/* Hallmark · macrostructure: Marquee Hero · genre: modern-minimal · theme: Cobalt
 * nav: N1b (canonical SaaS three-section) · footer: Ft2 (inline single line)
 * differs from source: fake terminal-window chrome removed, cursor-glow +
 * background grid removed, per-section eyebrows removed, hero de-crowded
 * (portrait + CTAs moved below the fold onto a graphite band)
 */

/* =========================================================
   Yusuf Sayı — Portfolio · Cobalt
   ========================================================= */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--color-paper);
  color: var(--color-ink-2);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  transition: background-color var(--dur-long) var(--ease-out),
              color var(--dur-long) var(--ease-out);
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; cursor: pointer; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  font-style: normal;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0;
  overflow-wrap: anywhere;
  min-width: 0;
}

p { margin: 0; }

:where(a, button, input, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-control);
}

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

.container {
  width: min(100% - (var(--page-gutter) * 2), var(--page-max));
  margin-inline: auto;
}

.section {
  position: relative;
  z-index: var(--z-base);
  padding-block: var(--space-3xl);
}

@media (max-width: 40rem) {
  .section { padding-block: var(--space-2xl); }
}

.section-head {
  max-width: 42rem;
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: var(--text-2xl);
}

.section-desc {
  margin-top: var(--space-sm);
  color: var(--color-muted);
  max-width: 58ch;
}

/* ---------- Reveal (one composed entrance, per section) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-long) var(--ease-out),
              transform var(--dur-long) var(--ease-out);
  transition-delay: var(--delay, 0ms);
}
.reveal.is-in { opacity: 1; transform: none; }

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

/* ---------- Navigation — N1b ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid transparent;
  background: transparent;
  transition: background-color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out),
              box-shadow var(--dur-short) var(--ease-out);
}

.nav.is-stuck {
  background: color-mix(in oklch, var(--color-paper) 82%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--color-rule);
  box-shadow: 0 8px 28px -20px oklch(24% 0.02 258 / 0.3);
}

.nav-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-md);
  min-height: 64px;
}

.nav-brand {
  justify-self: start;
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--color-ink);
  white-space: nowrap;
}

.nav-links {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-muted);
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--radius-control);
  transition: color var(--dur-short) var(--ease-out),
              background-color var(--dur-short) var(--ease-out);
}

.nav-link:hover { color: var(--color-ink); background: var(--color-paper-2); }
.nav-link.is-active { color: var(--color-accent); }

.nav-right {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-control);
  background: var(--color-paper);
  color: var(--color-muted);
  transition: color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out);
}

.theme-toggle:hover { color: var(--color-accent); border-color: var(--color-rule-2); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

.nav-toggle { display: none; }

@media (max-width: 60rem) {
  .nav-links {
    position: fixed;
    inset: 64px 0 auto;
    justify-self: stretch;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm);
    background: var(--color-paper);
    border-bottom: 1px solid var(--color-rule);
    box-shadow: var(--shadow-lift);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-short) var(--ease-out),
                transform var(--dur-short) var(--ease-out),
                visibility var(--dur-short);
  }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-link { padding: var(--space-sm); }
  .nav-toggle {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-rule);
    border-radius: var(--radius-control);
    background: var(--color-paper);
    color: var(--color-muted);
  }
  .nav-toggle svg { width: 18px; height: 18px; }
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 44px;
  padding: 0 var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-control);
  background: var(--color-paper);
  color: var(--color-ink);
  transition: border-color var(--dur-short) var(--ease-out),
              background-color var(--dur-short) var(--ease-out),
              color var(--dur-short) var(--ease-out),
              transform var(--dur-micro) var(--ease-out);
}

.btn svg { width: 16px; height: 16px; flex: none; }
.btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn:active { transform: translateY(1px); }
.btn:disabled,
.btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }

.btn-primary {
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
  color: var(--color-accent-ink);
}
.btn-primary:hover { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn-primary:focus-visible { outline-color: var(--color-ink); }
.btn[aria-busy="true"] { pointer-events: none; opacity: 0.75; }

.spinner {
  width: 15px; height: 15px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Hero — Marquee fold ---------- */
.hero {
  padding-block: clamp(3rem, 10vh, 5.5rem) clamp(2rem, 6vh, 3rem);
}

.prompt-line {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}
.prompt-line .sym { color: var(--color-accent); }

.hero-name {
  font-size: var(--text-display);
  letter-spacing: -0.03em;
  max-width: 16ch;
}

.caret {
  display: inline-block;
  width: 0.09em;
  height: 0.82em;
  margin-left: 0.08em;
  background: var(--color-accent);
  vertical-align: text-bottom;
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-roles {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--color-muted);
  min-height: 1.6em;
  margin-top: var(--space-md);
}
.hero-roles .arrow { color: var(--color-accent); }

.hero-scrolldown {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-2xl);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hero-scrolldown svg { width: 14px; height: 14px; animation: bob 2.2s var(--ease-in-out) infinite; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }

/* ---------- Graphite band (proof + primary CTA) ---------- */
.band-graphite {
  background: var(--color-graphite);
  color: var(--color-graphite-ink);
  padding-block: var(--space-3xl);
}

.band-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: start;
}

@media (min-width: 60rem) {
  .band-grid { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: var(--space-3xl); }
}

.band-portrait {
  position: relative;
  justify-self: start;
  width: min(100%, 300px);
}

.band-portrait-frame {
  aspect-ratio: 1;
  border: 1px solid var(--color-graphite-rule);
  border-radius: var(--radius-photo);
  overflow: hidden;
  background: var(--color-graphite-2);
}

.band-portrait-frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.03);
}

.band-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-md);
  padding: var(--space-2xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-graphite-muted);
  border: 1px solid var(--color-graphite-rule);
  border-radius: 999px;
}
.band-tag .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-accent);
}

.band-copy .kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.band-lines p {
  color: var(--color-graphite-muted);
  margin-bottom: var(--space-md);
  max-width: 60ch;
}
.band-lines p:last-child { margin-bottom: 0; }
.band-lines .cmd {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-graphite-ink);
  margin-bottom: var(--space-2xs);
}
.band-lines .cmd .sym { color: var(--color-accent); }

.band-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-block: var(--space-xl);
  padding-block: var(--space-lg);
  border-block: 1px solid var(--color-graphite-rule);
}

@media (max-width: 30rem) {
  .band-stats { grid-template-columns: 1fr; gap: var(--space-sm); }
}

.stat-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-graphite-ink);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: var(--text-sm);
  color: var(--color-graphite-muted);
}

.band-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.band-actions .btn { border-color: var(--color-graphite-rule); background: transparent; color: var(--color-graphite-ink); }
.band-actions .btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.band-actions .btn-primary { background: var(--color-accent-strong); border-color: var(--color-accent-strong); color: var(--color-accent-ink); }
.band-actions .btn-primary:hover { background: var(--color-accent); border-color: var(--color-accent); }
.band-actions .btn-primary:focus-visible { outline-color: var(--color-graphite-ink); }

/* ---------- Stack — bento ---------- */
.stack-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 40rem) {
  .stack-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 60rem) {
  .stack-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); grid-auto-rows: 1fr; }
  .stack-card--wide { grid-column: span 4; }
  .stack-card--narrow { grid-column: span 2; }
}

.stack-card {
  padding: var(--space-lg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  background: var(--color-paper);
  transition: border-color var(--dur-short) var(--ease-out),
              box-shadow var(--dur-short) var(--ease-out);
}
.stack-card:hover { border-color: var(--color-rule-2); box-shadow: var(--shadow-whisper); }

.stack-card h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-base);
  font-family: var(--font-body);
  font-weight: 600;
  margin-bottom: var(--space-md);
}
.stack-card h3 svg { width: 18px; height: 18px; color: var(--color-accent); flex: none; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.tag {
  padding: 3px var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-control);
}

/* ---------- Projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
@media (min-width: 40rem) {
  .project-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 60rem) {
  .project-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.project {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  background: var(--color-paper);
  transition: border-color var(--dur-short) var(--ease-out),
              box-shadow var(--dur-short) var(--ease-out),
              transform var(--dur-short) var(--ease-out);
}
.project:hover { border-color: var(--color-accent); box-shadow: var(--shadow-whisper); }
@media (hover: hover) and (pointer: fine) {
  .project:hover { transform: translateY(-2px); }
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.project-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-control);
  color: var(--color-accent);
  flex: none;
}
.project-icon svg { width: 18px; height: 18px; }

.project-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.project h3 {
  font-size: var(--text-md);
  font-family: var(--font-body);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.project p {
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-md);
  flex: 1;
}

.project .tags { margin-top: auto; }

/* ---------- Blog ---------- */
.post-list { display: grid; gap: var(--space-xs); }

.post {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  text-decoration: none;
  transition: border-color var(--dur-short) var(--ease-out),
              background-color var(--dur-short) var(--ease-out);
}
.post:hover { border-color: var(--color-rule-2); background: var(--color-paper-2); }

.post-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
  flex: none;
}
.post-title { font-size: var(--text-base); color: var(--color-ink-2); flex: 1; }
.post-arrow { color: var(--color-muted); flex: none; transition: color var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out); }
.post:hover .post-arrow { color: var(--color-accent); transform: translateX(3px); }
.post-arrow svg { width: 16px; height: 16px; }

.post-skeleton {
  height: 60px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  background: linear-gradient(90deg, var(--color-paper) 25%, var(--color-paper-2) 50%, var(--color-paper) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
}
@keyframes shimmer { to { background-position: -200% 0; } }

.post-empty {
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-muted);
  font-size: var(--text-sm);
  border: 1px dashed var(--color-rule-2);
  border-radius: var(--radius-card);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
}
@media (min-width: 60rem) {
  .contact-grid { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); }
}

.contact-status {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-muted);
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-rule);
}
.contact-status .sym { color: var(--color-accent); }

.contact-links {
  display: grid;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  color: var(--color-ink-2);
  text-decoration: none;
  transition: border-color var(--dur-short) var(--ease-out);
}
.contact-link:hover { border-color: var(--color-accent); }
.contact-link svg { width: 19px; height: 19px; color: var(--color-accent); flex: none; }
.contact-link .label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); display: block; }
.contact-link .value { font-size: var(--text-sm); }

.form { display: grid; gap: var(--space-md); }
.field { display: grid; gap: var(--space-xs); }

.field label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-2);
}
.field .req { color: var(--color-accent); }

.field input,
.field textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink);
  background: var(--color-paper);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-control);
  outline: 2px solid transparent;
  outline-offset: 1px;
  transition: background-color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out);
}
.field textarea { min-height: 140px; resize: vertical; line-height: 1.6; }
.field input::placeholder,
.field textarea::placeholder { color: var(--color-muted); }

@media (hover: hover) and (pointer: fine) {
  .field input:hover, .field textarea:hover { background: var(--color-paper-2); }
}
.field input:focus, .field textarea:focus {
  outline-color: var(--color-focus);
  border-color: var(--color-ink-2);
}
.field input:disabled, .field textarea:disabled {
  opacity: 0.55; cursor: not-allowed;
}

.field .help {
  font-size: var(--text-xs);
  color: var(--color-muted);
  min-height: 1lh;
}

.field.has-error input,
.field.has-error textarea { border-color: var(--color-error); }

.field-error {
  display: none;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-error);
}
.field.has-error .field-error { display: flex; }
.field-error svg { width: 14px; height: 14px; flex: none; }

.hp {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}

.form-foot { display: flex; align-items: center; gap: var(--space-md); flex-wrap: wrap; }

.form-status {
  display: none;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  font-size: var(--text-sm);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-control);
  background: var(--color-paper-2);
}
.form-status.is-visible { display: flex; }
.form-status.is-ok { border-color: var(--color-success); color: var(--color-success); }
.form-status.is-err { border-color: var(--color-error); color: var(--color-error); }
.form-status svg { width: 17px; height: 17px; flex: none; margin-top: 2px; }

/* ---------- Footer — Ft2 ---------- */
.footer {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--color-rule);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.footer a { color: var(--color-muted); text-decoration: none; }
.footer a:hover { color: var(--color-accent); }

.socials { display: flex; gap: var(--space-xs); }

.social {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-control);
  color: var(--color-muted);
  transition: color var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out);
}
.social:hover { color: var(--color-accent); border-color: var(--color-accent); }
.social svg { width: 17px; height: 17px; }

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -100px;
  z-index: var(--z-modal);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent-strong);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-control);
  transition: top var(--dur-short) var(--ease-out);
}
.skip-link:focus { top: var(--space-md); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}