/* =========================================================
   haandev — tek stil kaynağı
   Anasayfa da yazılar da buradan besleniyor.
   Yazıya özel olan şeyler (o yazıda bir kez kullanılan bir
   demo, bir animasyon) yazının kendi <style> bloğunda kalır;
   ama renk / tipografi / bileşen dili burada tanımlıdır.
   ========================================================= */

/* ---------- 1. token'lar ---------- */

:root {
  --bg: #fbfbfa;
  --fg: #1c1c1a;
  --muted: #55534e;
  --accent: #b4532a;
  --rule: #e2e1dd;
  --code-bg: #f2f1ed;

  /* iki tematik renk: cebir (yeşil) ve geometri (mavi) */
  --alg: #14724b;
  --geo: #2733c9;
  --alg-faint: #ebf4ef;
  --geo-faint: #eef0fc;
  --alg-line: #cfe5da;
  --geo-line: #d8dcf6;

  --danger: #b3261e;
  --danger-faint: #fbedec;

  --font-body: ui-serif, "Iowan Old Style", "Source Serif 4", Georgia, serif;
  --font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 40rem;
  --measure-wide: 50rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --fg: #e6e5e1;
    --muted: #9a9a94;
    --accent: #e08b5f;
    --rule: #2c2c32;
    --code-bg: #22222a;

    --alg: #4cb98c;
    --geo: #8b95f5;
    --alg-faint: rgba(76, 185, 140, 0.1);
    --geo-faint: rgba(139, 149, 245, 0.1);
    --alg-line: rgba(76, 185, 140, 0.28);
    --geo-line: rgba(139, 149, 245, 0.28);

    --danger: #f08a80;
    --danger-faint: rgba(240, 138, 128, 0.12);
  }
}

/* ---------- 2. temel ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 3rem 0 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 1.0625rem/1.72 var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.col {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1.375rem;
}

.wide {
  max-width: var(--measure-wide);
  margin-inline: auto;
  padding-inline: 1.375rem;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

p {
  margin: 0 0 1.25rem;
}

strong {
  font-weight: 600;
}

h1,
h2,
h3 {
  font-family: var(--font-ui);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ---------- 3. anasayfa ---------- */

.site-header {
  margin-bottom: 3.5rem;
}

.site-title {
  margin: 0;
  font-size: 1.75rem;
}

.site-description {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.site-nav {
  margin-top: 1rem;
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.875rem;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-item + .post-item {
  border-top: 1px solid var(--rule);
}

.post-link {
  display: block;
  padding: 1.5rem 0;
  color: inherit;
  text-decoration: none;
}

.post-link:hover h2 {
  color: var(--accent);
}

.post-link time {
  display: block;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.post-link h2 {
  margin: 0.25rem 0 0;
  padding: 0;
  border: 0;
  font-size: 1.3125rem;
  line-height: 1.35;
  transition: color 0.15s;
}

.post-link p {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 0;
  padding: 0;
  font-family: var(--font-ui);
  font-size: 0.75rem;
}

.tags li {
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--muted);
}

.empty {
  color: var(--muted);
  padding: 1.5rem 0;
}

/* ---------- 4. yazı başlığı ve alt bilgi ---------- */

.back {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  text-decoration: none;
}

.post-header {
  margin-bottom: 3rem;
}

.post-header h1 {
  margin: 1.5rem 0 0.5rem;
  font-size: clamp(1.875rem, 5vw, 2.5rem);
  line-height: 1.14;
}

.post-header time {
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
}

.dek {
  margin: 1rem 0 0;
  max-width: 34em;
  font-size: 1.1875rem;
  font-style: italic;
  line-height: 1.55;
  color: var(--muted);
}

.dek .g {
  color: var(--geo);
  font-style: normal;
}

.dek .a {
  color: var(--alg);
  font-style: normal;
}

.site-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
}

/* ---------- 5. yazı gövdesi ---------- */

h2 {
  margin: 3.25rem 0 1rem;
  font-size: clamp(1.375rem, 3.4vw, 1.625rem);
  line-height: 1.22;
}

h3 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.1875rem;
}

/* sahne rengi başlığın kenarına düşer */
.s-alg h2 {
  border-left: 4px solid var(--alg);
  padding-left: 0.875rem;
}

.s-geo h2 {
  border-left: 4px solid var(--geo);
  padding-left: 0.875rem;
}

.s-mix h2 {
  border-left: 4px solid var(--fg);
  padding-left: 0.875rem;
}

.smallcap {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

blockquote {
  margin: 2rem 0;
  padding: 0.375rem 0 0.375rem 1.375rem;
  border-left: 4px solid var(--fg);
  font-size: 1.25rem;
  line-height: 1.5;
  font-style: italic;
}

.s-alg blockquote {
  border-color: var(--alg);
}

.s-geo blockquote {
  border-color: var(--geo);
}

code,
kbd,
pre {
  font-family: var(--font-mono);
}

:not(pre) > code {
  padding: 0.15em 0.35em;
  font-size: 0.86em;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

pre {
  margin: 1.625rem 0;
  padding: 1.125rem 1.25rem;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

hr,
hr.qz {
  border: 0;
  height: 1px;
  background: var(--rule);
  margin: 4rem auto;
  max-width: var(--measure);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.625rem 0;
  font-size: 1rem;
}

th {
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: left;
  color: var(--muted);
  border-bottom: 2px solid var(--fg);
  padding: 0.5rem 0.75rem;
}

td {
  border-bottom: 1px solid var(--rule);
  padding: 0.625rem 0.75rem;
}

td.mono {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.foot {
  margin: 4rem 0 0;
  padding-top: 1.625rem;
  border-top: 1px solid var(--rule);
  font-size: 0.96875rem;
  font-style: italic;
  color: var(--muted);
}

/* ---------- 6. görseller ---------- */

figure {
  margin: 2.375rem 0;
}

img,
video,
svg,
iframe {
  max-width: 100%;
  height: auto;
}

figure svg {
  width: 100%;
  display: block;
}

/* Şekiller kağıt üzerinde duruyor: SVG'lerin içindeki renkler sabit
   olduğu için bu tabaka koyu temada da açık kalır. */
.fig-frame {
  padding: 1.375rem;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 6px;
}

figcaption {
  margin-top: 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  text-align: center;
  color: var(--muted);
}

figcaption b {
  color: var(--fg);
}

/* ---------- 7. bölüm bantları ---------- */

.scene {
  margin: 5rem 0 2.5rem;
}

.scene .strip {
  border-top: 3px solid;
  padding-top: 1rem;
}

.scene.alg .strip {
  border-color: var(--alg);
}

.scene.geo .strip {
  border-color: var(--geo);
}

.scene .eyebrow,
.merge .eyebrow {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.scene.alg .eyebrow {
  color: var(--alg);
}

.scene.geo .eyebrow {
  color: var(--geo);
}

.scene .name,
.merge .name {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(1.75rem, 4.6vw, 2.375rem);
  letter-spacing: -0.02em;
  margin-top: 0.25rem;
}

.scene.alg .name {
  color: var(--alg);
}

.scene.geo .name {
  color: var(--geo);
}

.merge {
  margin: 5.5rem 0 2.75rem;
  text-align: center;
}

.merge .strip {
  border-top: 3px solid var(--fg);
  padding-top: 1.375rem;
}

.merge .eyebrow {
  color: var(--muted);
}

.merge .name .a {
  color: var(--alg);
}

.merge .name .g {
  color: var(--geo);
}

/* ---------- 8. vurgu bileşenleri ---------- */

/* numaralı not kutusu */
.keep {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.875rem 0;
  padding: 1rem 1.25rem;
  background: var(--geo-faint);
  border: 1px solid var(--geo-line);
  border-radius: 8px;
}

.keep .num {
  min-width: 3.5rem;
  text-align: center;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 2.75rem;
  line-height: 1;
  color: var(--geo);
}

.keep p {
  margin: 0;
  font-size: 1.0625rem;
}

/* yan yana iki renkli not */
.reveal-note {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
  margin: 1.75rem 0;
}

.reveal-note .cell {
  padding: 1rem 1.125rem;
  border-radius: 8px;
  font-size: 1rem;
}

.reveal-note .cell.g {
  background: var(--geo-faint);
  border: 1px solid var(--geo-line);
}

.reveal-note .cell.a {
  background: var(--alg-faint);
  border: 1px solid var(--alg-line);
}

.reveal-note .cell .t {
  margin-bottom: 0.375rem;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.reveal-note .cell.g .t {
  color: var(--geo);
}

.reveal-note .cell.a .t {
  color: var(--alg);
}

.reveal-note .cell p {
  margin: 0;
}

@media (max-width: 600px) {
  .reveal-note {
    grid-template-columns: 1fr;
  }
}

/* sayı kutucukları */
.chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
}

.chip {
  min-width: 3.25rem;
  padding: 0.625rem 0;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--bg);
  color: var(--fg);
  border: 2px solid var(--fg);
  border-radius: 6px;
}

.chip.ctrl {
  background: var(--alg-faint);
  border-color: var(--alg);
  color: var(--alg);
}

.chip.bad {
  background: var(--danger-faint);
  border-color: var(--danger);
  color: var(--danger);
}

.chip.q {
  border-style: dashed;
  color: var(--muted);
}

.chips .sep {
  padding: 0 0.125rem;
  font-size: 1.375rem;
  color: var(--muted);
}

.chips .lbl {
  width: 100%;
  margin-top: -0.125rem;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* kapasite çubukları */
.cap {
  margin: 1.625rem 0;
  font-family: var(--font-ui);
}

.cap .row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.625rem 0;
}

.cap .lv {
  width: 1.625rem;
  font-weight: 700;
  font-size: 1rem;
}

.cap .bar {
  flex: 1;
  display: flex;
  height: 1.625rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}

.cap .data {
  background: var(--fg);
}

.cap .ec {
  background: var(--alg);
}

.cap .tag {
  width: 9.375rem;
  text-align: right;
  font-size: 0.84375rem;
  color: var(--muted);
}

.cap .legend {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.875rem;
  font-size: 0.84375rem;
  color: var(--muted);
}

.cap .legend i {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  margin-right: 0.375rem;
  border-radius: 3px;
  vertical-align: -1px;
}

/* iki renkli künye işareti */
.overprint {
  position: relative;
  width: 104px;
  height: 104px;
  margin-bottom: 1.75rem;
}

.overprint .sq {
  position: absolute;
  inset: 0;
  opacity: 0.82;
}

.overprint .sq.g1 {
  background: var(--alg);
  transform: rotate(-8deg);
}

.overprint .sq.g2 {
  background: var(--geo);
  transform: rotate(10deg) translate(14px, 6px);
  mix-blend-mode: multiply;
}

@media (prefers-color-scheme: dark) {
  .overprint .sq.g2 {
    mix-blend-mode: screen;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .overprint .sq.g1 {
    animation: tiltA 1.1s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }
  .overprint .sq.g2 {
    animation: tiltB 1.1s 0.12s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }
  @keyframes tiltA {
    from {
      transform: rotate(0deg);
      opacity: 0;
    }
    to {
      transform: rotate(-8deg);
      opacity: 0.82;
    }
  }
  @keyframes tiltB {
    from {
      transform: rotate(0deg) translate(0, 0);
      opacity: 0;
    }
    to {
      transform: rotate(10deg) translate(14px, 6px);
      opacity: 0.82;
    }
  }
}