(--asphalt-900);
  border-bottom: 2px solid var(--signal-red);
  padding-bottom: .15rem;
}

/* —— Article layout —— */
.article-layout {
  display: grid;
  gap: 2rem;
  padding: 1.5rem 0 4rem;
}
@media (min-width: 960px) {
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}
.article-main {
  background: var(--white);
  border: 1px solid var(--chrome-grey);
  padding: 1.5rem 1.25rem 2.5rem;
}
@media (min-width: 700px) {
  .article-main { padding: 2rem 2.25rem 3rem; }
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .5rem;
  font-size: .78rem;
  color: var(--text-mute);
  margin-bottom: 1rem;
}
.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: .5rem;
  color: var(--chrome-grey);
}
.breadcrumb a { color: var(--text-mute); }
.breadcrumb a:hover { color: var(--signal-red); }

.article-main h1 {
  font-weight: 900;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.35;
  margin-bottom: .5rem;
  letter-spacing: .01em;
}
.article-meta {
  font-size: .8rem;
  color: var(--text-mute);
  margin-bottom: .5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}
.article-meta time {
  font-family: var(--font-mono);
  font-size: .78rem;
}

.article-body h2 {
  font-weight: 900;
  font-size: 1.25rem;
  margin: 2.25rem 0 .85rem;
  padding-top: .5rem;
  border-top: 1px solid var(--chrome-grey);
}
.article-body h2:first-of-type { border-top: 0; padding-top: 0; }
.article-body h3 {
  font-weight: 700;
  font-size: 1.05rem;
  margin: 1.5rem 0 .6rem;
}
.article-body p { margin-bottom: 1rem; color: var(--text); }
.article-body ul, .article-body ol {
  margin: 0 0 1.1rem 1.2rem;
  list-style: disc;
}
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: .4rem; }
.article-body li::marker { color: var(--signal-red); }
.article-body figure {
  margin: 1.5rem 0;
}
.article-body figcaption {
  font-size: .78rem;
  color: var(--text-mute);
  margin-top: .5rem;
}
.article-img {
  border: 1px solid var(--chrome-grey);
  background: var(--paper-100);
}
.article-img img { width: 100%; }
.video-embed {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--asphalt-900);
  margin: 1.75rem 0;
  border: 1px solid var(--chrome-grey);
}
.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Comparison table */
.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--chrome-grey);
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  min-width: 520px;
}
.spec-table thead th {
  position: sticky;
  top: 0;
  background: var(--asphalt-900);
  color: var(--white);
  font-weight: 700;
  text-align: left;
  padding: .75rem 1rem;
  font-size: .82rem;
  letter-spacing: .04em;
}
.spec-table td {
  padding: .7rem 1rem;
  border-bottom: 1px solid var(--chrome-grey);
  font-family: var(--font-mono);
  font-size: .82rem;
}
.spec-table td:first-child {
  font-family: var(--font-body);
  font-weight: 500;
  background: var(--paper-100);
}
.spec-table tbody tr:nth-child(even) td:not(:first-child) {
  background: var(--paper-50);
}
.spec-table tbody tr:nth-child(odd) td:not(:first-child) {
  background: var(--white);
}

.related-links {
  display: grid;
  gap: .65rem;
  margin: 1.5rem 0;
}
.related-links a {
  display: block;
  padding: .85rem 1rem;
  background: var(--paper-50);
  border: 1px solid var(--chrome-grey);
  color: var(--asphalt-900);
  font-weight: 700;
  font-size: .9rem;
}
.related-links a:hover { border-color: var(--signal-red); }

.cta-end {
  margin: 2.5rem 0 1.5rem;
  padding: 1.5rem;
  background: var(--asphalt-900);
  color: var(--white);
  border-left: 4px solid var(--signal-red);
}
.cta-end h2 { font-size: 1.2rem; margin-bottom: .5rem; color: var(--white); border: 0; padding: 0; }
.cta-end p { color: var(--chrome-grey); margin-bottom: 1rem; }
.handoff-card {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border: 1px dashed var(--chrome-grey);
  background: var(--paper-50);
}
.handoff-card h3 { font-size: 1rem; margin-bottom: .4rem; }
.handoff-card p { font-size: .88rem; color: var(--text-mute); margin-bottom: .9rem; }

/* FAQ */
.faq { margin-top: 2rem; }
.faq h2 { margin-bottom: 1rem; }
.faq details {
  border: 1px solid var(--chrome-grey);
  background: var(--paper-50);
  margin-bottom: .5rem;
  padding: .85rem 1rem;
}
.faq summary {
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "+";
  color: var(--signal-red);
  font-family: var(--font-mono);
  margin-right: .5rem;
}
.faq details[open] summary::before { content: "–"; }
.faq details p {
  margin: .75rem 0 0;
  font-size: .92rem;
  color: var(--text-mute);
}

/* Sidebar */
.article-sidebar { }
.sidebar-sticky {
  display: grid;
  gap: 1rem;
}
@media (min-width: 960px) {
  .sidebar-sticky {
    position: sticky;
    top: calc(var(--header-h) + 1rem);
  }
}
.sidebar-block {
  background: var(--white);
  border: 1px solid var(--chrome-grey);
  padding: 1.1rem;
}
.sidebar-title {
  font-size: .78rem;
  letter-spacing: .14em;
  font-family: var(--font-display);
  color: var(--signal-red);
  margin-bottom: .75rem;
}
.toc ol { display: grid; gap: .35rem; }
.toc a {
  color: var(--text-mute);
  font-size: .82rem;
  display: block;
  padding: .25rem 0 .25rem .5rem;
  border-left: 2px solid transparent;
}
.toc a:hover,
.toc a.is-active {
  color: var(--asphalt-900);
  border-left-color: var(--signal-red);
  font-weight: 700;
}
.popular-list { display: grid; gap: .55rem; }
.popular-list a {
  font-size: .85rem;
  color: var(--asphalt-900);
  font-weight: 500;
  line-height: 1.4;
}
.popular-list a:hover { color: var(--signal-red); }
.cta-card { background: var(--asphalt-900); border-color: var(--steel-700); color: var(--white); }
.cta-card .sidebar-title,
.cta-kicker { color: var(--amber-caution); }
.cta-title { font-size: 1.05rem; margin-bottom: .4rem; color: var(--white); }
.cta-card p { font-size: .85rem; color: var(--chrome-grey); margin-bottom: .9rem; }
.sidebar-form label {
  display: block;
  font-size: .75rem;
  margin-bottom: .35rem;
  color: var(--text-mute);
}
.sidebar-form input {
  width: 100%;
  padding: .6rem .7rem;
  border: 1px solid var(--chrome-grey);
  background: var(--paper-50);
  margin-bottom: .65rem;
}

/* Mobile TOC accordion */
.toc-mobile {
  display: none;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--chrome-grey);
  background: var(--paper-50);
}
.toc-mobile summary {
  padding: .85rem 1rem;
  font-weight: 700;
  cursor: pointer;
}
.toc-mobile .toc { padding: 0 1rem 1rem; }
@media (max-width: 959px) {
  .toc-block { display: none; }
  .toc-mobile { display: block; }
}

/* Forms (contact) */
.form-page {
  max-width: 640px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--chrome-grey);
  padding: 2rem 1.5rem;
}
.form-group { margin-bottom: 1.1rem; }
.form-group label {
  display: block;
  font-weight: 700;
  font-size: .85rem;
  margin-bottom: .35rem;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: .7rem .8rem;
  border: 1px solid var(--chrome-grey);
  background: var(--paper-50);
}
.form-group textarea { min-height: 140px; resize: vertical; }

/* Footer */
.site-footer {
  background: var(--asphalt-900);
  color: var(--chrome-grey);
  padding-top: 3rem;
  margin-top: auto;
}
.footer-inner {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  display: grid;
  gap: 2rem;
}
@media (min-width: 800px) {
  .footer-inner { grid-template-columns: 1.3fr 2fr; }
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: .06em;
}
.footer-logo span { color: var(--signal-red); }
.footer-tagline { color: var(--amber-caution); font-size: .85rem; margin: .35rem 0 .75rem; }
.footer-about { font-size: .88rem; line-height: 1.7; max-width: 32em; }
.footer-cols {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}
.footer-cols h3 {
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--signal-red);
  margin-bottom: .75rem;
  font-family: var(--font-display);
}
.footer-cols a { color: var(--chrome-grey); font-size: .88rem; }
.footer-cols a:hover { color: var(--white); }
.footer-cols li { margin-bottom: .4rem; }
.footer-contact { font-size: .85rem; line-height: 1.7; }
.footer-bottom {
  width: min(var(--max), calc(100% - 2rem));
  margin: 2.5rem auto 0;
  padding: 1.25rem 0 1.75rem;
  border-top: 1px solid var(--steel-700);
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: space-between;
  font-size: .78rem;
}
.footer-trust a { color: var(--chrome-grey); }
.footer-trust a:hover { color: var(--amber-caution); }

/* Reveal */
/* Reveal — smooth once, never loops */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Tech diagram */
.diagram {
  background: var(--paper-100);
  border: 1px solid var(--chrome-grey);
  padding: 1.25rem;
  margin: 1.25rem 0;
}
.diagram svg { width: 100%; height: auto; max-width: 520px; margin: 0 auto; display: block; }

/* Page hero simple */
.page-hero {
  background: var(--asphalt-900);
  color: var(--white);
  padding: 2.5rem 0;
  border-bottom: 3px solid var(--signal-red);
}
.page-hero h1 {
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin-bottom: .5rem;
}
.page-hero p { color: var(--chrome-grey); max-width: 40em; }

/* —— Photo gallery strip —— */
.photo-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .5rem;
}
@media (min-width: 600px) {
  .photo-gallery { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 960px) {
  .photo-gallery { grid-template-columns: repeat(5, 1fr); gap: .65rem; }
}
.photo-gallery a,
.photo-gallery figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/4;
  background: var(--asphalt-900);
  border: 1px solid var(--chrome-grey);
}
.photo-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s var(--ease);
}
.photo-gallery a:hover img { transform: scale(1.06); }
.photo-gallery figcaption {
  position: absolute;
  inset: auto 0 0;
  padding: .65rem .55rem;
  background: linear-gradient(transparent, rgba(27,29,33,.88));
  color: var(--white);
  font-size: .68rem;
  letter-spacing: .04em;
}

/* Category tiles with photos */
.cat-tile--photo {
  position: relative;
  min-height: 200px;
  padding: 0;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  color: var(--white);
}
.cat-tile--photo:hover { color: var(--white); }
.cat-tile--photo .cat-bg {
  position: absolute;
  inset: 0;
}
.cat-tile--photo .cat-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s var(--ease);
}
.cat-tile--photo:hover .cat-bg img { transform: scale(1.05); }
.cat-tile--photo .cat-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(27,29,33,.92) 0%, rgba(27,29,33,.35) 100%);
}
.cat-tile--photo .cat-content {
  position: relative;
  z-index: 1;
  padding: 1.25rem 1.15rem;
}
.cat-tile--photo .cat-icon {
  background: var(--signal-red);
  color: var(--white);
}
.cat-tile--photo p { color: var(--chrome-grey); }

/* Compare cards with photo */
.compare-card--photo {
  position: relative;
  padding: 0;
  min-height: 220px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-left: 0;
}
.compare-card--photo .cmp-bg {
  position: absolute;
  inset: 0;
}
.compare-card--photo .cmp-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.compare-card--photo .cmp-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(27,29,33,.94), rgba(27,29,33,.25));
  border-left: 3px solid var(--signal-red);
}
.compare-card--photo .cmp-body {
  position: relative;
  z-index: 1;
  padding: 1.25rem;
}

/* Article images */
.article-img {
  overflow: hidden;
}
.article-img picture,
.article-img img {
  width: 100%;
  aspect-ratio: var(--img-ratio, 16/9);
  object-fit: cover;
  display: block;
}
.article-img--square img { aspect-ratio: 1; }
.img-grid-2 {
  display: grid;
  gap: .75rem;
  margin: 1.5rem 0;
}
@media (min-width: 600px) {
  .img-grid-2 { grid-template-columns: 1fr 1fr; }
}
.table-hint {
  display: none;
  font-size: .75rem;
  color: var(--text-mute);
  margin-bottom: .35rem;
}
.table-wrap { position: relative; -webkit-overflow-scrolling: touch; }

/* Safe area + overflow guards */
html, body { overflow-x: hidden; max-width: 100%; }
body { min-height: 100dvh; display: flex; flex-direction: column; }
main { flex: 1; }
.btn, .nav-trigger, .nav-toggle { min-height: 44px; min-width: 44px; }
.nav-trigger { display: inline-flex; align-items: center; }

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .logo-tag { display: none; }
  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 0;
    background: var(--asphalt-900);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1rem calc(1rem + env(safe-area-inset-bottom));
    gap: .5rem;
    transform: translateX(100%);
    transition: transform .35s var(--ease);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .primary-nav.is-open { transform: none; }
  .nav-list { flex-direction: column; align-items: stretch; }
  .nav-trigger {
    width: 100%;
    justify-content: space-between;
    text-align: left;
    padding: .9rem 1rem;
    border-bottom: 1px solid var(--steel-700);
  }
  .mega {
    position: static;
    display: none;
    padding: 0;
    min-width: 0;
  }
  .has-mega.is-open .mega { display: block; }
  .mega-inner { box-shadow: none; border: 0; background: var(--steel-700); }
  .primary-nav > .btn-cta { width: 100%; margin-top: .5rem; flex-shrink: 0; }
  .spec-bar { grid-template-columns: repeat(2, 1fr); }
  .spec-item:nth-child(2n) { border-right: 0; }
  .spec-item:nth-child(-n+2) { border-bottom: 1px solid var(--steel-700); }
  .hero-manual {
    min-height: clamp(480px, 68svh, 640px);
  }
  .hero-manual__content { padding: 4.75rem 0 1.25rem; }
  .hero-manual h1 { font-size: clamp(1.55rem, 7vw, 2.2rem); }
  .hero-spec-strip { grid-template-columns: 1fr; }
  .hero-stat { border-right: 0; border-bottom: 1px solid var(--steel-700); }
  .hero-stat:last-child { border-bottom: 0; }
  .category-grid { grid-template-columns: 1fr; }
  .section { padding: 2.75rem 0; }
  .section-head { margin-bottom: 1.25rem; }
  .article-main { padding: 1.15rem 1rem 2rem; }
  .table-hint { display: block; }
  .compare-scroll {
    margin-inline: -1rem;
    padding-inline: 1rem;
  }
  .trust-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 600px) {
  :root { --header-h: 60px; }
  body { font-size: 15px; }
  .container { width: min(var(--max), calc(100% - 1.25rem)); }
  .header-bar { width: min(var(--max), calc(100% - 1.25rem)); }
  .logo-mark { font-size: 1.2rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .card__body { padding: 1rem; }
  .spec-bar--mini { grid-template-columns: 1fr; }
  .spec-bar--mini .spec-item {
    border-right: 0;
    border-bottom: 1px solid var(--steel-700);
  }
  .spec-bar--mini .spec-item:last-child { border-bottom: 0; }
  .footer-cols { grid-template-columns: 1fr; }
  .page-hero { padding: 1.75rem 0; }
  .form-page { padding: 1.25rem 1rem; }
  .cta-end { padding: 1.15rem; }
}

@media (max-width: 480px) {
  .spec-bar { grid-template-columns: 1fr; }
  .spec-item { border-right: 0; border-bottom: 1px solid var(--steel-700); }
  .spec-item:last-child { border-bottom: 0; }
  .photo-gallery { gap: .35rem; }
}

@media (max-width: 360px) {
  .hero-kicker { letter-spacing: .16em; font-size: .8rem; }
  .cat-tile--photo { min-height: 180px; }
}

/* Tablet landscape / small laptop */
@media (min-width: 901px) and (max-width: 1100px) {
  .nav-list { gap: 0; }
  .nav-trigger { padding: .65rem .55rem; font-size: .82rem; }
  .logo-tag { max-width: 9em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
}

/* Large screens */
@media (min-width: 1400px) {
  :root { --max: 1240px; }
}

/* Print (SEO / accessibility) */
@media print {
  .site-header, .site-footer, .article-sidebar, .nav-toggle, .hero-actions, .btn { display: none !important; }
  .article-layout { display: block; }
  body { background: #fff; color: #000; }
  a[href]::after { content: " (" attr(href) ")"; font-size: .8em; }
}

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