/* ============================================================
   Eugene Nnamdi — Portfolio
   Design System & Styles
   ============================================================ */

:root {
  /* Palette */
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-hover: rgba(0, 0, 0, 0.018);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.14);
  --border-strong: rgba(0, 0, 0, 0.22);

  --text: #111111;
  --text-secondary: rgba(17, 17, 17, 0.50);
  --text-tertiary: rgba(17, 17, 17, 0.26);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03), 0 1px 3px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.04), 0 4px 14px rgba(0, 0, 0, 0.025);

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Spacing */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 28px;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur-normal: 250ms;
  --dur-slow: 400ms;
}

[data-theme="dark"] {
  --bg: #111111;
  --surface: #111111;
  --surface-hover: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(255, 255, 255, 0.20);
  --border-strong: rgba(255, 255, 255, 0.30);

  --text: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.60);
  --text-tertiary: rgba(255, 255, 255, 0.35);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: var(--fw-normal);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { border: 0; background: transparent; cursor: pointer; color: inherit; font: inherit; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ============================================================
   PAGE SHELL — single viewport layout
   ============================================================ */
.page-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: clamp(20px, 3vw, 40px) clamp(20px, 5vw, 72px);
  max-width: 1320px;
  margin: 0 auto;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-xl);
}

.identity {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* --- Name --- */
h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: var(--fw-extrabold);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text);
  white-space: nowrap;
}

/* --- Role rotator (typewriter) --- */
.role-rotator {
  display: flex;
  align-items: center;
  gap: 1px;
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 1.3vw, 0.95rem);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  min-height: 1.6em;
}

.role-text {
  display: inline-block;
}

.role-cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--text-tertiary);
  margin-left: 1px;
  animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 28px);
  padding-top: 6px;
  flex-shrink: 0;
}

.nav-link,
.contact-toggle {
  position: relative;
  font-size: clamp(0.86rem, 1.1vw, 0.96rem);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
  color: var(--text-secondary);
  padding: var(--space-xs) 0;
  transition: color var(--dur-normal) var(--ease-out);
}

.nav-link::after,
.contact-toggle::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1.5px;
  background: var(--text);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-normal) var(--ease-out);
}

.nav-link:hover,
.nav-link:focus-visible,
.contact-toggle:hover,
.contact-toggle:focus-visible {
  color: var(--text);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.contact-toggle:hover::after,
.contact-toggle:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* --- Theme Toggle --- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: color var(--dur-normal), background var(--dur-normal);
  background: transparent;
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--surface-hover);
}

[data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block !important; }
[data-theme="light"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: none; }

/* --- Contact dropdown --- */
.contact-menu {
  position: relative;
}

.contact-toggle {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  cursor: pointer;
}

.contact-toggle > span {
  display: inline-block;
  width: 7px; height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform var(--dur-normal) var(--ease-out);
}

.contact-menu.is-open .contact-toggle > span {
  transform: translateY(2px) rotate(-135deg);
}

.contact-panel {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  display: flex;
  gap: 12px;
  align-items: center;
  min-width: max-content;
  padding: 4px 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity var(--dur-fast) ease, transform var(--dur-normal) var(--ease-out);
  visibility: hidden;
}

.contact-menu.is-open .contact-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  visibility: visible;
}

.social-link {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  transition: color var(--dur-normal) var(--ease-out),
              background var(--dur-normal) var(--ease-out),
              transform var(--dur-fast) var(--ease-spring);
}

.social-link svg { width: 18px; height: 18px; fill: currentColor; }

.social-link:hover,
.social-link:focus-visible {
  color: var(--text);
  background: rgba(0, 0, 0, 0.05);
  transform: translateY(-1px);
}

/* ============================================================
   MAIN — compact, fills viewport
   ============================================================ */
.home {
  flex: 1;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding-top: clamp(28px, 5vh, 56px);
  padding-bottom: clamp(16px, 2vh, 28px);
  align-content: start;
}

/* ============================================================
   CONTENT BLOCKS
   ============================================================ */
.content-block {
  position: relative;
  width: 100%;
  max-width: 1100px;
  justify-self: center;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--dur-normal) var(--ease-out),
              border-color var(--dur-normal) var(--ease-out);
}

.content-block:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

/* ============================================================
   WORK SECTION — collapsible rows
   ============================================================ */
.work-block { display: grid; gap: 0; }

.work-heading {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border);
}

.section-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
}

.section-label span { color: var(--text-tertiary); }

/* --- Work row (details element) --- */
.work-row {
  border-bottom: 1px solid var(--border);
}

.work-row:last-child { border-bottom: 0; }

/* --- Summary (collapsed view) --- */
.work-summary {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  cursor: pointer;
  list-style: none;
  transition: background var(--dur-normal) var(--ease-out);
  user-select: none;
}

.work-summary::-webkit-details-marker { display: none; }
.work-summary::marker { display: none; content: ''; }

.work-summary:hover { background: var(--surface-hover); }

.work-date {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  min-width: 140px;
  flex-shrink: 0;
}

.work-info {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text);
  min-width: 0;
}

.work-info strong { font-weight: var(--fw-semibold); }

.work-info a {
  color: var(--text-secondary);
  font-weight: var(--fw-normal);
  transition: color var(--dur-fast) var(--ease-out);
}

.work-info a:hover { color: var(--text); }

/* Toggle icon (+/–) */
.work-toggle {
  position: relative;
  width: 16px; height: 16px;
  flex-shrink: 0;
  color: var(--text-tertiary);
  transition: color var(--dur-normal) var(--ease-out);
}

.work-toggle::before,
.work-toggle::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 10px; height: 1.5px;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform var(--dur-normal) var(--ease-out);
}

.work-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

details[open] .work-toggle::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

details[open] .work-toggle { color: var(--text-secondary); }

.work-summary:hover .work-toggle { color: var(--text-secondary); }

/* --- Details (expanded content) --- */
.work-details {
  padding: 0 var(--space-xl) var(--space-lg);
  padding-left: calc(var(--space-xl) + 140px + var(--space-md));
  display: grid;
  gap: var(--space-sm);
}

.work-details p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.work-focus {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.focus-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.018);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.company-list {
  color: var(--text-secondary);
  font-size: 0.84rem;
}

.company-list a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: rgba(0, 0, 0, 0.18);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: text-decoration-color var(--dur-normal) var(--ease-out);
}

.company-list a:hover,
.company-list a:focus-visible {
  text-decoration-color: var(--text);
}

/* ============================================================
   BLOG SECTION
   ============================================================ */
.blog-block { display: grid; gap: 0; }

.blog-heading {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border);
}

.blog-heading p { margin: 0; }

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.blog-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  border-right: 1px solid var(--border);
  transition: background var(--dur-normal) var(--ease-out);
  cursor: default;
}

.blog-card:last-child { border-right: 0; }
.blog-card:hover { background: var(--surface-hover); }

.blog-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.blog-tag {
  display: inline-block;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.018);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.blog-date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-tertiary);
}

.blog-card h3 {
  margin: 0;
  font-size: clamp(0.88rem, 1.1vw, 0.98rem);
  font-weight: var(--fw-bold);
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--text);
}

.blog-card > p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.blog-cta {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: var(--fw-semibold);
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: var(--space-2xs);
  transition: color var(--dur-normal) var(--ease-out);
}

.blog-card:hover .blog-cta { color: var(--text); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding: var(--space-md) 0 0;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  margin-top: auto;
  align-items: center;
}

.cv-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: var(--fw-medium);
  text-decoration: none;
  transition: all var(--dur-normal) var(--ease-out);
  background: transparent;
  margin-left: auto;
}

.cv-button:hover {
  color: var(--text);
  background: var(--surface-hover);
  border-color: var(--border-hover);
}

.site-footer span { white-space: nowrap; }

#local-time { color: var(--text-secondary); }

/* ============================================================
   SCROLL REVEAL — entrance animations
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

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

.reveal[data-delay="1"] { transition-delay: 60ms; }
.reveal[data-delay="2"] { transition-delay: 120ms; }
.reveal[data-delay="3"] { transition-delay: 180ms; }
.reveal[data-delay="4"] { transition-delay: 240ms; }

@supports (animation-timeline: view()) {
  .reveal {
    opacity: 1;
    transform: translateY(0);
    transition: none;
    animation: scroll-reveal linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 30%;
  }

  @keyframes scroll-reveal {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

/* ============================================================
   RESPONSIVE — Tablet
   ============================================================ */
@media (max-width: 900px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .site-nav { width: 100%; justify-content: flex-start; flex-wrap: wrap; }

  .contact-panel {
    right: auto;
    left: 0;
  }

  .work-summary {
    position: relative;
    flex-wrap: wrap;
    gap: var(--space-xs);
    padding-right: 48px;
  }

  .work-date { min-width: 100%; }

  .work-toggle {
    position: absolute;
    right: var(--space-md);
    top: 24px;
  }

  .work-details {
    padding-left: var(--space-xl);
  }

  .blog-grid { grid-template-columns: 1fr; }

  .blog-card {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .blog-card:last-child { border-bottom: 0; }
}

/* ============================================================
   RESPONSIVE — Mobile
   ============================================================ */
@media (max-width: 540px) {
  .page-shell { padding: var(--space-md); }

  h1 { font-size: clamp(2rem, 10vw, 2.5rem); }

  .site-nav { gap: var(--space-sm); }

  .work-heading,
  .blog-heading { padding: var(--space-sm) var(--space-md); }

  .work-summary { 
    padding: var(--space-sm) var(--space-md); 
    padding-right: 48px;
  }

  .work-toggle {
    top: 50%;
    transform: translateY(-50%);
  }

  .work-details { padding: 0 var(--space-md) var(--space-md); }

  .blog-card { padding: var(--space-sm) var(--space-md); }

  .site-footer {
    flex-direction: column;
    gap: var(--space-xs);
    align-items: flex-start;
  }
}

/* ============================================================
   FOCUS & SELECTION
   ============================================================ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: rgba(17, 17, 17, 0.1);
  color: var(--text);
}