/* ==========================================================================
   DDA Building LTD — site stylesheet
   Single stylesheet shared by every page. No external dependencies.
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------ */
:root {
  --navy-900: #0b1a2b;
  --navy-800: #10263d;
  --navy-700: #1b3a58;
  --slate-600: #4a5f75;
  --slate-400: #8296ab;
  --slate-200: #d7dfe7;
  --slate-100: #eef2f6;
  --white: #ffffff;

  --amber-600: #c9760a;
  --amber-500: #e8940f;
  --amber-100: #fdf1dd;

  --green-600: #1f7a52;
  --green-100: #e3f3eb;

  --text: var(--navy-900);
  --text-muted: var(--slate-600);
  --bg: var(--white);
  --bg-alt: var(--slate-100);
  --border: var(--slate-200);
  --accent: var(--amber-600);

  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;

  --wrap: 1140px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(11, 26, 43, .08), 0 2px 8px rgba(11, 26, 43, .06);
  --shadow-md: 0 4px 12px rgba(11, 26, 43, .10), 0 12px 32px rgba(11, 26, 43, .08);

  --step: clamp(2.5rem, 6vw, 5rem);
}

/* --- Base --------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, h4 {
  margin: 0 0 .5em;
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 700;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; }

a { color: var(--navy-700); text-decoration: none; }
a:hover { color: var(--accent); }

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

/* Components below set their own `display`, which would otherwise beat the
   UA stylesheet's [hidden] rule. Keep `hidden` authoritative. */
[hidden] { display: none !important; }

ul { margin: 0 0 1rem; padding-left: 1.2rem; }
li { margin-bottom: .4rem; }

:focus-visible {
  outline: 3px solid var(--amber-500);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--navy-900);
  color: var(--white);
  padding: .75rem 1.25rem;
  z-index: 100;
}
.skip-link:focus { left: 0; color: var(--white); }

/* --- Layout helpers ----------------------------------------------------- */
.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.section { padding-block: var(--step); }
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--navy-900); color: var(--slate-200); }
.section--dark h2, .section--dark h3 { color: var(--white); }

.section-head { max-width: 62ch; margin-bottom: 2.5rem; }
.section-head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .6rem;
}
.section--dark .eyebrow { color: var(--amber-500); }

.lead { font-size: 1.1rem; color: var(--text-muted); }
.section--dark .lead { color: var(--slate-400); }

.grid { display: grid; gap: 1.5rem; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr)); }

/* --- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .8rem 1.5rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--amber-600); color: var(--white); }
.btn--primary:hover { background: var(--amber-500); color: var(--white); }

.btn--ghost { border-color: currentColor; color: var(--navy-900); background: transparent; }
.btn--ghost:hover { background: var(--navy-900); color: var(--white); border-color: var(--navy-900); }

.section--dark .btn--ghost,
.hero .btn--ghost { color: var(--white); }
.section--dark .btn--ghost:hover,
.hero .btn--ghost:hover { background: var(--white); color: var(--navy-900); border-color: var(--white); }

.btn-row { display: flex; flex-wrap: wrap; gap: .85rem; }

/* --- Header / navigation ------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-weight: 700;
  color: var(--navy-900);
  letter-spacing: -.02em;
}
.brand:hover { color: var(--navy-900); }

.brand__logo {
  height: 58px;
  width: auto;
  display: block;
}

.site-footer .brand__logo { height: 96px; }

.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text small {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.nav { display: flex; align-items: center; gap: .35rem; }

.nav a {
  padding: .55rem .8rem;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  color: var(--navy-800);
}
.nav a:hover { background: var(--slate-100); color: var(--navy-900); }
.nav a[aria-current="page"] { color: var(--accent); }

.nav .btn { margin-left: .5rem; padding: .6rem 1.1rem; }
.nav .btn:hover { background: var(--amber-500); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--navy-900);
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle span { position: relative; }
.nav-toggle span::before,
.nav-toggle span::after { content: ""; position: absolute; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 1024px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute;
    inset: 72px 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .75rem 1.25rem 1.25rem;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: .8rem .6rem; border-radius: 8px; }
  .nav .btn { margin: .5rem 0 0; justify-content: center; }
}

/* --- Hero --------------------------------------------------------------- */
.hero {
  position: relative;
  color: var(--slate-200);
  background:
    linear-gradient(105deg, rgba(11, 26, 43, .94) 30%, rgba(11, 26, 43, .72) 100%),
    repeating-linear-gradient(115deg, #16304c 0 34px, #12283f 34px 68px);
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -30%;
  width: 55%;
  height: 160%;
  background: radial-gradient(circle at 50% 50%, rgba(232, 148, 15, .22), transparent 62%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(3.5rem, 9vw, 6.5rem);
  max-width: 46rem;
}
.hero h1 { color: var(--white); }
.hero p { color: var(--slate-200); font-size: 1.12rem; max-width: 40rem; }

.hero--compact .hero__inner { padding-block: clamp(2.75rem, 6vw, 4rem); }

.breadcrumb {
  position: relative;
  z-index: 1;
  font-size: .85rem;
  color: var(--slate-400);
  padding-top: 1.25rem;
}
.breadcrumb a { color: var(--slate-200); }
.breadcrumb a:hover { color: var(--amber-500); }
.breadcrumb span { margin-inline: .4rem; }

/* --- Stat band ---------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(160px, 100%), 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat { background: var(--white); padding: 1.6rem 1.25rem; text-align: center; }
.stat__value {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--navy-900);
  line-height: 1.1;
}
.stat__label {
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Below ~640px, auto-fit can land on exactly 2 columns for a 3-item stat
   band, leaving an empty (grey) cell in the wrapped row. Force one column
   on phones so that never happens; wider viewports keep the grid above. */
@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
}

/* --- Cards -------------------------------------------------------------- */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s ease, transform .2s ease, border-color .2s ease;
}
.card--link:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--slate-400);
}
.card h3 { margin-bottom: .4rem; }
.card p:last-child { margin-bottom: 0; }

.card__icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 1rem;
  border-radius: 11px;
  background: var(--amber-100);
  color: var(--amber-600);
}
.card__icon svg { width: 24px; height: 24px; }

.card__more {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  margin-top: .9rem;
  font-weight: 600;
  font-size: .92rem;
  color: var(--accent);
}
.card__more::after { content: "\2192"; transition: transform .18s ease; }
.card--link:hover .card__more::after { transform: translateX(3px); }

/* --- Project cards ------------------------------------------------------ */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2rem;
}
.filter {
  min-height: 44px;
  padding: .6rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--white);
  font: inherit;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.filter:hover { border-color: var(--slate-400); color: var(--navy-900); }
.filter[aria-pressed="true"] {
  background: var(--navy-900);
  border-color: var(--navy-900);
  color: var(--white);
}

.project {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}
.project__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    linear-gradient(160deg, rgba(11, 26, 43, .55), rgba(11, 26, 43, .18)),
    repeating-linear-gradient(45deg, #24445f 0 18px, #1d3a53 18px 36px);
  display: grid;
  place-items: center;
}
.project__media span {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .75);
}
.project__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.project__tag {
  position: absolute;
  top: .85rem;
  left: .85rem;
  padding: .3rem .7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, .94);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--navy-900);
}
.project__body { padding: 1.4rem 1.5rem 1.6rem; }
.project__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .9rem;
  margin-bottom: .75rem;
  font-size: .85rem;
  color: var(--text-muted);
}
.project__meta strong { color: var(--navy-900); font-weight: 600; }

/* --- Photo gallery (untitled site photos, masonry-style) ---------------- */
.photo-gallery {
  column-count: 4;
  column-gap: 1rem;
}
.photo-gallery img {
  width: 100%;
  display: block;
  margin-bottom: 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  break-inside: avoid;
}
@media (max-width: 900px) {
  .photo-gallery { column-count: 3; }
}
@media (max-width: 640px) {
  .photo-gallery { column-count: 2; column-gap: .75rem; }
  .photo-gallery img { margin-bottom: .75rem; }
}

.no-results {
  padding: 2.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

/* --- Lists / misc content ----------------------------------------------- */
.checklist { list-style: none; padding: 0; }
.checklist li {
  position: relative;
  padding-left: 1.85rem;
  margin-bottom: .65rem;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45rem;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--green-100);
  box-shadow: inset 0 0 0 2px var(--green-600);
}
.checklist li::after {
  content: "";
  position: absolute;
  left: .35rem;
  top: .7rem;
  width: .32rem;
  height: .55rem;
  border: solid var(--green-600);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 3.5rem;
  margin-bottom: 1.75rem;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--navy-900);
  color: var(--amber-500);
  font-weight: 800;
  font-size: .9rem;
}
.steps h3 { margin-bottom: .25rem; }

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li {
  position: relative;
  padding: 0 0 1.75rem 2rem;
  border-left: 2px solid var(--border);
}
.timeline li:last-child { padding-bottom: 0; border-left-color: transparent; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: .45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber-600);
  box-shadow: 0 0 0 3px var(--white);
}
.timeline time { font-weight: 700; color: var(--navy-900); }

/* --- Tables ------------------------------------------------------------- */
.table-scroll { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; background: var(--white); min-width: 640px; }
caption { text-align: left; padding: 1rem 1.25rem; font-weight: 600; color: var(--text-muted); }
th, td { padding: .85rem 1.25rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--slate-100); font-size: .82rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
tbody tr:last-child td { border-bottom: none; }

.badge {
  display: inline-block;
  padding: .2rem .65rem;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  background: var(--green-100);
  color: var(--green-600);
}
.badge--pending { background: var(--amber-100); color: var(--amber-600); }

/* --- Certification cards ------------------------------------------------ */
.cert { display: flex; gap: 1.1rem; align-items: flex-start; }
.cert__seal {
  flex: none;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--navy-900);
  color: var(--amber-500);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .04em;
  text-align: center;
}
.cert__ref { font-size: .85rem; color: var(--text-muted); margin: 0; }

/* --- Forms -------------------------------------------------------------- */
.form-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field--full { grid-column: 1 / -1; }

label { font-weight: 600; font-size: .92rem; }
.req { color: var(--amber-600); }

input, select, textarea {
  width: 100%;
  padding: .7rem .85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color .18s ease, box-shadow .18s ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--amber-500);
  box-shadow: 0 0 0 3px rgba(232, 148, 15, .2);
}
textarea { resize: vertical; min-height: 140px; }

.hint { font-size: .82rem; color: var(--text-muted); }

.error-text { font-size: .84rem; font-weight: 600; color: #b3261e; min-height: 1.1rem; }
input[aria-invalid="true"], select[aria-invalid="true"], textarea[aria-invalid="true"] {
  border-color: #b3261e;
  box-shadow: 0 0 0 3px rgba(179, 38, 30, .14);
}

.form-status {
  margin-top: 1.25rem;
  padding: .9rem 1.1rem;
  border-radius: var(--radius);
  background: var(--green-100);
  color: var(--green-600);
  font-weight: 600;
}
.form-status[hidden] { display: none; }
.form-status--error { background: #fbe9e7; color: #b3261e; }

.consent { display: flex; gap: .6rem; align-items: flex-start; }
.consent input { width: auto; margin-top: .3rem; }
.consent label { font-weight: 400; font-size: .9rem; color: var(--text-muted); }

/* --- Contact detail blocks ---------------------------------------------- */
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { display: flex; gap: .85rem; margin-bottom: 1.15rem; }
.contact-list svg { flex: none; width: 20px; height: 20px; margin-top: .25rem; color: var(--accent); }
.contact-list strong { display: block; }
.contact-list span { color: var(--text-muted); font-size: .95rem; }

.map-placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background:
    repeating-linear-gradient(0deg, var(--slate-100) 0 39px, var(--border) 39px 40px),
    repeating-linear-gradient(90deg, var(--slate-100) 0 39px, var(--border) 39px 40px);
  color: var(--text-muted);
  font-weight: 600;
  text-align: center;
  padding: 1rem;
}

/* --- CTA band ----------------------------------------------------------- */
.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, var(--navy-900), var(--navy-700));
  color: var(--white);
}
.cta h2 { color: var(--white); margin-bottom: .35rem; }
.cta p { color: var(--slate-200); margin: 0; }

/* --- Footer ------------------------------------------------------------- */
.site-footer {
  background: var(--navy-900);
  color: var(--slate-400);
  padding-block: 3rem 1.5rem;
  margin-top: var(--step);
}
.site-footer h4 {
  color: var(--white);
  font-size: .82rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: .9rem;
}
.site-footer a { color: var(--slate-200); font-size: .95rem; }
.site-footer a:hover { color: var(--amber-500); }
.site-footer ul { list-style: none; padding: 0; }
.site-footer .brand { color: var(--white); margin-bottom: .8rem; }
.site-footer .brand:hover { color: var(--white); }
.site-footer .brand__text small { color: var(--slate-400); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: space-between;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: .85rem;
}

/* --- Motion preferences ------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}

/* --- Print -------------------------------------------------------------- */
@media print {
  .site-header, .site-footer, .cta, .filters { display: none; }
  body { color: #000; }
}