/* ============================================================
   sabahkemal.co — Sabah Kemal Cansu, Product Designer
   Black & white · Inter · minimal editorial
   ============================================================ */

:root {
  --bg: #ffffff;
  --ink: #0a0a0a;
  --gray: #6f6f6f;
  --gray-soft: #9a9a9a;
  --line: #e7e7e7;
  --soft: #f5f5f4;
  --radius: 18px;
  --container: min(1200px, 92vw);
  --ease: cubic-bezier(0.22, 0.61, 0.21, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--ink); color: #fff; }

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

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

.container { width: var(--container); margin-inline: auto; }

/* ---------- typography ---------- */

h1, h2, h3 { font-weight: 600; letter-spacing: -0.03em; line-height: 1.05; }

.display {
  font-size: clamp(2.6rem, 6.8vw, 5.4rem);
  letter-spacing: -0.045em;
  line-height: 1.02;
  text-wrap: balance;
}

.section-title {
  font-size: clamp(1.9rem, 3.8vw, 3.2rem);
  letter-spacing: -0.04em;
}

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-soft);
  display: block;
  margin-bottom: 1.25rem;
}

.lede { color: var(--gray); font-size: clamp(1.0625rem, 1.6vw, 1.25rem); max-width: 40rem; }

/* ---------- nav ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}

.nav-inner {
  width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.nav-name { font-weight: 650; letter-spacing: -0.02em; font-size: 1rem; }

.nav-links { display: flex; gap: 2rem; font-size: 0.9375rem; font-weight: 500; }

.nav-links a { color: var(--gray); transition: color 0.25s var(--ease); position: relative; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }

/* ---------- hero ---------- */

.hero { padding: clamp(9rem, 16vh, 12rem) 0 clamp(4rem, 8vh, 6rem); }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray);
  margin-bottom: 2.25rem;
}

.pill-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #17b26a;
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(23, 178, 106, 0.35); }
  50% { box-shadow: 0 0 0 6px rgba(23, 178, 106, 0); }
}

.hero .lede { margin-top: 2rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.75rem; align-items: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  border-radius: 999px;
  padding: 0.9rem 1.6rem;
  font-weight: 550;
  font-size: 0.9875rem;
  transition: transform 0.35s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); }

.btn-ghost { border: 1px solid var(--line); color: var(--ink); }
.btn-ghost:hover { background: var(--soft); transform: translateY(-2px); }

.hero-meta { margin-top: 3.5rem; color: var(--gray-soft); font-size: 0.9375rem; }

/* ---------- sections ---------- */

.section { padding: clamp(4.5rem, 10vh, 7.5rem) 0; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: clamp(2.5rem, 5vh, 4rem);
}

.section-count { color: var(--gray-soft); font-size: 1rem; font-weight: 500; font-variant-numeric: tabular-nums; }

/* ---------- work grid ---------- */

.work-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem 2.25rem; }

.card { display: block; }
.card--featured { grid-column: 1 / -1; }

.card-media {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--soft);
  aspect-ratio: 4 / 3;
}
.card--featured .card-media { aspect-ratio: 16 / 9; }

.card-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease);
}
.card:hover .card-media img { transform: scale(1.035); }

.card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 1.35rem;
}

.card-title { font-size: 1.4rem; font-weight: 600; letter-spacing: -0.025em; display: inline-flex; align-items: center; gap: 0.5rem; }

.card-arrow { transition: transform 0.35s var(--ease); display: inline-block; }
.card:hover .card-arrow { transform: translate(3px, -3px); }

.card-year { color: var(--gray-soft); font-size: 0.9375rem; font-variant-numeric: tabular-nums; }

.card-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.85rem; }

.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.8rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gray);
}

.chip--stat { background: var(--ink); border-color: var(--ink); color: #fff; }

/* ---------- services ---------- */

.service-row {
  display: grid;
  grid-template-columns: 5rem 1fr 1.15fr;
  gap: 2rem;
  padding: 2.75rem 0;
  border-top: 1px solid var(--line);
}
.service-row:last-child { border-bottom: 1px solid var(--line); }

.service-num { color: var(--gray-soft); font-size: 0.9375rem; font-variant-numeric: tabular-nums; padding-top: 0.4rem; }

.service-title { font-size: clamp(1.35rem, 2.4vw, 1.9rem); letter-spacing: -0.03em; }

.service-desc { color: var(--gray); }

/* ---------- experience ---------- */

.xp-row {
  display: grid;
  grid-template-columns: 1.2fr 1.4fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.6rem 0;
  border-top: 1px solid var(--line);
}
.xp-row:last-child { border-bottom: 1px solid var(--line); }

.xp-company { font-weight: 600; font-size: 1.125rem; letter-spacing: -0.02em; }
.xp-role { color: var(--gray); }
.xp-period { color: var(--gray-soft); font-variant-numeric: tabular-nums; font-size: 0.9375rem; white-space: nowrap; }

/* ---------- about teaser ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
}

.about-photo { border-radius: var(--radius); overflow: hidden; background: var(--soft); }
.about-photo img { width: 100%; height: 100%; object-fit: cover; }

.about-text p { color: var(--gray); margin-bottom: 1.25rem; }
.about-text p strong { color: var(--ink); font-weight: 600; }

.text-link {
  font-weight: 550;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: opacity 0.25s var(--ease);
}
.text-link:hover { opacity: 0.55; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: clamp(3rem, 6vh, 4.5rem);
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.stat-num { font-size: clamp(1.9rem, 3.4vw, 2.8rem); font-weight: 650; letter-spacing: -0.04em; line-height: 1.1; }
.stat-label { color: var(--gray-soft); font-size: 0.9375rem; margin-top: 0.4rem; }

/* ---------- marquee ---------- */

.marquee {
  border-block: 1px solid var(--line);
  overflow: hidden;
  padding: 1.6rem 0;
  user-select: none;
}

.marquee-track {
  display: flex;
  gap: 3.5rem;
  width: max-content;
  animation: marquee 36s linear infinite;
}

.marquee span {
  font-size: 1.35rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  color: var(--gray-soft);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 3.5rem;
}
.marquee span::after { content: "✦"; font-size: 0.8em; color: var(--line); }

@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- case study ---------- */

.case-header { padding: clamp(9rem, 15vh, 11rem) 0 clamp(3rem, 6vh, 4.5rem); }

.case-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: clamp(2.5rem, 5vh, 4rem);
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.meta-label { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-soft); margin-bottom: 0.35rem; }
.meta-value { font-weight: 550; }

.case-cover { border-radius: var(--radius); overflow: hidden; background: var(--soft); }

.case-body { max-width: 45rem; }
.case-body h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -0.03em; margin: 3.5rem 0 1.25rem; }
.case-body h2:first-child { margin-top: 0; }
.case-body p { color: var(--gray); margin-bottom: 1.25rem; }

.case-images { display: grid; gap: 2rem; margin-top: clamp(3rem, 6vh, 4.5rem); }
.case-images figure { border-radius: var(--radius); overflow: hidden; background: var(--soft); }

.case-outcome {
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  padding: clamp(2.5rem, 5vw, 4rem);
  margin-top: clamp(3rem, 6vh, 4.5rem);
}
.case-outcome .stat-num { color: #fff; }
.case-outcome p { color: #b9b9b9; max-width: 38rem; margin-top: 1rem; }

.next-project { border-top: 1px solid var(--line); }
.next-project a { display: block; padding: clamp(3.5rem, 8vh, 5.5rem) 0; }
.next-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  transition: opacity 0.3s var(--ease);
}
.next-project a:hover .next-title { opacity: 0.5; }

/* ---------- about page ---------- */

.prose { max-width: 45rem; }
.prose p { color: var(--gray); margin-bottom: 1.35rem; }
.prose p strong { color: var(--ink); font-weight: 600; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.6rem; }

/* ---------- footer ---------- */

.footer {
  background: var(--ink);
  color: #fff;
  border-radius: 26px 26px 0 0;
  margin-top: clamp(3rem, 8vh, 6rem);
  padding: clamp(4.5rem, 10vh, 7.5rem) 0 2.5rem;
}

.footer .eyebrow { color: #7c7c7c; }

.footer-cta {
  font-size: clamp(2.4rem, 6.5vw, 5rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.05;
  max-width: 18ch;
}

.footer-mail {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 2.5rem;
  font-size: clamp(1.25rem, 2.6vw, 1.9rem);
  font-weight: 550;
  letter-spacing: -0.02em;
  border-bottom: 2px solid #fff;
  padding-bottom: 0.3rem;
  transition: opacity 0.25s var(--ease);
}
.footer-mail:hover { opacity: 0.6; }

.footer-actions { display: flex; flex-wrap: wrap; gap: 1rem 3rem; align-items: baseline; }

.footer-mail--secondary {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: #b9b9b9;
  border-bottom: 1px solid #6f6f6f;
}

.footer-social { display: flex; gap: 2rem; margin-top: clamp(3rem, 6vh, 4.5rem); font-weight: 500; }
.footer-social a { color: #b9b9b9; transition: color 0.25s var(--ease); }
.footer-social a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  margin-top: clamp(3rem, 7vh, 5rem);
  padding-top: 2rem;
  border-top: 1px solid #262626;
  color: #7c7c7c;
  font-size: 0.875rem;
}

/* ---------- AI products ---------- */

.ai-card {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2.5rem, 5vh, 3.5rem) 0;
}
.ai-card + .ai-card { border-top: 1px solid var(--line); }

.ai-media {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--soft);
  aspect-ratio: 16 / 10;
}
.ai-media img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 0.9s var(--ease); }
.ai-media:hover img { transform: scale(1.03); }

.ai-media--word { display: flex; align-items: center; justify-content: center; background: var(--ink); }
.ai-media--word span {
  color: #fff;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 650;
  letter-spacing: -0.04em;
}

.ai-title { font-size: clamp(1.6rem, 3vw, 2.3rem); letter-spacing: -0.035em; margin-top: 0.35rem; }
.ai-desc { color: var(--gray); margin: 1rem 0 1.5rem; }

/* ---------- dark panel / AI-native workflow ---------- */

.dark-panel {
  background: var(--ink);
  color: #fff;
  border-radius: 26px;
  padding: clamp(2.75rem, 6vw, 5.5rem);
}
.dark-panel .eyebrow { color: #7c7c7c; }
.dark-panel .lede { color: #b9b9b9; }

.pipeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.75rem;
  margin-top: clamp(3rem, 6vh, 4.5rem);
}

.pipe-num { color: #7c7c7c; font-size: 0.9375rem; font-variant-numeric: tabular-nums; }
.pipe-title { font-size: 1.4rem; letter-spacing: -0.025em; margin: 0.7rem 0 0.8rem; }
.pipe-desc { color: #b9b9b9; font-size: 0.9875rem; line-height: 1.65; margin-bottom: 1.4rem; }

.chip--dark { border-color: #2c2c2c; background: #161616; color: #d6d6d6; }

/* ---------- blog ---------- */

.post-row {
  display: block;
  padding: 2.1rem 0;
  border-top: 1px solid var(--line);
}
.post-row:last-child { border-bottom: 1px solid var(--line); }

.post-row-title {
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  transition: opacity 0.25s var(--ease);
}
.post-row:hover .post-row-title { opacity: 0.55; }

.post-row-desc { color: var(--gray); margin-top: 0.5rem; max-width: 46rem; }

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  color: var(--gray-soft);
  font-size: 0.875rem;
  margin-top: 0.8rem;
}

.post-body { max-width: 44rem; }
.post-body h2 { font-size: clamp(1.4rem, 2.4vw, 1.75rem); letter-spacing: -0.03em; margin: 2.75rem 0 1rem; }
.post-body h3 { font-size: 1.15rem; letter-spacing: -0.02em; margin: 2rem 0 0.75rem; }
.post-body p { color: var(--gray); margin-bottom: 1.2rem; }
.post-body p strong, .post-body li strong { color: var(--ink); font-weight: 600; }
.post-body ul, .post-body ol { color: var(--gray); margin: 0 0 1.2rem 1.35rem; }
.post-body li { margin-bottom: 0.55rem; }
.post-body a { font-weight: 550; color: var(--ink); border-bottom: 1px solid var(--ink); transition: opacity 0.25s var(--ease); }
.post-body a:hover { opacity: 0.55; }

.faq-item { border-top: 1px solid var(--line); padding: 1.6rem 0; }
.faq-item h3 { font-size: 1.1rem; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
.faq-item p { color: var(--gray); }

.author-box {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 3.5rem;
}
.author-box img { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.author-box p { color: var(--gray); font-size: 0.9375rem; line-height: 1.55; }
.author-box p strong { color: var(--ink); }

/* ---------- reveal ---------- */

[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .work-grid { grid-template-columns: 1fr; gap: 3rem; }
  .card--featured .card-media { aspect-ratio: 4 / 3; }
  .service-row { grid-template-columns: 1fr; gap: 0.6rem; padding: 2.25rem 0; }
  .xp-row { grid-template-columns: 1fr; gap: 0.15rem; padding: 1.4rem 0; }
  .about-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .ai-card { grid-template-columns: 1fr; gap: 1.5rem; }
  .pipeline { grid-template-columns: 1fr; gap: 2rem; }
  .case-meta { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: 1.25rem; }
}