/* ═══════════════════════════════════════════════════════
   CS HYDRO GROUP — SHARED STYLESHEET
   Colors: Blue #0080D0 · Deep #004080 · Black #000000
           Charcoal #2A2D34 · Chrome #C0C0C0 · Fog #F5F5F2
           Gray #6B7280 · Orange #FF6A13
   Fonts:  Barlow Condensed (display) · Inter (body)
═══════════════════════════════════════════════════════ */

/* ── TOKENS ─────────────────────────────────────────── */
:root {
  --blue:     #0080D0;
  --deep:     #004080;
  --black:    #000000;
  --charcoal: #2A2D34;
  --chrome:   #C0C0C0;
  --fog:      #F5F5F2;
  --gray:     #6B7280;
  --orange:   #FF6A13;
  --white:    #FFFFFF;

  --display: 'Barlow Condensed', Oswald, Arial, sans-serif;
  --body:    'Inter', Arial, sans-serif;

  --max-w: 1160px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

/* ── RESET ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html  { scroll-behavior: smooth; }
img   { display: block; max-width: 100%; }
ul    { list-style: none; }
a     { color: inherit; text-decoration: none; }

/* ── BASE ────────────────────────────────────────────── */
body {
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.45;
  color: var(--charcoal);
  background: var(--fog);
}

/* ── TYPOGRAPHY SCALE ────────────────────────────────── */
.d-hero {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(3.5rem, 9vw, 7.5rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 0.93;
}
.d1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  line-height: 0.95;
}
.d2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  line-height: 1;
}
.d3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1rem, 1.8vw, 1.4rem);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.1;
}
.label {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
.body-lg {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.6;
}
.body-sm {
  font-size: 0.875rem;
  line-height: 1.55;
}

/* ── LAYOUT ──────────────────────────────────────────── */
.wrap {
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.wrap--narrow {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* Section spacing */
.section { padding-top: clamp(4rem, 8vw, 7rem); padding-bottom: clamp(4rem, 8vw, 7rem); }
.section--sm { padding-top: clamp(2.5rem, 4vw, 4rem); padding-bottom: clamp(2.5rem, 4vw, 4rem); }
.section--lg { padding-top: clamp(5rem, 10vw, 9rem); padding-bottom: clamp(5rem, 10vw, 9rem); }

/* Section backgrounds */
.bg-black    { background: var(--black); color: var(--fog); }
.bg-charcoal { background: var(--charcoal); color: var(--fog); }
.bg-deep     { background: var(--deep); color: var(--fog); }
.bg-blue     { background: var(--blue); color: var(--white); }
.bg-fog      { background: var(--fog); color: var(--charcoal); }
.bg-white    { background: var(--white); color: var(--charcoal); }

/* ── DIVIDERS ─────────────────────────────────────────── */
.rule { width: 48px; height: 3px; background: var(--blue); }
.rule--full { width: 100%; height: 1px; background: rgba(255,255,255,0.1); }
.rule--dark { background: rgba(0,0,0,0.12); }

/* ── EYEBROW / SECTION LABEL ─────────────────────────── */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.eyebrow__text {
  font-family: var(--display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  white-space: nowrap;
}
.eyebrow__line {
  flex: 1;
  height: 1px;
  background: currentColor;
  opacity: 0.15;
}
.eyebrow--light .eyebrow__text { color: var(--blue); }
.eyebrow--on-dark .eyebrow__text { color: var(--blue); }

/* ── BUTTONS ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.85rem 1.75rem 0.8rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.btn--primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn--primary:hover { background: var(--deep); border-color: var(--deep); }

.btn--outline-white {
  background: transparent;
  color: var(--fog);
  border-color: rgba(245,245,242,0.4);
}
.btn--outline-white:hover {
  background: rgba(245,245,242,0.08);
  border-color: var(--fog);
}
.btn--outline-dark {
  background: transparent;
  color: var(--charcoal);
  border-color: rgba(42,45,52,0.4);
}
.btn--outline-dark:hover {
  background: var(--charcoal);
  color: var(--fog);
  border-color: var(--charcoal);
}
.btn-group { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* ── NAV ─────────────────────────────────────────────── */
.site-nav {
  background: var(--black);
  border-bottom: 2px solid var(--blue);
  position: sticky;
  top: 0;
  z-index: 200;
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 2rem;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}
.nav-brand img { width: 44px; height: auto; }
.nav-brand__text { display: flex; flex-direction: column; gap: 1px; }
.nav-brand__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fog);
  line-height: 1;
}
.nav-brand__sub {
  font-size: 0.55rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chrome);
  font-family: var(--display);
  font-weight: 600;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--chrome);
  transition: color 0.15s;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--fog); }
.nav-links a.active { color: var(--blue); border-bottom-color: var(--blue); }
.nav-links .btn { margin-left: 0.5rem; padding: 0.6rem 1.25rem 0.55rem; }

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--fog);
  transition: transform 0.2s;
}

/* ── FOOTER ──────────────────────────────────────────── */
.site-footer {
  background: var(--black);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 3rem;
  padding-bottom: 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand img { width: 52px; margin-bottom: 1rem; }
.footer-brand__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fog);
  margin-bottom: 0.4rem;
}
.footer-brand p { font-size: 0.83rem; color: var(--gray); line-height: 1.6; }
.footer-col h4 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1rem;
}
.footer-col ul li + li { margin-top: 0.5rem; }
.footer-col ul li a {
  font-size: 0.88rem;
  color: var(--gray);
  transition: color 0.15s;
}
.footer-col ul li a:hover { color: var(--fog); }
.footer-col p { font-size: 0.88rem; color: var(--gray); line-height: 1.65; }
.footer-col a:hover { color: var(--fog); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-wrap: wrap;
  gap: 0.75rem;
}
.footer-badges { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.badge {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 9px 2px;
  border: 1px solid rgba(255,255,255,0.18);
  color: var(--chrome);
}
.footer-copy { font-size: 0.78rem; color: var(--gray); }

/* ── TAG CHIP ─────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px 2px;
  background: var(--deep);
  color: var(--fog);
  margin-bottom: 1rem;
}
.tag--blue  { background: var(--blue); }
.tag--orange { background: var(--orange); }

/* ── SPEC TABLE ──────────────────────────────────────── */
.spec-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 1.75rem;
}
.spec-card--dark {
  background: rgba(0,0,0,0.15);
  border-color: rgba(0,0,0,0.12);
}
.spec-card .label { color: var(--blue); margin-bottom: 1rem; display: block; }
.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.spec-row:last-child { border-bottom: none; }
.spec-key {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--chrome);
  flex-shrink: 0;
}
.spec-val { font-size: 0.9rem; color: var(--fog); text-align: right; }

/* ── CHIP LIST ───────────────────────────────────────── */
.chip-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1rem; }
.chip {
  font-size: 0.75rem;
  padding: 4px 10px;
  border: 1px solid rgba(255,255,255,0.14);
  color: rgba(245,245,242,0.65);
}
.chip--dark {
  border-color: rgba(0,0,0,0.15);
  color: var(--gray);
}

/* ── FORMS ───────────────────────────────────────────── */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.form-grid--full { grid-template-columns: 1fr; }
.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field label {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue);
}
.field input,
.field select,
.field textarea {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--fog);
  font-family: var(--body);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color 0.15s;
  border-radius: 0;
  -webkit-appearance: none;
}
.field input::placeholder,
.field textarea::placeholder { color: rgba(245,245,242,0.3); }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--blue);
  background: rgba(0,128,208,0.05);
}
.field select option { background: var(--charcoal); color: var(--fog); }
.field textarea { resize: vertical; min-height: 140px; }

/* ── UTILITIES ───────────────────────────────────────── */
.text-blue    { color: var(--blue); }
.text-chrome  { color: var(--chrome); }
.text-gray    { color: var(--gray); }
.text-muted   { color: rgba(245,245,242,0.55); }
.text-muted-dark { color: rgba(42,45,52,0.55); }
.mb-xs { margin-bottom: 0.5rem; }
.mb-sm { margin-bottom: 1rem; }
.mb-md { margin-bottom: 1.75rem; }
.mb-lg { margin-bottom: 2.5rem; }
.mb-xl { margin-bottom: 4rem; }

/* ── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 680px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--black);
    padding: 1.5rem var(--gutter) 2rem;
    border-bottom: 2px solid var(--blue);
    gap: 1.25rem;
    align-items: flex-start;
  }
  .nav-links.open .btn { margin-left: 0; }
  .nav-toggle { display: flex; }
  .site-nav { position: relative; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}