/* Emmanuel Opoku — Portfolio */

:root {
  --bg: #0b1218;
  --bg-elevated: #121c26;
  --bg-bronze: #16130f;
  --bg-silver: #12171d;
  --bg-gold: #101820;
  --ink: #e8eef4;
  --ink-muted: #9aafc0;
  --teal: #2ec4b6;
  --teal-dim: #1a8f85;
  --cyan: #5eead4;
  --line: rgba(46, 196, 182, 0.22);
  --line-strong: rgba(46, 196, 182, 0.45);
  --bronze: #c4a574;
  --silver: #b8c5d0;
  --gold: #e0c56e;
  --danger: #f07178;
  --ok: #7fd99a;
  --font-display: "Syne", sans-serif;
  --font-body: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(46, 196, 182, 0.12), transparent 55%),
    radial-gradient(900px 500px at -10% 30%, rgba(94, 234, 212, 0.06), transparent 50%),
    linear-gradient(180deg, #0a1016 0%, var(--bg) 40%, #0d151c 100%);
  background-attachment: fixed;
}

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

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 100;
  padding: 0.5rem 0.9rem;
  background: var(--teal);
  color: #041210;
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* —— Nav —— */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(11, 18, 24, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}

.site-nav.is-scrolled {
  border-bottom-color: var(--line);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  z-index: 2;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 2;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.32rem;
}

.nav-toggle-bar {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

.site-nav.is-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(0.44rem) rotate(45deg);
}

.site-nav.is-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-nav.is-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-0.44rem) rotate(-45deg);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--cyan);
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    inset: 0 0 auto 0;
    top: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 4.75rem 1.25rem 1.5rem;
    background: rgba(11, 18, 24, 0.97);
    border-bottom: 1px solid var(--line);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.25s, visibility 0.35s;
  }

  .site-nav.is-open .nav-links {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links li {
    border-bottom: 1px solid var(--line);
  }

  .nav-links a {
    display: block;
    padding: 0.95rem 0.15rem;
    font-size: 0.95rem;
    color: var(--ink);
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
  padding: clamp(2rem, 6vw, 4rem) clamp(1rem, 4vw, 2.5rem) clamp(3rem, 8vw, 5rem);
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.flow-canvas {
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 18, 24, 0.92) 0%, rgba(11, 18, 24, 0.55) 48%, rgba(11, 18, 24, 0.35) 100%),
    linear-gradient(0deg, rgba(11, 18, 24, 0.95) 0%, transparent 42%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 38rem;
  animation: rise 1s var(--ease) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero-headline {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.hero-support {
  margin: 0 0 1.75rem;
  max-width: 32rem;
  color: var(--ink-muted);
  font-size: 1.08rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.85rem 1.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, color 0.25s;
}

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

.btn-primary {
  background: var(--teal);
  color: #041210;
}

.btn-primary:hover {
  background: var(--cyan);
  color: #041210;
}

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

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-small {
  padding: 0.55rem 0.95rem;
  font-size: 0.78rem;
}

/* —— Sections —— */
.section {
  padding: clamp(3.5rem, 9vw, 6.5rem) clamp(1rem, 4vw, 2.5rem);
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.section-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.45rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section-lead {
  margin: 0 0 2rem;
  max-width: 40rem;
  color: var(--ink-muted);
}

.section-about {
  background: linear-gradient(180deg, transparent, rgba(46, 196, 182, 0.03), transparent);
}

.section-approach {
  background: linear-gradient(180deg, transparent, rgba(94, 234, 212, 0.03), transparent);
}

.section-work {
  background: linear-gradient(180deg, transparent, rgba(46, 196, 182, 0.04), transparent);
}

.about-grid {
  display: grid;
  gap: 1.5rem 2.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .about-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.about-copy p {
  margin: 0 0 1rem;
  color: var(--ink-muted);
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.about-meta {
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-muted);
}

.about-meta strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.about-meta span {
  display: block;
  margin-bottom: 1rem;
}

.lanes {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .lanes {
    grid-template-columns: 1fr 1fr;
  }
}

.lane {
  padding: 0 0 1.25rem;
  border-bottom: 1px solid var(--line);
}

.lane h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
}

.lane p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
}

/* —— Case studies —— */
.case {
  margin-bottom: clamp(3rem, 8vw, 5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
}

.case:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.case-header {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 800px) {
  .case-header {
    grid-template-columns: 1fr auto;
    align-items: end;
  }
}

.case-kicker {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.case h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.case-outcome {
  margin: 0;
  max-width: 40rem;
  color: var(--ink-muted);
}

.case-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.stack li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  padding: 0.28rem 0.55rem;
  border: 1px solid var(--line);
}

/* —— Tableau —— */
.tableau-frame-wrap {
  position: relative;
  width: 100%;
  min-height: 620px;
  background:
    linear-gradient(135deg, rgba(46, 196, 182, 0.08), transparent 40%),
    var(--bg-elevated);
  border: 1px solid var(--line);
  overflow: hidden;
}

.tableau-frame-wrap iframe {
  width: 100%;
  height: 720px;
  border: 0;
  display: block;
  background: #0b1218;
}

.tableau-fallback {
  padding: 1.5rem;
  color: var(--ink-muted);
}

.tableau-fallback p {
  margin: 0 0 1rem;
}

/* —— Lakehouse walkthrough —— */
.pipeline {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.pipeline-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.pipeline-tab {
  appearance: none;
  margin: 0;
  padding: 1rem 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.pipeline-tab:last-child {
  border-right: 0;
}

.pipeline-tab:hover {
  color: var(--ink);
}

.pipeline-tab.is-active {
  color: #041210;
  background: var(--teal);
}

.pipeline-panel {
  display: none;
  padding: clamp(1.25rem, 3vw, 2rem);
  animation: fadePanel 0.45s var(--ease);
}

.pipeline-panel.is-active {
  display: block;
}

@keyframes fadePanel {
  from { opacity: 0; transform: translateY(0.4rem); }
  to { opacity: 1; transform: translateY(0); }
}

.pipeline-panel h4 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.pipeline-panel p {
  margin: 0 0 1rem;
  color: var(--ink-muted);
}

.pipeline-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-muted);
}

.pipeline-list li {
  margin-bottom: 0.35rem;
}

.pipeline-flow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.pipeline-flow .active-step {
  color: var(--cyan);
}

/* —— Diabetes predictor —— */
.predictor {
  display: grid;
  gap: 1.5rem;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: clamp(1.25rem, 3vw, 2rem);
}

@media (min-width: 860px) {
  .predictor {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
}

.predictor-form {
  display: grid;
  gap: 0.9rem;
}

.field label {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.field input,
.field select {
  width: 100%;
  padding: 0.7rem 0.8rem;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  background: #0a1117;
  border: 1px solid var(--line);
  outline: none;
}

.field input:focus,
.field select:focus {
  border-color: var(--teal);
}

.field-row {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr 1fr;
}

.predictor-note {
  margin: 0.25rem 0 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.predictor-result {
  padding: 1.25rem;
  border: 1px solid var(--line);
  min-height: 12rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  background:
    radial-gradient(400px 200px at 100% 0%, rgba(46, 196, 182, 0.1), transparent 60%),
    #0a1117;
}

.predictor-result[data-state="risk"] {
  border-color: rgba(240, 113, 120, 0.45);
}

.predictor-result[data-state="clear"] {
  border-color: rgba(127, 217, 154, 0.4);
}

.result-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.result-verdict {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.2;
}

.result-detail {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.result-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
}

/* —— Contact / footer —— */
.contact {
  border-top: 1px solid var(--line);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.contact-links a {
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}

.contact-links a:hover {
  color: var(--cyan);
}

.site-footer {
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 2.5rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

.site-footer .section-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

/* —— Reveal on scroll —— */
.reveal {
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-content,
  .reveal,
  .pipeline-panel {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}