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/* ─────────────────────────────────────────────────────────────────────────
   Dr. Arın Saydam — arin-saydam.com
   Concept: "Saydam" means transparent; her doctorate became
   "İletişimin Derin Mavisi". The page starts as clear, light water and
   deepens to blue as you read down. Copper (bakır) is the one warm signal,
   shared with the other Saydam sites.
   ───────────────────────────────────────────────────────────────────────── */

:root {
  --paper: #f4f2ed;
  --ink: #13202b;
  --ink-2: #46525d;
  --rule: rgba(19, 32, 43, 0.14);

  --mist: #e6ecef;
  --shallow: #d3e0e7;
  --sea: #b9cdd9;
  --tide: #2b5371;
  --deep: #12304a;
  --deeper: #0c2439;
  --abyss: #06131f;

  --foam: #edf3f6;
  --foam-2: #a9bfcd;
  --foam-rule: rgba(237, 243, 246, 0.16);

  --copper: #8c552e;       /* text on light */
  --copper-bright: #b97a4b;/* marks on light */
  --copper-light: #dba577; /* text + marks on dark */

  --serif: "Literata", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --gutter: clamp(16px, 4.2vw, 56px);
  --maxw: 1280px;

  --step--2: clamp(0.72rem, 0.7rem + 0.08vw, 0.78rem);
  --step--1: clamp(0.82rem, 0.79rem + 0.12vw, 0.9rem);
  --step-0: clamp(1.0625rem, 1rem + 0.28vw, 1.1875rem);
  --step-1: clamp(1.22rem, 1.08rem + 0.6vw, 1.55rem);
  --step-2: clamp(1.5rem, 1.2rem + 1.35vw, 2.35rem);
  --step-3: clamp(1.95rem, 1.4rem + 2.5vw, 3.6rem);
  --step-4: clamp(2.4rem, 1.5rem + 4vw, 5rem);
  --step-name: clamp(3.3rem, 0.9rem + 10.4vw, 11rem);

  color-scheme: light;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--abyss);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
p, h1, h2, h3, h4, figure, blockquote, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
button { font: inherit; color: inherit; }

::selection { background: var(--copper-light); color: var(--abyss); }

:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 3px;
  border-radius: 2px;
}
[data-tone="dark"] :focus-visible { outline-color: var(--copper-light); }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip {
  position: fixed; left: 12px; top: 12px; z-index: 100;
  padding: 10px 14px;
  background: var(--ink); color: var(--paper);
  font-size: var(--step--1); text-decoration: none;
  border-radius: 4px;
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease-out);
}
.skip:focus { transform: none; }

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

/* ── Shared type ─────────────────────────────────────────────────────── */

.label {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--sans);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.label .num {
  font-variant-numeric: tabular-nums;
  color: var(--copper);
}
.label::after {
  content: "";
  flex: 0 0 40px;
  height: 1px;
  background: currentColor;
  opacity: 0.45;
}
[data-tone="dark"] .label { color: var(--foam-2); }
[data-tone="dark"] .label .num { color: var(--copper-light); }

.display {
  font-family: var(--serif);
  font-weight: 340;
  font-size: var(--step-3);
  line-height: 1.12;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.display em { font-style: italic; font-weight: 320; }

.prose p {
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 62ch;
  text-wrap: pretty;
  hyphens: manual;
}
.prose p + p { margin-top: 1.1em; }
.prose strong { font-weight: 560; color: var(--ink); }

/* ── Header ──────────────────────────────────────────────────────────── */

.top {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  color: var(--ink);
  transition: color 0.45s var(--ease-out), background-color 0.45s var(--ease-out),
    border-color 0.45s var(--ease-out), transform 0.5s var(--ease-out);
  border-bottom: 1px solid transparent;
}
.top::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: rgba(244, 242, 237, 0.72);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  opacity: 0;
  transition: opacity 0.45s var(--ease-out), background-color 0.45s var(--ease-out);
}
.is-scrolled .top::before { opacity: 1; }
.is-scrolled .top { border-bottom-color: var(--rule); }
.tone-dark .top { color: var(--foam); }
.tone-dark .top::before { background: rgba(8, 26, 42, 0.62); }
.tone-dark.is-scrolled .top { border-bottom-color: var(--foam-rule); }

.top__bar {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}

.mark {
  display: inline-flex; align-items: baseline; gap: 0.32em;
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 450;
  letter-spacing: -0.005em;
  text-decoration: none;
  white-space: nowrap;
}
.mark__dr {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.7;
}

.nav { display: none; }
.nav ul { display: flex; gap: clamp(18px, 2.4vw, 34px); }
.nav a {
  position: relative;
  font-size: var(--step--1);
  font-weight: 450;
  text-decoration: none;
  opacity: 0.78;
  transition: opacity 0.25s;
  padding-block: 10px;
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 1px;
  background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform 0.4s var(--ease-out);
}
.nav a:hover, .nav a[aria-current="true"] { opacity: 1; }
.nav a:hover::after, .nav a[aria-current="true"]::after { transform: scaleX(1); transform-origin: left; }

.menu-btn {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 44px; padding: 0 2px;
  background: none; border: 0; cursor: pointer;
  font-size: var(--step--1); font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
}
.menu-btn__icon { position: relative; width: 22px; height: 10px; }
.menu-btn__icon::before, .menu-btn__icon::after {
  content: ""; position: absolute; left: 0; right: 0; height: 1.5px;
  background: currentColor; border-radius: 1px;
  transition: transform 0.4s var(--ease-out), top 0.4s var(--ease-out);
}
.menu-btn__icon::before { top: 0; }
.menu-btn__icon::after { top: 8.5px; }
[aria-expanded="true"] .menu-btn__icon::before { top: 4.25px; transform: rotate(45deg); }
[aria-expanded="true"] .menu-btn__icon::after { top: 4.25px; transform: rotate(-45deg); }

@media (min-width: 900px) {
  .nav { display: block; }
  .menu-btn { display: none; }
}

/* Mobile sheet */
.sheet {
  position: fixed; inset: 0; z-index: 45;
  background: linear-gradient(180deg, var(--deep), var(--abyss));
  color: var(--foam);
  padding: 96px var(--gutter) 40px;
  display: flex; flex-direction: column; justify-content: space-between;
  clip-path: inset(0 0 100% 0);
  visibility: hidden;
  transition: clip-path 0.6s var(--ease-out), visibility 0s 0.6s;
}
.menu-open .sheet {
  clip-path: inset(0 0 0 0);
  visibility: visible;
  transition: clip-path 0.6s var(--ease-out), visibility 0s;
}
.menu-open .top { color: var(--foam); }
.menu-open .top::before { opacity: 0; }
.menu-open .top { border-bottom-color: transparent; }
.sheet ol { counter-reset: s; }
.sheet li { border-bottom: 1px solid var(--foam-rule); }
.sheet a {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 14px 0;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 8vw, 2.6rem);
  font-weight: 340;
  text-decoration: none;
  transform: translateY(18px); opacity: 0;
  transition: transform 0.6s var(--ease-out), opacity 0.6s var(--ease-out);
}
.sheet a::after {
  counter-increment: s;
  content: "0" counter(s);
  font-family: var(--sans); font-size: 0.8rem; letter-spacing: 0.12em;
  color: var(--copper-light);
}
.menu-open .sheet a { transform: none; opacity: 1; }
.menu-open .sheet li:nth-child(1) a { transition-delay: 0.12s; }
.menu-open .sheet li:nth-child(2) a { transition-delay: 0.16s; }
.menu-open .sheet li:nth-child(3) a { transition-delay: 0.2s; }
.menu-open .sheet li:nth-child(4) a { transition-delay: 0.24s; }
.menu-open .sheet li:nth-child(5) a { transition-delay: 0.28s; }
.sheet__foot { font-size: var(--step--1); color: var(--foam-2); }
@media (min-width: 900px) { .sheet { display: none; } }

/* ── Depth rail (wide screens) ───────────────────────────────────────── */

.rail {
  position: fixed; z-index: 40;
  right: clamp(14px, 1.8vw, 28px);
  top: 50%;
  transform: translateY(-50%);
  display: none;
  color: var(--ink);
  transition: color 0.45s var(--ease-out), opacity 0.4s;
}
.rail.is-dark { color: var(--foam); }
@media (min-width: 1180px) { .rail { display: block; } }
.rail__track { position: relative; }
.rail ol { display: grid; gap: 18px; padding-right: 18px; }
.rail__track::before {
  content: ""; position: absolute; right: 0; top: 4px; bottom: 4px; width: 1px;
  background: currentColor; opacity: 0.2;
}
.rail__marker {
  position: absolute; right: -3px; top: 0;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--copper-bright);
  box-shadow: 0 0 0 4px rgba(185, 122, 75, 0.18);
  transform: translateY(calc(var(--rail-p, 0) * (var(--rail-h, 0) * 1px)));
  will-change: transform;
}
.rail.is-dark .rail__marker { background: var(--copper-light); }
.rail a {
  display: block;
  font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  text-align: right; text-decoration: none;
  opacity: 0.38;
  transition: opacity 0.3s;
}
.rail a:hover, .rail a[aria-current="true"] { opacity: 1; }

/* ── Sections: the descent ───────────────────────────────────────────── */

section { position: relative; }

.s-hero    { background: linear-gradient(180deg, var(--paper) 0%, #f0f1ee 100%); }
.s-about   { background: linear-gradient(180deg, #f0f1ee 0%, var(--mist) 100%); }
.s-path    { background: linear-gradient(180deg, var(--mist) 0%, var(--shallow) 100%); }
.s-change  {
  background: linear-gradient(180deg,
    var(--shallow) 0%, var(--sea) 9%, #7f9db2 18%, var(--tide) 29%, #183c59 48%, var(--deep) 100%);
}
.s-books   { background: linear-gradient(180deg, var(--deep) 0%, var(--deeper) 100%); }
.s-writing { background: linear-gradient(180deg, var(--deeper) 0%, #091c2e 100%); }
.s-contact { background: linear-gradient(180deg, #091c2e 0%, var(--abyss) 100%); }

[data-tone="dark"] { color: var(--foam); }

.section-pad { padding-block: clamp(88px, 13vw, 180px); }

/* ── Hero ────────────────────────────────────────────────────────────── */

.s-hero {
  min-height: 100svh;
  display: flex; flex-direction: column;
  overflow: hidden;
}
.caustics {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 2.4s var(--ease-out);
}
.caustics.is-live { opacity: 1; }
.hero__glow {
  position: absolute; inset: -20% -10% auto auto;
  width: 80vw; height: 90vh;
  background: radial-gradient(closest-side, rgba(185, 205, 217, 0.55), rgba(185, 205, 217, 0) 70%);
  pointer-events: none;
}

.hero {
  position: relative;
  flex: 1;
  display: grid;
  align-content: end;
  gap: clamp(28px, 4vw, 48px);
  padding-top: 120px;
  padding-bottom: clamp(36px, 6vw, 72px);
}
.hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
  align-items: end;
}
@media (min-width: 960px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr) minmax(280px, 0.42fr); }
  .hero__grid.no-portrait { grid-template-columns: 1fr; }
}

.hero__eyebrow {
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-wrap: balance;
}
.hero__eyebrow span + span::before { content: "·"; margin: 0 0.7em; color: var(--copper-bright); }

.name {
  margin-top: clamp(14px, 2vw, 22px);
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--step-name);
  line-height: 0.88;
  letter-spacing: -0.035em;
  color: var(--ink);
}
.name__line { display: block; overflow: hidden; padding-bottom: 0.06em; margin-bottom: -0.06em; }
.name__line + .name__line { margin-top: 0.02em; }
.name__line--2 { padding-left: 0.42em; font-style: italic; font-weight: 280; }
.name .ch { display: inline-block; will-change: transform; }

.hero__lede {
  max-width: 34ch;
  font-family: var(--serif);
  font-size: var(--step-1);
  font-weight: 360;
  line-height: 1.45;
  color: var(--ink-2);
  text-wrap: pretty;
}
.hero__lede strong { font-weight: 480; color: var(--ink); }

.hero__foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 18px 32px;
  padding-top: clamp(20px, 2.4vw, 28px);
  border-top: 1px solid var(--rule);
}
.hero__roles { display: flex; flex-wrap: wrap; gap: 8px 28px; font-size: var(--step--1); color: var(--ink-2); }
.hero__roles b { font-weight: 500; color: var(--ink); }

.cue {
  display: inline-flex; align-items: center; gap: 14px;
  font-size: var(--step--2); font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase;
  text-decoration: none; color: var(--ink-2);
}
.cue__line { position: relative; width: 1px; height: 42px; background: var(--rule); overflow: hidden; }
.cue__line::after {
  content: ""; position: absolute; left: 0; top: -40%; width: 1px; height: 40%;
  background: var(--copper-bright);
  animation: cue 2.4s var(--ease-in-out) infinite;
}
@keyframes cue { 0% { top: -40%; } 70%, 100% { top: 100%; } }

/* portrait */
.portrait {
  position: relative;
  justify-self: end;
  width: min(100%, 420px);
  aspect-ratio: 4 / 5;
  border-radius: 999px 999px 6px 6px;
  overflow: hidden;
  background: var(--shallow);
  box-shadow: 0 40px 80px -40px rgba(18, 48, 74, 0.45);
  isolation: isolate;
}
.portrait img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: 50% 22%;
  filter: saturate(0.9) contrast(1.02);
}
.portrait::after {
  /* glass sheen: the "saydam" surface */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(115deg, rgba(255,255,255,0) 30%, rgba(255,255,255,0.28) 46%, rgba(255,255,255,0) 60%);
  mix-blend-mode: soft-light;
  transform: translateX(-100%);
  pointer-events: none;
}
.is-loaded .portrait::after { animation: sheen 2.6s 1.1s var(--ease-in-out) both; }
@keyframes sheen { to { transform: translateX(100%); } }
.portrait figcaption { position: absolute; }
@media (max-width: 959px) {
  .hero { padding-top: 92px; }
  .portrait { justify-self: end; width: min(48vw, 260px); order: -1; margin-bottom: -8px; }
}

/* ── About ───────────────────────────────────────────────────────────── */

.about__grid {
  display: grid;
  gap: clamp(40px, 6vw, 80px);
}
@media (min-width: 960px) {
  .about__grid { grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr); }
}
.about__lead { margin-top: 28px; max-width: 18ch; }
.head-display { margin-top: 28px; }
.about__lead .display { font-size: var(--step-3); }

.facts {
  margin-top: clamp(64px, 9vw, 120px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
}
@media (min-width: 900px) { .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.fact {
  padding: 26px 18px 26px 0;
  border-bottom: 1px solid var(--rule);
}
.fact:nth-child(odd) { padding-right: 18px; }
@media (min-width: 900px) {
  .fact { border-bottom: 0; }
  .fact + .fact { padding-left: 24px; border-left: 1px solid var(--rule); }
}
@media (max-width: 899px) {
  .fact:nth-child(even) { padding-left: 18px; border-left: 1px solid var(--rule); }
}
.fact__big {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3.4rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: lining-nums;
}
.fact__big i { font-style: italic; }
.fact__txt {
  display: block; margin-top: 12px;
  font-size: var(--step--1); line-height: 1.5;
  color: var(--ink-2);
}

.areas { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 10px; }
.areas li {
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: var(--step--1);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.35);
}

/* ── Path (timeline) ─────────────────────────────────────────────────── */

.path__head {
  display: grid; gap: 24px;
  margin-bottom: clamp(48px, 7vw, 96px);
}
@media (min-width: 960px) {
  .path__head { grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr); align-items: end; }
}
.path__intro { max-width: 46ch; color: var(--ink-2); font-family: var(--serif); }

.timeline { position: relative; --p: 0; }
.timeline__line {
  position: absolute; top: 6px; bottom: 6px;
  left: 7px; width: 1px;
  background: var(--rule);
}
.timeline__line::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--copper-bright), var(--tide));
  transform-origin: top;
  transform: scaleY(var(--p));
}
@media (min-width: 960px) {
  .timeline__line { left: calc(18% + 7px); }
}
.tl-item {
  position: relative;
  display: grid;
  gap: 6px 0;
  padding: 0 0 clamp(36px, 5vw, 56px) 40px;
}
@media (min-width: 960px) {
  .tl-item { grid-template-columns: 18% minmax(0, 1fr); padding-left: 0; }
  .tl-item__body { padding-left: 44px; }
}
.tl-item::before {
  content: ""; position: absolute; top: 0.62em; left: 3px;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--mist);
  border: 1px solid rgba(19, 32, 43, 0.35);
  transition: background-color 0.5s, border-color 0.5s, box-shadow 0.5s;
}
@media (min-width: 960px) { .tl-item::before { left: calc(18% + 3px); } }
.tl-item.is-lit::before {
  background: var(--copper-bright);
  border-color: var(--copper-bright);
  box-shadow: 0 0 0 5px rgba(185, 122, 75, 0.16);
}
.tl-item__year {
  font-family: var(--serif);
  font-size: var(--step-1);
  font-weight: 360;
  font-variant-numeric: lining-nums tabular-nums;
  color: var(--copper);
  line-height: 1.3;
}
.tl-item__title {
  font-family: var(--serif);
  font-size: var(--step-1);
  font-weight: 420;
  line-height: 1.3;
  color: var(--ink);
  text-wrap: balance;
}
.tl-item__text {
  margin-top: 8px;
  max-width: 58ch;
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--ink-2);
}

.boards {
  margin-top: clamp(32px, 5vw, 56px);
  display: grid; gap: 0;
  border-top: 1px solid var(--rule);
}
@media (min-width: 960px) {
  .boards { grid-template-columns: 18% repeat(3, minmax(0, 1fr)); }
}
.boards__label { padding: 22px 0 6px; }
.board { padding: 22px 0; border-bottom: 1px solid var(--rule); }
@media (min-width: 960px) {
  .board { padding: 22px 24px 22px 44px; border-bottom: 0; }
  .board + .board { border-left: 1px solid var(--rule); padding-left: 24px; }
}
.board__name { font-family: var(--serif); font-size: 1.06rem; font-weight: 450; color: var(--ink); }
.board__role { margin-top: 4px; font-size: var(--step--1); color: var(--ink-2); line-height: 1.5; }

/* ── Change (the epigraph, where the water turns) ────────────────────── */

.s-change {
  padding-top: clamp(200px, 38vh, 380px);
  padding-bottom: clamp(120px, 18vw, 220px);
}
.quote {
  max-width: 1040px;
  margin-inline: auto;
  text-align: center;
  color: var(--foam);
}
.quote__mark {
  display: block; margin: 0 auto 20px;
  width: 42px; height: 1px; background: var(--copper-light);
}
.quote p {
  max-width: 21ch;
  margin-inline: auto;
  font-family: var(--serif);
  font-size: var(--step-4);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.quote .w { transition: opacity 0.5s var(--ease-out), color 0.5s var(--ease-out); }
.js .quote .w { opacity: 0.16; }
.js .quote .w.on { opacity: 1; }
.quote footer {
  margin-top: 36px;
  font-size: var(--step--2); font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--foam-2);
}
.quote footer span { color: var(--copper-light); }

/* marine snow: fixed, fades in only in the deep sections */
.snow {
  position: fixed; inset: 0; z-index: 1;
  width: 100%; height: 100%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.8s linear;
}
main > section > .wrap, main > section > .hero { position: relative; z-index: 2; }

/* ── Books ───────────────────────────────────────────────────────────── */

.books__head {
  display: grid; gap: 24px;
  margin-bottom: clamp(48px, 7vw, 88px);
}
@media (min-width: 960px) {
  .books__head { grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr); align-items: end; }
}
.books__intro { max-width: 46ch; color: var(--foam-2); font-family: var(--serif); }

.shelf {
  display: grid;
  gap: clamp(48px, 6vw, 64px) clamp(24px, 3.5vw, 48px);
}
@media (min-width: 760px) { .shelf { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 759px) { .book__cover, .book__meta { max-width: 270px; } }

.book { perspective: 1200px; }
.book__cover {
  position: relative;
  aspect-ratio: 2 / 3;
  max-width: 340px;
  border-radius: 3px 6px 6px 3px;
  overflow: hidden;
  transform-style: preserve-3d;
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform 0.7s var(--ease-out), box-shadow 0.7s var(--ease-out);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.08) inset,
    0 30px 60px -28px rgba(0, 0, 0, 0.7),
    0 12px 24px -16px rgba(0, 0, 0, 0.6);
  display: flex; flex-direction: column; justify-content: space-between;
  padding: clamp(18px, 2.2vw, 26px);
  isolation: isolate;
}
.book__cover::before {
  /* spine crease */
  content: ""; position: absolute; left: 10px; top: 0; bottom: 0; width: 1px;
  background: rgba(0, 0, 0, 0.16);
  box-shadow: 1px 0 0 rgba(255, 255, 255, 0.12);
  z-index: 3;
}
.book:hover .book__cover, .book:focus-within .book__cover {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.08) inset,
    0 46px 80px -30px rgba(0, 0, 0, 0.75),
    0 16px 30px -18px rgba(0, 0, 0, 0.6);
}
.cover__top { position: relative; z-index: 2; padding-left: 8px; }
.cover__author {
  font-size: 0.66rem; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  opacity: 0.8;
}
.cover__title {
  margin-top: 12px;
  font-family: var(--serif);
  font-size: clamp(1.15rem, 0.95rem + 0.8vw, 1.5rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.cover__art { position: absolute; inset: 0; z-index: 1; }

/* Book 1: İletişimin Derin Mavisi */
.cover--blue { background: linear-gradient(180deg, #2c5a7a 0%, #123552 55%, #071a2b 100%); color: var(--foam); }
.cover--blue .waves { position: absolute; left: 0; right: 0; bottom: 0; height: 62%; }
.cover--blue .waves path { fill: none; stroke: rgba(219, 165, 119, 0.65); stroke-width: 1; vector-effect: non-scaling-stroke; }
.cover--blue .waves path:nth-child(n+2) { stroke: rgba(237, 243, 246, 0.24); }
.cover--blue .waves g { animation: drift 9s var(--ease-in-out) infinite alternate; animation-play-state: paused; }
.cover--blue .waves g:nth-child(2) { animation-duration: 12s; animation-direction: alternate-reverse; }
.book:hover .waves g, .book:focus-within .waves g, .book.is-in .waves g { animation-play-state: running; }
@keyframes drift { from { transform: translateX(0); } to { transform: translateX(-12%); } }

/* Book 2: Kurumsal İtibarınızdan Kaç Sıfır Atabilirsiniz? */
.cover--zero { background: #ece6db; color: var(--ink); }
.cover--zero .zeros {
  position: absolute; left: 18px; right: 12px; bottom: 16%;
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(2.4rem, 1.6rem + 3vw, 3.9rem);
  line-height: 1; letter-spacing: -0.04em;
  font-variant-numeric: lining-nums;
  white-space: nowrap;
  color: var(--ink);
}
.cover--zero .zeros .one { color: var(--copper); }
.cover--zero .zeros .z {
  display: inline-block;
  transition: transform 0.7s var(--ease-out), opacity 0.5s var(--ease-out);
}
.book:hover .zeros .z, .book:focus-within .zeros .z {
  transform: translateY(120%) rotate(8deg);
  opacity: 0;
}
.cover--zero .zeros .z:nth-child(2) { transition-delay: 0.00s; }
.cover--zero .zeros .z:nth-child(3) { transition-delay: 0.04s; }
.cover--zero .zeros .z:nth-child(4) { transition-delay: 0.08s; }
.cover--zero .zeros .z:nth-child(5) { transition-delay: 0.12s; }
.cover--zero .zeros .z:nth-child(6) { transition-delay: 0.16s; }
.cover--zero .zeros .z:nth-child(7) { transition-delay: 0.20s; }
.cover--zero .zeros .z:nth-child(8) { transition-delay: 0.24s; }
.cover--zero .zeros .z:nth-child(9) { transition-delay: 0.28s; }
.cover--zero .rule { position: absolute; left: 18px; right: 18px; bottom: 11%; height: 1px; background: rgba(19, 32, 43, 0.25); }

/* Book 3: Sektörün Penceresinden Halkla İlişkiler */
.cover--window { background: #1b2f3d; color: var(--foam); }
.cover--window .panes {
  position: absolute; left: 22%; right: 14%; bottom: 12%; top: 46%;
  display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 6px;
}
.cover--window .panes span {
  background: linear-gradient(160deg, rgba(219, 165, 119, 0.9), rgba(219, 165, 119, 0.28));
  transition: opacity 0.6s var(--ease-out), transform 0.8s var(--ease-out);
}
.cover--window .panes span:nth-child(2) { opacity: 0.55; }
.cover--window .panes span:nth-child(3) { opacity: 0.35; }
.cover--window .panes span:nth-child(4) { opacity: 0.75; }
.book:hover .panes span, .book:focus-within .panes span { opacity: 1; }
.book:hover .panes span:nth-child(1), .book:focus-within .panes span:nth-child(1) { opacity: 0.4; }
.cover--window .beam {
  position: absolute; inset: 0;
  background: linear-gradient(200deg, rgba(219,165,119,0) 40%, rgba(219,165,119,0.10) 62%, rgba(219,165,119,0) 80%);
}

.book__meta { margin-top: 22px; max-width: 340px; }
.book__year {
  font-size: var(--step--2); font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--copper-light);
}
.book__title {
  margin-top: 8px;
  font-family: var(--serif); font-size: var(--step-1); font-weight: 380;
  line-height: 1.25; text-wrap: balance;
}
.book__note { margin-top: 8px; font-size: var(--step--1); color: var(--foam-2); line-height: 1.6; }

/* ── Writing ─────────────────────────────────────────────────────────── */

.writing__grid { display: grid; gap: clamp(56px, 7vw, 96px); }
@media (min-width: 960px) {
  .writing__grid { grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); align-items: start; }
}
.columns { margin-top: 32px; border-top: 1px solid var(--foam-rule); }
.columns li { border-bottom: 1px solid var(--foam-rule); }
.columns a {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 24px;
  align-items: baseline;
  padding: 22px 0;
  text-decoration: none;
}
.columns__title {
  font-family: var(--serif); font-size: var(--step-1); font-weight: 360;
  line-height: 1.3; text-wrap: balance;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size 0.5s var(--ease-out);
  padding-bottom: 2px;
}
.columns a:hover .columns__title, .columns a:focus-visible .columns__title { background-size: 100% 1px; }
.columns__date {
  grid-row: 2; font-size: var(--step--2); font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--foam-2);
}
.columns__arrow {
  grid-row: 1 / span 2; align-self: center;
  width: 28px; height: 28px; color: var(--copper-light);
  transition: transform 0.4s var(--ease-out);
}
.columns a:hover .columns__arrow { transform: translate(4px, -4px); }

.more {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 28px; min-height: 44px;
  font-size: var(--step--1); font-weight: 500;
  color: var(--copper-light); text-decoration: none;
  border-bottom: 1px solid rgba(219, 165, 119, 0.4);
  transition: border-color 0.3s, gap 0.3s var(--ease-out);
}
.more:hover { border-color: var(--copper-light); gap: 14px; }

.ff {
  position: relative;
  padding: clamp(28px, 3.5vw, 40px);
  border: 1px solid var(--foam-rule);
  border-radius: 4px;
  background: linear-gradient(160deg, rgba(43, 83, 113, 0.35), rgba(12, 36, 57, 0.2));
  overflow: hidden;
}
.ff::before {
  content: ""; position: absolute; right: -60px; top: -60px;
  width: 200px; height: 200px; border-radius: 50%;
  border: 1px solid rgba(219, 165, 119, 0.35);
}
.ff::after {
  content: ""; position: absolute; right: -20px; top: -20px;
  width: 120px; height: 120px; border-radius: 50%;
  border: 1px solid rgba(219, 165, 119, 0.25);
}
.ff__name {
  margin-top: 22px;
  font-family: var(--serif); font-size: var(--step-2); font-weight: 340;
  line-height: 1.12; letter-spacing: -0.01em;
}
.ff__text { margin-top: 16px; font-size: var(--step--1); color: var(--foam-2); line-height: 1.65; }

/* pull quote + Female Founders quote */
.pull { font-size: var(--step-2); line-height: 1.22; max-width: 26ch; }
.pull-src {
  margin-top: 18px;
  font-size: var(--step--1); color: var(--foam-2);
}
.pull-src cite { font-style: italic; font-family: var(--serif); color: var(--foam); }
.writing__grid .columns { margin-top: clamp(40px, 5vw, 56px); }
.ff__quote {
  margin-top: 22px; padding-left: 16px;
  border-left: 1px solid var(--copper-light);
}
.ff__quote p { font-family: var(--serif); font-style: italic; font-size: 1.06rem; line-height: 1.5; color: var(--foam); }
.ff .more { margin-top: 22px; }

/* ── Contact ─────────────────────────────────────────────────────────── */

.s-contact { padding-bottom: 0; }
.contact__title { margin-top: 28px; max-width: 16ch; font-size: var(--step-4); }
.contact__grid {
  margin-top: clamp(48px, 7vw, 88px);
  display: grid; gap: 0;
  border-top: 1px solid var(--foam-rule);
}
@media (min-width: 900px) { .contact__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.contact__cell { padding: 26px 0; border-bottom: 1px solid var(--foam-rule); }
@media (min-width: 900px) {
  .contact__cell { border-bottom: 0; padding-right: 24px; }
  .contact__cell + .contact__cell { border-left: 1px solid var(--foam-rule); padding-left: 24px; }
}
.contact__k {
  font-size: var(--step--2); font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--foam-2);
}
.contact__v { margin-top: 12px; font-family: var(--serif); font-size: var(--step-1); font-weight: 360; line-height: 1.4; }
.contact__v a {
  text-decoration: none;
  background: linear-gradient(var(--copper-light), var(--copper-light)) 0 100% / 100% 1px no-repeat;
  padding-bottom: 2px;
  transition: color 0.3s;
}
.contact__v a:hover { color: var(--copper-light); }
.contact__v small a { background: none; padding: 0; }
.contact__v small { display: block; margin-top: 6px; font-family: var(--sans); font-size: var(--step--1); color: var(--foam-2); }
.social { display: flex; flex-wrap: wrap; gap: 6px 22px; }

.foot {
  margin-top: clamp(80px, 12vw, 160px);
  padding-block: 28px 36px;
  border-top: 1px solid var(--foam-rule);
  display: flex; flex-wrap: wrap; gap: 14px 36px; justify-content: space-between; align-items: baseline;
  font-size: var(--step--1); color: var(--foam-2);
}
.family { display: flex; flex-wrap: wrap; gap: 6px 24px; }
.family a { text-decoration: none; color: var(--foam); opacity: 0.85; }
.family a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.family span { color: var(--foam-2); }

.signature {
  margin-top: clamp(64px, 9vw, 120px);
  font-family: var(--serif);
  font-size: clamp(3.2rem, 1rem + 11vw, 12rem);
  font-weight: 280;
  font-style: italic;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(237, 243, 246, 0.22);
  white-space: nowrap;
  user-select: none;
}

/* ── Motion: reveals ─────────────────────────────────────────────────── */

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease-out), transform 1.1s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 80ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* hero intro */
.js .name .ch { transform: translateY(105%); }
.js .hero__eyebrow, .js .hero__lede, .js .hero__foot, .js .portrait { opacity: 0; }
.js .portrait { clip-path: inset(100% 0 0 0 round 999px 999px 6px 6px); }
.is-loaded .name .ch {
  transform: none;
  transition: transform 1.25s var(--ease-out);
  transition-delay: calc(0.15s + var(--c, 0) * 42ms);
}
.is-loaded .hero__eyebrow { opacity: 1; transition: opacity 1s 0.1s var(--ease-out); }
.is-loaded .hero__lede { opacity: 1; transition: opacity 1.2s 0.85s var(--ease-out); }
.is-loaded .hero__foot { opacity: 1; transition: opacity 1.2s 1.1s var(--ease-out); }
.is-loaded .portrait {
  opacity: 1;
  clip-path: inset(0 0 0 0 round 999px 999px 6px 6px);
  transition: clip-path 1.6s 0.35s var(--ease-out), opacity 0.4s 0.35s;
}
.portrait img { transform: scale(1.08); transition: transform 2.4s 0.35s var(--ease-out); }
.is-loaded .portrait img { transform: scale(1); }

/* Failsafe: if main.js never runs, show everything after 2.5s. */
.js:not(.is-ready) .reveal,
.js:not(.is-ready) .hero__eyebrow,
.js:not(.is-ready) .hero__lede,
.js:not(.is-ready) .hero__foot,
.js:not(.is-ready) .portrait,
.js:not(.is-ready) .quote .w {
  animation: failsafe 0.01s 2.5s forwards;
}
.js:not(.is-ready) .name .ch { animation: failsafe-y 0.01s 2.5s forwards; }
@keyframes failsafe { to { opacity: 1; transform: none; clip-path: none; } }
@keyframes failsafe-y { to { 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;
    transition-delay: 0s !important;
  }
  .js .reveal, .js .hero__eyebrow, .js .hero__lede, .js .hero__foot, .js .portrait { opacity: 1; transform: none; clip-path: none; }
  .js .name .ch { transform: none; }
  .js .quote .w { opacity: 1; }
  .book__cover { transform: none !important; }
  .cue__line::after { display: none; }
}

@media print {
  .top, .rail, .caustics, .snow, .sheet, .cue { display: none !important; }
  section { background: none !important; color: #000 !important; }
  [data-tone="dark"] { color: #000; }
}

/* ── 404 ─────────────────────────────────────────────────────────────── */
.lost {
  min-height: 100svh;
  display: grid; align-content: center; justify-items: start; gap: 24px;
  padding: 24px var(--gutter);
  max-width: var(--maxw); margin-inline: auto;
  color: var(--foam);
}
body:has(.lost) { background: linear-gradient(180deg, var(--deep), var(--abyss)); }