/* INVOULT — Corporate infrastructure site
   Type pairing: Newsreader (serif) + Inter (sans) + IBM Plex Mono (technical labels)
   Palette: deep navy + warm off-white + controlled terracotta / copper accents
*/

:root {
  /* ——— Navy / Ink ——— */
  --navy-900: #060F23;
  --navy-800: #0B1833;  /* primary navy */
  --navy-700: #142243;
  --navy-600: #1F2E54;
  --navy-500: #34406A;
  --navy-300: #7F8AA7;
  --navy-200: #B3BACC;

  /* ——— Ink (text) ——— */
  --ink-900: #111827;
  --ink-800: #1F2937;
  --ink-700: #263243;  /* body */
  --ink-600: #374151;
  --ink-500: #4B5563;  /* muted; floor for secondary text */
  --ink-400: #6B7280;

  /* ——— Warm surfaces ——— */
  --paper-50:  #FAFAF7;  /* clean surface */
  --paper-100: #F7F4EE;  /* soft warm */
  --paper-200: #F0EBE0;
  --paper-300: #E8E2D8;  /* secondary on-dark text */
  --paper-400: #D9D6CE;
  --white: #FFFFFF;

  /* ——— Borders ——— */
  --line-soft:  #ECE7DC;
  --line-mid:   #E2DED6;
  --line-firm:  #C9C2B8;

  --line-soft-dark: rgba(255, 255, 255, 0.10);
  --line-mid-dark:  rgba(255, 255, 255, 0.18);
  --line-firm-dark: rgba(255, 255, 255, 0.32);

  /* ——— Accents ——— */
  --copper:      #B86135;  /* primary accent */
  --copper-dark: #8F4528;  /* hover / press */
  --copper-soft: #C46A3A;
  --amber:       #D88A3D;  /* secondary warm */

  /* Backward-compat aliases */
  --terracotta: var(--copper);

  --serif: 'Newsreader', 'Tiempos', 'Iowan Old Style', Georgia, serif;
  --sans:  'Inter', 'Suisse', 'Helvetica Neue', Arial, sans-serif;
  --mono:  'IBM Plex Mono', 'JetBrains Mono', ui-monospace, Menlo, monospace;

  --container: 1240px;
  --gutter: 32px;

  --shadow-card: 0 12px 30px rgba(11, 24, 51, 0.06);
  --shadow-card-hover: 0 18px 44px rgba(11, 24, 51, 0.10);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper-100);
  color: var(--ink-700);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

/* ——— Typography ——— */
.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.012em; }
.mono  { font-family: var(--mono); font-feature-settings: "tnum" 1, "ss01" 1; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.022em;
  color: var(--ink-900);
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(40px, 5.6vw, 78px); line-height: 0.98; letter-spacing: -0.034em; font-weight: 500; }
h2 { font-size: clamp(30px, 3.6vw, 54px); line-height: 1.04; letter-spacing: -0.026em; font-weight: 500; }
h3 { font-size: clamp(22px, 2.0vw, 28px); line-height: 1.14; letter-spacing: -0.018em; font-weight: 500; }
h4 { font-size: 18px; line-height: 1.3; font-weight: 500; }

p  { margin: 0; color: var(--ink-700); }
p.lead { font-size: clamp(17px, 1.4vw, 20px); line-height: 1.6; color: var(--ink-600); max-width: 64ch; }

.section { background: var(--paper-100); }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--copper);
  display: inline-block;
}
.eyebrow.on-dark { color: var(--amber); }
.eyebrow.on-dark::before { background: var(--amber); }

.label-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-500);
}

/* ——— Layout ——— */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: clamp(72px, 9vw, 140px) 0;
  border-top: 1px solid var(--line-soft);
}
.section--tight { padding: clamp(56px, 7vw, 96px) 0; }
.section--dark {
  background: var(--navy-800);
  color: var(--paper-100);
  border-top: 0;
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--white); }
.section--dark p { color: var(--paper-300); }
.section--paper-50 { background: var(--paper-50); }
.section--white { background: var(--white); }

.grid { display: grid; gap: var(--gutter); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--12 { grid-template-columns: repeat(12, 1fr); }

.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }

/* ——— Buttons ——— */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 180ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--copper);
  color: var(--white);
  border-color: var(--copper);
}
.btn-primary:hover { background: var(--copper-dark); border-color: var(--copper-dark); }
.btn-secondary {
  background: transparent;
  color: var(--ink-900);
  border-color: var(--line-firm);
}
.btn-secondary:hover { border-color: var(--ink-900); }
.btn-ghost-light {
  background: transparent;
  color: var(--white);
  border-color: var(--line-firm-dark);
}
.btn-ghost-light:hover { border-color: var(--white); }
.btn-light {
  background: var(--copper);
  color: var(--white);
  border-color: var(--copper);
}
.btn-light:hover { background: var(--copper-dark); border-color: var(--copper-dark); }
.btn-navy {
  background: var(--navy-800);
  color: var(--white);
  border-color: var(--navy-800);
}
.btn-navy:hover { background: var(--navy-900); border-color: var(--navy-900); }
.btn .arr { display: inline-block; transition: transform 200ms ease; }
.btn:hover .arr { transform: translateX(4px); }

/* ——— Header ——— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 244, 238, 0.88);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.site-header.on-dark {
  background: rgba(11, 24, 51, 0.82);
  border-bottom-color: var(--line-soft-dark);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-900);
  white-space: nowrap;
  line-height: 1;
}
.brand .brand-word {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  gap: 0;
}
.brand-mark {
  display: inline-block;
  width: 0.95em;
  height: 0.95em;
  vertical-align: -0.06em;
  margin: 0 0.02em;
}
.on-dark .brand { color: var(--paper-50); }
.brand-mark { display: inline-block; vertical-align: middle; }

.nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-600);
  position: relative;
  padding: 6px 0;
}
.on-dark .nav a { color: var(--paper-300); }
.nav a:hover { color: var(--ink-900); }
.on-dark .nav a:hover { color: var(--white); }
.nav a.active { color: var(--ink-900); }
.on-dark .nav a.active { color: var(--white); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--copper);
}
.on-dark .nav a.active::after { background: var(--copper); }

.header-end {
  display: flex;
  align-items: center;
  gap: 18px;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  border: 1px solid var(--line-mid);
  border-radius: 999px;
  overflow: hidden;
}
.on-dark .lang-switch { border-color: var(--line-mid-dark); }
.lang-switch button {
  background: transparent;
  border: 0;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--ink-500);
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}
.on-dark .lang-switch button { color: var(--paper-300); }
.lang-switch button.active {
  background: var(--copper);
  color: var(--white);
}
.on-dark .lang-switch button.active {
  background: var(--copper);
  color: var(--white);
}
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-900);
  border-left: 1px solid var(--line-mid);
  padding-left: 18px;
  white-space: nowrap;
}
.on-dark .header-cta { color: var(--white); border-left-color: var(--line-mid-dark); }
.header-cta .dot {
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--copper);
  display: inline-block;
}

.mobile-toggle { display: none; }

/* ——— Hero ——— */
.hero {
  background:
    radial-gradient(circle at 88% 8%, rgba(184, 97, 53, 0.18), transparent 38%),
    radial-gradient(circle at 12% 92%, rgba(184, 97, 53, 0.08), transparent 42%),
    var(--navy-800);
  color: var(--paper-100);
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line-soft-dark);
}
.hero::before {
  /* very subtle grid */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at 70% 50%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 50%, black 30%, transparent 75%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: clamp(80px, 11vw, 160px) 0 clamp(80px, 11vw, 140px);
}
.hero h1 { color: var(--white); }
.hero p.lead { color: var(--paper-300); max-width: 52ch; }
.hero-meta {
  margin-top: 36px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-foot {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft-dark);
  color: var(--paper-300);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.hero-foot span { display: inline-flex; align-items: center; gap: 8px; }
.hero-foot .dot { width: 4px; height: 4px; background: var(--copper); border-radius: 999px; }

/* ——— Cards ——— */
.card {
  background: var(--white);
  border: 1px solid var(--line-mid);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 200ms ease, transform 240ms ease, box-shadow 240ms ease;
}
.card:hover {
  border-color: var(--copper);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}
.card .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--copper);
  font-weight: 500;
}
.card h3 { color: var(--ink-900); }
.card .ft {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-500);
  text-transform: uppercase;
}

.card--dark {
  background: var(--navy-700);
  border-color: var(--line-soft-dark);
  color: var(--paper-100);
}
.card--dark:hover {
  border-color: var(--copper);
  box-shadow: none;
}
.card--dark h3 { color: var(--white); }
.card--dark p { color: var(--paper-300); }
.card--dark .num { color: var(--amber); }
.card--dark .ft { border-top-color: var(--line-soft-dark); color: var(--paper-300); }

.feat-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}
.feat-list li {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  font-size: 14px;
  color: var(--ink-700);
  padding: 8px 0;
  border-top: 1px solid var(--line-soft);
}
.feat-list li:first-child { border-top: 0; }
.feat-list li::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--copper);
  margin-top: 8px;
  display: inline-block;
}
.card--dark .feat-list li { color: var(--paper-200); border-top-color: var(--line-soft-dark); }

/* ——— Diagram base ——— */
.diagram {
  width: 100%;
  height: auto;
  display: block;
}
.diagram text {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ——— Footer ——— */
.site-footer {
  background: var(--navy-900);
  color: var(--paper-200);
  padding: 80px 0 36px;
}
.site-footer h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-300);
  font-weight: 500;
  margin-bottom: 18px;
}
.site-footer a { color: var(--paper-200); font-size: 14px; transition: color 160ms ease; }
.site-footer a:hover { color: var(--white); }
.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line-soft-dark);
}
.footer-brand {
  display: flex; flex-direction: column; gap: 16px; max-width: 360px;
}
.footer-brand .brand { color: var(--white); }
.footer-pos { color: var(--paper-300); font-size: 14px; line-height: 1.6; }
.footer-list { display: flex; flex-direction: column; gap: 10px; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-300);
}
.footer-bottom .pill {
  border: 1px solid var(--line-soft-dark);
  padding: 6px 12px;
  border-radius: 999px;
  display: inline-flex; align-items: center; gap: 8px;
}
.footer-bottom .dot { width: 6px; height: 6px; background: var(--copper); border-radius: 999px; }

/* ——— Page intro (sub-pages) ——— */
.page-intro {
  background:
    radial-gradient(circle at 90% 10%, rgba(184, 97, 53, 0.14), transparent 38%),
    var(--navy-800);
  color: var(--paper-100);
  border-bottom: 1px solid var(--line-soft-dark);
}
.page-intro .container {
  padding-top: clamp(72px, 9vw, 132px);
  padding-bottom: clamp(56px, 7vw, 96px);
}
.page-intro h1 { color: var(--white); max-width: 22ch; }
.page-intro p.lead { color: var(--paper-300); margin-top: 24px; max-width: 60ch; }
.page-intro .meta {
  display: flex; gap: 28px; flex-wrap: wrap;
  margin-bottom: 28px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--amber);
}

/* ——— Two-column layer block ——— */
.layer-block {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  padding: 64px 0;
  border-top: 1px solid var(--line-soft);
  align-items: start;
}
.layer-block:first-of-type { border-top: 0; padding-top: 0; }
.layer-block .lb-meta {
  position: sticky;
  top: 100px;
}
.layer-block .lb-num {
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.16em; color: var(--copper); font-weight: 500;
  margin-bottom: 14px; text-transform: uppercase;
}
.layer-block .lb-name {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 30px; line-height: 1.05; color: var(--ink-900);
  letter-spacing: -0.022em;
  margin-bottom: 12px;
}
.layer-block .lb-kicker { color: var(--ink-500); font-size: 14px; }

/* ——— Table-ish list ——— */
.spec {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}
.spec > div {
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex; gap: 24px; align-items: baseline;
}
.spec .k {
  flex: 0 0 36%;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-500);
}
.spec .v { font-size: 14px; color: var(--ink-700); }

/* ——— CTA section ——— */
.cta-band {
  background:
    radial-gradient(circle at 8% 10%, rgba(184, 97, 53, 0.12), transparent 42%),
    var(--navy-800);
  color: var(--paper-100);
}
.cta-band .inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: end;
  padding: clamp(72px, 9vw, 120px) 0;
}
.cta-band h2 { color: var(--white); max-width: 22ch; }
.cta-band p { color: var(--paper-300); max-width: 44ch; }

/* ——— Forms ——— */
.field {
  display: flex; flex-direction: column; gap: 8px;
}
.field label {
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-500);
}
.field input, .field select, .field textarea {
  font: inherit;
  border: 0;
  border-bottom: 1px solid var(--line-firm);
  background: transparent;
  padding: 12px 0;
  color: var(--ink-900);
  outline: none;
  transition: border-color 180ms ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-bottom-color: var(--copper);
}
.field textarea { min-height: 120px; resize: vertical; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  padding: 8px 14px;
  border: 1px solid var(--line-mid);
  border-radius: 999px;
  cursor: pointer;
  color: var(--ink-700);
  background: transparent;
  transition: all 160ms ease;
  user-select: none;
}
.chip:hover { border-color: var(--ink-700); }
.chip.is-on { background: var(--copper); color: var(--white); border-color: var(--copper); }

/* ——— Misc ——— */
.divider-num {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--copper); text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 28px;
}
.divider-num::after {
  content: ""; flex: 1; height: 1px; background: var(--line-mid);
}
.on-dark .divider-num { color: var(--amber); }
.on-dark .divider-num::after { background: var(--line-soft-dark); }

.kicker-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 64px;
}
.kicker-grid h2 { max-width: 18ch; }
.kicker-grid p { max-width: 52ch; }

/* ——— Responsive ——— */
@media (max-width: 1100px) {
  .header-cta { display: none; }
}

@media (max-width: 980px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
  .layer-block { grid-template-columns: 1fr; gap: 32px; }
  .layer-block .lb-meta { position: static; }
  .kicker-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-band .inner { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  :root { --gutter: 20px; }
  .nav, .header-cta { display: none; }
  .mobile-toggle { display: inline-flex; }
  .grid--2 { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: 1fr; }
  .grid--4 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .spec { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
}

/* ——— i18n helper ——— */
[data-i18n-en] { display: none; }
html[lang="en"] [data-i18n-tr] { display: none; }
html[lang="en"] [data-i18n-en] { display: inline; }
html[lang="en"] [data-i18n-en-block] { display: block; }
[data-i18n-en-block] { display: none; }

/* reveal */
[data-reveal] { opacity: 0; transform: translateY(12px); transition: opacity 700ms ease, transform 700ms ease; }
[data-reveal].is-in { opacity: 1; transform: none; }