/* ==========================================================================
   BEDIRHAN BUDAK — PERSONAL SITE
   Design concept: "Threat Graph" — a quiet nod to graph-based web/network
   security research (nodes + edges), expressed through a restrained node
   mark, a faint constellation texture in the hero, and connector lines in
   the timeline. Everything else stays disciplined so that one idea reads
   clearly instead of many small ones competing.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* A single, deliberate dark theme — no toggle. A personal/research site
     doesn't need to serve two moods; committing to one keeps it coherent,
     and this one reads calmer than a near-black void. */
  --ink: #eef1f7;
  --ink-soft: #ccd3e2;
  --muted: #93a0b8;
  --paper: #141922;
  --surface: #1b2230;
  --surface-2: #232c3d;
  --border: #313c4f;
  --border-strong: #414e64;
  --signal: #e3a83d;         /* amber/bronze — "flagged" accent */
  --signal-soft: #3a2e12;
  --verified: #43c2b3;       /* teal — "verified" secondary accent */
  --verified-soft: #123330;
  --shadow-color: 220 60% 2%;

  /* Type */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Spacing scale */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;
  --sp-9: 6.5rem;

  /* Radius / shadow */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px hsl(var(--shadow-color) / 0.06), 0 1px 1px hsl(var(--shadow-color) / 0.04);
  --shadow-md: 0 12px 24px -8px hsl(var(--shadow-color) / 0.18), 0 2px 6px hsl(var(--shadow-color) / 0.08);

  --nav-h: 68px;
  --max: 1120px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   2. RESET & BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  height: 100%;
}

body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

main { flex: 1 0 auto; }

/* A faint grain layer — flat, perfectly even color fields are one of the
   quieter tells of a machine-generated page; a little texture reads as
   considered rather than templated. Kept subtle on purpose. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

img, picture, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, textarea { font: inherit; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; }

.container { max-width: var(--max); margin-inline: auto; padding-inline: var(--sp-5); }

/* Skip link — keyboard users can bypass the nav */
.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: -60px;
  background: var(--signal);
  color: #14100a;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 200;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: var(--sp-4); }

/* Consistent, visible focus ring everywhere — a real gap in every earlier version */
:focus-visible {
  outline: 2.5px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY HELPERS
   -------------------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-soft);
}

.section-title { font-size: clamp(1.6rem, 3vw, 2.15rem); margin-top: var(--sp-2); }
.section-lede { color: var(--muted); max-width: 62ch; margin-top: var(--sp-3); font-size: 1.03rem; }

.text-mono { font-family: var(--font-mono); }

/* --------------------------------------------------------------------------
   4. SITE HEADER / NAV
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-primary { display: flex; align-items: center; gap: var(--sp-1); }

.nav-primary > li { position: relative; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  padding: 0.55em 0.85em;
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.2s, background-color 0.2s;
}
.nav-link:hover { color: var(--ink); background: var(--surface-2); }
.nav-link[aria-current="page"] { color: var(--signal); }
.nav-link .chev { width: 9px; height: 9px; transition: transform 0.2s var(--ease); opacity: 0.7; }

.nav-item.is-open .nav-link .chev { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 190px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--sp-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
}
.nav-item.is-open .dropdown,
.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  display: block;
  padding: 0.6em 0.75em;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.dropdown a:hover { background: var(--surface-2); color: var(--ink); }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}
.nav-toggle:hover { background: var(--surface-2); }
.nav-toggle svg { width: 20px; height: 20px; }

/* --------------------------------------------------------------------------
   5. MOBILE NAV
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .nav-primary {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    height: calc(100vh - var(--nav-h));
    background: var(--paper);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-4);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s var(--ease);
  }
  .nav-primary.is-open { transform: translateX(0); }
  .nav-primary > li { width: 100%; }
  .nav-link { width: 100%; padding: 0.9em var(--sp-2); border-radius: var(--radius-sm); }
  .nav-link.has-dropdown { justify-content: space-between; }

  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: none;
    max-height: 0;
    overflow: hidden;
    padding: 0 0 0 var(--sp-4);
    transition: max-height 0.25s var(--ease);
  }
  .nav-item.is-open .dropdown { max-height: 200px; padding-top: var(--sp-1); padding-bottom: var(--sp-2); }
}

/* --------------------------------------------------------------------------
   6. HERO (index page)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--sp-9) var(--sp-8);
  overflow: clip;
}
.hero-graph {
  position: absolute;
  inset: -5% -10% auto auto;
  height: 105%;
  width: 60%;
  opacity: 0.16;
  pointer-events: none;
  color: var(--border-strong);
  mask-image: linear-gradient(to left, black, transparent 85%);
  -webkit-mask-image: linear-gradient(to left, black, transparent 85%);
}
.hero-graph circle { fill: currentColor; }
.hero-graph line { stroke: currentColor; stroke-width: 1; }
.hero-graph .lit { fill: var(--signal); }

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--sp-8);
  align-items: center;
}

.hero-portrait {
  position: relative;
  width: 240px;
  height: 240px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.hero-portrait:hover { border-color: var(--border-strong); }
.hero-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.65) contrast(1.02);
  transform: scale(1.0);
  transition: filter 0.7s var(--ease), transform 0.7s var(--ease);
}
.hero-portrait:hover img { filter: grayscale(0); transform: scale(1.035); }
.hero-portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px hsl(0 0% 100% / 0.06);
}

.hero-name { font-size: clamp(2.3rem, 4.4vw, 3.4rem); }
.hero-name-mark { position: relative; display: inline-block; }
.hero-name-underline {
  position: absolute;
  left: 2%;
  right: 2%;
  bottom: -0.16em;
  width: 96%;
  height: 0.2em;
  color: var(--signal);
  opacity: 0.8;
}
.hero-role {
  margin-top: var(--sp-2);
  color: var(--muted);
  font-size: 1.15rem;
  font-weight: 500;
}
.hero-bio { margin-top: var(--sp-5); display: grid; gap: var(--sp-3); max-width: 62ch; color: var(--ink-soft); }
.hero-bio strong { color: var(--ink); font-weight: 600; }

.hero-actions { margin-top: var(--sp-6); display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-3); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.7em 1.15em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.94rem;
  border: 1px solid transparent;
  transition: transform 0.15s var(--ease), background-color 0.2s, border-color 0.2s, color 0.2s;
}
.btn svg { width: 16px; height: 16px; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--signal); color: #14100a; }
.btn-primary:hover { background: #f0b959; }
.btn-ghost { border-color: var(--border-strong); color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); }

/* --------------------------------------------------------------------------
   7. SECTIONS / REVEAL
   -------------------------------------------------------------------------- */
.section { padding-block: var(--sp-8); border-top: 1px solid var(--border); }
.section-head { margin-bottom: var(--sp-6); }

[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* --------------------------------------------------------------------------
   8. TIMELINE (experience / education)
   -------------------------------------------------------------------------- */
.timeline { position: relative; display: grid; gap: var(--sp-6); }
.timeline::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(var(--border), var(--border) 92%, transparent);
}

.tl-item { position: relative; display: grid; grid-template-columns: 56px 1fr; gap: var(--sp-5); }
.tl-node {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  z-index: 1;
  padding: var(--sp-1);
}
.tl-node img { width: 100%; height: 100%; object-fit: contain; border-radius: 50%; }

.tl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s var(--ease);
}
.tl-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-sm); transform: translateY(-2px); }

.tl-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--sp-2); align-items: baseline; }
.tl-role { font-family: var(--font-body); font-weight: 700; font-size: 1.05rem; }
.tl-org { color: var(--signal); font-weight: 600; }
.tl-org:hover { text-decoration: underline; }
.tl-when { font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
.tl-where { margin-top: var(--sp-1); color: var(--muted); font-size: 0.88rem; display: flex; align-items: center; gap: 0.4em; }
.tl-where svg { width: 13px; height: 13px; }
.tl-mono {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.tl-note {
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px dashed var(--border);
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}
.tl-role em { color: var(--muted); font-style: italic; font-weight: 400; }

/* --------------------------------------------------------------------------
   9. DATA LOG (courses) — a scannable log/table instead of 22 heavy cards
   -------------------------------------------------------------------------- */
.log { border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; background: var(--surface); }
.log-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: var(--sp-4);
  align-items: center;
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.15s;
}
.log-row:last-child { border-bottom: none; }
.log-row:hover { background: var(--surface-2); }
.log-row.log-head {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-2);
}
.log-when { font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted); }
.log-name { font-weight: 600; }
.log-org { color: var(--muted); font-size: 0.92rem; text-align: right; }

@media (max-width: 620px) {
  .log-row { grid-template-columns: 1fr; gap: var(--sp-1); }
  .log-org { text-align: left; }
  .log-row.log-head { display: none; }
}

/* --------------------------------------------------------------------------
   10. CARD GRIDS (certifications / badges)
   -------------------------------------------------------------------------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--sp-5); }

.cert-card {
  display: block;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s var(--ease);
  width: 100%;
}
.cert-card:hover, .cert-card:focus-visible { border-color: var(--signal); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.cert-thumb { aspect-ratio: 1/1; background: var(--surface-2); display: grid; place-items: center; padding: var(--sp-3); }
.cert-thumb img { width: 100%; height: 100%; object-fit: contain; }
.cert-body { padding: var(--sp-4) var(--sp-5); border-top: 1px solid var(--border); }
.cert-title { font-weight: 700; font-size: 0.98rem; }
.cert-meta { margin-top: 0.3em; font-family: var(--font-mono); font-size: 0.76rem; color: var(--muted); }
.cert-desc { margin-top: var(--sp-2); font-size: 0.88rem; color: var(--muted); }

.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: var(--sp-6); max-width: 760px; }
.badge-card {
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  padding: var(--sp-3);
  transition: transform 0.2s var(--ease), border-color 0.2s, box-shadow 0.2s;
}
.badge-card img { width: 100%; height: 100%; object-fit: contain; }
.badge-card:hover, .badge-card:focus-visible { transform: translateY(-7px) scale(1.09); border-color: var(--signal); box-shadow: var(--shadow-md); }


/* --------------------------------------------------------------------------
   11. GALLERY TOOLBAR + LOAD MORE (shared by games/photos)
   -------------------------------------------------------------------------- */
.gallery-meta { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); flex-wrap: wrap; margin-bottom: var(--sp-6); }
.gallery-count { font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); }
.load-more-wrap { display: flex; justify-content: center; margin-top: var(--sp-7); }

/* --------------------------------------------------------------------------
   12. LIGHTBOX
   -------------------------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
  background: hsl(220 40% 4% / 0.82);
  backdrop-filter: blur(6px);
}
.lightbox.is-open { display: flex; }
.lightbox img { max-width: min(90vw, 1000px); max-height: 84vh; border-radius: var(--radius-md); box-shadow: var(--shadow-md); }
.lightbox figcaption { color: #e9ecf3; text-align: center; margin-top: var(--sp-3); font-size: 0.9rem; }
.lightbox-close {
  position: absolute;
  top: var(--sp-5);
  right: var(--sp-5);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: hsl(0 0% 100% / 0.1);
  color: #fff;
  display: grid;
  place-items: center;
}
.lightbox-close:hover { background: hsl(0 0% 100% / 0.18); }
.lightbox-close svg { width: 18px; height: 18px; }

/* --------------------------------------------------------------------------
   13. SOCIAL / CONTACT
   -------------------------------------------------------------------------- */
.social-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-5); }
.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.6em 1em;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-soft);
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}
.social-link svg { width: 15px; height: 15px; }
.social-link:hover { border-color: var(--signal); color: var(--signal); background: var(--signal-soft); }

/* --------------------------------------------------------------------------
   14. PAGE HEADER (interior pages)
   -------------------------------------------------------------------------- */
.page-head { padding-block: var(--sp-8) var(--sp-6); }
.page-head h1 { font-size: clamp(2rem, 4vw, 2.75rem); margin-top: var(--sp-2); }
.page-head p { margin-top: var(--sp-3); color: var(--muted); max-width: 60ch; }

/* --------------------------------------------------------------------------
   15. FOOTER
   -------------------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); padding-block: var(--sp-6); margin-top: var(--sp-8); }
.footer-row { display: flex; justify-content: center; text-align: center; }
.footer-row p { color: var(--muted); font-size: 0.85rem; }

/* --------------------------------------------------------------------------
   16. RESPONSIVE
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .hero-bio { text-align: left; }
  .hero-actions { justify-content: center; }
  .social-row { justify-content: center; }
  .tl-item { grid-template-columns: 40px 1fr; gap: var(--sp-3); }
  .tl-node { width: 40px; height: 40px; }
  .timeline::before { left: 19px; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}

@media (max-width: 520px) {
  .hero-portrait { width: 170px; height: 170px; }
  .nav-wrap { padding-inline: var(--sp-4); }
  .brand { font-size: 0.95rem; }
  .section { padding-block: var(--sp-7); }
  .page-head { padding-block: var(--sp-7) var(--sp-5); }
  .lightbox { padding: var(--sp-4); }
  .lightbox-close { top: var(--sp-3); right: var(--sp-3); width: 38px; height: 38px; }
  :root { --sp-9: 4rem; --sp-8: 3rem; }
}