/* Yunus Balcı — personal site styles */

:root {
  --bg: #090d14;
  --bg-elev: #0f1520;
  --bg-card: #121a27;
  --line: #222d3f;
  --text: #e8ecf3;
  --text-dim: #a2adc2;
  --text-faint: #6b778f;
  --accent: #3ee6a8;   /* neon green */
  --accent-hover: #6bf0bf;
  --accent-2: #36b9ff; /* cyan */
  --hot: #ff5d73;      /* tail-light red */
  --radius: 16px;
  --maxw: 1120px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

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

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.4rem, 6.4vw, 4.6rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 600; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 8px;
  background: var(--accent); color: var(--bg); padding: 8px 14px; border-radius: 8px; z-index: 100;
}
.skip-link:focus { left: 8px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(9, 13, 20, .78);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  font-size: .9rem; color: var(--bg);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.nav { display: flex; gap: 4px; }
.nav a {
  color: var(--text-dim); font-weight: 500; font-size: .95rem;
  padding: 8px 14px; border-radius: 999px; transition: color .15s, background .15s;
}
.nav a:hover { color: var(--text); background: var(--bg-card); text-decoration: none; }
.nav a.active { color: var(--text); background: var(--bg-card); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px;
  font-weight: 600; font-size: .95rem;
  border: 1px solid var(--line); color: var(--text); background: var(--bg-card);
  transition: transform .15s, background .15s, border-color .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); border-color: #3a4a66; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 112px 0 96px; min-height: min(88vh, 820px); display: flex; align-items: center; }
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; opacity: .9; }
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, var(--bg) 0%, rgba(9, 13, 20, .75) 45%, rgba(9, 13, 20, .1) 100%);
}
.hero .container { position: relative; z-index: 1; }
.eyebrow {
  display: inline-block; font-family: var(--font-mono); font-size: .8rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: 1.2rem; color: var(--text-dim); max-width: 40ch; margin-bottom: 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-actions.center { justify-content: center; }

.stats { display: flex; flex-wrap: wrap; gap: 16px 48px; margin: 56px 0 0; }
.stats dt { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; color: var(--text-faint); }
.stats dd { margin: 4px 0 0; font-family: var(--font-display); font-weight: 600; font-size: 1.5rem; }

/* ---------- Sections ---------- */
.section { padding: 96px 0; border-top: 1px solid var(--line); }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head p { color: var(--text-dim); font-size: 1.1rem; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
.about-text p { color: var(--text-dim); font-size: 1.08rem; }
.about-text strong { color: var(--text); }

.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 24px 0 0; }
.tags li {
  font-size: .85rem; font-weight: 500; padding: 5px 12px; border-radius: 999px;
  background: var(--bg-card); border: 1px solid var(--line); color: var(--text-dim);
}
.tags.small { margin: 0; gap: 6px; }
.tags.small li { font-size: .78rem; padding: 3px 10px; }

/* ---------- Projects ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.project {
  display: flex; flex-direction: column; gap: 14px;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: transform .2s, border-color .2s;
}
.project:hover { transform: translateY(-3px); border-color: #3a4a66; }
.project.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(62, 230, 168, .10), rgba(54, 185, 255, .08)), var(--bg-card);
}
.project.featured h3 { font-size: 1.6rem; }
.project h3 { margin: 0; }
.project p { color: var(--text-dim); margin: 0; }
.project-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.project .date { font-family: var(--font-mono); font-size: .78rem; color: var(--text-faint); }
.project .links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: auto; padding-top: 4px; font-weight: 600; font-size: .95rem; }

.badge {
  display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  padding: 3px 10px; border-radius: 999px;
  background: rgba(62, 230, 168, .12); color: var(--accent);
}
.badge.alt { background: rgba(54, 185, 255, .12); color: var(--accent-2); }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; max-width: 820px; }
.timeline li {
  display: grid; grid-template-columns: 140px 1fr; gap: 24px;
  padding: 0 0 36px; position: relative;
}
.timeline .when { font-family: var(--font-mono); font-size: .85rem; color: var(--accent); padding-top: 3px; }
.timeline li > div { border-left: 1px solid var(--line); padding-left: 24px; position: relative; }
.timeline li > div::before {
  content: ""; position: absolute; left: -5px; top: 8px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px rgba(62, 230, 168, .15);
}
.timeline h3 { margin: 0 0 4px; }
.timeline .where { color: var(--text-faint); font-size: .9rem; margin-bottom: 8px; }
.timeline p { color: var(--text-dim); }

/* ---------- References ---------- */
.quotes { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.quote {
  margin: 0; background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  display: flex; flex-direction: column; gap: 20px;
}
.quote blockquote { margin: 0; font-family: var(--font-display); font-size: 1.25rem; line-height: 1.4; }
.quote figcaption strong { display: block; }
.quote figcaption span { color: var(--text-faint); font-size: .9rem; }

.certs { margin-top: 48px; }
.certs ul { padding-left: 1.2em; color: var(--text-dim); }
.certs li { margin-bottom: .3em; }
.certs strong { color: var(--text); }
.certs .langs { color: var(--text-faint); }

/* ---------- Contact ---------- */
.contact-box {
  background: linear-gradient(135deg, rgba(62, 230, 168, .14), rgba(54, 185, 255, .10));
  border: 1px solid var(--line); border-radius: 24px; padding: 48px; text-align: center;
}
.contact-box p { color: var(--text-dim); max-width: 48ch; margin: 0 auto 24px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; color: var(--text-faint); font-size: .9rem; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--text-dim); }

/* ---------- 404 ---------- */
.notfound { display: grid; place-items: center; text-align: center; padding: 120px 0; }
.notfound .code {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(6rem, 20vw, 11rem); line-height: 1;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 8px;
}
.notfound p { color: var(--text-dim); margin-bottom: 28px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero { padding: 72px 0 64px; min-height: 0; }
  .hero::after { background: linear-gradient(180deg, rgba(9, 13, 20, .55) 0%, var(--bg) 100%); }
  .about-grid { grid-template-columns: 1fr; gap: 8px; }
  .section { padding: 72px 0; }
  .contact-box { padding: 32px 20px; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; }
  .timeline li > div { margin-left: 4px; }
}
@media (max-width: 560px) {
  .nav a { padding: 8px 8px; font-size: .85rem; }
  .brand span:not(.brand-mark) { display: none; }
  .projects-grid { grid-template-columns: 1fr; }
  .stats { gap: 16px 28px; }
}

.subhead { margin: 24px 0 28px; font-size: 1.1rem; color: var(--text-dim); }