/* ==========================================================================
   Berkant Şahin — kişisel site
   Tasarım sistemi: koyu lacivert + mor vurgu (design canvas'ta onaylandı)
   ========================================================================== */

:root{
  --bg: oklch(0.16 0.025 265);
  --bg-soft: oklch(0.19 0.028 265);
  --surface: oklch(0.22 0.032 265);
  --surface-2: oklch(0.245 0.032 265);
  --border: oklch(0.32 0.03 265);
  --text: oklch(0.96 0.01 265);
  --text-muted: oklch(0.68 0.02 265);
  --accent: oklch(0.66 0.19 300);
  --accent-strong: oklch(0.72 0.20 300);
  --green: oklch(0.72 0.15 150);
  --orange: oklch(0.75 0.15 55);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

:root[data-theme="light"]{
  --bg: oklch(0.985 0.004 265);
  --bg-soft: oklch(0.965 0.006 265);
  --surface: oklch(1 0 0);
  --surface-2: oklch(0.97 0.005 265);
  --border: oklch(0.89 0.008 265);
  --text: oklch(0.20 0.02 265);
  --text-muted: oklch(0.47 0.02 265);
  --accent: oklch(0.58 0.19 300);
  --accent-strong: oklch(0.52 0.20 300);
  --green: oklch(0.55 0.14 150);
  --orange: oklch(0.62 0.17 50);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; overflow-x: hidden; }
body{
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  transition: background-color .2s ease, color .2s ease;
}
a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display: block; }
.container{ max-width: 1200px; margin: 0 auto; padding: 0 24px; }

@media (max-width: 720px){
  .container{ padding: 0 18px; }
}

/* ---------- Nav ---------- */
.site-nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 22px 24px;
  border-bottom: 1px solid var(--border);
  max-width: 1200px; margin: 0 auto;
  flex-wrap: wrap; gap: 14px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:38px; height:38px; border-radius:50%;
  object-fit: cover;
  border: 1.5px solid var(--border);
  flex-shrink:0;
}
.brand-name{ font-family: var(--font-display); font-weight:600; font-size:17px; }

.brand{ order:1; }
.nav-links{ order:2; display:flex; align-items:center; gap:30px; flex-wrap:wrap; }
.nav-right{ order:3; display:flex; align-items:center; gap:10px; }
.nav-links a{ font-size:14.5px; color: var(--text-muted); font-weight:500; }
.nav-links a:hover, .nav-links a.active{ color: var(--accent); }

.theme-toggle{
  display:flex; align-items:center; gap:4px;
  background: var(--surface); border:1px solid var(--border); border-radius:999px;
  padding:4px; flex-shrink:0;
}
.theme-toggle button{
  width:28px; height:28px; border-radius:999px; border:none; background:transparent;
  display:flex; align-items:center; justify-content:center; cursor:pointer; color: var(--text-muted);
}
.theme-toggle button.on{ background: var(--accent); color:white; }
.theme-toggle svg{ width:15px; height:15px; }

.nav-burger{
  display:none; width:38px; height:38px; border-radius:10px;
  background: var(--surface); border:1px solid var(--border); color: var(--text);
  align-items:center; justify-content:center; cursor:pointer; flex-shrink:0;
}
.nav-burger svg{ width:19px; height:19px; }

@media (max-width: 720px){
  .site-nav{ padding: 16px 18px; }
  .brand-name{ font-size:15.5px; }
  .nav-burger{ display:flex; }
  .nav-links{
    display:none; order:4; width:100%; flex-basis:100%;
    flex-direction:column; align-items:stretch; gap:2px;
    margin-top: 6px; padding-top: 10px; border-top:1px solid var(--border);
  }
  .nav-links a{ padding:12px 6px; font-size:15.5px; border-radius:8px; }
  .nav-links a:hover{ background: var(--bg-soft); }
  body.nav-open .nav-links{ display:flex; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 24px; border-radius:10px; font-weight:600; font-size:14.5px;
  border:1px solid transparent; cursor:pointer; font-family: var(--font-body);
}
.btn-primary{ background: var(--accent); color:white; }
.btn-primary:hover{ background: var(--accent-strong); }
.btn-ghost{ background:transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover{ border-color: var(--accent); color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer{
  display:flex; align-items:center; justify-content:space-between;
  padding: 26px 24px; border-top:1px solid var(--border);
  color: var(--text-muted); font-size:13px;
  max-width:1200px; margin:0 auto; flex-wrap:wrap; gap:10px;
}
.site-footer a:hover{ color: var(--accent); }

/* ---------- Page header (shared across inner pages) ---------- */
.page-header{
  padding: 56px 24px 32px; max-width:1200px; margin:0 auto;
  display:flex; align-items:flex-end; justify-content:space-between; gap:24px; flex-wrap:wrap;
}
.page-header h1{ font-family: var(--font-display); font-size:40px; margin:0 0 8px; font-weight:700; letter-spacing:-0.01em; }
.page-header p{ margin:0; color: var(--text-muted); font-size:15px; max-width:560px; }

@media (max-width: 640px){
  .page-header{ padding: 36px 18px 24px; }
  .page-header h1{ font-size:30px; }
}

/* ---------- Cards ---------- */
.card{
  background: var(--surface); border:1px solid var(--border); border-radius:16px;
  padding:26px;
}

/* utility */
.mono{ font-family: var(--font-mono); }
.text-muted{ color: var(--text-muted); }

@media print{
  .site-nav, .site-footer, .no-print{ display:none !important; }
  body{ background:#fff; color:#000; }
}