/* =========================================================
   Wisdom Ogebe — Portfolio
   Design tokens
   ========================================================= */
:root {
  /* Color */
  --ink: #10141c;
  --ink-soft: #171d28;
  --ink-line: #2a3142;
  --paper: #f3f4f1;
  --paper-raised: #ffffff;
  --line: #dcded8;
  --slate: #2b2f38;
  --slate-soft: #5b616c;
  --signal: #2f5fed;
  --signal-dim: #e8edfe;
  --signal-ink: #1c3aa8;
  --active: #1f9d63;

  /* Type */
  --font-display: "Archivo", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* Scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --radius: 10px;
  --max: 1180px;
}

/* =========================================================
   Reset
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--slate);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; margin: 0; color: var(--ink); }
p { margin: 0 0 var(--space-2); }
ul { margin: 0; padding: 0; }
li { list-style: none; }

/* Focus visibility — never remove without replacing */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--ink);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 1000;
  border-radius: 0 0 8px 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.skip-link:focus {
  left: 0;
  top: 0;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--signal-ink);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  margin-bottom: var(--space-2);
}
.eyebrow::before {
  content: "";
  width: 0.5em;
  height: 0.5em;
  background: var(--signal);
  border-radius: 50%;
  display: inline-block;
}

section { padding: var(--space-6) 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }

h2.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: var(--space-1);
}
.section-lede {
  color: var(--slate-soft);
  max-width: 60ch;
  margin-bottom: var(--space-4);
}

/* =========================================================
   Header / Nav
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(243, 244, 241, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--space-3);
  max-width: var(--max);
  margin: 0 auto;
}
.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.brand span { color: var(--signal); }

.nav-links {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}
.nav-links a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate);
  padding: 0.4rem 0.1rem;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a:focus-visible { border-bottom-color: var(--signal); color: var(--ink); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--ink);
  color: #fff !important;
  padding: 0.55rem 0.9rem;
  border-radius: 6px;
  text-decoration: none;
  border-bottom: none !important;
}
.nav-cta:hover { background: var(--signal); }

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--ink);
}

@media (max-width: 780px) {
  .menu-toggle { display: inline-flex; align-items: center; gap: 0.4em; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--space-3) 1rem;
  }
  .nav-links[data-open="false"] { display: none; }
  .nav-links a { padding: 0.75rem 0.2rem; border-bottom: 1px solid var(--line); }
  .nav-cta { display: inline-block; margin-top: 0.5rem; text-align: center; }
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  background:
    linear-gradient(180deg, rgba(16,20,28,0.94), rgba(16,20,28,0.985) 60%, var(--ink) 100%),
    repeating-linear-gradient(0deg, rgba(143,166,255,0.06) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(90deg, rgba(143,166,255,0.06) 0 1px, transparent 1px 88px),
    var(--ink);
  color: #e8e9ee;
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: 1px solid var(--ink-line);
  position: relative;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-5);
  align-items: center;
}
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; }
}

.hero-id {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: var(--space-3);
}
.hero-photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(143, 166, 255, 0.4);
  outline: 1px solid rgba(0,0,0,0.2);
  outline-offset: -3px;
  flex-shrink: 0;
  background: var(--ink-soft);
}
.hero-id-text .name-line {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #a9c0ff;
  letter-spacing: 0.03em;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: #8fa6ff;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin-bottom: var(--space-2);
}
.status-dot {
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--active);
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(31, 157, 99, 0.25);
}

.hero h1 {
  color: #fff;
  font-size: clamp(2.3rem, 5vw, 3.4rem);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.hero .role {
  font-family: var(--font-display);
  font-weight: 600;
  color: #a9c0ff;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  margin-bottom: var(--space-3);
}
.hero p.lede {
  font-size: 1.08rem;
  color: #c3c6d4;
  max-width: 52ch;
  margin-bottom: var(--space-4);
}

.cta-row { display: flex; gap: 0.9rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.8rem 1.3rem;
  border-radius: 8px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--signal); color: #fff; }
.btn-primary:hover, .btn-primary:focus-visible { background: #4576ff; }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn-outline:hover, .btn-outline:focus-visible { border-color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--signal); color: var(--signal-ink); }

/* Signature element: profile "API response" card */
.profile-card {
  background: #0b0e14;
  border: 1px solid var(--ink-line);
  border-radius: 12px;
  padding: 1.4rem 1.4rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
.profile-card .card-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #7d8aa8;
  font-size: 0.72rem;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}
.profile-card .method { color: var(--active); }
.profile-card pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: #d6d9e6;
}
.profile-card .k { color: #8fa6ff; }
.profile-card .s { color: #f2c94c; }
.profile-card .n { color: #7ee7c7; }

/* =========================================================
   About
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }
.about-copy p { font-size: 1.05rem; max-width: 62ch; }
.fact-list {
  border-top: 1px solid var(--line);
}
.fact-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}
.fact-list dt, .fact-k { font-family: var(--font-mono); color: var(--slate-soft); }
.fact-v { text-align: right; font-weight: 600; color: var(--ink); }

/* =========================================================
   Skills
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--space-3);
}
.skill-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
}
.skill-card h3 {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal-ink);
  margin-bottom: 0.9rem;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  font-size: 0.83rem;
  padding: 0.35rem 0.65rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--slate);
}

/* =========================================================
   Experience
   ========================================================= */
.timeline { border-top: 1px solid var(--line); }
.timeline-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 700px) {
  .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; }
}
.timeline-item .dates {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--slate-soft);
  padding-top: 0.2rem;
}
.timeline-item.featured {
  background: var(--signal-dim);
  margin: 0 calc(-1 * var(--space-3));
  padding-left: var(--space-3);
  padding-right: var(--space-3);
  border-radius: var(--radius);
  border-bottom: none;
}
.timeline-item.featured .dates { color: var(--signal-ink); }
.role-title { font-size: 1.15rem; margin-bottom: 0.15rem; }
.role-org { color: var(--slate-soft); font-weight: 600; margin-bottom: 0.8rem; }
.role-list { display: grid; gap: 0.4rem; }
.role-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.96rem;
}
.role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  background: var(--signal);
  border-radius: 50%;
}
.role-tech {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--slate-soft);
}

/* =========================================================
   Projects
   ========================================================= */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-3);
}
.project-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.project-card:hover, .project-card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(16, 20, 28, 0.1);
  border-color: var(--signal);
}
@media (prefers-reduced-motion: reduce) {
  .project-card:hover, .project-card:focus-within { transform: none; }
}

.ensemble-diagram {
  margin: 0.3rem 0 1.1rem;
  padding: 1rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--ink-line);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #9aa3b8;
  overflow-x: auto;
}
.ensemble-diagram .flow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.ensemble-diagram .node {
  border: 1px solid rgba(143,166,255,0.35);
  color: #d6d9e6;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  white-space: nowrap;
}
.ensemble-diagram .node.accent { border-color: var(--active); color: #7ee7c7; }
.ensemble-diagram .arrow { color: #5b617a; }
.ensemble-diagram .stack { display: flex; flex-direction: column; gap: 0.3rem; }
.project-card.flagship {
  grid-column: 1 / -1;
  background: var(--ink);
  color: #dfe1e8;
  border-color: var(--ink-line);
}
.project-card.flagship h3, .project-card.flagship .pill { color: #fff; }
.project-card.flagship .project-desc dt { color: #8fa6ff; }
.project-card.flagship .project-desc dd { color: #c3c6d4; }
.project-card.flagship .tag { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.16); color: #dfe1e8; }
.project-card.flagship .project-links a.btn-ghost { color: #fff; border-color: rgba(255,255,255,0.3); }

.pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal-ink);
  margin-bottom: 0.6rem;
}
.project-card h3 { font-size: 1.25rem; margin-bottom: 0.6rem; }
.project-desc { margin: 0 0 var(--space-2); display: grid; gap: 0.55rem; }
.project-desc div { display: grid; grid-template-columns: 90px 1fr; gap: 0.6rem; font-size: 0.92rem; }
.project-desc dt { font-family: var(--font-mono); font-size: 0.75rem; color: var(--slate-soft); text-transform: uppercase; letter-spacing: 0.05em; padding-top: 0.1rem; }
.project-desc dd { margin: 0; }
.project-card .tag-row { margin-bottom: var(--space-2); }
.project-links { display: flex; gap: 0.7rem; margin-top: auto; flex-wrap: wrap; }
.project-links a { font-size: 0.88rem; padding: 0.55rem 1rem; }

/* =========================================================
   Certifications
   ========================================================= */
.cert-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.9rem;
}
.cert-item {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.cert-item a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  text-decoration: none;
}
.cert-item:has(a):hover, .cert-item:has(a):focus-within { border-color: var(--signal); background: var(--signal-dim); }
.cert-item > span { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.cert-name { font-weight: 600; color: var(--ink); font-size: 0.95rem; }
.cert-issuer { display: block; font-size: 0.82rem; color: var(--slate-soft); margin-top: 0.15rem; }

/* =========================================================
   Education
   ========================================================= */
.edu-card {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: var(--space-3);
  max-width: 640px;
}
.edu-card h3 { font-size: 1.15rem; margin-bottom: 0.2rem; }
.edu-meta { color: var(--slate-soft); font-size: 0.92rem; margin-bottom: 0.9rem; }
.thesis {
  border-top: 1px dashed var(--line);
  padding-top: 0.9rem;
  font-size: 0.92rem;
}
.thesis dt { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--slate-soft); margin-bottom: 0.3rem; }
.thesis dd { margin: 0; font-style: italic; color: var(--slate); }

/* =========================================================
   Contact
   ========================================================= */
.contact-section {
  background: var(--ink);
  color: #e8e9ee;
  border-bottom: none;
}
.contact-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-4);
}
.contact-section h2 { color: #fff; font-size: clamp(1.8rem, 3.5vw, 2.5rem); max-width: 18ch; }
.contact-section .eyebrow { color: #8fa6ff; }
.contact-links { display: grid; gap: 0.9rem; }
.contact-links a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: #dfe1e8;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--ink-line);
}
.contact-links a:hover, .contact-links a:focus-visible { color: #fff; border-bottom-color: var(--signal); }
.contact-links .k { color: #7d8aa8; min-width: 6.5em; display: inline-block; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--ink);
  color: #7d8aa8;
  padding: var(--space-3) 0 var(--space-4);
  font-size: 0.85rem;
  border-top: 1px solid var(--ink-line);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-inner a { color: #a9c0ff; text-decoration: none; }
.footer-inner a:hover { text-decoration: underline; }

/* =========================================================
   404 page
   ========================================================= */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}
.error-page .code {
  font-family: var(--font-mono);
  color: var(--signal-ink);
  font-size: 1rem;
  margin-bottom: 0.8rem;
}