/* ==========================================================================
   Chidera Prince Eze — Portfolio
   Design concept: "Ledger" — the discipline of a spreadsheet meets the
   syntax of code. A dark, ink-and-brass editorial palette; a serif voice
   for conviction, a grid-lined system for evidence.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400;1,9..144,500&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #12141a;
  --bg-raised: #181b22;
  --bg-inset: #0e1015;
  --ink: #f2efe8;
  --ink-dim: #a9adb8;
  --ink-faint: #6e7280;
  --line: rgba(242, 239, 232, 0.11);
  --line-strong: rgba(242, 239, 232, 0.22);
  --accent: #e2a857;
  --accent-dim: #b98a48;
  --accent-wash: rgba(226, 168, 87, 0.1);
  --grid: rgba(226, 168, 87, 0.07);
  --serif: 'Fraunces', 'Iowan Old Style', ui-serif, Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --max: 1180px;
  --edge: clamp(1.25rem, 4vw, 4rem);
}

* { box-sizing: border-box; }
html { 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;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; margin: 0; color: var(--ink); }

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

section { position: relative; padding: clamp(4rem, 9vw, 7.5rem) 0; }

.section-head { max-width: 640px; margin-bottom: clamp(2.5rem, 6vw, 4rem); }
.section-kicker { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); letter-spacing: 0.02em; margin: 0 0 0.9rem; }
.section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); line-height: 1.2; letter-spacing: -0.01em; }
.section-head p { color: var(--ink-dim); font-size: 1.05rem; margin-top: 1rem; max-width: 54ch; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

a.skip-link {
  position: absolute; left: 1rem; top: -60px; background: var(--accent); color: #14151a;
  padding: 0.6rem 1rem; border-radius: 4px; z-index: 999; transition: top 0.2s ease;
  font-weight: 600;
}
a.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.5rem; border-radius: 2px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid transparent; transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn-primary { background: var(--accent); color: #16171d; }
.btn-primary:hover { background: #eebb78; transform: translateY(-2px); }
.btn-ghost { border-color: var(--line-strong); color: var(--accent-dim); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-text { color: var(--accent); font-weight: 600; border-bottom: 1px solid var(--accent-dim); padding: 0.15rem 0; border-radius: 0; }
.btn-text:hover { color: #eebb78; border-color: #eebb78; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, padding 0.3s ease;
  padding: 1.4rem 0;
}
.site-header.is-scrolled {
  background: rgba(18, 20, 26, 0.86);
  backdrop-filter: blur(10px);
  border-color: var(--line);
  padding: 0.85rem 0;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; }

.brand { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-family: var(--serif); font-size: 1.15rem; color: var(--ink); }
.brand-role { font-family: var(--mono); font-size: 0.68rem; color: var(--accent); letter-spacing: 0.01em; }

.nav-links { display: flex; align-items: center; gap: 2.1rem; }
.nav-links a { font-size: 0.92rem; color: var(--ink-dim); position: relative; padding: 0.3rem 0; }
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 0.2s ease;
}
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta { margin-left: 0.5rem; }

.nav-toggle { display: none; background: none; border: 1px solid var(--line-strong); color: var(--ink); width: 42px; height: 42px; border-radius: 2px; }

@media (max-width: 860px) {
  .nav-links { position: fixed; top: 0; right: 0; height: 100vh; width: min(78vw, 320px);
    background: var(--bg-raised); flex-direction: column; align-items: flex-start; justify-content: center;
    gap: 1.7rem; padding: 2rem var(--edge); transform: translateX(100%); transition: transform 0.3s ease;
    border-left: 1px solid var(--line);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-toggle { display: block; }
  .nav-cta { margin-left: 0; }
}

/* ---------- Hero ---------- */
.hero { padding-top: clamp(7rem, 16vw, 10rem); padding-bottom: clamp(3rem, 7vw, 5rem); overflow: hidden; }
.hero .container { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
@media (max-width: 900px) { .hero .container { grid-template-columns: 1fr; } }

.hero-eyebrow { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-dim); margin: 0 0 1.4rem; }
.hero-eyebrow strong { color: var(--accent); font-weight: 500; }

.hero h1 {
  font-size: clamp(2.3rem, 5.2vw, 3.7rem); line-height: 1.08; letter-spacing: -0.015em; font-weight: 400;
  max-width: 15ch;
}
.hero h1 em { font-style: italic; color: var(--accent); font-weight: 400; }

.hero-sub { color: var(--ink-dim); font-size: 1.1rem; max-width: 48ch; margin-top: 1.4rem; }

.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.1rem 1.6rem; margin-top: 2.3rem; }

.hero-fade { animation: rise 0.7s ease both; }
.hero-fade:nth-child(2) { animation-delay: 0.08s; }
.hero-fade:nth-child(3) { animation-delay: 0.16s; }
.hero-fade:nth-child(4) { animation-delay: 0.24s; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

/* hero visual: a code line + a data row, side by side, evidence not decoration */
.hero-panel {
  border: 1px solid var(--line); border-radius: 4px; background: var(--bg-inset);
  overflow: hidden; animation: rise 0.8s ease 0.15s both;
}
.hero-panel-row { display: flex; align-items: stretch; border-bottom: 1px solid var(--line); }
.hero-panel-row:last-child { border-bottom: none; }
.hero-panel-tag {
  flex: 0 0 84px; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 0.68rem; color: var(--ink-faint);
  border-right: 1px solid var(--line); background: rgba(255,255,255,0.015);
}
.hero-panel-body { flex: 1; padding: 0.95rem 1.15rem; font-family: var(--mono); font-size: 0.82rem; color: var(--ink-dim); }
.hero-panel-body .k { color: var(--accent); }
.hero-panel-body .s { color: #9fd3c7; }
.hero-panel-foot {
  display: flex; justify-content: space-between; padding: 0.85rem 1.15rem;
  font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); background: rgba(255,255,255,0.015);
}
.hero-panel-foot span:first-child { color: var(--accent); }

/* ---------- Metrics bar ---------- */
.metrics { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: clamp(2.2rem, 5vw, 3rem) 0; }
.metrics .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
@media (max-width: 760px) { .metrics .container { grid-template-columns: repeat(2, 1fr); } }
.metric { border-left: 1px solid var(--line); padding-left: 1.2rem; }
.metric-num { font-family: var(--serif); font-size: clamp(1.9rem, 3.4vw, 2.6rem); color: var(--ink); display: flex; align-items: baseline; gap: 0.15rem; }
.metric-num .suffix { color: var(--accent); font-size: 0.6em; }
.metric-label { color: var(--ink-dim); font-size: 0.88rem; margin-top: 0.35rem; }

/* ---------- About ---------- */
.about .container { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
@media (max-width: 900px) { .about .container { grid-template-columns: 1fr; } }
.about-lede { font-family: var(--serif); font-size: clamp(1.3rem, 2.4vw, 1.7rem); line-height: 1.4; color: var(--ink); }
.about-body p { color: var(--ink-dim); }
.about-body p + p { margin-top: 1.1rem; }
.about-list { list-style: none; padding: 0; margin: 1.6rem 0 0; display: grid; gap: 0.7rem; }
.about-list li { display: flex; gap: 0.7rem; color: var(--ink-dim); font-size: 0.95rem; }
.about-list li::before { content: "—"; color: var(--accent); flex-shrink: 0; }

/* ---------- What I do ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
@media (max-width: 820px) { .services-grid { grid-template-columns: 1fr; } }
.service { background: var(--bg); padding: 2.2rem; }
.service-index { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); }
.service h3 { font-size: 1.25rem; margin: 1rem 0 0.7rem; font-weight: 500; }
.service p { color: var(--ink-dim); font-size: 0.95rem; margin: 0; }

/* ---------- Projects ---------- */
.project {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center; padding: clamp(2.5rem, 5vw, 3.5rem) 0; border-top: 1px solid var(--line);
}
.project:last-child { border-bottom: 1px solid var(--line); }
.project:nth-child(even) .project-visual { order: 2; }
@media (max-width: 880px) { .project { grid-template-columns: 1fr; } .project:nth-child(even) .project-visual { order: 0; } }

.project-visual {
  aspect-ratio: 16/11; border-radius: 4px; border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--bg-raised), var(--bg-inset));
  position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center;
}
.project-visual::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 26px 26px;
}
.project-visual-label {
  position: relative; z-index: 1; text-align: center; padding: 1.5rem;
  font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint);
}
.project-visual-label .mark { font-family: var(--serif); font-style: italic; font-size: 1.3rem; color: var(--ink-dim); display: block; margin-bottom: 0.5rem; }

.project-industry { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); margin: 0 0 0.7rem; }
.project h3 { font-size: clamp(1.35rem, 2.2vw, 1.7rem); margin-bottom: 0.8rem; }
.project p.project-desc { color: var(--ink-dim); margin: 0 0 1.1rem; max-width: 50ch; }
.project-tech { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 1.1rem; padding: 0; list-style: none; }
.project-tech li { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-dim); border: 1px solid var(--line-strong); padding: 0.28rem 0.6rem; border-radius: 2px; }
.project-result { display: flex; gap: 0.6rem; align-items: baseline; color: var(--ink); font-size: 0.95rem; margin-bottom: 1.3rem; }
.project-result strong { font-family: var(--serif); color: var(--accent); font-size: 1.1rem; }
.project-actions { display: flex; gap: 1.4rem; align-items: center; flex-wrap: wrap; }

/* ---------- Build / Analyze split ---------- */
.split { background: var(--bg-raised); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.split-inner { display: grid; grid-template-columns: 1fr 1fr; }
@media (max-width: 780px) { .split-inner { grid-template-columns: 1fr; } }
.split-col { padding: clamp(2.5rem, 6vw, 4rem) var(--edge); }
.split-col + .split-col { border-left: 1px solid var(--line); }
@media (max-width: 780px) { .split-col + .split-col { border-left: none; border-top: 1px solid var(--line); } }
.split-col h3 { font-size: 1.7rem; margin-bottom: 1.4rem; }
.split-col.analyze h3 { color: var(--accent); }
.split-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.65rem; }
.split-col li { font-family: var(--mono); font-size: 0.92rem; color: var(--ink-dim); padding-left: 1.1rem; position: relative; }
.split-col li::before { content: "·"; position: absolute; left: 0; color: var(--accent); }
.split-note { max-width: var(--max); margin: 0 auto; padding: 1.6rem var(--edge); text-align: center; font-family: var(--serif); font-style: italic; color: var(--ink-dim); border-top: 1px solid var(--line); }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); }
@media (max-width: 720px) { .skills-grid { grid-template-columns: 1fr; } }
.skill-tier h3 { font-size: 1.1rem; color: var(--ink); margin-bottom: 1.1rem; padding-bottom: 0.8rem; border-bottom: 1px solid var(--line); }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; padding: 0; margin: 0; list-style: none; }
.skill-tags li { font-size: 0.9rem; color: var(--ink-dim); border: 1px solid var(--line-strong); padding: 0.45rem 0.85rem; border-radius: 20px; }
.skill-tier.advanced .skill-tags li { border-color: var(--accent-dim); color: var(--ink); }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 800px; }
.timeline::before { content: ""; position: absolute; top: 0.4rem; bottom: 0.4rem; left: 7px; width: 1px; background: var(--line-strong); }
.timeline-item { position: relative; padding-left: 2.4rem; padding-bottom: 2.4rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot { position: absolute; left: 0; top: 0.35rem; width: 15px; height: 15px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); }
.timeline-item.is-current .timeline-dot { background: var(--accent); }
.timeline-when { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); margin-bottom: 0.3rem; }
.timeline-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; cursor: pointer; border: none; background: none; width: 100%; text-align: left; padding: 0; color: inherit; }
.timeline-head h3 { font-size: 1.2rem; }
.timeline-head .co { color: var(--ink-dim); font-size: 0.95rem; font-family: var(--sans); display: block; margin-top: 0.2rem; }
.timeline-toggle { font-family: var(--mono); font-size: 1.1rem; color: var(--ink-faint); flex-shrink: 0; transition: transform 0.2s ease; }
.timeline-item[data-open="true"] .timeline-toggle { transform: rotate(45deg); color: var(--accent); }
.timeline-details { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.28s ease; }
.timeline-item[data-open="true"] .timeline-details { grid-template-rows: 1fr; }
.timeline-details-inner { overflow: hidden; }
.timeline-details ul { margin: 1rem 0 0; padding-left: 1.1rem; color: var(--ink-dim); display: grid; gap: 0.5rem; font-size: 0.95rem; }

/* ---------- Why hire me ---------- */
.reasons { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1.5rem; }
@media (max-width: 1000px) { .reasons { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .reasons { grid-template-columns: 1fr; } }
.reason { border-top: 2px solid var(--accent-dim); padding-top: 1.1rem; }
.reason h3 { font-size: 1.02rem; margin-bottom: 0.55rem; }
.reason p { color: var(--ink-dim); font-size: 0.9rem; margin: 0; }

/* ---------- Education ---------- */
.edu-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.edu-item { background: var(--bg); padding: 1.4rem 1.7rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; align-items: baseline; }
.edu-item h3 { font-size: 1.05rem; font-weight: 500; }
.edu-item span { color: var(--ink-dim); font-size: 0.9rem; }
.edu-item .edu-org { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }

/* ---------- Contact ---------- */
.contact { background: var(--bg-raised); border-top: 1px solid var(--line); }
.contact .container { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(2.5rem, 6vw, 5rem); }
@media (max-width: 900px) { .contact .container { grid-template-columns: 1fr; } }
.contact h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); line-height: 1.25; max-width: 16ch; }
.contact-details { margin-top: 2rem; display: grid; gap: 1rem; }
.contact-details a, .contact-details span { color: var(--ink-dim); font-size: 0.98rem; display: flex; gap: 0.7rem; }
.contact-details a:hover { color: var(--accent); }
.contact-details .label { font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); min-width: 90px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
@media (max-width: 540px) { .form-row { grid-template-columns: 1fr; } }
.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: 0.85rem; color: var(--ink-dim); margin-bottom: 0.45rem; }
.field input, .field textarea {
  width: 100%; background: var(--bg-inset); border: 1px solid var(--line-strong); color: var(--ink);
  padding: 0.8rem 0.9rem; border-radius: 3px; font-family: var(--sans); font-size: 0.95rem; transition: border-color 0.2s ease;
}
.field input:focus, .field textarea:focus { border-color: var(--accent); outline: none; }
.field textarea { resize: vertical; min-height: 120px; }
.field-error { color: #e57a7a; font-size: 0.8rem; margin-top: 0.4rem; display: none; }
.field.has-error input, .field.has-error textarea { border-color: #e57a7a; }
.field.has-error .field-error { display: block; }
.hp-field { position: absolute; left: -9999px; }

.form-status { margin-top: 1rem; font-size: 0.92rem; padding: 0.9rem 1rem; border-radius: 3px; display: none; }
.form-status.is-visible { display: block; }
.form-status.success { background: rgba(159, 211, 199, 0.12); color: #9fd3c7; }
.form-status.error { background: rgba(229, 122, 122, 0.12); color: #e57a7a; }

/* ---------- Footer ---------- */
.site-footer { padding: 3rem 0; }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; align-items: center; border-top: 1px solid var(--line); padding-top: 2rem; }
.footer-brand { font-family: var(--serif); font-size: 1.05rem; }
.footer-role { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); margin-top: 0.3rem; }
.footer-nav { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.footer-nav a { color: var(--ink-dim); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--accent); }
.footer-copy { color: var(--ink-faint); font-size: 0.82rem; width: 100%; margin-top: 1rem; }

/* ---------- Case study modal ---------- */
dialog#caseModal {
  border: 1px solid var(--line-strong); border-radius: 6px; padding: 0; color: var(--ink);
  background: var(--bg-raised); width: min(720px, 92vw); max-height: 86vh; overflow-y: auto;
}
dialog#caseModal::backdrop { background: rgba(10, 11, 14, 0.7); backdrop-filter: blur(2px); }
.case-study { padding: clamp(1.75rem, 4vw, 2.75rem); }
.case-study-close {
  position: sticky; top: 0; float: right; background: var(--bg-inset); border: 1px solid var(--line-strong);
  color: var(--ink-dim); width: 34px; height: 34px; border-radius: 50%; font-size: 1.1rem; line-height: 1;
}
.case-study-close:hover { color: var(--accent); border-color: var(--accent); }
.case-study-industry { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); margin: 0 0 0.5rem; }
.case-study h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 1.6rem; clear: both; }
.case-study h4 { font-size: 0.85rem; text-transform: none; color: var(--ink-dim); margin: 1.5rem 0 0.5rem; font-family: var(--mono); }
.case-study h4:first-of-type { margin-top: 0; }
.case-study p, .case-study li { color: var(--ink); font-size: 0.97rem; }
.case-study ul { margin: 0; padding-left: 1.2rem; }
.case-study .case-tech { display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 0; list-style: none; }
.case-study .case-tech li { font-family: var(--mono); font-size: 0.72rem; border: 1px solid var(--line-strong); padding: 0.28rem 0.6rem; border-radius: 2px; }
.case-study-cta { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }

/* ---------- Scroll reveal (single, restrained treatment) ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}