/* ============================================================
   erselerbay.com - shared stylesheet
   Edit colors & fonts here; every page uses this file.
   ============================================================ */

/* Self-hosted fonts (no Google Fonts request - GDPR-friendly, faster) */
@font-face {
  font-family: "Bricolage Grotesque";
  src: url("/fonts/bricolage-grotesque-latin-wght-normal.woff2") format("woff2-variations");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("/fonts/instrument-sans-latin-wght-normal.woff2") format("woff2-variations");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/ibm-plex-mono-latin-600-normal.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #f5f3ee;
  --card: #ffffff;
  --ink: #1a1f1e;
  --muted: #5e6663;
  --line: #e2ded4;
  --accent: #14655b;
  --accent-dark: #0e4a43;
  --accent-soft: #e4eeeb;
  --gold: #c08a2d;
  --prose: #3c4341;
  --header-bg: rgba(245, 243, 238, 0.88);
  --shadow: rgba(26, 31, 30, 0.09);

  --font-display: "Bricolage Grotesque", Georgia, serif;
  --font-body: "Instrument Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --maxw: 1060px;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.brand .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: 7px 13px;
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.95rem;
}
.nav-links a:hover { background: var(--accent-soft); text-decoration: none; }
.nav-links a[aria-current="page"] {
  background: var(--ink);
  color: var(--paper);
}

.nav-toggle { display: none; }

/* ---------- Hero ---------- */

.hero { padding: 88px 0 56px; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}

h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 6.5vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  margin: 0 0 22px;
}

h1 .accent { color: var(--accent); }

.lede {
  font-size: 1.16rem;
  color: var(--muted);
  max-width: 42em;
  margin: 0 0 34px;
}

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--gold);
  vertical-align: -0.1em;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1.5px solid var(--ink);
  transition: transform 0.12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-ghost { color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--accent-soft); }


/* ---------- Hero portrait (home) ---------- */

.hero-grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-portrait {
  width: 100%;
  max-width: 340px;
  justify-self: end;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px var(--shadow);
}

/* ---------- Sections ---------- */

section { padding: 44px 0; }

h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.22rem;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.section-intro { color: var(--muted); max-width: 44em; margin-top: 0; }

/* ---------- Cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card .k {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; }
.card h3 { margin-bottom: 8px; }

/* ---------- Timeline (resume) ---------- */

.timeline { margin-top: 10px; }

.t-item {
  display: grid;
  grid-template-columns: 175px 1fr;
  gap: 26px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.t-item:last-child { border-bottom: 0; }

.t-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  padding-top: 4px;
  white-space: nowrap;
}

.t-body h3 { margin-bottom: 2px; }

.t-org {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.98rem;
  margin: 0 0 10px;
}

.t-body ul { margin: 0; padding-left: 20px; color: var(--muted); }
.t-body li { margin-bottom: 7px; font-size: 0.97rem; }
.t-body li:last-child { margin-bottom: 0; }
.t-note { color: var(--muted); font-style: italic; font-size: 0.95rem; margin: 6px 0 0; }

/* ---------- Skills ---------- */

.skill-group { margin-bottom: 22px; }
.skill-group .k {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 13px;
  font-size: 0.87rem;
  color: var(--ink);
}

/* ---------- Player card (signature element) ---------- */

.player-card {
  background: #161b1a;
  color: #e8ebe9;
  border-radius: var(--radius);
  padding: 28px 30px;
  font-family: var(--font-mono);
  margin-top: 30px;
  position: relative;
  overflow: hidden;
}
.player-card::after {
  content: "▲ ▲ ● ■";
  position: absolute;
  right: 24px;
  top: 22px;
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  color: var(--gold);
  opacity: 0.85;
}
.player-card .pc-title {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 18px;
}
.pc-grid {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 10px 40px;
}
.pc-stat .n {
  font-size: 1.3rem;
  font-weight: 600;
  color: #fff;
  display: block;
  font-variant-numeric: tabular-nums;
}
.pc-stat .l {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #9aa5a1;
}
.pc-stat a { color: #fff; }
.pc-stat a:hover { color: var(--gold); }

/* ---------- Projects ---------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 26px;
}

.project {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.project:hover { transform: translateY(-3px); box-shadow: 0 10px 28px var(--shadow); }

.project img { aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }

.project .p-body { padding: 20px 22px 24px; }
.project .p-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
}
.project p { color: var(--muted); font-size: 0.95rem; margin: 0; }
.project h3 a { color: var(--ink); }
.project h3 a:hover { color: var(--accent); }

/* ---------- About / prose ---------- */

.prose { max-width: 46em; }
.prose p { color: var(--prose); }
.prose ul { color: var(--prose); padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.portrait {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 26px;
}
.contact-grid .card a { font-weight: 600; word-break: break-all; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 34px 0 44px;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
}
.footer-links { display: flex; gap: 18px; }

/* ---------- Responsive ---------- */

@media (max-width: 820px) {
  .card-grid, .contact-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .pc-grid { grid-template-columns: repeat(2, auto); }
  .t-item { grid-template-columns: 1fr; gap: 6px; }
  .hero { padding: 56px 0 36px; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-portrait { justify-self: start; max-width: 240px; }

  .nav-toggle {
    display: block;
    background: none;
    border: 1.5px solid var(--ink);
    border-radius: 8px;
    padding: 6px 12px;
    font: inherit;
    cursor: pointer;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 10px 24px 18px;
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav { position: relative; }
}

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


/* ---------- Case studies (product & analysis work) ---------- */

.case {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-top: 22px;
}
.case .p-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
}
.case p { color: var(--prose); font-size: 0.98rem; }
.case .outcome {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}
.case .outcome div { font-family: var(--font-mono); }
.case .outcome .n { font-size: 1.25rem; font-weight: 600; color: var(--accent); display: block; font-variant-numeric: tabular-nums; }
.case .outcome .l { font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }

/* ---------- Dark mode (follows system preference) ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141817;
    --card: #1c2220;
    --ink: #e9ecea;
    --muted: #9aa5a1;
    --line: #2b3330;
    --accent: #56c7b4;
    --accent-dark: #7fdccb;
    --accent-soft: rgba(86, 199, 180, 0.13);
    --gold: #d9a84e;
    --prose: #c4ccc9;
    --header-bg: rgba(20, 24, 23, 0.88);
    --shadow: rgba(0, 0, 0, 0.45);
  }
  .player-card { border: 1px solid var(--line); }
  .btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #10201c; }
}