/* ==========================================================================
   Mevlüt Çelik — main.css
   Character: a Swiss engineering dossier. Warm white paper, a visible
   twelve-column grid, very large tight grotesk headlines, monospace
   indices, and one signal colour — international orange.
   ========================================================================== */

/* ---------------------------------- Tokens ------------------------------- */
:root {
  /* Color */
  --canvas:      #f4f3ef;
  --surface:     #fbfaf7;
  --ink:         #121212;
  --ink-mute:    #6b6a66;
  --accent:      #ff4d00;
  --accent-ink:  #121212;
  --hairline:    #d9d6ce;
  --focus:       #ff4d00;

  /* Type */
  --font-display: "Geist", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body:    "Geist", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:    "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --size-body:    17px;

  /* Space */
  --space-xs:   8px;
  --space-sm:   12px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   32px;
  --space-xxl:  56px;
  --space-huge: 128px;

  /* Shape */
  --radius-sm:   2px;
  --radius-pill: 999px;

  /* Layout */
  --column: 1360px;
  --gutter: 24px;
  --nav-height: 64px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

h1, h2, h3, h4, p, dl, dd, ol, ul, figure, blockquote { margin: 0; }
ol, ul { padding: 0; list-style: none; }
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Page-level adjustments to the shared reset */
html { scroll-padding-top: var(--nav-height); }
body { overflow-x: hidden; }
::selection { background: var(--accent); color: var(--accent-ink); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 60;
  padding: var(--space-sm) var(--space-md);
  background: var(--ink);
  color: var(--canvas);
}
.skip-link:focus { left: var(--space-md); top: var(--space-md); }

/* ------------------------------- Typography ------------------------------ */
.display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.045em;
  color: var(--ink);
}
.display--xxl { font-size: clamp(46px, 7.6vw, 124px); line-height: 0.94; }
.display--xl  { font-size: clamp(38px, 5vw, 76px);    line-height: 0.98; }
.display--lg  { font-size: clamp(28px, 3vw, 44px);    line-height: 1.05; letter-spacing: -0.035em; }
.display--md  { font-size: 24px; line-height: 1.15; letter-spacing: -0.025em; }
.display .accent { color: var(--accent); }

.eyebrow,
.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.lead {
  max-width: 34ch;
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.02em;
}
.lead em { font-style: normal; color: var(--ink-mute); }

.link {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 0.2s var(--ease);
}
.link:hover { color: var(--accent); }

/* --------------------------------- Button -------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border: 1px solid var(--ink);
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--canvas);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn__arrow { transition: transform 0.25s var(--ease); }
.btn:hover .btn__arrow { transform: translate(2px, -2px); }

.btn--ghost { background: transparent; color: var(--ink); }

.btn--sm { padding: 8px 14px; font-size: 14px; }

/* ---------------------------------- Grid --------------------------------- */
/* The twelve columns are drawn behind the page as faint hairlines */
.columns {
  position: fixed;
  inset: 0;
  z-index: -1;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
  max-width: var(--column);
  margin: 0 auto;
  padding: 0 var(--gutter);
  pointer-events: none;
}
.columns span { border-left: 1px solid rgba(18, 18, 18, 0.045); }
.columns span:last-child { border-right: 1px solid rgba(18, 18, 18, 0.045); }

.wrap {
  max-width: var(--column);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------------------------------- Nav ---------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--hairline);
  background: rgba(244, 243, 239, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav__inner {
  display: grid;
  grid-template-columns: 3fr 3fr 6fr;
  gap: var(--gutter);
  align-items: center;
  height: var(--nav-height);
}

.nav__brand {
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav__status {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav__menu {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-lg);
}
.nav__list { display: flex; gap: var(--space-lg); }
.nav__link {
  font-size: 14px;
  text-decoration: none;
  color: var(--ink-mute);
  transition: color 0.2s var(--ease);
}
.nav__link:hover,
.nav__link.is-active { color: var(--ink); }
.nav__link.is-active::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: 2px;
}

.nav__toggle {
  display: none;
  justify-self: end;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  border-radius: var(--radius-pill);
  background: transparent;
  font-size: 14px;
  cursor: pointer;
}

/* ---------------------------------- Hero --------------------------------- */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-xxl);
  min-height: calc(100svh - var(--nav-height));
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xxl);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
}
.hero__meta > :nth-child(1) { grid-column: 1 / span 3; }
.hero__meta > :nth-child(2) { grid-column: 4 / span 3; }
.hero__meta > :nth-child(3) { grid-column: 7 / span 3; }
.hero__meta > :nth-child(4) { grid-column: 10 / span 3; text-align: right; }

.hero__title {
  max-width: 15ch;
  animation: rise 1s var(--ease) both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: none; }
}

.hero__foot {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
  align-items: end;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--ink);
}
.hero__intro { grid-column: 1 / span 5; font-size: 19px; line-height: 1.5; }
.hero__facts {
  grid-column: 7 / span 6;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gutter);
}
.hero__facts dd { margin-top: 4px; font-size: 15px; line-height: 1.4; }
.hero__actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* -------------------------------- Ticker --------------------------------- */
.ticker {
  overflow: hidden;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--ink);
  color: var(--canvas);
}
.ticker__track {
  display: flex;
  width: max-content;
  animation: ticker 48s linear infinite;
}
.ticker__list {
  display: flex;
  flex: none;
}
.ticker__list li {
  padding: 14px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  white-space: nowrap;
}
.ticker__list li::after {
  content: "✳";
  margin: 0 28px;
  color: var(--accent);
}
@keyframes ticker { to { transform: translateX(-50%); } }

/* --------------------------------- Bands --------------------------------- */
.band {
  padding: var(--space-huge) 0;
  border-bottom: 1px solid var(--hairline);
}

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

.band__rail {
  grid-column: 1 / span 3;
  align-self: start;
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
}
.band__rail > * + * { margin-top: var(--space-xs); }
.band__index { color: var(--accent); }

.band__body { grid-column: 4 / -1; }
.band__body > * + * { margin-top: var(--space-xxl); }

/* --------------------------------- Specs --------------------------------- */
.specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--ink);
}
.specs__row {
  padding: var(--space-md) var(--space-lg) var(--space-md) 0;
  border-bottom: 1px solid var(--hairline);
}
.specs__row dd { margin-top: 4px; font-size: 17px; line-height: 1.45; }

/* -------------------------------- Services ------------------------------- */
.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--hairline);
}
.service {
  position: relative;
  padding: var(--space-lg) var(--space-lg) var(--space-xl);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  transition: background-color 0.25s var(--ease);
}
.service:hover { background: var(--surface); }
.service > * + * { margin-top: var(--space-sm); }
.service h3 { margin-top: var(--space-xl); }
.service p:last-child { font-size: 15px; line-height: 1.55; color: var(--ink-mute); }
.service::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--accent);
  transition: width 0.35s var(--ease);
}
.service:hover::after { width: 100%; }

/* ---------------------------------- Work --------------------------------- */
.work { border-top: 1px solid var(--ink); }

.work__row {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 220px 90px 32px;
  gap: var(--gutter);
  align-items: baseline;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
  transition: padding 0.3s var(--ease), background-color 0.3s var(--ease);
}
.work__row > * { position: relative; }
.work__row::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.35s var(--ease);
}
a.work__row:hover::before { transform: scaleY(1); }
a.work__row:hover { color: var(--canvas); padding-left: var(--space-md); padding-right: var(--space-md); }
a.work__row:hover .mono,
a.work__row:hover .work__text { color: rgba(244, 243, 239, 0.7); }

.work__title {
  display: block;
  font-size: clamp(24px, 2.6vw, 38px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.035em;
}
.work__text {
  display: block;
  max-width: 62ch;
  margin-top: var(--space-xs);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-mute);
}
.work__arrow {
  justify-self: end;
  font-size: 22px;
  color: var(--accent);
  transition: transform 0.3s var(--ease);
}
a.work__row:hover .work__arrow { transform: translate(3px, -3px); }
.work__row--static .work__arrow { color: var(--hairline); }

/* ------------------------------- Timeline -------------------------------- */
.timeline { border-top: 1px solid var(--ink); }
.job {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) 160px;
  gap: var(--gutter);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--hairline);
}
.job__main > * + * { margin-top: var(--space-xs); }
.job__org { color: var(--ink-mute); }
.job__text { max-width: 64ch; margin-top: var(--space-md) !important; font-size: 16px; line-height: 1.65; }
.job__where { text-align: right; }

/* -------------------------------- Tables --------------------------------- */
.table {
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--ink);
}
.table th,
.table td {
  padding: var(--space-md) var(--space-md) var(--space-md) 0;
  border-bottom: 1px solid var(--hairline);
  text-align: left;
  vertical-align: baseline;
}
.table th {
  width: 25%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.table td { font-size: 16px; }
.table td.table__meta { text-align: right; white-space: nowrap; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xxl) var(--gutter);
}
.split > div > * + * { margin-top: var(--space-md); }

/* -------------------------------- Contact -------------------------------- */
.contact {
  padding: var(--space-huge) 0 var(--space-xxl);
  background: var(--ink);
  color: var(--canvas);
}
.contact .display { color: var(--canvas); }
.contact .mono { color: rgba(244, 243, 239, 0.55); }
.contact > .wrap > * + * { margin-top: var(--space-xxl); }

.contact__mail {
  display: inline-block;
  font-size: clamp(34px, 7vw, 112px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.05em;
  text-decoration: none;
  background: linear-gradient(var(--accent), var(--accent)) left bottom / 0 4px no-repeat;
  transition: background-size 0.45s var(--ease), color 0.2s var(--ease);
  word-break: break-word;
}
.contact__mail:hover { background-size: 100% 4px; color: var(--accent); }

.contact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gutter);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(244, 243, 239, 0.2);
}
.contact__grid dd { margin-top: 4px; }
.contact .btn { background: var(--canvas); border-color: var(--canvas); color: var(--ink); }
.contact .btn:hover { background: var(--accent); border-color: var(--accent); }

/* -------------------------------- Footer --------------------------------- */
.footer {
  background: var(--ink);
  color: rgba(244, 243, 239, 0.55);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-lg) var(--gutter);
  border-top: 1px solid rgba(244, 243, 239, 0.2);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
}
.footer__inner a { text-decoration: none; }
.footer__inner a:hover { color: var(--accent); }

/* -------------------------------- Reveal --------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ------------------------------ Responsive ------------------------------- */
@media (max-width: 1100px) {
  .work__row { grid-template-columns: 44px minmax(0, 1fr) 150px 32px; }
  .work__row .work__year { display: none; }
  .services { grid-template-columns: repeat(2, 1fr); }
  .job { grid-template-columns: 150px minmax(0, 1fr); }
  .job__where { grid-column: 2; text-align: left; }
}

@media (max-width: 900px) {
  :root { --space-huge: 88px; --gutter: 20px; }

  .nav__inner { grid-template-columns: 1fr auto; }
  .nav__status { display: none; }
  .nav__toggle { display: inline-block; }
  .nav__menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md) var(--gutter) var(--space-lg);
    border-bottom: 1px solid var(--hairline);
    background: var(--canvas);
  }
  .nav.is-open .nav__menu { display: flex; }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__link { display: block; padding: var(--space-sm) 0; font-size: 20px; color: var(--ink); }

  .hero__meta > :nth-child(n) { grid-column: span 6; text-align: left; }
  .hero__intro, .hero__facts { grid-column: 1 / -1; }

  .band__rail { position: static; grid-column: 1 / -1; }
  .band__body { grid-column: 1 / -1; }

  .specs, .split { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: repeat(2, 1fr); }
  .columns { grid-template-columns: repeat(4, 1fr); }
  .columns span:nth-child(n+5) { display: none; }
}

@media (max-width: 600px) {
  .services { grid-template-columns: 1fr; }
  .hero__facts { grid-template-columns: 1fr 1fr; }
  .work__row { grid-template-columns: 32px minmax(0, 1fr) 24px; }
  .work__row .work__kind { display: none; }
  .job { grid-template-columns: 1fr; gap: var(--space-xs); }
  .job__where { grid-column: auto; }
  .table th { width: 38%; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .ticker__track { animation: none; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .nav, .columns, .ticker, .hero__actions { display: none; }
  .band { padding: var(--space-xl) 0; }
  .band__rail { position: static; }
  .contact, .footer { background: none; color: var(--ink); }
  .contact .display, .contact .mono { color: var(--ink); }
}