:root {
    --paper:   #EDEAE3;
    --panel:   #E5E1D8;
    --ink:     #171614;
    --stone:   #86817A;
    --line:    #D3CEC4;
    --line-2:  #C7C1B4;
    --redline: #C1382A;
    --ink-soft: rgba(23, 22, 20, 0.62);

    --ff-display: "Helvetica Neue", "Arial Nova", Arial, "Segoe UI", sans-serif;
    --ff-body:    "Helvetica Neue", "Arial", "Segoe UI", system-ui, sans-serif;
    --ff-mono:    ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;

    --maxw: 1240px;
    --gut: clamp(20px, 5vw, 68px);
    --sec: clamp(72px, 11vw, 160px);
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --paper:   #151412;
      --panel:   #1C1B18;
      --ink:     #E9E6DF;
      --stone:   #928C82;
      --line:    #302D28;
      --line-2:  #3A362F;
      --redline: #D8503F;
      --ink-soft: rgba(233, 230, 223, 0.60);
    }
  }
  :root[data-theme="light"] {
    --paper:#EDEAE3; --panel:#E5E1D8; --ink:#171614; --stone:#86817A;
    --line:#D3CEC4; --line-2:#C7C1B4; --redline:#C1382A; --ink-soft:rgba(23,22,20,0.62);
  }
  :root[data-theme="dark"] {
    --paper:#151412; --panel:#1C1B18; --ink:#E9E6DF; --stone:#928C82;
    --line:#302D28; --line-2:#3A362F; --redline:#D8503F; --ink-soft:rgba(233,230,223,0.60);
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--ff-body);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
  }

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

  .mono {
    font-family: var(--ff-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--stone);
  }

  ::selection { background: var(--redline); color: var(--paper); }
  a { color: inherit; text-decoration: none; }
  :focus-visible { outline: 2px solid var(--redline); outline-offset: 3px; }

  /* ---------- HEADER ---------- */
  header {
    position: fixed; inset: 0 0 auto 0; z-index: 50;
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px var(--gut);
    mix-blend-mode: normal;
    transition: background .4s ease, border-color .4s ease, padding .4s ease;
    border-bottom: 1px solid transparent;
  }
  header.scrolled {
    background: color-mix(in srgb, var(--paper) 86%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    padding-top: 13px; padding-bottom: 13px;
  }
  .brand { display: inline-flex; align-items: center; }
  .logo-mark { height: 38px; width: auto; display: block; transition: height .4s ease, transform .5s cubic-bezier(.2,.7,.2,1); }
  header.scrolled .logo-mark { height: 31px; }
  .brand:hover .logo-mark { transform: translateY(-1px); }
  /* logo is black-on-transparent; invert to white on dark grounds */
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]) .logo-mark,
    :root:not([data-theme="light"]) .logo-foot { filter: invert(1); }
  }
  :root[data-theme="dark"] .logo-mark,
  :root[data-theme="dark"] .logo-foot { filter: invert(1); }
  :root[data-theme="light"] .logo-mark,
  :root[data-theme="light"] .logo-foot { filter: none; }

  nav.main { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 34px); }
  nav.main a.navlink {
    font-size: 12.5px; letter-spacing: 0.05em; font-weight: 500;
    position: relative; padding: 4px 0; color: var(--ink);
  }
  nav.main a.navlink::after {
    content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
    background: var(--redline); transition: width .3s ease;
  }
  nav.main a.navlink:hover::after { width: 100%; }
  @media (max-width: 860px) { nav.main .navlink { display: none; } }

  .tools { display: flex; align-items: center; gap: 10px; }
  .lang-toggle {
    display: flex; border: 1px solid var(--line-2); border-radius: 100px; overflow: hidden;
    font-family: var(--ff-mono); font-size: 10.5px; letter-spacing: 0.1em;
  }
  .lang-toggle button {
    background: none; border: 0; color: var(--stone); cursor: pointer;
    padding: 6px 10px; font: inherit; letter-spacing: inherit; transition: all .25s;
  }
  .lang-toggle button.active { background: var(--ink); color: var(--paper); }
  .icon-btn {
    width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line-2);
    background: none; color: var(--ink); cursor: pointer; display: grid; place-items: center;
    transition: border-color .25s, transform .3s;
  }
  .icon-btn:hover { border-color: var(--redline); transform: rotate(-18deg); }
  .icon-btn svg { width: 16px; height: 16px; }

  /* ---------- HERO ---------- */
  .hero {
    position: relative; min-height: 100svh;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding-bottom: clamp(40px, 7vw, 84px); padding-top: 120px;
    overflow: hidden;
  }
  .hero .grid-bg {
    position: absolute; inset: 0; z-index: 0; pointer-events: none;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: clamp(56px, 9vw, 104px) clamp(56px, 9vw, 104px);
    -webkit-mask-image: radial-gradient(120% 90% at 78% 12%, #000 0%, transparent 72%);
            mask-image: radial-gradient(120% 90% at 78% 12%, #000 0%, transparent 72%);
    opacity: .8;
  }
  .hero .plan-line { position: absolute; inset: 0; z-index: 0; pointer-events: none; color: var(--redline); opacity: .5; }
  .hero-inner { position: relative; z-index: 2; }
  .hero .kick {
    display: flex; gap: 16px; align-items: center; margin-bottom: clamp(22px, 4vw, 40px);
  }
  .hero .kick .rule { height: 1px; width: clamp(40px, 8vw, 96px); background: var(--ink); }
  .hero h1 {
    font-family: var(--ff-display);
    font-weight: 800;
    font-size: clamp(48px, 12.5vw, 172px);
    line-height: 0.9; letter-spacing: -0.02em; margin: 0;
    text-wrap: balance;
  }
  .hero h1 .thin { font-weight: 300; letter-spacing: -0.01em; }
  .hero h1 em { font-style: normal; color: var(--redline); }
  .hero .sub {
    display: flex; flex-wrap: wrap; gap: 10px 26px; align-items: baseline;
    margin-top: clamp(26px, 4vw, 46px); max-width: 640px;
  }
  .hero .sub p { margin: 0; font-size: clamp(15px, 1.7vw, 18px); color: var(--ink-soft); max-width: 46ch; }
  .scrollcue {
    position: absolute; left: var(--gut); bottom: 26px; z-index: 2;
    display: flex; align-items: center; gap: 10px;
  }
  .scrollcue .bar { width: 1px; height: 34px; background: var(--line-2); position: relative; overflow: hidden; }
  .scrollcue .bar::after {
    content:""; position:absolute; left:0; top:-100%; width:100%; height:100%;
    background: var(--redline); animation: drop 2.4s cubic-bezier(.7,0,.3,1) infinite;
  }
  @keyframes drop { 0%{top:-100%} 60%,100%{top:100%} }
  @media (prefers-reduced-motion: reduce){ .scrollcue .bar::after{ animation:none; } }

  /* ---------- SECTION SCAFFOLD ---------- */
  section { position: relative; }
  .sec-head {
    display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
    padding-top: 22px; margin-bottom: clamp(38px, 6vw, 72px);
    border-top: 1px solid var(--ink);
    position: relative;
  }
  .sec-head::before {
    content:""; position:absolute; top:-1px; left:0; width:64px; height:3px; background: var(--redline);
  }
  .sec-head h2 {
    font-family: var(--ff-display); font-weight: 700;
    font-size: clamp(26px, 4.4vw, 52px); letter-spacing: -0.015em; margin: 0; line-height: 1;
    text-wrap: balance;
  }
  .sec-head .idx { flex-shrink: 0; }

  .reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
  .reveal.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce){ .reveal { opacity:1; transform:none; } }

  /* ---------- PROJECTS ---------- */
  #projeler { padding-top: var(--sec); }
  .proj-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(18px, 3vw, 40px) clamp(18px, 2.6vw, 34px); }
  .proj { position: relative; grid-column: span 6; display: block; }
  .proj.wide { grid-column: span 8; }
  .proj.narrow { grid-column: span 4; }
  .proj.full { grid-column: span 12; }
  @media (max-width: 780px){
    .proj, .proj.wide, .proj.narrow, .proj.full { grid-column: span 12; }
  }
  .plate {
    position: relative; aspect-ratio: 4/3; background: var(--panel);
    border: 1px solid var(--line-2); overflow: hidden;
    display: grid; place-items: center;
  }
  .proj.full .plate { aspect-ratio: 16/9; }
  .proj.narrow .plate { aspect-ratio: 3/4; }
  .plate img {
    width: 100%; height: 100%; object-fit: cover; display: block;
    transition: transform 1s cubic-bezier(.2,.7,.2,1), filter .5s;
    filter: saturate(1.02);
  }
  .proj:hover .plate img { transform: scale(1.05); }
  .plate svg { width: 84%; height: 84%; color: var(--ink); opacity: .78; transition: transform .9s cubic-bezier(.2,.7,.2,1), opacity .5s; }
  .proj:hover .plate svg { transform: scale(1.04); opacity: 1; }
  .plate .tick {
    position: absolute; top: 12px; left: 12px; z-index: 2; font-family: var(--ff-mono);
    font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
    color: #fff; background: rgba(20,19,17,.5); padding: 4px 8px; backdrop-filter: blur(3px);
  }
  .plate .cornerno {
    position: absolute; bottom: 10px; right: 12px; z-index: 2; font-family: var(--ff-display);
    font-weight: 800; font-size: 13px; color: #fff; text-shadow: 0 1px 6px rgba(0,0,0,.5);
  }
  .plate::after {
    content:""; position:absolute; inset:0; background: var(--redline);
    mix-blend-mode: normal; opacity: 0; transition: opacity .4s;
    clip-path: polygon(0 0, 42px 0, 0 42px);
  }
  .proj:hover .plate::after { opacity: 1; }
  .proj-meta { display: flex; justify-content: space-between; gap: 16px; padding-top: 12px; align-items: baseline; }
  .proj-meta h3 { font-family: var(--ff-display); font-weight: 600; font-size: clamp(16px, 1.8vw, 20px); margin: 0; letter-spacing: -0.01em; }
  .proj-meta .loc { margin-top: 2px; }
  .proj-meta .yr { font-family: var(--ff-mono); font-size: 12px; color: var(--stone); flex-shrink: 0; }
  .proj .arrow { display:inline-block; transition: transform .3s; color: var(--redline); }
  .proj:hover .arrow { transform: translateX(5px); }

  /* ---------- ABOUT ---------- */
  #hakkimizda { padding-top: var(--sec); }
  .about-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(34px, 6vw, 88px); align-items: start; }
  @media (max-width: 880px){ .about-grid { grid-template-columns: 1fr; } }
  .about-lead {
    font-family: var(--ff-display); font-weight: 300;
    font-size: clamp(23px, 3.3vw, 40px); line-height: 1.18; letter-spacing: -0.015em; margin: 0 0 30px;
    text-wrap: balance;
  }
  .about-lead b { font-weight: 700; }
  .about-lead em { font-style: normal; color: var(--redline); }
  .about-body p { color: var(--ink-soft); margin: 0 0 18px; max-width: 54ch; }
  .about-side { border-left: 1px solid var(--line-2); padding-left: clamp(20px, 3vw, 40px); }
  .portrait {
    aspect-ratio: 4/5; background: var(--panel); border: 1px solid var(--line-2);
    display: grid; place-items: center; margin-bottom: 20px; overflow: hidden;
  }
  .portrait svg { width: 70%; color: var(--ink); opacity: .72; }
  .factlist { list-style: none; margin: 0; padding: 0; }
  .factlist li { display: flex; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); }
  .factlist li:first-child { border-top: 1px solid var(--line); }
  .factlist .k { color: var(--stone); font-family: var(--ff-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
  .factlist .v { font-weight: 500; text-align: right; }

  /* ---------- SERVICES ---------- */
  #hizmetler { padding-top: var(--sec); }
  .svc-list { border-top: 1px solid var(--line-2); }
  .svc {
    display: grid; grid-template-columns: 90px 1fr auto; gap: clamp(16px, 4vw, 60px); align-items: center;
    padding: clamp(24px, 3.4vw, 40px) 0; border-bottom: 1px solid var(--line-2);
    position: relative; transition: padding-left .4s cubic-bezier(.2,.7,.2,1);
  }
  .svc::before {
    content:""; position:absolute; left:0; top:0; bottom:0; width:0; background: var(--redline);
    transition: width .4s cubic-bezier(.2,.7,.2,1);
  }
  .svc:hover { padding-left: 26px; }
  .svc:hover::before { width: 3px; }
  .svc .no { font-family: var(--ff-mono); font-size: 12px; color: var(--stone); letter-spacing: .1em; }
  .svc h3 { font-family: var(--ff-display); font-weight: 600; font-size: clamp(21px, 3vw, 34px); margin: 0; letter-spacing: -0.015em; }
  .svc p { margin: 6px 0 0; color: var(--ink-soft); max-width: 52ch; font-size: 15px; }
  .svc .plus { color: var(--stone); transition: color .3s, transform .3s; }
  .svc:hover .plus { color: var(--redline); transform: rotate(90deg); }
  @media (max-width: 640px){
    .svc { grid-template-columns: 1fr; gap: 8px; }
    .svc .plus { display: none; }
  }

  /* ---------- CONTACT ---------- */
  #iletisim { padding-top: var(--sec); padding-bottom: 0; }
  .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(34px, 6vw, 80px); align-items: start; }
  @media (max-width: 880px){ .contact-grid { grid-template-columns: 1fr; } }
  .contact-big {
    font-family: var(--ff-display); font-weight: 700;
    font-size: clamp(30px, 6vw, 74px); line-height: .98; letter-spacing: -0.02em; margin: 0 0 30px;
  }
  .contact-big a { position: relative; }
  .contact-big a::after { content:""; position:absolute; left:0; bottom:6px; height:2px; width:100%; background: var(--redline); transform: scaleX(0); transform-origin: left; transition: transform .4s; }
  .contact-big a:hover::after { transform: scaleX(1); }
  .clist { list-style: none; margin: 0; padding: 0; }
  .clist li { padding: 16px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 96px 1fr; gap: 16px; align-items: baseline; }
  .clist li:first-child { border-top: 1px solid var(--line); }
  .clist .k { font-family: var(--ff-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--stone); }
  .clist .v { font-size: 15px; }
  .clist .v a:hover { color: var(--redline); }

  form.contact { display: grid; gap: 16px; }
  .field { display: grid; gap: 7px; }
  .field label { font-family: var(--ff-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--stone); }
  .field input, .field textarea {
    background: transparent; border: 0; border-bottom: 1px solid var(--line-2); color: var(--ink);
    font-family: var(--ff-body); font-size: 16px; padding: 8px 0; transition: border-color .3s;
  }
  .field input:focus, .field textarea:focus { outline: none; border-color: var(--redline); }
  .field textarea { resize: vertical; min-height: 70px; }
  .btn {
    justify-self: start; margin-top: 6px; background: var(--ink); color: var(--paper);
    border: 0; padding: 14px 30px; font-family: var(--ff-display); font-weight: 600; font-size: 14px;
    letter-spacing: .03em; cursor: pointer; display: inline-flex; align-items: center; gap: 12px;
    transition: gap .3s, background .3s;
  }
  .btn:hover { gap: 20px; background: var(--redline); }
  .btn svg { width: 15px; height: 15px; }

  /* ---------- FOOTER ---------- */
  footer { margin-top: var(--sec); border-top: 1px solid var(--ink); }
  .foot-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; flex-wrap: wrap; padding: 46px 0 40px; }
  .foot-lockup { display: inline-flex; }
  .logo-foot { width: clamp(200px, 40vw, 420px); height: auto; display: block; }
  .foot-links { display: flex; gap: 40px; flex-wrap: wrap; }
  .foot-col { display: grid; gap: 10px; }
  .foot-col a { font-size: 14px; color: var(--ink-soft); }
  .foot-col a:hover { color: var(--redline); }
  .foot-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 20px 0 30px; border-top: 1px solid var(--line); }
  .foot-bottom .mono { font-size: 10.5px; }
  .hp { position: absolute; left: -9999px; }
  .form-note { margin: 8px 0 0; font-family: var(--ff-mono); font-size: 12px; letter-spacing: .04em; color: var(--ink); }
  .form-note.ok::before { content: "\2713 "; color: var(--redline); font-weight: 700; }

  /* ---- pull quotes ---- */
  .pq { padding-left: clamp(16px,2.5vw,26px); border-left: 2px solid var(--redline); }
  .pq blockquote { margin: 0; font-family: var(--ff-display); font-weight: 300; font-size: clamp(18px,2.1vw,25px); line-height: 1.3; letter-spacing: -0.01em; text-wrap: balance; }
  .pq figcaption { margin-top: 12px; font-family: var(--ff-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--stone); }
  .quotes-band { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(26px,4vw,50px); margin-top: clamp(46px,7vw,84px); }
  @media (max-width: 720px){ .quotes-band { grid-template-columns: 1fr; } }

  /* ---- approach ---- */
  .approach { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 34px; margin-top: 42px; }
  @media (max-width: 620px){ .approach { grid-template-columns: 1fr; } }
  .appr-item { border-top: 1px solid var(--line); padding-top: 14px; }
  .appr-item .n { font-family: var(--ff-mono); font-size: 11px; color: var(--redline); letter-spacing: .12em; }
  .appr-item h4 { font-family: var(--ff-display); font-weight: 600; font-size: 16px; margin: 6px 0 5px; letter-spacing: -0.01em; }
  .appr-item p { margin: 0; font-size: 14px; color: var(--ink-soft); }

  /* ---- bio ---- */
  .bio-name { font-family: var(--ff-display); font-weight: 700; font-size: clamp(20px,2.4vw,26px); margin: 6px 0 4px; letter-spacing: -0.01em; }
  .bio-role { margin-bottom: 16px; }
  .bio-body p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.6; margin: 0 0 14px; }

  /* ---- services epigraph + interior quotes ---- */
  .sec-epigraph { font-family: var(--ff-display); font-weight: 300; font-size: clamp(18px,2.1vw,24px); color: var(--ink); max-width: 62ch; margin: 0 0 clamp(34px,5vw,58px); text-wrap: balance; line-height: 1.3; }
  .interior-quotes { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(22px,3vw,44px); margin-top: clamp(42px,6vw,72px); }
  @media (max-width: 720px){ .interior-quotes { grid-template-columns: 1fr; } }

  /* ---- FAQ ---- */
  #sss { padding-top: var(--sec); }
  .faq { border-top: 1px solid var(--line-2); }
  .faq details { border-bottom: 1px solid var(--line-2); }
  .faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 22px; align-items: baseline; padding: 22px 0; font-family: var(--ff-display); font-weight: 600; font-size: clamp(16px,1.9vw,21px); letter-spacing: -0.01em; transition: color .25s; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after { content: "+"; font-family: var(--ff-mono); font-size: 20px; line-height: 1; color: var(--stone); transition: color .3s; flex-shrink: 0; }
  .faq details[open] summary::after { content: "\2013"; color: var(--redline); }
  .faq summary:hover { color: var(--redline); }
  .faq-a { padding: 0 44px 24px 0; color: var(--ink-soft); font-size: 15px; line-height: 1.65; max-width: 76ch; margin: -4px 0 0; }