/* ============================================================
   DELFIN DESIGN — "Pafta" tasarım sistemi
   Teknik çizim estetiği: kağıt zemin, hairline çizgiler,
   mono anotasyonlar, redline aksan.
   ============================================================ */

:root {
  --paper: #f0f0f0;
  --paper-2: #e4e4e4;
  --ink: #06181c;
  --ink-60: rgba(6,24,28, 0.6);
  --ink-40: rgba(6,24,28, 0.4);
  --line: rgba(6,24,28, 0.14);
  --line-soft: rgba(6,24,28, 0.07);
  --accent: #eabe64;
  --font-display: "Montserrat", sans-serif;
  --font-body: "Montserrat", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --display-weight: 800;
  --display-case: uppercase;
  --display-tracking: -0.02em;
  --display-lh: 0.96;
  --gutter: clamp(20px, 4vw, 64px);
  --maxw: 1480px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--ink); }

/* ---------- Pafta ızgarası (arka plan çizgileri) ---------- */
.sheet-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  display: flex; justify-content: space-between;
  padding: 0 var(--gutter);
  max-width: var(--maxw); margin: 0 auto; left: 0; right: 0;
  opacity: 1; transition: opacity 0.4s;
}
.sheet-grid span { width: 1px; background: var(--line-soft); }
body[data-grid="off"] .sheet-grid { opacity: 0; }

/* ---------- Mono anotasyonlar ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.mono.accent { color: var(--accent); }
.tick { color: var(--accent); }

/* Ölçü çizgisi: yatay hairline, görünür olunca çizilir */
.dim-line {
  position: relative; height: 1px; background: var(--line);
  transform-origin: left center;
}
.js .dim-line { transform: scaleX(0); transition: transform 1.1s cubic-bezier(0.22, 1, 0.36, 1); }
.js .dim-line.is-in { transform: scaleX(1); }
.dim-line::before, .dim-line::after {
  content: ""; position: absolute; top: -3.5px; width: 1px; height: 8px;
  background: var(--line);
}
.dim-line::before { left: 0; } .dim-line::after { right: 0; }

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); position: relative; z-index: 1; }
section { position: relative; z-index: 1; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 0.4s, border-color 0.4s;
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.site-header .wrap {
  display: flex; align-items: stretch; justify-content: space-between;
  height: 64px;
}
.logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 800; white-space: nowrap; }
.logo .logo-mark { width: 16px; height: 16px; flex: none; display: block; }
.logo em, .footer-brand em { font-style: normal; color: var(--accent); }
.main-nav { display: flex; align-items: stretch; }
.main-nav a {
  display: flex; align-items: center; padding: 0 18px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-60); border-left: 1px solid var(--line-soft);
  position: relative; transition: color 0.25s;
}
.main-nav a:last-child { border-right: 1px solid var(--line-soft); }
.main-nav a::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 16px; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.main-nav a:hover { color: var(--ink); }
.main-nav a:hover::after, .main-nav a.is-active::after { transform: scaleX(1); }
.main-nav a.is-active { color: var(--ink); }
.sheet-no { display: flex; align-items: center; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--ink-40); }

/* Sayfa-üstü hero'da header ters renk */
.site-header.on-dark:not(.is-scrolled) { color: #f0f0f0; }
.site-header.on-dark:not(.is-scrolled) .main-nav a { color: rgba(240,240,240, 0.72); border-color: rgba(240,240,240, 0.18); }
.site-header.on-dark:not(.is-scrolled) .main-nav a:hover,
.site-header.on-dark:not(.is-scrolled) .main-nav a.is-active { color: #fff; }
.site-header.on-dark:not(.is-scrolled) .sheet-no { color: rgba(240,240,240, 0.5); }

/* ---------- Display tipografi ---------- */
.display {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  text-transform: var(--display-case);
  letter-spacing: var(--display-tracking);
  line-height: var(--display-lh);
}
h1.display { font-size: clamp(44px, 7.2vw, 116px); }
h2.display { font-size: clamp(34px, 4.6vw, 72px); }
h3.display { font-size: clamp(22px, 2.4vw, 36px); }

.lede { font-size: clamp(17px, 1.4vw, 21px); line-height: 1.7; color: var(--ink-60); max-width: 62ch; text-wrap: pretty; }

/* ---------- Satır satır başlık reveal ---------- */
.reveal-lines .line { display: block; overflow: hidden; }
.reveal-lines .line > span { display: inline-block; }
.js .reveal-lines .line > span { transform: translateY(110%); transition: transform 1s cubic-bezier(0.22, 1, 0.36, 1); }
.js .reveal-lines .line:nth-child(2) > span { transition-delay: 0.1s; }
.js .reveal-lines .line:nth-child(3) > span { transition-delay: 0.2s; }
.js .reveal-lines.is-in .line > span { transform: translateY(0); }

/* ---------- Scroll reveal ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(28px); transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.22, 1, 0.36, 1); }
.js [data-reveal].is-in { opacity: 1; transform: none; }
.js [data-reveal="left"] { transform: translateX(-28px); }
.js [data-reveal="left"].is-in { transform: none; }

/* ---------- Görsel çerçevesi (paralaks + crop işaretleri) ---------- */
.figure { position: relative; overflow: hidden; background: var(--paper-2); }
.figure img { width: 100%; height: 100%; object-fit: cover; }
.js .figure[data-parallax] img { height: 116%; will-change: transform; }
.figure .fig-tag {
  position: absolute; left: 12px; bottom: 12px; z-index: 2;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--paper); color: var(--ink-60); padding: 5px 9px;
}

/* Köşe crop işaretleri */
.cropmarks::before, .cropmarks::after,
.cropmarks .cm::before, .cropmarks .cm::after { content: ""; position: absolute; width: 14px; height: 14px; z-index: 2; }
.cropmarks::before { top: -1px; left: -1px; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.cropmarks::after { top: -1px; right: -1px; border-top: 1px solid var(--ink); border-right: 1px solid var(--ink); }
.cropmarks .cm::before { bottom: -1px; left: -1px; border-bottom: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.cropmarks .cm::after { bottom: -1px; right: -1px; border-bottom: 1px solid var(--ink); border-right: 1px solid var(--ink); }

/* ---------- Butonlar ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 14px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  border: 1px solid var(--ink); padding: 16px 26px; color: var(--ink);
  position: relative; overflow: hidden; transition: color 0.35s; cursor: pointer; background: transparent;
}
.btn::before { content: ""; position: absolute; inset: 0; background: var(--ink); transform: scaleY(0); transform-origin: bottom; transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1); z-index: 0; }
.btn:hover::before { transform: scaleY(1); }
.btn:hover { color: var(--paper); }
.btn > * { position: relative; z-index: 1; }
.btn .arrow { transition: transform 0.3s; }
.btn:hover .arrow { transform: translateX(5px); }
.btn.light { border-color: #f0f0f0; color: #f0f0f0; }
.btn.light::before { background: #f0f0f0; }
.btn.light:hover { color: var(--ink); }

/* ---------- Bölüm başlığı satırı ---------- */
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; margin-bottom: clamp(28px, 4vw, 56px); }
.section-head .kicker { display: flex; align-items: center; gap: 12px; }
.section-head .kicker .idx { color: var(--accent); }

/* ---------- Footer: çizim anteti ---------- */
.site-footer { position: relative; z-index: 1; margin-top: clamp(80px, 10vw, 160px); border-top: 1px solid var(--ink); background: var(--paper); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; }
.footer-grid > div { padding: 32px 28px 40px; border-right: 1px solid var(--line); }
.footer-grid > div:last-child { border-right: none; }
.footer-grid h4 { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-40); font-weight: 400; margin-bottom: 16px; }
.footer-grid a { display: block; font-size: 14px; padding: 4px 0; color: var(--ink-60); transition: color 0.2s; }
.footer-grid a:hover { color: var(--accent); }
.footer-meta { border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; padding: 14px var(--gutter); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-40); flex-wrap: wrap; gap: 8px; }
.footer-brand { font-family: var(--font-display); font-weight: var(--display-weight); text-transform: var(--display-case); font-size: clamp(26px, 2.6vw, 40px); line-height: 1; margin-bottom: 10px; }

/* ---------- Sayfa geçiş perdesi ---------- */
.page-veil { position: fixed; inset: 0; z-index: 999; background: var(--ink); pointer-events: none; transform-origin: top; }
.js .page-veil { animation: veilOut 0.9s cubic-bezier(0.76, 0, 0.24, 1) 0.1s forwards; }
@keyframes veilOut { to { transform: scaleY(0); transform-origin: top; } }
.page-veil.closing { animation: veilIn 0.5s cubic-bezier(0.76, 0, 0.24, 1) forwards !important; transform-origin: bottom; }
@keyframes veilIn { from { transform: scaleY(0); } to { transform: scaleY(1); } }
.no-js .page-veil { display: none; }

/* ---------- Lightbox ---------- */
.lightbox { position: fixed; inset: 0; z-index: 500; background: rgba(4,16,20, 0.96); display: none; align-items: center; justify-content: center; }
.lightbox.open { display: flex; }
.lightbox img { max-width: min(86vw, 1400px); max-height: 84vh; object-fit: contain; }
.lightbox button { position: absolute; background: none; border: 1px solid rgba(240,240,240, 0.3); color: #f0f0f0; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; padding: 10px 16px; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.lightbox button:hover { border-color: #f0f0f0; background: rgba(240,240,240, 0.08); }
.lightbox .lb-close { top: 24px; right: 24px; }
.lightbox .lb-prev { left: 24px; top: 50%; transform: translateY(-50%); }
.lightbox .lb-next { right: 24px; top: 50%; transform: translateY(-50%); }
.lightbox .lb-idx { position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%); color: rgba(240,240,240, 0.6); }

/* ---------- Filtre çipleri ---------- */
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-row button { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; background: none; border: 1px solid var(--line); color: var(--ink-60); padding: 9px 16px; cursor: pointer; transition: all 0.25s; }
.filter-row button:hover { border-color: var(--ink); color: var(--ink); }
.filter-row button.is-active { background: var(--ink); border-color: var(--ink); color: var(--paper); }

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal], .js .dim-line, .js .reveal-lines .line > span { opacity: 1 !important; transform: none !important; transition: none !important; animation: none !important; }
  .js .page-veil { animation-duration: 0.01s; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .main-nav a { padding: 0 10px; font-size: 10px; }
  .sheet-no { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div { border-bottom: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .main-nav { overflow-x: auto; }
  .footer-grid { grid-template-columns: 1fr; }
}