:root {
    --paper: #F6F6F1;
    --white: #FFFFFF;
    --ink: #0D0D0C;
    --ink-2: #161615;
    --muted: #5B5B54;
    --rule: #D8D7CF;
    --rule-dark: #35352F;
    --on-dark-muted: #B7B7AE;
    --lime: #C4E804;          /* logodaki nokta rengi */
    --serif: "Bodoni Moda", "Bodoni 72", Didot, "Times New Roman", serif;
    --sans: "Hanken Grotesk", "Helvetica Neue", Arial, sans-serif;
    color-scheme: light;
    box-sizing: border-box;
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }
  html { scroll-padding-top: calc(4.75rem + env(safe-area-inset-top, 0px)); scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  *, *::before, *::after { box-sizing: border-box; }
  [hidden] { display: none !important; }
  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 1.0625rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }
  ul, ol { padding: 0; list-style: none; }
  img { display: block; max-width: 100%; height: auto; }
  a { color: inherit; }
  p { text-wrap: pretty; }
  h1, h2, h3 { text-wrap: balance; }
  :focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
  .dark :focus-visible { outline-color: var(--lime); }

  .wrap { width: 100%; max-width: 76rem; margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 2.5rem); }
  .skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: .75rem 1rem; z-index: 100; }
  .skip:focus { left: 0; }

  /* Tipografi */
  .display, h2.title {
    font-family: var(--serif);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.04;
  }
  .display { font-size: clamp(2.5rem, 7.4vw, 4.75rem); }
  h2.title { font-size: clamp(2.1rem, 5.4vw, 3.4rem); letter-spacing: -0.015em; }
  .lead { font-size: clamp(1.125rem, 2.2vw, 1.3rem); color: var(--muted); max-width: 40rem; }
  .num { font-size: .95rem; font-weight: 600; color: var(--muted); letter-spacing: .02em; }

  /* Butonlar */
  .btn {
    display: inline-flex; align-items: center; justify-content: center;
    min-height: 3.25rem; padding: .8rem 1.6rem;
    font: 600 1.0625rem/1.2 var(--sans);
    text-decoration: none; text-align: center;
    border: 1.5px solid var(--ink); border-radius: 4px;
    background: transparent; color: var(--ink); cursor: pointer;
    transition: background-color .15s, color .15s, border-color .15s;
  }
  .btn-primary { background: var(--lime); border-color: var(--lime); color: var(--ink); }
  .btn-primary:hover { background: var(--ink); border-color: var(--ink); color: var(--lime); }
  .btn-ghost:hover { background: var(--ink); color: #fff; }
  .btn-sm { min-height: 2.75rem; padding: .4rem .7rem; font-size: .875rem; line-height: 1.15; flex: 0 1 auto; }
  @media (min-width: 480px) { .btn-sm { padding: .5rem 1rem; font-size: .975rem; white-space: nowrap; } }
  .dark .btn-primary:hover { background: #fff; border-color: #fff; color: var(--ink); }
  .dark .btn-ghost { border-color: rgba(255,255,255,.45); color: #fff; }
  .dark .btn-ghost:hover { background: #fff; color: var(--ink); }
  .btn[disabled] { opacity: .6; cursor: progress; }

  /* Header */
  .site-header {
    position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
    background: var(--paper); border-bottom: 1px solid var(--rule);
  }
  .bar { position: relative; display: flex; align-items: center; gap: .75rem; min-height: 4.25rem; }
  .logo { flex: 1 1 auto; display: block; }
  .logo img { width: clamp(6.75rem, 30vw, 12rem); height: auto; }
  .menu-btn {
    flex: none; width: 2.75rem; height: 2.75rem; padding: 0; display: grid; place-items: center;
    background: transparent; color: var(--ink); border: 1.5px solid var(--rule); border-radius: 4px; cursor: pointer;
  }
  .menu-btn svg { width: 1.25rem; height: 1.25rem; }
  .menu-btn .x { display: none; }
  .menu-btn[aria-expanded="true"] .bars { display: none; }
  .menu-btn[aria-expanded="true"] .x { display: block; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: var(--paper); border-bottom: 1px solid var(--rule);
    padding: .5rem clamp(1.25rem, 4vw, 2.5rem) 1rem;
  }
  .nav.open { display: block; }
  .nav a { display: block; padding: .85rem 0; text-decoration: none; font-weight: 500; font-size: 1.0625rem; border-bottom: 1px solid var(--rule); }
  .nav a:last-child { border-bottom: 0; }
  @media (min-width: 1080px) {
    .menu-btn { display: none; }
    .logo { flex: 0 0 auto; }
    .nav { display: flex; position: static; background: none; border: 0; padding: 0; gap: 1.75rem; margin-left: auto; margin-right: 1rem; }
    .nav a { padding: .25rem 0; border: 0; font-size: 1rem; color: var(--muted); }
    .nav a:hover { color: var(--ink); }
  }

  /* Hero */
  .hero { padding-top: clamp(2.5rem, 7vw, 5.5rem); }
  .hero-grid { display: grid; gap: 2rem; }
  .hero h1 {
    font-family: var(--serif); font-weight: 500;
    font-size: clamp(2.75rem, 9.6vw, 5.5rem);
    line-height: 1.02; letter-spacing: -0.02em;
  }
  .hero h1 .stop { color: var(--lime); }
  .hero .lede { margin-top: 1.5rem; font-size: clamp(1.15rem, 2.4vw, 1.3rem); color: var(--muted); max-width: 34rem; }
  .hero .actions { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: .75rem; }
  .hero .actions .btn { flex: 1 1 13rem; }
  .hero-flow { display: none; }
  @media (min-width: 900px) {
    .hero-grid { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); align-items: center; gap: 3rem; }
    .hero .actions .btn { flex: 0 0 auto; }
    .hero-flow { display: block; width: 100%; max-width: 30rem; height: auto; justify-self: end; overflow: visible; }
  }
  .hero-flow text { font-family: var(--sans); font-size: 15px; font-weight: 600; fill: var(--ink); }
  .hero-flow .sub { font-weight: 500; fill: var(--muted); font-size: 14px; }
  .hero-flow .grid path { stroke: var(--rule); stroke-width: 1; fill: none; }
  .hero-flow .line { fill: none; stroke: var(--ink); stroke-width: 1.5; }
  .hero-flow .tick { stroke: var(--ink); stroke-width: 1.5; fill: none; }
  .hero-flow .node { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
  .hero-flow .goal { fill: var(--lime); stroke: var(--ink); stroke-width: 1.5; }
  @media (prefers-reduced-motion: no-preference) {
    .hero-flow .line { stroke-dasharray: 1; animation: flowdraw 1.3s cubic-bezier(.3,.6,.2,1) both; }
    .hero-flow .line:nth-of-type(2) { animation-delay: .12s; }
    .hero-flow .line:nth-of-type(3) { animation-delay: .24s; }
    .hero-flow .goal, .hero-flow .goal-label { animation: flowin .5s ease-out 1.1s both; }
    @keyframes flowdraw { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }
    @keyframes flowin { from { opacity: 0; } }
  }

  .platforms { margin-top: clamp(2.5rem, 6vw, 4.5rem); border-top: 1.5px solid var(--ink); display: grid; }
  .platforms li { padding: 1rem 0; border-bottom: 1px solid var(--rule); }
  .platforms strong { display: block; font-size: 1.125rem; font-weight: 600; }
  .platforms span { color: var(--muted); font-size: 1rem; }
  @media (min-width: 760px) {
    .platforms { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 2.5rem; }
    .platforms li { border-bottom: 0; padding: 1.25rem 0 0; }
  }

  /* Bölüm iskeleti */
  .block { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
  .block-white { background: var(--white); }
  .block-rule { border-top: 1px solid var(--rule); }
  .grid2 { display: grid; gap: 2rem 4rem; }
  @media (min-width: 900px) { .grid2 { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); } }

  /* Problem / içgörü */
  .insight .lead { color: var(--ink); max-width: 36rem; }
  .system { margin-top: 2rem; padding-top: 1.25rem; border-top: 1.5px solid var(--ink); font-weight: 600; font-size: clamp(1.2rem, 2.5vw, 1.5rem); line-height: 1.35; max-width: 36rem; }

  /* Hizmetler */
  .svc-intro { padding-top: clamp(3.5rem, 8vw, 6.5rem); padding-bottom: clamp(2rem, 5vw, 3.5rem); }
  .svc-intro .lead { margin-top: 1rem; }

  .feature { background: var(--ink); color: #fff; padding-block: clamp(3rem, 7vw, 5.5rem); }
  .feature .num { color: var(--lime); }
  .feature h3 { font-family: var(--serif); font-weight: 500; font-size: clamp(2.4rem, 6.5vw, 4.25rem); line-height: 1.02; letter-spacing: -0.02em; margin-top: .5rem; }
  .feature .lead { color: #E4E4DC; margin-top: 1.5rem; }
  .feature .aim { margin-top: 1.25rem; max-width: 40rem; color: var(--on-dark-muted); }
  .feature .cta { margin-top: 2rem; }
  .feature-grid { display: grid; gap: 2.5rem 4rem; }
  @media (min-width: 900px) { .feature-grid { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); align-items: start; } }
  .scope-title { font-size: 1.05rem; font-weight: 600; margin-bottom: .5rem; }
  .scope li { padding: .8rem 0; border-bottom: 1px solid var(--rule-dark); font-size: 1.0625rem; }
  .scope li:first-child { border-top: 1px solid var(--rule-dark); }
  .ai-note { margin-top: 1rem; font-size: .975rem; color: var(--on-dark-muted); }

  .platform-list { margin-top: clamp(2.5rem, 5vw, 4rem); display: grid; }
  .platform-list li { padding: 1.5rem 0; border-top: 1px solid var(--rule-dark); }
  .platform-list h4 { margin: 0; font-family: var(--sans); font-weight: 700; font-size: 1.4rem; letter-spacing: -0.01em; line-height: 1.2; display: flex; align-items: center; gap: .6rem; }
  .platform-list h4::before { content: ""; flex: none; width: .6rem; height: .6rem; border-radius: 50%; background: var(--lime); }
  .platform-list p { margin-top: .6rem; color: var(--on-dark-muted); max-width: 26rem; }
  @media (min-width: 900px) { .platform-list { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 2.5rem; } }

  .more { padding-block: clamp(2rem, 5vw, 3.5rem) clamp(3.5rem, 8vw, 6rem); }
  .svc { display: grid; gap: .75rem 2rem; padding-block: clamp(1.75rem, 4vw, 2.5rem); border-top: 1px solid var(--rule); }
  .svc:last-of-type { border-bottom: 1px solid var(--rule); }
  .svc h3 { font-family: var(--sans); font-weight: 700; font-size: clamp(1.5rem, 3vw, 1.9rem); line-height: 1.15; letter-spacing: -0.02em; margin-top: .2rem; }
  .svc .sub { margin-top: .5rem; font-weight: 500; font-size: 1rem; color: var(--muted); }
  .svc .body p + p { margin-top: .9rem; }
  .svc .note { color: var(--muted); font-size: 1rem; }
  .topics { margin-top: .75rem; display: grid; gap: .1rem 2rem; }
  .topics li { padding: .35rem 0 .35rem 1.1rem; position: relative; }
  .topics li::before { content: ""; position: absolute; left: 0; top: 1.05em; width: .4rem; height: .4rem; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 1px var(--ink); }
  @media (min-width: 900px) {
    .svc { grid-template-columns: 3rem minmax(0, 5fr) minmax(0, 6fr); align-items: start; }
    .topics { grid-template-columns: 1fr 1fr; }
  }
  .more-cta { margin-top: 2rem; }
  .more-cta a { font-weight: 600; text-underline-offset: .25em; text-decoration-thickness: 2px; text-decoration-color: var(--lime); }
  .more-cta a:hover { text-decoration-color: var(--ink); }

  /* Yaklaşımımız */
  .approach .lead { margin-top: 1rem; }
  .steps { margin-top: clamp(2.5rem, 5vw, 3.5rem); display: grid; }
  .steps li { position: relative; padding: 0 0 2rem 2rem; border-left: 1.5px solid var(--ink); }
  .steps li:last-child { padding-bottom: 0; }
  .steps li::before { content: ""; position: absolute; left: -8px; top: .6rem; width: 14px; height: 14px; border-radius: 50%; background: var(--lime); border: 1.5px solid var(--ink); }
  .steps h3 { font-family: var(--sans); font-weight: 700; font-size: 1.6rem; letter-spacing: -0.015em; line-height: 1.15; margin-bottom: .4rem; }
  .steps p { color: var(--muted); }
  @media (min-width: 900px) {
    .steps { grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1.5px solid var(--ink); }
    .steps li { padding: 2rem 1.5rem 0 0; border-left: 0; }
    .steps li::before { left: 0; top: -8px; }
  }

  /* Sonuçlar */
  .proof-body p:first-child { font-size: clamp(1.1rem, 2.2vw, 1.25rem); max-width: 36rem; }
  .loop { margin-top: 2rem; padding-top: 1.25rem; border-top: 1.5px solid var(--ink); display: flex; flex-wrap: wrap; align-items: baseline; gap: .35rem 1rem; font-weight: 700; font-size: clamp(1.4rem, 3.4vw, 1.9rem); letter-spacing: -0.015em; }
  .loop .arr { color: var(--muted); font-weight: 400; }
  /* Gelecekteki vaka çalışması bileşeni (HTML içindeki yorum şablonuna bakın) */
  .case { border-top: 1.5px solid var(--ink); padding-block: 1.5rem; }
  .case-sector { color: var(--muted); font-size: .95rem; }
  .case-title { font-family: var(--serif); font-weight: 500; font-size: 1.9rem; line-height: 1.1; margin-top: .25rem; }
  .case-summary { margin-top: .75rem; max-width: 40rem; }
  .case-metrics { margin-top: 1.25rem; display: grid; gap: 1rem 2rem; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); }
  .case-metrics dt { color: var(--muted); font-size: .9rem; }
  .case-metrics dd { font-family: var(--serif); font-size: 2rem; line-height: 1.1; font-weight: 500; }

  /* Hakkımızda */
  .about .body p { max-width: 38rem; }
  .about .body p + p { margin-top: 1rem; }
  .about .lead { margin-bottom: 1.25rem; color: var(--ink); }
  .founder { margin-top: 2rem; padding-top: 1.25rem; border-top: 1.5px solid var(--ink); }
  .founder strong { display: block; font-family: var(--serif); font-weight: 500; font-size: 2rem; line-height: 1.1; }
  .founder span { color: var(--muted); }
  .exp { margin-top: 1.5rem; display: grid; }
  .exp li { padding: .7rem 0; border-bottom: 1px solid var(--rule); font-weight: 500; }
  .exp li:first-child { border-top: 1px solid var(--rule); }
  @media (min-width: 600px) { .exp { grid-template-columns: 1fr 1fr; column-gap: 2rem; } .exp li:nth-child(2) { border-top: 1px solid var(--rule); } }

  /* İletişim */
  .contact { background: var(--ink); color: #fff; padding-block: clamp(3.5rem, 8vw, 6rem); }
  .contact h2 { font-family: var(--serif); font-weight: 500; font-size: clamp(2.3rem, 6.2vw, 4rem); line-height: 1.04; letter-spacing: -0.02em; }
  .contact .intro { margin-top: 1.25rem; font-size: 1.2rem; color: #E4E4DC; max-width: 30rem; }
  .contact .mail { margin-top: 1.5rem; }
  .contact .mail a { font-weight: 600; text-underline-offset: .25em; text-decoration-thickness: 2px; text-decoration-color: var(--lime); }
  .form-panel { background: var(--paper); color: var(--ink); border-radius: 4px; padding: clamp(1.25rem, 3vw, 2rem); }
  .fields { display: grid; gap: 1.1rem; }
  .field-row { display: grid; gap: 1.1rem; }
  .req-note { font-size: .9rem; color: var(--muted); }
  @media (min-width: 640px) { .field-row { grid-template-columns: 1fr 1fr; } }
  .field label { display: block; font-size: .95rem; font-weight: 600; margin-bottom: .35rem; }
  .field .req { color: var(--muted); font-weight: 500; }
  .field input, .field select, .field textarea {
    width: 100%; min-height: 3.25rem; padding: .75rem .9rem;
    font: 400 1rem/1.4 var(--sans); color: var(--ink);
    background: #fff; border: 1.5px solid #B9B8AE; border-radius: 4px;
    -webkit-appearance: none; appearance: none;
  }
  .field textarea { min-height: 7rem; resize: vertical; }
  .field select {
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1.5l6 6 6-6' fill='none' stroke='%230D0D0C' stroke-width='1.8'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right .9rem center;
  }
  .field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid var(--ink); outline-offset: 1px; border-color: var(--ink); }
  .field [aria-invalid="true"] { border-color: #B3261E; }
  .err { min-height: 0; margin-top: .3rem; color: #B3261E; font-size: .925rem; font-weight: 500; }
  .err:empty { display: none; }
  .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
  .submit { margin-top: 1.5rem; }
  .submit .btn { width: 100%; }
  .status { margin-top: 1rem; color: #B3261E; font-weight: 500; }
  .status:empty { display: none; }
  .thanks h3 { font-family: var(--serif); font-weight: 500; font-size: 2.2rem; line-height: 1.1; }
  .thanks p { margin-top: .9rem; }
  .thanks .preview-note { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .95rem; }

  /* Footer */
  .site-footer { background: var(--ink); color: #fff; border-top: 1px solid var(--rule-dark); padding-block: clamp(2.5rem, 6vw, 4rem) 2rem; }
  .foot-grid { display: grid; gap: 2rem 3rem; }
  @media (min-width: 900px) { .foot-grid { grid-template-columns: minmax(0, 5fr) minmax(0, 3fr) minmax(0, 4fr); } }
  .foot-brand { font-family: var(--serif); font-weight: 500; font-size: 1.75rem; letter-spacing: .01em; line-height: 1.1; }
  .site-footer p, .site-footer li { color: var(--on-dark-muted); }
  .foot-brand + p { margin-top: .5rem; }
  .site-footer h2 { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: .6rem; }
  .site-footer a { text-underline-offset: .2em; }
  .site-footer a:not([href]) { text-decoration: none; opacity: .6; }
  .foot-list li { padding: .25rem 0; }
  .legal { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule-dark); display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-size: .925rem; }
  .legal li { color: var(--on-dark-muted); opacity: .7; }
  .legal .copy { margin-left: auto; opacity: 1; }