/* ============================================================
   HYDROTEC SERVICES — Candidate V3 "Engineering Editorial"
   Premium corporate, conversion-led. Mobile-first.
   Palette: Midnight Navy #0A1A2F · Technical Blue #2457E6
            Aqua #36BCC8 · Steel Grey #8795A1 · White
   Type:    Manrope (display) · Inter (body) · Noto Sans SC (accent)
   ============================================================ */

:root {
  --navy: #0A1A2F;
  --navy-2: #0E2240;            /* derived tint */
  --blue: #2457E6;
  --blue-deep: #1B45C0;         /* derived hover */
  --aqua: #36BCC8;
  --aqua-ink: #177E88;          /* derived: aqua dark enough for text on white */
  --steel: #8795A1;
  --ink: #16273D;               /* derived heading ink */
  --body: #3D4C61;              /* derived body text */
  --mist: #F4F7FA;              /* derived light band */
  --line: rgba(10, 26, 47, .12);
  --line-light: rgba(255, 255, 255, .14);
  --white: #FFFFFF;
}

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

html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font: 400 1rem/1.65 "Inter", system-ui, sans-serif;
  color: var(--body);
  background: var(--white);
  overflow-x: clip;
}

img, svg { max-width: 100%; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--blue-deep); }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 2px; }
.band-navy :focus-visible, .hero :focus-visible, .site-foot :focus-visible, .sticky-cta :focus-visible {
  outline-color: var(--aqua);
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--navy); color: #fff; padding: 10px 16px; font: 600 .9rem "Manrope", sans-serif;
}
.skip-link:focus { left: 0; }

/* ---------- Type system ---------- */
h1, h2, h3, h4 { font-family: "Manrope", system-ui, sans-serif; color: var(--ink); }

h1 {
  font-weight: 800;
  font-size: clamp(2.1rem, 5.5vw, 3.5rem);
  line-height: 1.07;
  letter-spacing: -.022em;
}
h2 {
  font-weight: 800;
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -.015em;
}
h3 { font-weight: 800; font-size: 1.12rem; line-height: 1.3; }

.eyebrow {
  font: 700 .72rem/1.4 "Manrope", sans-serif;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}
.band-navy .eyebrow, .hero .eyebrow { color: var(--aqua); }

.rule { width: 44px; height: 3px; background: var(--aqua); border-radius: 2px; margin-bottom: 20px; }

.lede { margin-top: 16px; font-size: 1.06rem; max-width: 620px; }
.sec-head { max-width: 700px; }
.sec-head h2 + .lede { margin-top: 14px; }

.zh { font-family: "Noto Sans SC", "Inter", sans-serif; font-weight: 500; }

/* ---------- Header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 16px; position: relative;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 30px; height: 30px; display: block; }
.wordmark {
  font: 800 1.02rem "Manrope", sans-serif; color: var(--navy);
  letter-spacing: .01em; white-space: nowrap;
}
.wordmark span {
  color: var(--blue); font-weight: 700; font-size: .7em;
  letter-spacing: .24em; margin-left: 7px;
}

.nav-toggle {
  font: 700 .8rem "Manrope", sans-serif; letter-spacing: .1em; text-transform: uppercase;
  background: none; border: 1px solid var(--line); border-radius: 6px;
  color: var(--navy); padding: 9px 14px; cursor: pointer;
}
.nav {
  display: none;
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--white); border-bottom: 1px solid var(--line);
  flex-direction: column; gap: 2px; padding: 10px 20px 18px;
}
.nav.open { display: flex; }
.nav a {
  font: 600 .95rem "Manrope", sans-serif; color: var(--ink);
  text-decoration: none; padding: 10px 2px;
}
.nav a:hover { color: var(--blue); }
.nav a.active { color: var(--blue); }
.nav .nav-cta {
  background: var(--blue); color: #fff; border-radius: 6px;
  padding: 10px 16px; text-align: center; margin-top: 8px;
}
.nav .nav-cta:hover { background: var(--blue-deep); color: #fff; }

@media (min-width: 880px) {
  .nav-toggle { display: none; }
  .nav {
    display: flex; position: static; flex-direction: row; align-items: center;
    gap: 28px; border: 0; padding: 0; background: none;
  }
  .nav a { padding: 6px 0; border-bottom: 2px solid transparent; }
  .nav a.active { border-bottom-color: var(--aqua); }
  .nav .nav-cta { margin-top: 0; padding: 9px 18px; border-bottom: 0; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  font: 700 .95rem/1 "Manrope", sans-serif;
  padding: .95rem 1.5rem; border-radius: 7px;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
}
.btn svg { flex: 0 0 auto; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); color: #fff; }
.btn-secondary { border-color: rgba(10, 26, 47, .28); color: var(--navy); background: transparent; }
.btn-secondary:hover { border-color: var(--navy); color: var(--navy); }
.btn-ghost-light { border-color: rgba(255, 255, 255, .38); color: #fff; background: transparent; }
.btn-ghost-light:hover { border-color: #fff; color: #fff; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.cta-row .btn { min-height: 48px; }         /* thumb-sized */
@media (max-width: 420px) { .cta-row .btn { flex: 1 1 100%; } }

/* ---------- Hero (Midnight Navy + schematic) ---------- */
.hero { background: var(--navy); color: #fff; position: relative; overflow: hidden; }
.hero .wrap { position: relative; z-index: 1; padding-top: 64px; padding-bottom: 56px; }
.hero-grid { display: grid; gap: 44px; align-items: center; }
.hero h1 { color: #fff; max-width: 15ch; }
.hero .lede { color: #B7C2CF; }
.hero-art { min-width: 0; }
.hero-art svg { width: 100%; height: auto; display: block; }

.trust-strip {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line-light);
  display: flex; flex-wrap: wrap; gap: 8px 26px;
  font-size: .8rem; color: var(--steel); letter-spacing: .02em;
}
.trust-strip b { color: #fff; font-weight: 600; }

@media (min-width: 960px) {
  .hero .wrap { padding-top: 88px; padding-bottom: 80px; }
  .hero-grid { grid-template-columns: 1.12fr .88fr; gap: 64px; }
}

/* ---------- Stats band ---------- */
.stats { background: var(--navy); border-top: 1px solid var(--line-light); color: #fff; }
.stats .wrap { display: grid; grid-template-columns: 1fr 1fr; }
.stat { padding: 26px 18px 26px 0; }
.stat b {
  display: block; font: 800 clamp(1.7rem, 4vw, 2.5rem)/1.1 "Manrope", sans-serif;
  color: #fff; letter-spacing: -.02em; font-variant-numeric: tabular-nums;
}
.stat span { display: block; margin-top: 6px; font-size: .82rem; color: var(--steel); }
@media (min-width: 760px) {
  .stats .wrap { grid-template-columns: repeat(4, 1fr); }
  .stat { padding: 36px 28px; border-left: 1px solid var(--line-light); }
  .stat:first-child { border-left: 0; padding-left: 0; }
}

/* ---------- Sections & bands ---------- */
.section { padding: 64px 0; }
.section-tight { padding: 48px 0 56px; }
.band-mist { background: var(--mist); }
.band-navy { background: var(--navy); color: #B7C2CF; }
.band-navy h2, .band-navy h3 { color: #fff; }
.band-navy .lede { color: #B7C2CF; }
@media (min-width: 880px) { .section { padding: 92px 0; } }

.page-head { padding: 56px 0 8px; }
@media (min-width: 880px) { .page-head { padding: 80px 0 8px; } }

/* ---------- Capability matrix (three arms) ---------- */
.arms { display: grid; gap: 20px; margin-top: 44px; }
.arm {
  background: var(--white); border: 1px solid var(--line); border-radius: 10px;
  padding: 28px 26px 22px; display: flex; flex-direction: column;
}
.arm.featured { border-top: 3px solid var(--aqua); }
.band-mist .arm { border-color: rgba(10, 26, 47, .1); }
.arm-label {
  font: 700 .68rem "Manrope", sans-serif; letter-spacing: .18em; text-transform: uppercase;
  color: var(--steel); margin-bottom: 10px;
}
.arm.featured .arm-label { color: var(--aqua-ink); }
.arm h3 { margin-bottom: 10px; }
.arm > p { font-size: .95rem; margin-bottom: 16px; }
.arm ul { list-style: none; margin-top: auto; }
.arm li {
  padding: 10px 0; border-top: 1px solid var(--line);
  font-size: .92rem; color: var(--body);
}
@media (min-width: 900px) { .arms { grid-template-columns: repeat(3, 1fr); } }

.tag {
  display: inline-block; font: 700 .64rem/1.5 "Manrope", sans-serif; letter-spacing: .08em;
  padding: 2px 8px; border-radius: 4px; margin-left: 6px; vertical-align: 1px;
  background: rgba(36, 87, 230, .1); color: var(--blue); white-space: nowrap;
}

/* ---------- Case-study rows (editorial) ---------- */
.cases { margin-top: 44px; }
.case-row { display: grid; gap: 4px; padding: 20px 0; border-top: 1px solid var(--line); }
.case-row:last-child { border-bottom: 1px solid var(--line); }
.case-site { font: 700 1.06rem "Manrope", sans-serif; color: var(--ink); }
.case-site small { font: 500 .82rem "Inter", sans-serif; color: var(--steel); margin-left: 6px; }
.case-work { font-size: .93rem; }
.case-via { font-size: .82rem; color: var(--steel); }
.case-yr {
  font: 600 .82rem "Inter", sans-serif; color: var(--blue);
  letter-spacing: .05em; font-variant-numeric: tabular-nums;
}
@media (min-width: 900px) {
  .case-row { grid-template-columns: 1.35fr 1.45fr .85fr 100px; gap: 28px; align-items: baseline; }
  .case-yr { text-align: right; }
}
.cases-more { margin-top: 26px; font-size: .92rem; }

/* ---------- Roster wall ---------- */
.roster { display: grid; grid-template-columns: 1fr 1fr; gap: 36px 24px; margin-top: 44px; }
.roster h3 {
  font: 700 .72rem "Manrope", sans-serif; letter-spacing: .16em; text-transform: uppercase;
  color: var(--steel); padding-bottom: 10px; margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.roster ul { list-style: none; }
.roster li { padding: 5px 0; font-weight: 500; font-size: .94rem; color: var(--ink); }
@media (min-width: 880px) { .roster { grid-template-columns: repeat(4, 1fr); gap: 40px 40px; } }

/* ---------- Numbered process (real sequence only) ---------- */
.steps { display: grid; gap: 0; margin-top: 48px; }
.step { border-top: 1px solid var(--line); padding: 26px 0; }
.step-num {
  font: 800 2.2rem/1 "Manrope", sans-serif; color: var(--aqua);
  letter-spacing: -.02em; margin-bottom: 12px; font-variant-numeric: tabular-nums;
}
.step h3 { margin-bottom: 8px; }
.step p { font-size: .93rem; }
@media (min-width: 880px) {
  .steps { grid-template-columns: repeat(4, 1fr); gap: 36px; }
  .step { padding: 26px 0 0; }
}

/* ---------- Credentials block ---------- */
.cred {
  background: rgba(255, 255, 255, .04); border: 1px solid var(--line-light);
  border-radius: 10px; padding: 10px 24px; max-width: 560px;
}
.cred-row {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 12px 20px; padding: 15px 0; border-top: 1px solid var(--line-light);
  flex-wrap: wrap;
}
.cred-row:first-child { border-top: 0; }
.cred-row span { color: var(--steel); font-size: .84rem; }
.cred-row b { color: #fff; font: 700 .96rem "Manrope", sans-serif; text-align: right; }
.cred-note { margin-top: 18px; font-size: .84rem; color: var(--steel); max-width: 560px; }

.licence-grid { display: grid; gap: 40px; align-items: start; }
@media (min-width: 960px) { .licence-grid { grid-template-columns: 1fr 1.05fr; gap: 72px; } }

/* Checklist card (light-on-navy paper-trail artifact) */
.check-card {
  background: rgba(255, 255, 255, .04); border: 1px solid var(--line-light);
  border-radius: 10px; padding: 10px 24px 20px;
}
.check-card .cred-note { margin-top: 14px; }

/* ---------- Tables (always inside their own scroller) ---------- */
.table-scroll {
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  margin-top: 40px; border: 1px solid var(--line); border-radius: 10px;
}
table.schedule { width: 100%; min-width: 720px; border-collapse: collapse; }
.schedule th {
  font: 700 .68rem "Manrope", sans-serif; letter-spacing: .16em; text-transform: uppercase;
  color: var(--steel); text-align: left; background: var(--mist);
  padding: 14px 18px; border-bottom: 1px solid var(--line); white-space: nowrap;
}
.schedule td {
  padding: 15px 18px; border-top: 1px solid var(--line);
  font-size: .92rem; vertical-align: top; color: var(--body); background: var(--white);
}
.schedule tr:first-child td { border-top: 0; }
.schedule td b { font: 700 .97rem "Manrope", sans-serif; color: var(--ink); }
.schedule .via { color: var(--steel); font-size: .84rem; }
.schedule .yr {
  color: var(--blue); font-weight: 600; font-size: .84rem;
  white-space: nowrap; font-variant-numeric: tabular-nums;
}

/* ---------- CTA band ---------- */
.cta-band { background: var(--navy); color: #B7C2CF; padding: 72px 0; }
.cta-band h2 { color: #fff; max-width: 20ch; }
.cta-band p { margin-top: 14px; max-width: 560px; }
@media (min-width: 880px) { .cta-band { padding: 96px 0; } }

/* ---------- Contact ---------- */
.contact-grid { display: grid; gap: 24px; margin-top: 48px; }
.contact-card {
  background: var(--white); border: 1px solid var(--line); border-radius: 10px;
  padding: 28px 26px;
}
.contact-card + .contact-card { margin-top: 20px; }
.contact-card h3 { margin-bottom: 14px; }
.contact-card p { font-size: .93rem; }
.contact-card p + p { margin-top: 8px; }
.contact-card .big { margin: 0 0 6px; }
.contact-card .big a {
  font: 700 1.22rem "Manrope", sans-serif; text-decoration: none;
}
.contact-card .big a:hover { text-decoration: underline; }
.contact-card .fine { margin-top: 14px; color: var(--steel); font-size: .86rem; }
@media (min-width: 960px) {
  .contact-grid { grid-template-columns: .9fr 1.1fr; align-items: start; }
}

/* Forms */
form label {
  display: block; font: 700 .7rem "Manrope", sans-serif; letter-spacing: .14em;
  text-transform: uppercase; color: var(--steel); margin: 20px 0 7px;
}
form input, form select, form textarea {
  width: 100%; padding: 12px 14px;
  border: 1px solid rgba(10, 26, 47, .22); border-radius: 8px;
  font: 400 1rem/1.4 "Inter", sans-serif; color: var(--ink); background: #fff;
}
form input:focus, form select:focus, form textarea:focus { border-color: var(--blue); }
form button { margin-top: 26px; width: 100%; }
@media (min-width: 640px) { form button { width: auto; } }

/* ---------- Footer ---------- */
.site-foot { background: var(--navy); color: #B7C2CF; }
.foot-grid { display: grid; gap: 40px; padding: 60px 0 48px; }
.site-foot h4 {
  font: 700 .72rem "Manrope", sans-serif; letter-spacing: .18em; text-transform: uppercase;
  color: var(--steel); margin-bottom: 16px;
}
.site-foot p { font-size: .9rem; }
.site-foot ul { list-style: none; }
.site-foot li { padding: 4px 0; font-size: .9rem; }
.site-foot a { color: #E6ECF2; text-decoration: none; }
.site-foot a:hover { color: var(--aqua); }
.foot-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.foot-brand img { width: 26px; height: 26px; }
.foot-brand .wordmark { color: #fff; font-size: .95rem; }
.foot-zh { margin-top: 14px; color: var(--aqua); font-size: .95rem; }
.foot-positioning { margin-top: 10px; color: var(--steel); font-size: .82rem; max-width: 34ch; }
.foot-legal {
  border-top: 1px solid var(--line-light); padding: 22px 0;
  font-size: .78rem; color: var(--steel);
}
.foot-legal .signoff { display: block; margin-top: 6px; }
@media (min-width: 880px) {
  .foot-grid { grid-template-columns: 1.35fr 1fr 1.1fr; gap: 56px; }
}

/* ---------- Sticky mobile enquiry bar ---------- */
.sticky-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: none; gap: 10px; padding: 10px 14px;
  padding-bottom: calc(10px + env(safe-area-inset-bottom));
  background: rgba(10, 26, 47, .97); border-top: 1px solid var(--line-light);
}
.sticky-cta .btn { flex: 1; min-height: 46px; padding: .8rem .6rem; font-size: .88rem; }
@media (max-width: 759px) {
  .sticky-cta { display: flex; }
  body.has-sticky { padding-bottom: 78px; }
}

/* ---------- Scroll reveal (motion-safe, JS-gated) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0; transform: translateY(16px);
    transition: opacity .55s ease, transform .55s ease;
  }
  .js [data-reveal].in { opacity: 1; transform: none; }
}

/* ---------- Guide page helpers ---------- */
.swatches { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px; }
.swatch { flex: 1 1 140px; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.swatch i { display: block; height: 64px; }
.swatch span { display: block; padding: 10px 12px; font-size: .78rem; color: var(--body); }
.guide-list { margin: 16px 0 0 20px; }
.guide-list li { padding: 4px 0; font-size: .95rem; }

/* Ambient water loop behind the hero (Higgsfield atmospheric asset,
   promoted 2026-08-05). Sits under .wrap (z1), veiled for contrast;
   removed for reduced-motion users. */
.hero-sea {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0; opacity: .34; filter: saturate(.85);
}
.hero-veil {
  position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(180deg, rgba(10,26,47,.6), rgba(10,26,47,.28) 45%, rgba(10,26,47,.75));
}
@media (prefers-reduced-motion: reduce) {
  .hero-sea { display: none; }
}