/* ============================================
   Portfolio — CSS custom properties
   ============================================ */
:root {
  /* Spacing (8px scale) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-8: 80px;

  /* Layout */
  --nav-width: 280px;
  --content-max-width: 800px;
  --content-max-width-project: 1080px;
  --main-padding-x: var(--space-3);

  /* Colors */
  --bg-dark: #0a0a0a;
  --bg-center: #1a1a1a;
  --text: #e0e0e0;
  --text-muted: #888888;
  --border: #cccccc;
  --accent: rgba(77, 220, 120, 1);

  /* Typography */
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, "Cascadia Mono", "Courier New", monospace;
  --fs-marquee: 2.5rem;
  --fs-page-title: 1.75rem;
  --fs-project-title: 2rem;
  --fs-nav-header: 1.25rem;
  --fs-pill: 0.9375rem;
  --fs-pill-sub: 0.8125rem;
  --fs-small-link: 0.875rem;
  --fs-body: 1rem;
  --fs-copyright: 0.75rem;
  --line-body: 1.6;
}

/* ============================================
   Reset / base
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-body);
  line-height: var(--line-body);
  color: var(--text);
  background: radial-gradient(ellipse at center, var(--bg-center) 0%, var(--bg-dark) 70%);
  min-height: 100vh;
  cursor: url("../images/mouse.png") 12 20, auto;
}

a,
button,
[role="button"],
input[type="submit"],
input[type="button"] {
  cursor: url("../images/mouse(hover).png") 12 20, pointer;
}

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

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ============================================
   Marquee
   ============================================ */
.marquee-wrap {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  overflow: hidden;
  z-index: 10;
  background: linear-gradient(to bottom, var(--bg-dark) 0%, transparent 100%);
  padding-top: 1px;
  padding-bottom: var(--space-2);
}

.marquee-inner {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  animation: marquee 45s linear infinite;
  will-change: transform;
}

.marquee-spacer {
  display: inline-block;
  width: 100vw;
  flex-shrink: 0;
}

@keyframes marquee {
  0% {
    transform: translateX(calc(-50% - 50vw));
  }
  100% {
    transform: translateX(0);
  }
}

.marquee-text {
  font-size: var(--fs-marquee);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ============================================
   Layout — fixed nav + main
   ============================================ */
.layout {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 100vh;
  padding-top: calc(var(--fs-marquee) + var(--space-2) + var(--space-2));
}

/* Left nav — fixed, transparent so pills float */
.side-nav {
  position: fixed;
  top: calc(var(--fs-marquee) + var(--space-2) + var(--space-2));
  left: 0;
  bottom: 0;
  width: var(--nav-width);
  background: transparent;
  display: flex;
  flex-direction: column;
  padding: var(--space-2) var(--space-1);
  z-index: 5;
  border-right: none;
  overflow-y: auto;
  min-height: 0;
}

.side-nav-home {
  list-style: none;
  margin: 0 0 var(--space-2);
  padding: 0;
  flex-shrink: 0;
}

.side-nav-home a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  color: var(--text);
  transition: color 0.2s;
  text-decoration: none;
}

.side-nav-home a .pill-label {
  display: inline-block;
  padding: 4px var(--space-1);
  border-radius: 9999px;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  font-size: 0.75rem;
  color: inherit;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s, background-color 0.2s, transform 0.2s ease;
  box-shadow: 0 0 11px rgba(255, 255, 255, 0.18);
  white-space: nowrap;
  transform: translate(var(--mx, 0px), var(--my, 0px));
}

.side-nav-home a:hover .pill-label {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(77, 220, 120, 0.45);
  background-color: rgba(77, 220, 120, 0.06);
  transform: translate(var(--mx, 0px), var(--my, 0px)) scale(1.02);
}

.side-nav-home a.active .pill-label {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(77, 220, 120, 0.5);
  background-color: rgba(77, 220, 120, 0.06);
}

.side-nav-header {
  font-size: 0.9375rem;
  color: var(--accent);
  margin-bottom: var(--space-1);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.side-nav-pills {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 0;
}

.side-nav-pills a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  color: var(--text);
  transition: color 0.2s;
  flex-shrink: 0;
  text-decoration: none;
}

.side-nav-pills a .pill-label {
  display: inline-block;
  padding: 4px var(--space-1);
  border-radius: 9999px;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  font-size: 0.75rem;
  color: inherit;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s, background-color 0.2s, transform 0.2s ease;
  box-shadow: 0 0 11px rgba(255, 255, 255, 0.18);
  white-space: nowrap;
  transform: translate(var(--mx, 0px), var(--my, 0px));
}

.side-nav-pills a:hover .pill-label {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(77, 220, 120, 0.45);
  background-color: rgba(77, 220, 120, 0.06);
  transform: translate(var(--mx, 0px), var(--my, 0px)) scale(1.02);
}

.side-nav-pills a.active .pill-label {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(77, 220, 120, 0.5);
  background-color: rgba(77, 220, 120, 0.06);
}

.side-nav-pills .pill-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
  font-weight: normal;
  flex-shrink: 0;
}

.side-nav-links {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.side-nav-links a {
  font-size: 0.75rem;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

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

.side-nav-footer {
  margin-top: var(--space-2);
  padding-top: var(--space-1);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  flex-shrink: 0;
}

.side-nav-footer svg {
  width: 18px;
  height: 18px;
  fill: var(--text);
  transition: fill 0.2s;
}

.side-nav-footer a:hover svg {
  fill: var(--accent);
}

.side-nav-footer .copyright {
  font-size: 0.625rem;
  color: var(--text-muted);
}

/* Vertical shrink: scale down nav when viewport height is reduced */
@media (max-height: 700px) {
  .side-nav {
    padding: var(--space-1);
  }
  .side-nav-header {
    font-size: 0.8125rem;
    margin-bottom: 2px;
    padding-bottom: 2px;
  }
  .side-nav-pills {
    gap: 2px;
  }
  .side-nav-pills a .pill-label {
    font-size: 0.6875rem;
    padding: 2px 6px;
    border-width: 1.5px;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.15);
  }
  .side-nav-pills .pill-sub {
    font-size: 0.625rem;
  }
  .side-nav-links {
    margin-top: var(--space-1);
    gap: 1px;
  }
  .side-nav-links a {
    font-size: 0.6875rem;
  }
  .side-nav-footer {
    margin-top: var(--space-1);
    padding-top: 2px;
  }
  .side-nav-footer svg {
    width: 14px;
    height: 14px;
  }
  .side-nav-footer .copyright {
    font-size: 0.5625rem;
  }
}

/* Main content — scrollable */
.main {
  flex: 1;
  margin-left: var(--nav-width);
  padding: var(--space-5) var(--main-padding-x) var(--space-8);
  min-width: 0;
}

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

.main-inner.project-page,
.main-inner.index-page {
  max-width: var(--content-max-width-project);
}

/* ============================================
   Homepage
   ============================================ */
.page-title {
  font-size: var(--fs-page-title);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
  margin: 0 0 var(--space-5);
}

.portrait-placeholder {
  aspect-ratio: 2 / 3;
  max-width: 400px;
  margin: 0 auto var(--space-5);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}
.portrait-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 4px;
}

.home-intro {
  margin-top: var(--space-5);
}

.home-intro p {
  margin: 0 0 var(--space-2);
}

.home-intro p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Project page
   ============================================ */
.project-header {
  text-align: center;
  margin: 0 0 var(--space-5);
}

.project-title {
  font-size: var(--fs-project-title);
  color: #fff;
  text-align: center;
  letter-spacing: 0.05em;
  margin: 0 0 var(--space-2);
}

.project-page .project-title {
  text-transform: none;
}

.project-subtitle {
  font-size: 1.25rem;
  color: var(--accent);
  text-align: left;
  margin: var(--space-2) 0 var(--space-4);
}

.project-section {
  margin-bottom: var(--space-5);
}

.project-section h3 {
  font-size: var(--fs-nav-header);
  color: var(--accent);
  margin: 0 0 var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.project-page h2 {
  font-size: var(--fs-nav-header);
  color: var(--accent);
  margin: var(--space-4) 0 var(--space-2);
  letter-spacing: 0.03em;
}

.project-page h2:first-of-type {
  margin-top: 0;
}

.project-section p {
  margin: 0 0 var(--space-2);
}

.project-section ul {
  margin: 0;
  padding-left: var(--space-3);
  list-style: disc;
}

.project-section ul li {
  margin-bottom: var(--space-1);
}

.media-placeholder,
.video-placeholder {
  min-height: 280px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--fs-small-link);
  margin: var(--space-3) 0;
}

.video-placeholder {
  min-height: 320px;
}

.media-placeholder-portrait {
  aspect-ratio: 2 / 3;
  min-height: 0;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.media-placeholder-small {
  min-height: 200px;
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}

.media-figure {
  margin: var(--space-3) 0 var(--space-5);
}

.media-figure-small {
  margin: var(--space-3) 0;
}

.media-caption {
  text-align: center;
  font-size: var(--fs-pill-sub);
  color: var(--text-muted);
  margin-top: var(--space-1);
  margin-bottom: 0;
}

.project-page .caption {
  font-size: var(--fs-pill-sub);
  color: var(--text-muted);
  margin: var(--space-2) 0 var(--space-1);
}

.chart-placeholder {
  min-height: 280px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--fs-small-link);
  margin: 0 0 var(--space-4);
}

.project-links {
  list-style: none;
  padding-left: 0;
  margin: var(--space-4) 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.project-links a {
  text-decoration: underline;
  text-underline-offset: 2px;
  color: var(--text);
  transition: color 0.2s;
}

.project-links a:hover {
  color: var(--accent);
}

.project-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0 var(--space-4);
  font-size: var(--fs-pill);
}

.project-table th,
.project-table td {
  border: 1px solid var(--border);
  padding: var(--space-1) var(--space-2);
  text-align: left;
}

.project-table th {
  color: var(--accent);
}

.media-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-3) 0;
}

.return-link {
  display: block;
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--fs-small-link);
  color: var(--text);
}

.return-link:hover {
  color: var(--accent);
}

/* ============================================
   Coursework / CV page
   ============================================ */
.main-cv .cv-inner {
  max-width: none;
  padding: 0;
}

.cv-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
}

.cv-section {
  font-size: var(--fs-nav-header);
  color: var(--accent);
  margin: var(--space-4) 0 var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.cv-section:first-child {
  margin-top: 0;
}

.cv-subsection {
  font-size: var(--fs-body);
  color: var(--text);
  margin: var(--space-3) 0 var(--space-1);
  font-weight: 600;
}

.cv-subsection-upper {
  text-transform: uppercase;
  margin-top: var(--space-4);
}

.cv-subsub {
  font-size: var(--fs-pill);
  color: var(--text-muted);
  margin: var(--space-1) 0;
}

.cv-line {
  font-size: var(--fs-pill);
  margin: 0 0 var(--space-3);
  line-height: 1.5;
}

.cv-date {
  font-size: var(--fs-pill-sub);
  color: var(--text-muted);
  margin: 0 0 var(--space-1);
}

.cv-block {
  margin-bottom: var(--space-3);
}

.cv-block p {
  margin: 0 0 var(--space-1);
  font-size: var(--fs-body);
}

.cv-list {
  list-style: disc;
  padding-left: var(--space-3);
  margin: 0 0 var(--space-3);
}

.cv-list li {
  margin-bottom: 2px;
  font-size: var(--fs-pill);
}

.cv-job {
  margin-bottom: var(--space-4);
}

.cv-job-title {
  font-weight: 600;
  margin: 0 0 var(--space-1);
  font-size: var(--fs-body);
}

.cv-job p {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-pill);
  line-height: 1.5;
}

.cv-job p:last-child {
  margin-bottom: 0;
}

@media (max-width: 900px) {
  .cv-columns {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Responsive — nav collapse at ~900px
   ============================================ */
@media (max-width: 900px) {
  .marquee-wrap {
    padding-bottom: var(--space-1);
  }

  .layout {
    flex-direction: column;
    padding-top: calc(var(--fs-marquee) + var(--space-2));
  }

  .side-nav {
    position: relative;
    top: 0;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .side-nav-home {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-1);
    margin-bottom: 0;
  }

  .side-nav-header {
    width: 100%;
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
  }

  .side-nav-pills {
    flex: none;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-1);
  }

  .side-nav-links {
    flex-direction: row;
    flex-wrap: wrap;
    margin-top: 0;
    margin-left: auto;
  }

  .side-nav-footer {
    width: 100%;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    margin-top: var(--space-2);
    padding-top: var(--space-2);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }

  .main {
    margin-left: 0;
    padding: var(--space-4) var(--space-2) var(--space-6);
  }

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

/* ============================================
   Particle background — subtle always-on (js/enhancements.js)
   ============================================ */
.particle-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent);
  z-index: 10002;
  transition: width 0.12s ease-out;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress { display: none; }
}

::selection {
  background: rgba(77, 220, 120, 0.35);
  color: var(--text);
}

@media (prefers-reduced-motion: reduce) {
  .particle-bg { display: none; }
}

/* ============================================
   Enhancements — scroll reveal (via js/enhancements.js)
   ============================================ */
.main-inner > *.in-view {
  animation: reveal-in 0.5s ease-out forwards;
}

.main-inner > ul.in-view > li {
  opacity: 0;
  transform: translateY(6px);
  animation: reveal-in 0.4s ease-out forwards;
}

@keyframes reveal-in {
  from {
    opacity: 0.92;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Image focus overlay — click image to focus, click outside to close */
.image-focus-target {
  cursor: pointer;
}

.image-focus-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.image-focus-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.image-focus-overlay-img {
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  object-fit: contain;
  pointer-events: none;
  border-radius: 4px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  animation: focus-image-in 0.2s ease-out;
}

@keyframes focus-image-in {
  from {
    opacity: 0;
    transform: scale(0.98);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}