/* ============================================================
   Nana Appiah — Portfolio
   Dark, editorial, infrastructure-grade.
   ============================================================ */

:root {
  --bg: #0b0f17;
  --bg-soft: #0e1420;
  --bg-card: #111927;
  --bg-card-hover: #152032;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.28);
  --text: #e8edf5;
  --text-dim: #9aa7bd;
  --text-faint: #64748b;
  --accent: #34d399;
  --accent-dim: rgba(52, 211, 153, 0.12);
  --accent-glow: rgba(52, 211, 153, 0.18);
  --amber: #fbbf24;
  --radius: 14px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --nav-h: 68px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #06281c; }

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

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.45em;
  color: #c9f5e2;
  white-space: nowrap;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #06281c;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 200; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; height: var(--nav-h); z-index: 100;
  background: rgba(11, 15, 23, 0.78);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; height: 100%; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent-dim); border: 1px solid rgba(52, 211, 153, 0.35);
  color: var(--accent); font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  display: grid; place-items: center;
}
.brand-name { letter-spacing: -0.01em; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--text-dim); font-size: 14.5px; font-weight: 500; position: relative; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px;
  background: var(--accent); border-radius: 2px;
}
.nav-cta {
  border: 1px solid rgba(52, 211, 153, 0.45); border-radius: 999px;
  padding: 8px 18px !important; color: var(--accent) !important;
}
.nav-cta:hover { background: var(--accent-dim); }
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 8px;
}
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.mobile-menu { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 96px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, black 30%, transparent 75%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(110px); opacity: 0.55; }
.hero-glow-a { width: 520px; height: 520px; left: -140px; top: -120px; background: var(--accent-glow); }
.hero-glow-b { width: 420px; height: 420px; right: -100px; bottom: -80px; background: rgba(56, 130, 246, 0.10); }
.hero-inner { position: relative; z-index: 1; max-width: 1080px; margin: 0 auto; padding: 0 24px; width: 100%; }

.hero-kicker {
  font-family: var(--font-mono); font-size: 13.5px; color: var(--accent);
  display: flex; align-items: center; gap: 10px; margin-bottom: 22px;
}
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); position: relative; }
.pulse-dot::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%;
  border: 1px solid var(--accent); animation: pulse 2s ease-out infinite;
}
@keyframes pulse { 0% { transform: scale(0.6); opacity: 1; } 100% { transform: scale(1.5); opacity: 0; } }

.hero-title {
  font-size: clamp(3rem, 8.5vw, 5.6rem);
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.02; margin-bottom: 14px;
  background: linear-gradient(180deg, #fff 30%, #aeb9cf 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: clamp(1.15rem, 2.6vw, 1.6rem); font-weight: 600; color: var(--accent);
  letter-spacing: -0.01em; margin-bottom: 20px;
}
.hero-lede { max-width: 640px; color: var(--text-dim); font-size: 1.08rem; margin-bottom: 36px; }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 30px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; font-family: var(--font-sans);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #06281c; box-shadow: 0 8px 28px rgba(52, 211, 153, 0.28); }
.btn-primary:hover { box-shadow: 0 12px 34px rgba(52, 211, 153, 0.38); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); background: rgba(148, 163, 184, 0.06); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-social { display: flex; gap: 10px; }
.hero-social a {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  border: 1px solid var(--border); color: var(--text-dim);
  background: rgba(148, 163, 184, 0.05); transition: 0.2s;
}
.hero-social a:hover { color: var(--accent); border-color: rgba(52, 211, 153, 0.45); transform: translateY(-2px); text-decoration: none; }
.hero-social svg { width: 20px; height: 20px; }

.scroll-hint { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); opacity: 0.6; }
.scroll-hint span {
  display: block; width: 24px; height: 38px; border: 2px solid var(--text-faint); border-radius: 14px; position: relative;
}
.scroll-hint span::after {
  content: ""; position: absolute; left: 50%; top: 7px; width: 4px; height: 8px;
  margin-left: -2px; border-radius: 4px; background: var(--accent); animation: wheel 1.8s ease-in-out infinite;
}
@keyframes wheel { 0%, 100% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(10px); opacity: 0.3; } }

/* ---------- Metrics ---------- */
.metrics { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.metrics-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border);
}
.metric {
  background: var(--bg-soft); padding: 30px 26px;
  display: flex; flex-direction: column; gap: 8px;
  transition: background 0.25s;
}
.metric:hover { background: var(--bg-card); }
.metric-value {
  font-size: 2rem; font-weight: 800; letter-spacing: -0.03em; color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.metric-label { font-size: 13.5px; color: var(--text-dim); line-height: 1.5; }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section-alt { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 52px; }
.section-index {
  font-family: var(--font-mono); font-size: 14px; color: var(--accent);
  border: 1px solid rgba(52, 211, 153, 0.35); border-radius: 8px; padding: 3px 10px;
  background: var(--accent-dim);
}
.section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); font-weight: 800; letter-spacing: -0.025em; }
.lead { font-size: 1.15rem; color: var(--text); font-weight: 500; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 44px; align-items: start; }
.about-copy p { color: var(--text-dim); margin-bottom: 18px; }
.about-copy .lead { color: var(--text); }
.about-facts { display: grid; gap: 12px; margin-top: 30px; }
.fact {
  display: grid; grid-template-columns: 110px 1fr; gap: 14px; align-items: baseline;
  padding: 14px 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14.5px;
}
.fact-label { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.about-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; position: sticky; top: calc(var(--nav-h) + 24px);
}
.about-card h3 { font-size: 1.05rem; margin-bottom: 18px; letter-spacing: -0.01em; }
.about-card ul { list-style: none; display: grid; gap: 12px; }
.about-card li { color: var(--text-dim); font-size: 14.5px; display: flex; gap: 10px; }
.tick { color: var(--accent); font-family: var(--font-mono); }

/* ---------- Experience ---------- */
.timeline { display: grid; gap: 26px; position: relative; }
.job {
  display: grid; grid-template-columns: 210px 1fr; gap: 30px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px; transition: border-color 0.25s, transform 0.25s;
}
.job:hover { border-color: var(--border-strong); }
.job-meta { display: flex; flex-direction: column; gap: 6px; }
.job-dates { font-family: var(--font-mono); font-size: 13px; color: var(--accent); font-weight: 600; }
.job-location { font-size: 13px; color: var(--text-faint); }
.job-body h3 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.015em; margin-bottom: 4px; }
.job-company { color: var(--text-dim); font-size: 14.5px; margin-bottom: 20px; font-weight: 500; }
.job-client { color: var(--text-faint); font-weight: 400; }
.job-body ul { list-style: none; display: grid; gap: 13px; }
.job-body li { color: var(--text-dim); font-size: 14.8px; padding-left: 22px; position: relative; line-height: 1.6; }
.job-body li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); font-family: var(--font-mono); }
.job-body li strong { color: var(--text); font-weight: 600; }

/* ---------- Projects ---------- */
.project {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px; transition: border-color 0.25s, transform 0.25s;
}
.project:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.project-featured {
  border: 1px solid rgba(52, 211, 153, 0.35);
  background: linear-gradient(160deg, rgba(52, 211, 153, 0.07), var(--bg-card) 45%);
  margin-bottom: 26px;
}
.project-top { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.project-badge {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: 0.04em;
  color: var(--accent); background: var(--accent-dim);
  border: 1px solid rgba(52, 211, 153, 0.35); border-radius: 999px; padding: 5px 14px;
}
.project-badge-alt { color: var(--amber); background: rgba(251, 191, 36, 0.09); border-color: rgba(251, 191, 36, 0.35); }
.project-links { display: flex; gap: 18px; font-size: 14px; font-weight: 600; }
.project h3 { font-size: 1.5rem; font-weight: 750; letter-spacing: -0.02em; margin-bottom: 12px; }
.project > p { color: var(--text-dim); margin-bottom: 18px; max-width: 720px; }
.project-points { list-style: none; display: grid; gap: 9px; margin-bottom: 22px; }
.project-points li { color: var(--text-dim); font-size: 14.8px; padding-left: 22px; position: relative; }
.project-points li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); font-family: var(--font-mono); }
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.project-grid .project h3 { font-size: 1.25rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 8px; padding: 5px 11px;
  background: rgba(148, 163, 184, 0.06); white-space: nowrap;
}
.tag-sub { color: var(--text-faint); }
.tag-familiar { border-style: dashed; color: var(--text-faint); }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.skill-group {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: border-color 0.25s;
}
.skill-group:hover { border-color: var(--border-strong); }
.skill-group h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.01em; color: var(--text); }

/* ---------- Testimonials ---------- */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.testimonial {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; display: flex; flex-direction: column; gap: 20px;
  transition: border-color 0.25s, transform 0.25s;
}
.testimonial:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.testimonial blockquote {
  font-size: 14.8px; color: var(--text-dim); line-height: 1.7; flex: 1;
  quotes: "“" "”";
}
.testimonial blockquote::before { content: open-quote; color: var(--accent); font-size: 1.6em; line-height: 0; margin-right: 2px; vertical-align: -0.25em; }
.testimonial figcaption { font-size: 14px; font-weight: 600; color: var(--text); }
.testimonial figcaption span { display: block; font-weight: 400; color: var(--text-faint); font-size: 13px; margin-top: 2px; }

/* ---------- Contact ---------- */
.contact-inner { max-width: 640px; }
.contact-inner .lead { margin-bottom: 28px; }
.contact-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.contact-links { display: flex; gap: 24px; font-weight: 600; font-size: 15px; margin-bottom: 26px; }
.contact-note { color: var(--text-faint); font-size: 14px; font-family: var(--font-mono); }

/* ---------- Writing ---------- */
.section-sub { color: var(--text-dim); margin: -34px 0 40px; max-width: 640px; }
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-bottom: 38px; }
.article-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: border-color 0.25s, transform 0.25s;
}
.article-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.article-img { display: block; aspect-ratio: 16/9; overflow: hidden; background: #0d1420; }
.article-img img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.4s ease; }
.article-card:hover .article-img img { transform: scale(1.04); }
.article-img-fallback {
  background:
    radial-gradient(ellipse 80% 90% at 20% 10%, rgba(52, 211, 153, 0.22), transparent 60%),
    radial-gradient(ellipse 70% 80% at 85% 90%, rgba(56, 130, 246, 0.16), transparent 60%),
    #0d1420;
}
.article-body { padding: 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.article-date {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.article-body h3 { font-size: 1.04rem; font-weight: 700; letter-spacing: -0.01em; line-height: 1.42; }
.article-body h3 a { color: var(--text); }
.article-body h3 a:hover { color: var(--accent); text-decoration: none; }
.article-body p { color: var(--text-dim); font-size: 14px; line-height: 1.6; flex: 1; }
.article-link { font-size: 13.5px; font-weight: 600; }
.writing-more { text-align: left; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 28px 0; background: var(--bg); }
.footer-inner {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  color: var(--text-faint); font-size: 13.5px; flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-card { position: static; }
  .job { grid-template-columns: 1fr; gap: 18px; padding: 28px; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 76px 0; }
  .nav-links { display: none; }
  .menu-toggle { display: flex; }
  .mobile-menu {
    display: flex; flex-direction: column; gap: 4px;
    background: rgba(11, 15, 23, 0.98); border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px; max-height: 0; overflow: hidden; padding-top: 0; padding-bottom: 0;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }
  .mobile-menu.open { max-height: 420px; padding: 12px 24px 20px; }
  .mobile-menu a { color: var(--text-dim); font-weight: 500; padding: 10px 0; border-bottom: 1px solid var(--border); }
  .mobile-menu a:last-child { border-bottom: none; }
  .mobile-menu a:hover { color: var(--accent); text-decoration: none; }
  .skills-grid { grid-template-columns: 1fr; }
  .metric-value { font-size: 1.7rem; }
  .fact { grid-template-columns: 1fr; gap: 4px; }
  .hero-actions .btn { flex: 1; text-align: center; }
}