/* sudembulut.com
   Palette logic: grey is noise, blue is the filtered signal.
   Accent is reserved for signal and interaction — nothing decorative. */

:root {
  --paper:    #0c1119;
  --panel:    #141c27;
  --ink:      #e4e9ef;
  --ink-soft: #97a5b8;
  --rule:     #26313f;
  --noise:    #55647a;
  --signal:   #6f9bff;

  --serif: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 36rem;
  --gutter: clamp(1rem, 5vw, 3rem);
  --header: 3.5rem;

  color-scheme: dark;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header) + 1rem);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 400;
  overflow-x: hidden;
}

::selection { background: var(--signal); color: var(--paper); }

/* ---------- shell ---------- */

.wrap {
  width: 100%;
  max-width: 62rem;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap {
  display: flex;
  gap: 0.5rem 1.5rem;
  align-items: center;
  min-height: var(--header);
}

.site-header .brand { margin-right: auto; }

.brand {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover { color: var(--signal); }

.lang-toggle {
  display: flex;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 2px;
}

.lang-toggle button {
  font: inherit;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  background: none;
  border: 0;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--signal);
  color: var(--paper);
}

.nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-block: 0.15rem;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

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

.nav a[aria-current] {
  color: var(--ink);
  border-bottom-color: var(--signal);
}

main { display: block; }

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  padding-block: 1.5rem;
}

.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--signal); }

/* ---------- type ---------- */

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0;
}

h1 { font-size: clamp(2.5rem, 7vw, 4.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1.1em; max-width: var(--measure); }

a { color: var(--signal); text-underline-offset: 0.18em; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.1875rem;
  line-height: 1.55;
  color: var(--ink);
}

h1 + .lead { margin-top: 1.5rem; }

.muted { color: var(--ink-soft); }

/* ---------- blocks ---------- */

.hero { padding-block: clamp(3rem, 9vw, 6rem) 2rem; }

.section { padding-block: 4.5rem 1rem; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  padding-bottom: 0.6rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
}

.section-head span { color: var(--signal); }
.section-head b { font-weight: inherit; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.button {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.875rem;
  color: var(--signal);
  text-decoration: none;
  border: 1px solid var(--signal);
  border-radius: 3px;
  padding: 0.7rem 1.2rem;
  transition: background 0.2s;
}

.button:hover { background: color-mix(in srgb, var(--signal) 12%, transparent); }

/* ---------- intro + portrait ---------- */

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem 3rem;
  align-items: center;
  min-height: calc(100svh - var(--header));
  padding-block: 3rem;
}

.portrait {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.portrait canvas {
  display: block;
  width: 500px;
  height: 500px;
  cursor: crosshair;
  touch-action: pan-y;
}

.portrait noscript img {
  display: block;
  width: 270px;
  height: auto;
  filter: grayscale(1) sepia(1) hue-rotate(180deg) saturate(2);
}

/* The portrait sits centred in a square canvas with ~110px of empty space on its
   left. Tuck that space under the text column so the headline keeps one line. */
@media (min-width: 801px) {
  .portrait canvas { margin-left: -90px; }
  .intro-text { position: relative; z-index: 1; }
}

@media (max-width: 768px) {
  .portrait canvas { width: 380px; height: 380px; }
}

@media (max-width: 800px) {
  .intro {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-block: 2rem 1rem;
  }
  .portrait { order: -1; }
}

@media (max-width: 480px) {
  .portrait canvas { width: min(320px, 100vw - 2rem); height: min(320px, 100vw - 2rem); }
}

/* ---------- tabs ---------- */

.tabs.is-enhanced {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.tab-list { display: none; }

.is-enhanced .tab-list {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--rule);
}

.tab {
  font: inherit;
  font-family: var(--mono);
  font-size: 0.8125rem;
  text-align: left;
  color: var(--ink-soft);
  background: none;
  border: 0;
  border-left: 2px solid transparent;
  margin-left: -2px;
  padding: 0.7rem 1rem;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.tab:hover { color: var(--ink); background: var(--panel); }

.tab[aria-selected="true"] {
  color: var(--signal);
  border-left-color: var(--signal);
  background: var(--panel);
}

.tab-panel { min-height: 16rem; }
.tabs:not(.is-enhanced) .tab-panel { min-height: 0; margin-bottom: 2.5rem; }

.tab-panel h3 { margin-bottom: 0.3rem; }

.tab-panel .at { color: var(--signal); }

.when {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  margin-bottom: 1.1rem;
}

.tab-panel ul {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: var(--measure);
}

.tab-panel li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.6rem;
}

.tab-panel li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--signal);
}

.tab-panel:not([hidden]) { animation: panel-in 0.35s ease-out; }

@keyframes panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

@media (max-width: 600px) {
  .tabs.is-enhanced { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .is-enhanced .tab-list {
    flex-direction: row;
    overflow-x: auto;
    border-left: 0;
    border-bottom: 2px solid var(--rule);
    scrollbar-width: none;
  }
  .tab {
    border-left: 0;
    border-bottom: 2px solid transparent;
    margin: 0 0 -2px;
    text-align: center;
  }
  .tab[aria-selected="true"] { border-bottom-color: var(--signal); }
}

/* ---------- projects ---------- */

.card {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  margin-bottom: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover { border-color: var(--noise); transform: translateY(-2px); }

.card-meta {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 0.75rem;
}

.card h2, .card h3 { margin-bottom: 1rem; font-size: clamp(1.25rem, 3vw, 1.5rem); }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.tags li {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0.15rem 0.5rem;
}

.card-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8125rem;
  margin-top: 1.5rem;
}

/* ---------- let's meet + booking ---------- */

.button-solid {
  background: var(--signal);
  color: var(--paper);
  border-color: var(--signal);
  font-weight: 500;
}

.button-solid:hover { background: #8fb1ff; }
.button-solid:disabled { opacity: 0.4; cursor: not-allowed; background: var(--signal); }

.bk-toggle { display: inline-flex; align-items: center; gap: 0.6rem; margin-top: 1rem; cursor: pointer; }
.bk-toggle [aria-hidden] { transition: transform 0.25s; }
.bk-toggle[aria-expanded="true"] [aria-hidden] { transform: rotate(90deg); }

.bk-share {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-top: 1rem;
}

.booking[data-open] .bk-toggle,
.booking[data-open] .bk-share { display: none; }

.bk-panel {
  margin-top: 2rem;
  animation: panel-in 0.35s ease-out;
}

.bk-channel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9375rem;
  color: var(--ink-soft);
  margin-bottom: 1.5rem;
}

.bk-channel span { margin-right: 0.4rem; }

.bk-channel button,
.bk-time {
  font: inherit;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.bk-channel button:hover,
.bk-time:hover { border-color: var(--signal); }

.bk-channel button[aria-pressed="true"],
.bk-time[aria-pressed="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--paper);
}

.bk-video {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.booking[data-channel="email"] .bk-video,
.booking[data-channel="video"] .bk-mail { display: none; }

.bk-cal,
.bk-side {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.25rem;
}

.bk-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.bk-month { font-weight: 500; text-transform: capitalize; }

.bk-nav {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: 1px solid var(--rule);
  background: none;
  color: var(--ink);
  cursor: pointer;
}

.bk-nav:hover:not(:disabled) { border-color: var(--signal); }
.bk-nav:disabled { opacity: 0.3; cursor: default; }

.bk-dow,
.bk-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.25rem;
  text-align: center;
}

.bk-dow {
  font-family: var(--mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}

.bk-day {
  aspect-ratio: 1;
  font: inherit;
  font-size: 0.9375rem;
  color: var(--ink);
  background: color-mix(in srgb, var(--signal) 12%, transparent);
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.bk-day:hover:not(:disabled) { border-color: var(--signal); }

.bk-day:disabled {
  background: none;
  color: var(--noise);
  cursor: default;
}

.bk-day[aria-pressed="true"] {
  background: var(--signal);
  color: var(--paper);
  font-weight: 500;
}

.bk-tz {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin: 1rem 0 0;
}

.bk-times {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-height: 11rem;
  overflow-y: auto;
  margin-bottom: 1.25rem;
}

.bk-hint { color: var(--ink-soft); font-size: 0.9375rem; margin: 0; }

.bk-summary {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  border: 1px dashed var(--rule);
  border-radius: 6px;
  padding: 0.7rem 0.9rem;
}

.bk-summary.is-set {
  color: var(--signal);
  border-style: solid;
  border-color: var(--signal);
}

.bk-form label {
  display: block;
  font-size: 0.875rem;
  color: var(--ink-soft);
  margin-bottom: 0.9rem;
}

.bk-form label em { font-style: normal; opacity: 0.7; }

.bk-form input,
.bk-form textarea {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  font: inherit;
  font-size: 0.9375rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
}

.bk-form input:focus,
.bk-form textarea:focus { outline: none; border-color: var(--signal); }

.bk-form textarea { resize: vertical; min-height: 4.5rem; }

.bk-form .button { width: 100%; cursor: pointer; }

.bk-mail {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.5rem;
  max-width: 36rem;
}

.bk-status:empty { display: none; }

.bk-status {
  margin-top: 1.25rem;
  padding: 0.9rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--rule);
  max-width: none;
}

.bk-status[data-kind="success"] { border-color: var(--signal); color: var(--ink); }
.bk-status[data-kind="error"] { border-color: #c96a6a; }

.booking.is-booked .bk-video,
.booking.is-booked .bk-channel { display: none; }

@media (max-width: 800px) {
  .bk-video { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- reveal on scroll (only when JS has opted in) ---------- */

.can-reveal .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.can-reveal .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- cv ---------- */

.entry {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 0 2rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--rule);
}

.entry:first-of-type { border-top: 0; padding-top: 0; }

.entry-when {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
  padding-top: 0.3rem;
}

.entry h3 { margin-bottom: 0.15rem; }

.entry-org {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--signal);
  margin: 0 0 0.75rem;
}

.entry ul {
  margin: 0;
  padding-left: 1.1rem;
  max-width: var(--measure);
}

.entry li { margin-bottom: 0.35rem; }

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

.plain {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: var(--measure);
}

.plain li {
  padding-block: 0.5rem;
  border-top: 1px solid var(--rule);
}

.plain li:first-child { border-top: 0; }

.plain .when {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

@media (max-width: 34rem) {
  .entry { grid-template-columns: 1fr; gap: 0.5rem; }
  .entry-when { padding-top: 0; }
}

/* ---------- narrow header ---------- */

@media (max-width: 720px) {
  .site-header .wrap { flex-wrap: wrap; padding-block: 0.6rem; row-gap: 0.4rem; }
  /* wrap rather than scroll: a hidden-overflow row buried the last links
     (CV, and more with the longer Turkish labels) off-screen */
  .nav {
    order: 3;
    width: 100%;
    flex-wrap: wrap;
    gap: 0.1rem 0.7rem;
    font-size: 0.75rem;
    letter-spacing: 0;
  }
  /* taller hit area on touch without changing how the row looks */
  .nav a { white-space: nowrap; padding-block: 0.55rem; margin-block: -0.4rem; }
  html { scroll-padding-top: 7.75rem; }
}

/* ---------- 404 ---------- */

.notfound {
  padding-block: clamp(4rem, 14vw, 9rem);
}

/* ---------- accessibility floor ---------- */

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- print (CV) ---------- */

@media print {
  :root { --paper: #fff; --ink: #000; --ink-soft: #444; --rule: #bbb; --signal: #000; color-scheme: light; }
  .site-header, .site-footer { display: none; }
  body { font-size: 10.5pt; }
  .section { padding-block: 0.75rem; }
  .entry { break-inside: avoid; }
}