:root {
  --ink: #111111;
  --soft-ink: #3f3f3f;
  --muted: #777777;
  --line: #e8e8e8;
  --paper: #fbfbf9;
  --white: #ffffff;
  --mist: #f2f2ef;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px clamp(22px, 5vw, 72px);
  color: var(--ink);
  background: rgba(251, 251, 249, 0.82);
  border-bottom: 1px solid rgba(17, 17, 17, 0.06);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  font-size: 1.02rem;
  font-weight: 750;
}

.brand-mark {
  display: block;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(17, 17, 17, 0.12);
  border-radius: 50%;
  background:
    linear-gradient(rgba(251, 251, 249, 0.06), rgba(251, 251, 249, 0.06)),
    url("assets/cenk-portrait.jpg") center 32% / cover no-repeat,
    var(--white);
  filter: grayscale(1) contrast(1.04);
  box-shadow: 0 10px 28px rgba(17, 17, 17, 0.08);
}

.brand-name {
  color: var(--ink);
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 34px);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--ink);
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
}

.language-button {
  min-width: 38px;
  min-height: 30px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 650;
  cursor: pointer;
}

.language-button.is-active {
  color: var(--white);
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 15%, rgba(255, 255, 255, 0.9), transparent 34%),
    linear-gradient(180deg, var(--white), var(--mist));
}

.signal-canvas,
.hero-overlay,
.portrait-shadow {
  position: absolute;
  inset: 0;
}

.signal-canvas {
  width: 100%;
  height: 100%;
  opacity: 0.06;
  filter: grayscale(1);
}

.portrait-shadow {
  left: auto;
  width: min(54vw, 720px);
  min-width: 420px;
  background:
    linear-gradient(90deg, rgba(251, 251, 249, 0), rgba(251, 251, 249, 0.04) 44%, rgba(251, 251, 249, 0.28) 100%),
    url("assets/cenk-portrait.jpg") center right / cover no-repeat;
  filter: grayscale(1) contrast(1.12);
  opacity: 0.42;
  mix-blend-mode: multiply;
  mask-image: linear-gradient(90deg, transparent 0%, #000 18%, #000 72%, transparent 100%);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(251, 251, 249, 0.98) 0%, rgba(251, 251, 249, 0.9) 48%, rgba(251, 251, 249, 0.28) 100%),
    linear-gradient(180deg, rgba(251, 251, 249, 0.32), rgba(251, 251, 249, 0.94));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(980px, calc(100% - 44px));
  margin: 0 auto;
  padding: 142px 0 72px;
  text-align: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section > .section-kicker {
  text-align: center;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 980px;
  margin: 0 auto 22px;
  font-size: clamp(3.6rem, 11vw, 8.8rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 720px;
  margin: 0 auto 34px;
  color: var(--soft-ink);
  font-size: clamp(1.12rem, 2vw, 1.45rem);
  font-weight: 400;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 50px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 19px;
  font-size: 0.94rem;
  font-weight: 600;
}

.button.primary {
  color: var(--white);
  background: var(--ink);
}

.button.secondary {
  color: var(--ink);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.54);
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr;
  justify-content: center;
  gap: 22px;
  width: min(640px, 100%);
  margin: 0 auto;
  padding-top: 28px;
  border-top: 1px solid rgba(17, 17, 17, 0.12);
  text-align: center;
}

.hero-stats div {
  display: grid;
  gap: 4px;
  max-width: 100%;
}

.hero-stats dt {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-stats dd {
  margin: 0;
  color: var(--ink);
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  font-weight: 600;
}

.section {
  padding: clamp(76px, 10vw, 132px) clamp(22px, 5vw, 72px);
}

.intro-section,
.ventures-section,
.collaboration-section {
  background: var(--paper);
}

.intro-grid {
  display: grid;
  gap: 26px;
  max-width: 900px;
  margin: 0 auto;
  align-items: start;
  text-align: center;
}

.intro-grid h2,
.section-heading h2,
.quote-panel h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4.8vw, 4rem);
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: 0;
}

.intro-copy {
  color: var(--soft-ink);
  font-size: 1.04rem;
  max-width: 680px;
  margin: 0 auto;
}

.intro-copy p:last-child {
  margin-bottom: 0;
}

.dark-band {
  color: var(--ink);
  background: var(--white);
  border-block: 1px solid var(--line);
}

.section-heading {
  max-width: 940px;
  margin: 0 auto 44px;
  text-align: center;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 1080px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--line);
}

.focus-card {
  min-height: 260px;
  padding: 26px;
  background: var(--white);
}

.focus-card h3 {
  margin-bottom: 12px;
  font-size: 1.12rem;
  font-weight: 650;
}

.focus-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.venture-list {
  display: grid;
  max-width: 1080px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.venture-link {
  display: grid;
  gap: 10px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.venture-link span {
  color: var(--muted);
  font-weight: 600;
}

.venture-link strong {
  color: var(--ink);
  font-size: clamp(1.16rem, 2.2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.18;
}

.venture-link:hover strong {
  color: var(--soft-ink);
}

.quote-panel {
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.quote-mark {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 4.2rem;
  font-weight: 400;
  line-height: 0.65;
}

.quote-panel p:last-child {
  max-width: 700px;
  margin: 26px auto 0;
  color: var(--soft-ink);
  font-size: 1.08rem;
}

.contact-section {
  background: var(--white);
  border-top: 1px solid var(--line);
}

.contact-shell {
  max-width: 760px;
  margin: 0 auto;
}

.contact-heading {
  margin-bottom: 34px;
}

.contact-heading p {
  max-width: 560px;
  margin: 20px auto 0;
  color: var(--soft-ink);
  font-size: 1.05rem;
}

.contact-form {
  display: grid;
  gap: 16px;
  width: 100%;
  margin: 0 auto;
}

.form-field {
  display: grid;
  gap: 8px;
  color: var(--soft-ink);
  font-size: 0.92rem;
  font-weight: 600;
}

.form-field input,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 15px 16px;
  color: var(--ink);
  background: var(--white);
  font: inherit;
  font-weight: 400;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.form-field textarea {
  resize: vertical;
  min-height: 150px;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: #b8b8b8;
  box-shadow: 0 0 0 4px rgba(17, 17, 17, 0.04);
}

.verification-field {
  grid-template-columns: 1fr;
}

.verification-question {
  color: var(--ink);
  font-size: 1.02rem;
}

.hidden-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
}

.form-error {
  min-height: 1.4em;
  margin: 0;
  color: #9a1f1f;
  font-size: 0.92rem;
  text-align: center;
}

.form-submit {
  justify-self: center;
  min-width: 180px;
  border: 0;
  cursor: pointer;
}

.site-footer {
  padding: 28px clamp(22px, 5vw, 72px);
  color: var(--muted);
  background: var(--paper);
  border-top: 1px solid var(--line);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
}

@media (max-width: 900px) {
  .focus-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intro-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header {
    position: absolute;
    padding: 18px;
  }

  .brand span:last-child {
    display: inline;
  }

  .brand-name {
    max-width: 138px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .nav {
    gap: 14px;
    font-size: 0.84rem;
  }

  .language-switcher {
    position: absolute;
    top: 62px;
    right: 18px;
  }

  .hero-content {
    width: min(100% - 32px, 980px);
    padding-top: 116px;
    text-align: center;
  }

  .portrait-shadow {
    width: 82vw;
    min-width: 0;
    opacity: 0.2;
    background-position: 62% center;
  }

  h1 {
    font-size: clamp(3.1rem, 17vw, 5rem);
  }

  .hero-lede {
    margin-inline: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    gap: 18px;
  }

  .focus-grid {
    grid-template-columns: 1fr;
  }

  .focus-card {
    padding: 18px;
  }

  .contact-shell {
    max-width: 100%;
  }
}