/* ============================================
   Okwudili Onu — Portfolio
   Design: ledger/dashboard identity
   ============================================ */

:root {
  --ink: #12172B;
  --ink-soft: #4A5170;
  --ink-mute: #8890AA;
  --paper: #FFFFFF;
  --paper-soft: #F3F3F5;
  --line: rgba(18, 23, 43, 0.10);
  --line-dark: rgba(255, 255, 255, 0.12);
  --gold: #E8A33D;
  --gold-soft: #FBE6C4;
  --teal: #2FA88C;
  --teal-soft: #D9F0EA;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max-w: 1140px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  display: inline-block;
  margin-bottom: 0.75em;
}

/* ---------- Focus states ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  max-width: var(--max-w);
  margin: 0 auto;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
}

.nav-brand .credentials {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--gold);
  font-size: 0.8rem;
  margin-left: 6px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 4px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--gold);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 780px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.open {
    max-height: 400px;
  }
  .nav-links li {
    border-top: 1px solid var(--line);
  }
  .nav-links a {
    display: block;
    padding: 16px 28px;
  }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { background: var(--paper-soft); }
}

/* ---------- Ticker (signature element) ---------- */
.ticker {
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
  white-space: nowrap;
  border-bottom: 1px solid var(--line-dark);
}

.ticker-track {
  display: inline-flex;
  animation: ticker-scroll 38s linear infinite;
  padding: 10px 0;
}

.ticker:hover .ticker-track {
  animation-play-state: paused;
}

@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.ticker-item {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  padding: 0 28px;
  color: var(--paper);
  border-right: 1px solid var(--line-dark);
  flex-shrink: 0;
}

.ticker-item .figure {
  color: var(--gold);
  font-weight: 500;
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 56px;
  align-items: center;
}

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-portrait { order: -1; max-width: 220px; margin: 0 auto; }
}

.hero h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.2rem);
  margin-bottom: 0.3em;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink-soft);
  margin-bottom: 0.4em;
}

.hero-role .sep { color: var(--gold); margin: 0 8px; }

.hero-bio {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 1.2em 0 1.6em;
}

.hero-portrait {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 3/4;
}

.hero-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-cover {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  margin-top: 40px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { background: #232a48; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink); }

.btn-small {
  padding: 8px 16px;
  font-size: 0.82rem;
}

/* ---------- Social links ---------- */
.social-row {
  display: flex;
  gap: 14px;
  margin-top: 1.4em;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.social-icon:hover {
  border-color: var(--gold);
  background: var(--gold-soft);
}

.social-icon svg { width: 17px; height: 17px; }

/* ---------- Section shell ---------- */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--paper-soft);
}

.section-dark {
  background: var(--ink);
  color: var(--paper);
}

.section-dark .ink-soft-inv { color: rgba(255,255,255,0.65); }

.section-head {
  max-width: 60ch;
  margin-bottom: 44px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

/* ---------- Experience timeline ---------- */
.timeline {
  border-left: 2px solid var(--line);
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 2px var(--line);
}

.timeline-role {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-mute);
  margin-bottom: 2px;
}

.timeline-item h3 {
  font-size: 1.15rem;
  margin-bottom: 2px;
}

/* ---------- Testimonials ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

@media (max-width: 720px) {
  .testimonial-grid { grid-template-columns: 1fr; }
}

.testimonial {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}

.testimonial p {
  font-size: 0.98rem;
  color: var(--ink-soft);
}

.testimonial-name {
  font-family: var(--font-display);
  font-weight: 600;
  margin-top: 12px;
}

.testimonial-role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
}

/* ---------- Achievements list ---------- */
.achv-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.achv-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 16px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-dark);
}

.section:not(.section-dark) .achv-list li {
  border-bottom: 1px solid var(--line);
}

.achv-num {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 0.85rem;
  padding-top: 2px;
}

/* ---------- Cards grid (Products) ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

@media (max-width: 780px) {
  .card-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--paper-soft);
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-mute);
}

.card h3 {
  font-size: 1.08rem;
  margin-bottom: 6px;
}

.card p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  flex: 1;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.pill-live {
  background: var(--teal-soft);
  color: #1B6F5C;
}

.pill-internal {
  background: var(--paper-soft);
  color: var(--ink-mute);
  border: 1px solid var(--line);
}

.card-cta {
  margin-top: 14px;
}

/* ---------- Skills page ---------- */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.section-dark .chip {
  border-color: var(--line-dark);
  background: rgba(255,255,255,0.04);
  color: var(--paper);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cert-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.cert-item h3 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.cert-issuer {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-mute);
  text-align: right;
  white-space: nowrap;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

@media (max-width: 720px) {
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
}

.tool-tile {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 14px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: center;
  background: var(--paper);
}

.pub-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  align-items: center;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
}

@media (max-width: 640px) {
  .pub-card { grid-template-columns: 1fr; text-align: center; }
}

.pub-badge {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--gold-soft);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  flex-shrink: 0;
  margin: 0 auto;
}

/* ---------- Education / hobbies (About) ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
}

@media (max-width: 780px) {
  .two-col { grid-template-columns: 1fr; }
}

.edu-item h3 {
  font-size: 1.1rem;
  margin-bottom: 2px;
}

.edu-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gold);
  margin-bottom: 6px;
  display: block;
}

.hobby-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hobby-list li {
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.94rem;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
}

@media (max-width: 780px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-info-item {
  margin-bottom: 18px;
}

.contact-info-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
  display: block;
  margin-bottom: 4px;
}

.contact-info-value {
  font-size: 1.05rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 480px) {
  .form-row { grid-template-columns: 1fr; }
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  margin-bottom: 6px;
}

.field input,
.field textarea {
  width: 100%;
  padding: 13px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
}

.field textarea {
  min-height: 120px;
  resize: vertical;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--gold);
  outline: none;
}

.form-note {
  font-size: 0.82rem;
  color: var(--ink-mute);
  margin-top: 10px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 28px 0;
  font-size: 0.85rem;
  text-align: center;
}

.site-footer a { color: var(--gold); }