/* ===================================================================
   ALTUNOVA YAPI — Tasarım Sistemi
   Konsept: Teknik çizim / mimari proje paftası estetiği.
   İnce çizgiler, köşe işaretleri (kroki köşe damgaları) ve düz,
   keskin köşeli paneller — döküm beton ve çelik dünyasına referans.
   =================================================================== */

:root {
  --ink: #1B1B18;
  --concrete: #EDEAE2;
  --concrete-2: #E2DED2;
  --charcoal: #21242A;
  --charcoal-2: #2B2F36;
  --steel: #45566B;
  --safety: #D9631E;
  --safety-dark: #B84F16;
  --line: #C9C2AF;
  --line-dark: #3B4048;
  --white: #FFFFFF;

  --font-display: 'Archivo', 'Segoe UI', sans-serif;
  --font-body: 'Work Sans', 'Segoe UI', sans-serif;

  --maxw: 1180px;
  --gap: 24px;
  --radius: 2px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--concrete);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  margin: 0 0 .5em;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.1rem, 4.2vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); }
h3 { font-size: 1.15rem; }

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

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

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

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--safety);
  color: #fff; padding: 10px 16px; z-index: 200;
}
.skip-link:focus { left: 0; }

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Köşe işaretleri (teknik pafta köşe damgası) ---------- */
.ticked { position: relative; }
.ticked::before, .ticked::after {
  content: "";
  position: absolute;
  width: 16px; height: 16px;
  pointer-events: none;
}
.ticked::before {
  top: -1px; left: -1px;
  border-top: 2px solid var(--safety);
  border-left: 2px solid var(--safety);
}
.ticked::after {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--safety);
  border-right: 2px solid var(--safety);
}

/* ---------- Butonlar ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .95rem;
  padding: 14px 26px;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.btn-primary {
  background: var(--safety);
  border-color: var(--safety);
  color: #fff;
}
.btn-primary:hover { background: var(--safety-dark); border-color: var(--safety-dark); }
.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--concrete); }
.btn-on-dark { border-color: var(--concrete); color: var(--concrete); }
.btn-on-dark:hover { background: var(--concrete); color: var(--charcoal); }
.btn-small { padding: 9px 16px; font-size: .85rem; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- Header ---------- */
.site-header {
  background: var(--charcoal);
  border-bottom: 1px solid var(--line-dark);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 26px; height: 26px;
  border: 2px solid var(--safety);
  position: relative;
  flex-shrink: 0;
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: 5px;
  border-top: 2px solid var(--safety);
  border-right: 2px solid var(--safety);
}
.brand-text {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.2rem;
  color: var(--concrete);
}
.brand-text strong { font-weight: 800; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.site-nav a {
  font-size: .95rem;
  font-weight: 500;
  color: #C6CAD1;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--concrete);
  border-bottom-color: var(--safety);
}
.nav-phone {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--concrete) !important;
  border: 1.5px solid var(--line-dark);
  padding: 8px 16px !important;
  border-bottom: 1.5px solid var(--line-dark) !important;
}
.nav-phone:hover { border-color: var(--safety); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; width: 100%;
  background: var(--concrete);
}

/* ---------- Hero ---------- */
.hero { padding: 64px 0 72px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 56px;
  align-items: start;
}
.hero-eyebrow {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--steel);
  font-size: .95rem;
  margin: 0 0 14px;
}
.hero-copy p { font-size: 1.08rem; color: #3C3B36; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.spec-panel {
  background: var(--charcoal);
  color: var(--concrete);
  padding: 30px 28px;
}
.spec-panel h3 {
  color: var(--concrete);
  font-size: .95rem;
  font-weight: 500;
  text-transform: none;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-dark);
}
.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-dark);
}
.spec-row:last-child { border-bottom: none; }
.spec-row span { color: #9BA1AB; font-size: .92rem; }
.spec-row strong {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--concrete);
}

/* ---------- Genel bölüm yapısı ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--concrete-2); }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.section-head p { margin: 0; color: #5B5A54; }
.section-dark { background: var(--charcoal); color: var(--concrete); }
.section-dark h2, .section-dark h3 { color: var(--concrete); }
.section-dark .section-head { border-bottom-color: var(--line-dark); }

/* ---------- Hizmetler (spec-sheet liste) ---------- */
.service-list {
  border-top: 1px solid var(--line);
}
.service-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.service-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--line);
}
.service-row h3 { margin-bottom: 6px; }
.service-row p { margin: 0; color: #4A4943; }

/* ---------- Süreç adımları (gerçek sıralı içerik) ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.process-step {
  padding: 0 22px 0 0;
  border-right: 1px solid var(--line-dark);
  position: relative;
}
.process-step:last-child { border-right: none; }
.process-step .step-index {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  color: var(--safety);
  display: block;
  margin-bottom: 10px;
}
.process-step h3 { font-size: 1.05rem; }
.process-step p { color: #AEB3BB; font-size: .93rem; margin: 0; }

/* ---------- Proje kartları ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.project-card {
  background: var(--white);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}
.project-media {
  aspect-ratio: 4 / 3;
  background: var(--concrete-2)
    linear-gradient(135deg, transparent 0%, transparent 48%, var(--line) 48%, var(--line) 52%, transparent 52%, transparent 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.project-media .media-label {
  font-family: var(--font-display);
  font-size: .75rem;
  color: #8A857A;
  background: rgba(237,234,226,.9);
  padding: 4px 10px;
  border: 1px solid var(--line);
}
.project-status {
  position: absolute;
  top: 10px; left: 10px;
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 700;
  padding: 4px 10px;
  background: var(--safety);
  color: #fff;
}
.project-body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex-grow: 1; }
.project-cat { font-size: .82rem; color: var(--steel); font-weight: 600; margin-bottom: 6px; }
.project-body h3 { margin-bottom: 8px; }
.project-body p { font-size: .92rem; color: #55534C; margin-bottom: 16px; }
.project-meta {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  font-size: .85rem;
  color: #7A7870;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ---------- CTA bandı ---------- */
.cta-band {
  background: var(--safety);
  color: #fff;
  padding: 56px 0;
}
.cta-band .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin: 0; }
.cta-band .btn-ghost { border-color: #fff; color: #fff; }
.cta-band .btn-ghost:hover { background: #fff; color: var(--safety-dark); }

/* ---------- Hakkımızda ---------- */
.about-hero { padding: 56px 0 12px; }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 56px;
  align-items: start;
}
.value-list { display: grid; gap: 22px; margin-top: 8px; }
.value-item { border-left: 2px solid var(--safety); padding: 4px 0 4px 18px; }
.value-item h3 { margin-bottom: 4px; font-size: 1.05rem; }
.value-item p { margin: 0; color: #4A4943; font-size: .95rem; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
}
.stat-cell {
  padding: 26px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat-cell:nth-child(2n) { border-right: none; }
.stat-cell strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--charcoal);
}
.stat-cell span { font-size: .88rem; color: #6B6A62; }

/* ---------- Projeler filtre ---------- */
.filter-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.filter-chip {
  font-size: .88rem;
  font-weight: 500;
  padding: 8px 16px;
  border: 1px solid var(--line);
  background: var(--white);
}
.filter-chip.active {
  background: var(--charcoal);
  border-color: var(--charcoal);
  color: var(--concrete);
}
.filter-chip:hover:not(.active) { border-color: var(--steel); }

.empty-state {
  padding: 60px 24px;
  text-align: center;
  border: 1px dashed var(--line);
  color: #6B6A62;
}

/* ---------- Proje detay ---------- */
.detail-hero {
  background: var(--charcoal);
  color: var(--concrete);
  padding: 44px 0;
}
.detail-hero .project-cat { color: #C6CAD1; }
.detail-hero h1 { color: var(--concrete); margin-bottom: 12px; }
.detail-meta {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark);
}
.detail-meta div span { display: block; font-size: .8rem; color: #9BA1AB; margin-bottom: 4px; }
.detail-meta div strong { font-family: var(--font-display); font-size: 1.05rem; }
.detail-body { padding: 56px 0; max-width: 76ch; }
.detail-body p { color: #3C3B36; font-size: 1.02rem; }
.back-link { display: inline-block; margin-bottom: 24px; font-weight: 600; color: var(--steel); }
.back-link:hover { color: var(--safety); }

/* ---------- İletişim ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  gap: 56px;
  align-items: start;
}
.contact-info-list { display: grid; gap: 22px; margin-top: 24px; }
.contact-info-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.contact-info-item span { display: block; font-size: .82rem; color: var(--steel); font-weight: 600; margin-bottom: 4px; }
.contact-info-item strong { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; }

.form-panel {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 32px;
}
.form-row { margin-bottom: 20px; }
.form-row label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.form-row input,
.form-row textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--concrete);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: .96rem;
  color: var(--ink);
  border-radius: var(--radius);
}
.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--safety);
  background: #fff;
}
.form-row textarea { min-height: 140px; resize: vertical; }
.form-two { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.alert {
  padding: 16px 18px;
  border-left: 3px solid var(--safety);
  background: #FBEFE6;
  margin-bottom: 24px;
  font-size: .95rem;
}
.alert-success { border-left-color: #3A7D44; background: #E8F3E9; }
.alert-error { border-left-color: #B4302B; background: #FBEAE9; }

/* ---------- Footer ---------- */
.site-footer { background: var(--charcoal); color: #B6BBC2; padding: 56px 0 0; margin-top: 80px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-dark);
}
.footer-col h3 {
  color: var(--concrete);
  font-size: .95rem;
  margin-bottom: 16px;
}
.footer-col a { display: block; padding: 4px 0; color: #B6BBC2; }
.footer-col a:hover { color: var(--safety); }
.footer-brand p { color: #9BA1AB; margin-top: 10px; font-size: .92rem; }
.brand-text.light { color: var(--concrete); font-family: var(--font-display); font-weight: 500; font-size: 1.2rem; }
.brand-text.light strong { font-weight: 800; }
.footer-bottom {
  padding: 20px 24px;
  font-size: .85rem;
  color: #7B818A;
}

/* ---------- Duyarlı tasarım ---------- */
@media (max-width: 960px) {
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
  .process-step { border-right: none; border-bottom: 1px solid var(--line-dark); padding-bottom: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--charcoal);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    border-bottom: 1px solid var(--line-dark);
    transition: max-height .25s ease;
  }
  .site-nav.open { max-height: 400px; }
  .site-nav a { width: 100%; padding: 16px 24px; border-bottom: 1px solid var(--line-dark); }
  .nav-phone { margin: 12px 24px; width: calc(100% - 48px); text-align: center; }
  .project-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .stat-cell:nth-child(2n) { border-right: 1px solid var(--line); }
  .form-two { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band .wrap { flex-direction: column; align-items: flex-start; }
  .process-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2rem; }
}