/* ── Sleek dark theme ─────────────────────────────────────────── */
:root {
  --bg: #1a1713;
  --bg-alt: #211d18;
  --card: #262119;
  --border: #3a332a;
  --text: #e3ddd3;
  --text-dim: #a49a8c;
  --heading: #f6f2ec;
  --accent: #e8825e;      /* warm orange */
  --accent-2: #f0a380;    /* peach */
  --link: #f0a380;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1100px 500px at 80% -10%, rgba(232, 130, 94, 0.07), transparent 60%),
    radial-gradient(900px 450px at -10% 10%, rgba(224, 82, 60, 0.05), transparent 60%);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(26, 23, 19, 0.8);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
}
.nav-name {
  font-weight: 700;
  color: var(--heading);
  text-decoration: none;
  letter-spacing: 0.01em;
  margin-right: auto;
}
.nav-name span { color: var(--accent); }
nav a.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s;
}
nav a.nav-link:hover { color: var(--heading); }
nav a.nav-link.active { color: var(--accent); }

/* ── Typography ── */
h1, h2, h3 { color: var(--heading); line-height: 1.3; }
h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 2.5rem 0 0.5rem; }
h2 {
  font-size: 1.25rem;
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border);
}
h2 .hash { color: var(--accent); margin-right: 0.4rem; }
h3 { font-size: 1.02rem; margin: 1.6rem 0 0.6rem; color: var(--accent-2); }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.dim { color: var(--text-dim); }
.small { font-size: 0.9rem; }

/* ── Hero (home) ── */
.hero {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin: 3rem 0 1rem;
  flex-wrap: wrap;
}
.hero img.profile {
  width: 170px;
  height: 170px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border);
  box-shadow: 0 0 0 6px rgba(232, 130, 94, 0.08);
}
.hero h1 { margin: 0 0 0.3rem; }
.hero .tagline { color: var(--text-dim); margin: 0; }

.contact-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin: 1rem 0;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

/* ── Cards & lists ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.3rem;
  margin: 1rem 0;
}
.card .title { color: var(--heading); font-weight: 600; }

ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean > li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}
ul.clean > li:last-child { border-bottom: none; }

.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: rgba(232, 130, 94, 0.1);
  border: 1px solid rgba(232, 130, 94, 0.3);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  margin-right: 0.5rem;
  white-space: nowrap;
}
.tag.blue {
  color: #f2998a;
  background: rgba(224, 82, 60, 0.1);
  border-color: rgba(224, 82, 60, 0.3);
}

.date {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ── Software entries ── */
.soft-item { display: flex; align-items: center; gap: 1.4rem; flex-wrap: wrap; }
.soft-item .soft-body { flex: 1; min-width: 260px; }
.soft-logo {
  width: 180px;
  height: auto;
  flex-shrink: 0;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--border);
  padding: 10px 12px;
}
.soft-links {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-left: 0.15rem;
  vertical-align: -3px;
}
.soft-links a {
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  transition: color 0.15s;
}
.soft-links a:hover { color: var(--accent); text-decoration: none; }
.soft-links svg { width: 15px; height: 15px; }
.soft-variants {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  margin-top: 0.75rem;
}
.soft-variants .variant {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 1rem 0.3rem 0.3rem;
}
.soft-variants .variant .tag { margin-right: 0; }
.soft-variants .variant .soft-links { margin-left: 0; gap: 0.8rem; vertical-align: 0; }

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s, color 0.15s;
}

/* Blog chapters */
.chapter-intro {
  max-width: 760px;
  margin: 0 0 2.25rem;
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.75;
}
.chapter-intro strong { color: var(--heading); }
.chapter-kicker {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}
.concept-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 1.4rem 0 2.3rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--border);
}
.concept-step {
  min-width: 0;
  padding: 1rem 1.05rem;
  background: var(--bg);
}
.concept-step .num {
  display: block;
  margin-bottom: 0.45rem;
  color: #7dabf8;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
}
.concept-step strong { display: block; color: var(--heading); font-size: 0.92rem; }
.concept-step span { display: block; margin-top: 0.28rem; color: var(--text-dim); font-size: 0.83rem; }
.math-note,
.result-note,
.reference-note {
  margin: 1.35rem 0 1.8rem;
  padding: 0.9rem 1rem;
  border-left: 3px solid #7dabf8;
  background: rgba(125, 171, 248, 0.07);
  color: var(--text-dim);
}
.result-note { border-left-color: #4fc596; background: rgba(79, 197, 150, 0.07); }
.reference-note { border-left-color: var(--accent); background: var(--accent-soft); }
.math-note strong,
.result-note strong,
.reference-note strong { color: var(--heading); }
.math-note p:last-child,
.result-note p:last-child,
.reference-note p:last-child { margin-bottom: 0; }
.series-nav a { white-space: nowrap; }

@media (max-width: 700px) {
  .concept-row { grid-template-columns: 1fr; }
  .chapter-intro { font-size: 1rem; }
}
.btn:hover { background: var(--accent); color: #2a160d; text-decoration: none; }
.btn.ghost { border-color: var(--border); color: var(--text-dim); }
.btn.ghost:hover { background: var(--bg-alt); color: var(--heading); }

/* ── CV specifics ── */
.cv-item { display: flex; gap: 1rem; justify-content: space-between; }
.cv-item .body { flex: 1; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 1.4rem 1.25rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  .nav-inner {
    padding: 0.75rem;
    gap: 0.65rem;
    flex-wrap: nowrap;
  }
  .nav-name { margin-right: auto; font-size: 0.95rem; white-space: nowrap; }
  nav a.nav-link { font-size: 0.8rem; }
  .hero { gap: 1.2rem; }
  .cv-item { flex-direction: column; gap: 0.15rem; }
}