/* ==========================================================================
   Ari Cilingiroglu — Portfolio v2
   Design system: dark, modern, tech-forward
   ========================================================================== */

:root {
  /* Surfaces */
  --bg: #08090a;
  --bg-alt: #0d0f10;
  --bg-card: #101214;
  --bg-card-hover: #141618;
  --border: #232527;
  --border-light: #2e3133;

  /* Text */
  --text: #ededea;
  --text-dim: #9a9994;
  --text-dimmer: #67665f;

  /* Accents */
  --accent: #ffb000;       /* amber */
  --accent-2: #ffb000;     /* single accent, no second color */
  --accent-soft: rgba(255, 176, 0, 0.1);
  --accent-2-soft: rgba(255, 176, 0, 0.12);

  /* Type */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Layout */
  --container: 1100px;
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(circle at 50% 0%, rgba(255, 176, 0, 0.045), transparent 45%);
}

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

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 16px; font-weight: 700; letter-spacing: -0.02em; }
p { margin: 0 0 16px; color: var(--text-dim); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--text); }

.mono { font-family: var(--font-mono); }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.eyebrow::before { content: "// "; color: var(--text-dimmer); }

/* ---------- Header / Nav ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 9, 10, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
header nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.logo span { color: var(--accent); }
.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 28px;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.active { color: var(--accent); }
.lang-switch {
  display: flex;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.lang-switch a {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-dimmer);
  border: 1px solid transparent;
}
.lang-switch a.active {
  color: var(--accent);
  border-color: var(--border-light);
  background: var(--accent-soft);
}
.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--accent);
  color: #14100a;
}
.btn-primary:hover { background: #ffcc55; color: #14100a; }
.btn-outline {
  border-color: var(--border-light);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Hero ---------- */
.hero {
  padding: 100px 0 70px;
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: 3.2rem;
  margin-bottom: 18px;
}
.hero h1 .highlight { color: var(--accent); }
.hero .lead {
  font-size: 1.15rem;
  max-width: 620px;
  color: var(--text-dim);
  margin-bottom: 32px;
}
.hero-meta {
  display: flex;
  gap: 24px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero-meta div {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dimmer);
}
.hero-meta strong { color: var(--text); display: block; font-size: 1rem; font-family: var(--font-body); }

/* ---------- Section shell ---------- */
section.block { padding: 70px 0; }
section.block.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head h2 { font-size: 2rem; }
.section-head p { font-size: 1.02rem; }

/* ---------- Cards / Grid ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

/* Case-study image row (flagship projects) */
.case-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}
.case-images img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #0d1117;
}
.case-images.single { grid-template-columns: 1fr; }
.case-images.single img {
  height: auto;
  max-height: 480px;
  object-fit: contain;
  background: #000;
}
@media (max-width: 640px) {
  .case-images { grid-template-columns: 1fr; }
}

/* Project cards */
.project-card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  border: 1px solid var(--border);
}
.project-card.featured {
  grid-column: span 1;
}
.project-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.project-card .case { margin: 14px 0; }
.project-card .case dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-2);
  margin-top: 12px;
}
.project-card .case dd { margin: 4px 0 0; color: var(--text-dim); font-size: 0.94rem; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--accent-2-soft);
  color: var(--accent-2);
  border: 1px solid rgba(255, 176, 0, 0.22);
}

.card-links { display: flex; gap: 16px; margin-top: 16px; font-size: 0.88rem; font-weight: 600; }

/* Compact project list (secondary projects) */
.mini-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.mini-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  background: var(--bg-card);
}
.mini-card h4 { font-size: 0.98rem; margin-bottom: 6px; }
.mini-card p { font-size: 0.88rem; margin-bottom: 10px; }
.mini-card .tags { margin: 0; }
.mini-card .tag { font-size: 0.68rem; padding: 3px 8px; }

/* ---------- Skills ---------- */
.skills-group { margin-bottom: 34px; }
.skills-group h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.skills-group .tags .tag {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border-light);
  font-size: 0.85rem;
  padding: 8px 14px;
}

/* ---------- Timeline (experience) ---------- */
.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 6px; bottom: 6px;
  width: 1px;
  background: var(--border-light);
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -34px; top: 4px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline-item .role { font-size: 1.08rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.timeline-item .org { font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent-2); margin-bottom: 10px; }
.timeline-item p { margin-bottom: 0; }

/* ---------- Testimonial ---------- */
.testimonial {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 26px;
  margin: 0;
}
.testimonial blockquote { margin: 0 0 14px; font-size: 1.08rem; color: var(--text); font-style: italic; }
.testimonial cite { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-dimmer); font-style: normal; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.contact-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: left;
  background: var(--bg-card);
}
.contact-card .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dimmer);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.contact-card a, .contact-card span { font-size: 1.02rem; color: var(--text); font-weight: 600; word-break: break-word; }
.contact-card a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
footer p { margin: 0; font-size: 0.85rem; color: var(--text-dimmer); }
footer .social-links { display: flex; gap: 20px; }
footer .social-links a { color: var(--text-dim); font-size: 0.88rem; font-weight: 500; }
footer .social-links a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .grid-2, .grid-3, .mini-list, .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.3rem; }
  section.block { padding: 50px 0; }
  .nav-links { display: none; }
  .nav-toggle {
    display: block;
    background: none;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 6px 10px;
    font-family: var(--font-mono);
    cursor: pointer;
  }
  header nav.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
  }
}