@import url("fonts.css");

/* ============================================================
   Hydrotechnics — design tokens
   ============================================================ */
:root {
  --bg:          #f5f7f9;
  --bg-deep:     #eaeff3;
  --paper:       #ffffff;
  --ink:         #0d1620;
  --ink-2:       #16232f;
  --body:        #4c5c69;
  --muted:       #67757f;
  --brand:       #0a7ea4;
  --brand-deep:  #075f7c;
  --brand-bright:#16b8dc;
  --brand-soft:  #e3f2f7;
  --line:        #dfe6eb;
  --line-soft:   #edf1f4;

  --shadow-sm: 0 1px 2px rgba(13,22,32,.06), 0 2px 8px rgba(13,22,32,.05);
  --shadow-md: 0 4px 14px rgba(13,22,32,.07), 0 16px 44px rgba(13,22,32,.09);

  --display: "Manrope", "Helvetica Neue", Arial, sans-serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --gutter: clamp(1.15rem, 4.5vw, 3.25rem);
  --wrap: 1220px;
  --radius: 3px;
  --radius-lg: 6px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 82px;
  /* A sideways-scrollable page moves position:fixed elements out of view on
     phones. Clip rather than scroll, so one stray wide element cannot break
     the header. (clip, not hidden: hidden would make html a scroll container
     and break scroll-padding / sticky.) */
  overflow-x: clip;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body.is-locked { overflow: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); text-underline-offset: 3px; }
a:hover { color: var(--brand-deep); }
h1, h2, h3, h4 { color: var(--ink); font-family: var(--display); font-weight: 800; line-height: 1.12; margin: 0; letter-spacing: -.025em; }
p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }
ul { margin: 0; padding: 0; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important; animation-iteration-count: 1 !important;
    transition-duration: .01ms !important; scroll-behavior: auto !important;
  }
}

.skip-link {
  position: absolute; left: 1rem; top: -100px; z-index: 200;
  background: var(--brand); color: #fff; padding: .7rem 1.1rem;
  border-radius: var(--radius); font-size: .875rem; font-weight: 600; text-decoration: none;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 1rem; color: #fff; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ============================================================
   Layout
   ============================================================ */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.section--paper { background: var(--paper); }
.section--deep { background: var(--ink); color: #a9b8c4; }
.section--tint { background: var(--bg-deep); }

.section-head { max-width: 48rem; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: flex; align-items: center; gap: .7rem;
  font-size: .7rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 1rem;
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--brand-bright); flex-shrink: 0; }
.section-head--center .eyebrow { justify-content: center; }
.section-title { font-size: clamp(1.85rem, 4vw, 2.85rem); }
.lede { font-size: clamp(1rem, 1.3vw, 1.1rem); margin-top: 1rem; }

/* ============================================================
   Buttons
   ============================================================ */
.btn { background:transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: .6rem;
  padding: .9rem 1.6rem; border-radius: var(--radius); border: 2px solid transparent;
  font-family: var(--display); font-size: .875rem; font-weight: 700; letter-spacing: .01em;
  text-decoration: none; cursor: pointer;
  transition: background-color .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease), box-shadow .22s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn--primary { background: var(--brand); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--brand-deep); color: #fff; box-shadow: var(--shadow-md); }
.btn--outline { border-color: var(--line); color: var(--ink); background: var(--paper); }
.btn--outline:hover { border-color: var(--brand); color: var(--brand); }
.btn--ghost { border-color: rgba(255,255,255,.35); color: #fff; }
.btn--ghost:hover { background: #fff; border-color: #fff; color: var(--ink); }
.btn--lg { padding: 1.05rem 2rem; font-size: .95rem; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(255,255,255,.9); backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line-soft);
  transition: box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.site-header.is-stuck { box-shadow: 0 1px 18px rgba(13,22,32,.08); }
.header-inner { display: flex; align-items: center; gap: 1.25rem; min-height: 72px; position: relative; }

.brand { display: inline-flex; align-items: center; margin-right: auto; text-decoration: none; }
.brand img { height: 30px; width: auto; }

.nav { display: flex; align-items: center; gap: clamp(.9rem, 1.8vw, 1.75rem); }
.nav a {
  position: relative; font-family: var(--display); font-size: .85rem; font-weight: 700;
  text-decoration: none; color: var(--ink); padding-block: .3rem;
  transition: color .2s var(--ease);
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: var(--brand-bright); transform: scaleX(0); transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav a:hover { color: var(--brand); }
.nav a:hover::after, .nav a[aria-current="true"]::after { transform: scaleX(1); }

.header-side { display: flex; align-items: center; gap: .75rem; margin-left: clamp(.9rem, 2vw, 1.75rem); }
.header-phone {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--display); font-weight: 800; font-size: .95rem;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.header-phone svg { width: 17px; height: 17px; stroke: var(--brand); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.header-phone:hover { color: var(--brand); }
.icon-link { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: var(--radius); border: 1px solid var(--line); color: var(--ink); transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease); }
.icon-link svg { width: 16px; height: 16px; fill: currentColor; }
.icon-link:hover { background: var(--brand); border-color: var(--brand); color: #fff; }

.nav-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; cursor: pointer; padding: 0; align-items: center; justify-content: center; }
.nav-toggle span { display: block; width: 21px; height: 2px; background: var(--ink); position: relative; transition: background-color .2s var(--ease); }
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; width: 21px; height: 2px; background: var(--ink); transition: transform .3s var(--ease), top .2s var(--ease); }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.site-header.is-open .nav-toggle span { background: transparent; }
.site-header.is-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
.site-header.is-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .header-side .btn, .header-phone span { display: none; }
  .nav {
    position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper); border-top: 1px solid var(--line-soft);
    padding: .25rem var(--gutter) 1.25rem;
    max-height: 0; overflow: hidden; visibility: hidden;
    transition: max-height .35s var(--ease), visibility .35s;
  }
  .site-header.is-open .nav { max-height: 70vh; visibility: visible; overflow-y: auto; }
  .nav a { font-size: 1rem; padding: .8rem 0; border-bottom: 1px solid var(--line-soft); }
  .nav a::after { display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero { position: relative; padding-top: clamp(8rem, 16vh, 11rem); padding-bottom: clamp(3.5rem, 8vw, 6rem); overflow: hidden; background: var(--bg-deep); }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center 40%; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(105deg, rgba(245,247,249,.97) 0%, rgba(245,247,249,.93) 38%, rgba(245,247,249,.72) 62%, rgba(245,247,249,.5) 100%);
}
.hero-inner { position: relative; z-index: 1; max-width: 45rem; }
.hero-tag {
  display: inline-flex; align-items: center; gap: .55rem; margin-bottom: 1.5rem;
  background: var(--paper); border: 1px solid var(--line); border-radius: 999px;
  padding: .4rem .95rem .4rem .55rem; font-size: .78rem; font-weight: 600; color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: #24b47e; box-shadow: 0 0 0 3px rgba(36,180,126,.2); }
.hero h1 { font-size: clamp(2.3rem, 6.4vw, 4.15rem); letter-spacing: -.035em; }
.hero h1 .accent { color: var(--brand); }
.hero-sub { margin-top: 1.25rem; font-size: clamp(1.05rem, 1.7vw, 1.3rem); font-family: var(--display); font-weight: 600; color: var(--ink-2); line-height: 1.45; letter-spacing: -.01em; }
.hero-areas { margin-top: 1rem; font-size: 1rem; max-width: 38rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 2rem; }

/* ============================================================
   Trust strip
   ============================================================ */
.strip { background: var(--ink); }
.strip-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.strip-item { padding: clamp(1.4rem, 2.6vw, 2rem) clamp(.9rem, 1.8vw, 1.6rem); border-left: 1px solid rgba(255,255,255,.1); }
.strip-item:first-child { border-left: 0; }
.strip-item dt { font-size: .66rem; letter-spacing: .15em; text-transform: uppercase; color: #7d8fa0; margin-bottom: .45rem; }
.strip-item dd { margin: 0; font-family: var(--display); font-weight: 800; font-size: clamp(1.05rem, 1.9vw, 1.35rem); color: #fff; letter-spacing: -.02em; line-height: 1.25; }
@media (max-width: 780px) {
  .strip-grid { grid-template-columns: repeat(2, 1fr); }
  .strip-item:nth-child(odd) { border-left: 0; }
  .strip-item:nth-child(n+3) { border-top: 1px solid rgba(255,255,255,.1); }
}

/* ============================================================
   Intro
   ============================================================ */
.intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
@media (max-width: 900px) { .intro { grid-template-columns: 1fr; } }
.intro-body p + p { margin-top: 1.05em; }

/* ============================================================
   Services
   ============================================================ */
.services { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: clamp(1rem, 2vw, 1.6rem); }
.service {
  position: relative; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden; display: flex; flex-direction: column;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.service:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--brand-bright); }
.service-img { aspect-ratio: 16 / 10; overflow: hidden; background: var(--bg-deep); }
.service-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.service:hover .service-img img { transform: scale(1.06); }
.service-body { padding: 1.4rem 1.5rem 1.6rem; flex: 1; }
.service-num { font-family: var(--display); font-size: .72rem; font-weight: 800; letter-spacing: .1em; color: var(--brand-bright); }
.service h3 { font-size: 1.22rem; margin-top: .4rem; }
.service p { font-size: .9rem; margin-top: .6rem; }

/* ============================================================
   Promises
   ============================================================ */
.promises { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.promise { background: var(--paper); padding: clamp(1.6rem, 3vw, 2.3rem); }
.promise svg { width: 28px; height: 28px; stroke: var(--brand); fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 1rem; }
.promise h3 { font-size: 1.15rem; }
.promise p { font-size: .9rem; margin-top: .6rem; }

/* ============================================================
   Reviews
   ============================================================ */
.reviews { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: clamp(1rem, 2vw, 1.6rem); }
.review {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2rem); display: flex; flex-direction: column;
}
.stars { display: flex; gap: 2px; margin-bottom: 1rem; }
.stars svg { width: 15px; height: 15px; fill: #f2a93b; }
.review blockquote { margin: 0; font-size: .98rem; color: var(--ink-2); line-height: 1.65; }
.review-by { margin-top: auto; padding-top: 1.25rem; display: flex; align-items: center; gap: .8rem; }
.avatar {
  width: 40px; height: 40px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand-deep);
  font-family: var(--display); font-weight: 800; font-size: .88rem; letter-spacing: -.02em;
}
.review-by .who { font-family: var(--display); font-weight: 700; font-size: .9rem; color: var(--ink); line-height: 1.3; }
.review-by .where { font-size: .78rem; color: var(--muted); }

/* ============================================================
   Gallery
   ============================================================ */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr)); gap: clamp(.5rem, 1vw, .85rem); }
.tile {
  position: relative; display: block; padding: 0; border: 0; cursor: zoom-in;
  overflow: hidden; border-radius: var(--radius); background: var(--bg-deep); aspect-ratio: 1 / 1;
}
.tile img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.tile:hover img, .tile:focus-visible img { transform: scale(1.06); }
.tile::after {
  content: ""; position: absolute; inset: 0; opacity: 0;
  background: linear-gradient(to top, rgba(13,22,32,.45), transparent 60%);
  transition: opacity .35s var(--ease);
}
.tile:hover::after, .tile:focus-visible::after { opacity: 1; }
.tile[hidden] { display: none; }
.tile.is-entering { animation: tileIn .4s var(--ease) both; }
@keyframes tileIn { from { opacity: 0; transform: scale(.97); } to { opacity: 1; transform: none; } }
.gallery-more { display: flex; justify-content: center; margin-top: 1.75rem; }

/* ============================================================
   Areas
   ============================================================ */
.areas { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.5rem; list-style: none; }
.areas li {
  background: var(--paper); border: 1px solid var(--line); border-radius: 999px;
  padding: .45rem 1rem; font-size: .85rem; font-weight: 500; color: var(--ink-2);
}
.areas li.is-base { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }

/* ============================================================
   Contact
   ============================================================ */
.contact { background: var(--ink); color: #a9b8c4; position: relative; overflow: hidden; }
.contact::before {
  content: ""; position: absolute; inset: 0; opacity: .12;
  background: url("../img/services/hero.jpeg") center/cover no-repeat;
}
.contact > .wrap { position: relative; z-index: 1; }
.contact .eyebrow { color: var(--brand-bright); }
.contact .eyebrow::before { background: var(--brand-bright); }
.contact .section-title { color: #fff; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-list { list-style: none; display: grid; gap: 1px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius-lg); overflow: hidden; }
.contact-list li { background: rgba(255,255,255,.045); padding: 1.05rem 1.35rem; display: flex; align-items: center; gap: 1rem; }
.contact-list svg { width: 19px; height: 19px; flex-shrink: 0; stroke: var(--brand-bright); fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.contact-list .label { display: block; font-size: .66rem; letter-spacing: .14em; text-transform: uppercase; color: #7d8fa0; }
.contact-list a, .contact-list .value { color: #fff; font-family: var(--display); font-weight: 700; font-size: 1.05rem; text-decoration: none; letter-spacing: -.01em; }
.contact-list a:hover { color: var(--brand-bright); }
.contact-list .value { font-size: .98rem; }
.contact-note { font-size: .92rem; }
.contact-note .btn { margin-top: 1.4rem; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { background: #08111a; color: #6f8090; padding-block: 2rem; font-size: .82rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; justify-content: space-between; }
.site-footer img { height: 24px; width: auto; opacity: .85; }
.site-footer a { color: #97a7b5; }
.site-footer a:hover { color: #fff; }
.footer-links { display: flex; gap: 1.25rem; list-style: none; flex-wrap: wrap; }

/* ============================================================
   Reveal
   ============================================================ */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* ============================================================
   Lightbox
   ============================================================ */
.lightbox { position: fixed; inset: 0; z-index: 300; display: none; background: rgba(6,12,18,.97); opacity: 0; transition: opacity .28s var(--ease); }
.lightbox.is-open { display: block; }
.lightbox.is-visible { opacity: 1; }
.lb-stage { position: absolute; inset: 0; display: grid; place-items: center; padding: clamp(3.5rem, 8vw, 5rem) clamp(1rem, 7vw, 5.5rem); }
.lb-figure { margin: 0; display: grid; place-items: center; gap: 1rem; max-width: 100%; max-height: 100%; }
.lb-img { max-width: 100%; max-height: calc(100svh - 11rem); width: auto; height: auto; object-fit: contain; border-radius: 2px; box-shadow: 0 24px 80px rgba(0,0,0,.55); transition: opacity .22s var(--ease); }
.lb-img.is-loading { opacity: .35; }
.lb-caption { color: rgba(255,255,255,.62); font-size: .82rem; text-align: center; max-width: 60ch; }
.lb-btn {
  position: absolute; z-index: 2; display: grid; place-items: center;
  width: 46px; height: 46px; border-radius: 50%; cursor: pointer;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
  color: #fff; backdrop-filter: blur(8px);
  transition: background-color .22s var(--ease), transform .22s var(--ease), opacity .22s var(--ease);
}
.lb-btn:hover { background: rgba(255,255,255,.22); }
.lb-btn:disabled { opacity: .25; cursor: default; }
.lb-btn svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.lb-close { top: clamp(1rem, 3vw, 1.7rem); right: clamp(1rem, 3vw, 1.7rem); }
.lb-prev { left: clamp(.6rem, 2.5vw, 1.7rem); top: 50%; transform: translateY(-50%); }
.lb-next { right: clamp(.6rem, 2.5vw, 1.7rem); top: 50%; transform: translateY(-50%); }
.lb-prev:hover, .lb-next:hover { transform: translateY(-50%) scale(1.06); }
.lb-counter { position: absolute; top: clamp(1rem, 3vw, 1.8rem); left: 50%; transform: translateX(-50%); font-size: .78rem; letter-spacing: .12em; color: rgba(255,255,255,.6); font-variant-numeric: tabular-nums; }
@media (max-width: 640px) {
  .lb-prev { left: .5rem; } .lb-next { right: .5rem; }
  .lb-btn { width: 42px; height: 42px; }
  .lb-img { max-height: calc(100svh - 9rem); }
}

/* ============================================================
   Sticky mobile call bar
   ============================================================ */
.callbar { display: none; }
@media (max-width: 700px) {
  .callbar {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 90;
    display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
    background: var(--line); border-top: 1px solid var(--line);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .callbar a {
    display: flex; align-items: center; justify-content: center; gap: .5rem;
    padding: .95rem .5rem; background: var(--paper); color: var(--ink);
    font-family: var(--display); font-weight: 700; font-size: .9rem; text-decoration: none;
  }
  .callbar a.primary { background: var(--brand); color: #fff; }
  .callbar svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
  body { padding-bottom: 3.6rem; }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  .site-header, .callbar, .lightbox, .gallery-more, .skip-link { display: none !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  body { background: #fff; color: #000; padding-bottom: 0; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: .75em; color: #555; }
}

/* [hidden] must win. A rule like `.gallery-more { display:flex }` outranks the
   browser's own `[hidden] { display:none }`, which left an empty "Show 0 more"
   button on screen whenever a gallery had nothing further to reveal. */
[hidden] { display: none !important; }


/* A <button> inherits the user agent's grey `buttonface` unless something says
   otherwise. An outline/ghost button that sets only border-color and color then
   renders as light-grey with (often white) text on it — invisible. Reset here;
   any variant that wants a fill sets one and wins on specificity. */
button { background: transparent; }