/* =========================================================
   RATNAM ENGINEERING — shared stylesheet
   ========================================================= */

:root {
  /* Color tokens */
  --navy: #0E1B2B;
  --navy-soft: #16283D;
  --ink: #1B2024;
  --paper: #FAF9F6;
  --paper-alt: #F1EFE9;
  --steel: #52616F;
  --line: #CFCABC;
  --line-on-dark: rgba(255, 255, 255, 0.18);
  --bronze: #96793E;
  --bronze-light: #C9AE7A;
  --white: #FFFFFF;

  /* Type */
  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;

  /* Layout */
  --content-max: 1180px;
  --side-margin: clamp(20px, 5vw, 64px);
  --rule: 1px solid var(--line);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--navy);
}

h1 { font-size: clamp(2.4rem, 4.6vw, 3.8rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; max-width: 62ch; }

a { color: inherit; text-decoration: none; }

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

button { font-family: inherit; }

::selection { background: var(--bronze-light); color: var(--navy); }

:focus-visible {
  outline: 2px solid var(--bronze);
  outline-offset: 2px;
}

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--side-margin);
  padding-right: var(--side-margin);
}

.section {
  padding: clamp(56px, 9vw, 108px) 0;
}

.section--alt {
  background: var(--paper-alt);
  border-top: var(--rule);
  border-bottom: var(--rule);
}

.section--dark {
  background: var(--navy);
  color: var(--white);
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--white); }
.section--dark p { color: rgba(255,255,255,0.78); }

.section-head {
  max-width: 640px;
  margin-bottom: 44px;
}

.section-head .kicker {
  display: block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bronze);
  margin-bottom: 10px;
}

.rule {
  border: none;
  border-top: var(--rule);
  margin: 40px 0;
}

/* ---------- Corner-tick frame (recurring engineering-drawing motif) ---------- */
.tick-frame {
  position: relative;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
}
.tick-frame::before,
.tick-frame::after,
.tick-frame > .tick-tl,
.tick-frame > .tick-br {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
}
.tick-frame::before { top: -1px; left: -1px; border-top: 2px solid var(--bronze); border-left: 2px solid var(--bronze); }
.tick-frame::after { bottom: -1px; right: -1px; border-bottom: 2px solid var(--bronze); border-right: 2px solid var(--bronze); }

.tick-frame--dark { border-color: var(--line-on-dark); }

/* =========================================================
   Header / Navigation
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 249, 246, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-mark {
  display: block;
  width: 34px;
  height: 34px;
  min-width: 34px;
  max-width: 34px;
  flex: 0 0 34px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--navy);
}

.brand-sub {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--steel);
  margin-top: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.main-nav a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink);
  padding: 6px 0;
  position: relative;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  border-bottom-color: var(--bronze);
}

.header-cta {
  display: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--navy);
  position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--navy);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    top: 84px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--paper);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px var(--side-margin) 32px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }
  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }
  .main-nav a {
    width: 100%;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    font-size: 1.05rem;
  }
  .nav-toggle { display: flex; }
}

.nav-toggle[aria-expanded="true"] span::before { transform: rotate(45deg) translate(4px, 4px); }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::after { transform: rotate(-45deg) translate(4px, -4px); }

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 26px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn--primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn--primary:hover { background: var(--navy-soft); }

.btn--ghost {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn--ghost:hover { background: var(--navy); color: var(--white); }

.btn--ghost-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.55);
}
.btn--ghost-light:hover { background: var(--white); color: var(--navy); }

.btn-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  background:
    linear-gradient(rgba(14,27,43,0.94), rgba(14,27,43,0.97)),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.035) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.035) 0 1px, transparent 1px 64px);
  color: var(--white);
  overflow: hidden;
  padding: clamp(64px, 12vw, 128px) 0 clamp(48px, 8vw, 96px);
  border-bottom: 3px solid var(--bronze);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
}

.hero-eyebrow {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--bronze-light);
  margin-bottom: 18px;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 22px;
}

.hero p.lede {
  color: rgba(255,255,255,0.82);
  font-size: 1.08rem;
  max-width: 46ch;
}

.est-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
  background: var(--bronze-light);
  padding: 7px 14px;
  margin-bottom: 26px;
}

.hero-diagram {
  position: relative;
}

.hero-diagram svg { width: 100%; height: auto; }

.hero-line {
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: draw-line 2.4s 0.3s cubic-bezier(.4,.1,.2,1) forwards;
}

@keyframes draw-line {
  to { stroke-dashoffset: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-line { stroke-dashoffset: 0; animation: none; }
}

/* =========================================================
   Capabilities / Services grid
   ========================================================= */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-3 { grid-template-columns: 1fr; } }

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-4 { grid-template-columns: 1fr; } }

.grid-tile {
  background: var(--paper);
  padding: 30px 26px;
}

.grid-tile .icon {
  width: 30px;
  height: 30px;
  margin-bottom: 18px;
  color: var(--bronze);
}

.grid-tile h4 { margin-bottom: 8px; }
.grid-tile p { font-size: 0.93rem; color: var(--steel); margin-bottom: 0; }

/* =========================================================
   Spec sheet (project data table)
   ========================================================= */
.spec-sheet {
  border-top: var(--rule);
}

.spec-row {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 0.8fr;
  gap: 20px;
  padding: 26px 0;
  border-bottom: var(--rule);
  align-items: start;
}

@media (max-width: 760px) {
  .spec-row { grid-template-columns: 1fr; gap: 6px; padding: 22px 0; }
  .spec-row .spec-cell { padding-top: 4px; }
}

.spec-cell .label {
  display: block;
  font-size: 0.72rem;
  color: var(--steel);
  margin-bottom: 4px;
}

.spec-cell .value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--navy);
}

.spec-cell .value--muted {
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--ink);
}

.spec-note {
  font-size: 0.86rem;
  color: var(--steel);
  font-style: italic;
  margin-top: 20px;
  max-width: 70ch;
}

/* =========================================================
   Project detail blocks (Projects page)
   ========================================================= */
.project-block {
  padding: 44px 0;
  border-bottom: var(--rule);
}
.project-block:first-child { padding-top: 0; }

.project-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.project-head h3 { color: var(--navy); }

.project-client {
  font-size: 0.86rem;
  color: var(--steel);
  margin-top: 4px;
}

.project-value {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--bronze);
  font-size: 1.1rem;
  white-space: nowrap;
}

.project-meta-row {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 18px;
  font-size: 0.88rem;
  color: var(--steel);
}
.project-meta-row strong { color: var(--ink); font-weight: 600; }

.placeholder-frame {
  border: 1px dashed var(--line);
  background:
    repeating-linear-gradient(45deg, transparent 0 10px, rgba(150,121,62,0.08) 10px 11px);
  padding: 26px;
  font-size: 0.85rem;
  color: var(--steel);
  margin-top: 8px;
}

/* =========================================================
   Sectors grid
   ========================================================= */
.sector-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 700px) { .sector-list { grid-template-columns: 1fr; } }

.sector-tile {
  background: var(--paper);
  padding: 32px 30px;
}

.sector-tile h4 { margin-bottom: 10px; }
.sector-tile p { font-size: 0.93rem; color: var(--steel); margin-bottom: 0; }

/* =========================================================
   Sequence (Our Approach — genuine 4-step sequence)
   ========================================================= */
.sequence {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
@media (max-width: 900px) { .sequence { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .sequence { grid-template-columns: 1fr; } }

.sequence-step .num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--bronze);
  border-top: 2px solid var(--bronze);
  display: inline-block;
  padding-top: 8px;
  margin-bottom: 14px;
  width: 34px;
}
.sequence-step h4 { margin-bottom: 8px; }
.sequence-step p { font-size: 0.92rem; color: var(--steel); }

/* =========================================================
   Two-column content layout (About, Services intro)
   ========================================================= */
.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 32px; } }

.split-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--bronze);
}

/* =========================================================
   Service entries list
   ========================================================= */
.service-entry {
  padding: 34px 0;
  border-bottom: var(--rule);
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 30px;
}
.service-entry:first-of-type { border-top: var(--rule); }
@media (max-width: 760px) { .service-entry { grid-template-columns: 1fr; gap: 10px; } }

.service-entry h3 { font-size: 1.15rem; }
.service-entry p { color: var(--steel); font-size: 0.95rem; margin-bottom: 0; }

/* =========================================================
   CTA banner
   ========================================================= */
.cta-banner {
  background: var(--navy);
  color: var(--white);
  padding: clamp(48px, 8vw, 84px) 0;
  text-align: left;
}
.cta-banner h2 { color: var(--white); margin-bottom: 20px; max-width: 34ch; }

/* =========================================================
   Contact page
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; gap: 36px; } }

.contact-fact {
  padding: 18px 0;
  border-bottom: var(--rule);
}
.contact-fact:first-child { border-top: var(--rule); }
.contact-fact .label { font-size: 0.78rem; color: var(--steel); display: block; margin-bottom: 4px; }
.contact-fact .value { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--navy); }

.form-field {
  margin-bottom: 22px;
}
.form-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
}
.form-field input,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 13px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
}
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--bronze);
  outline: none;
}
.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 560px) { .form-row-2 { grid-template-columns: 1fr; } }

.form-status {
  margin-top: 14px;
  font-size: 0.88rem;
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.success { color: #3B6B4A; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 32px;
  border-top: 4px solid var(--bronze);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 0.7fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-on-dark);
}
@media (max-width: 800px) { .footer-top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .footer-top { grid-template-columns: 1fr; } }

.footer-brand .brand-name { color: var(--white); }
.footer-brand p { color: rgba(255,255,255,0.6); font-size: 0.88rem; margin-top: 14px; max-width: 32ch; }

.footer-col h5 {
  font-family: var(--font-display);
  color: var(--white);
  font-size: 0.82rem;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 10px; font-size: 0.9rem; }
.footer-col a:hover { color: var(--bronze-light); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 24px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* =========================================================
   Page hero (secondary pages — no diagram, simpler)
   ========================================================= */
.page-hero {
  background: var(--navy);
  color: var(--white);
  padding: clamp(56px, 9vw, 88px) 0 clamp(40px, 6vw, 64px);
}
.page-hero h1 { color: var(--white); font-size: clamp(2rem, 3.6vw, 2.9rem); }
.page-hero p { color: rgba(255,255,255,0.78); max-width: 54ch; margin-top: 16px; }
.page-hero .est-tag { margin-bottom: 20px; }