/* ================================================================
   THOMAS HUNG — PORTFOLIO  |  style.css
   Shared stylesheet — edit once, changes everywhere.
   ================================================================ */

/* ----------------------------------------------------------------
   1. CSS VARIABLES
   ---------------------------------------------------------------- */
:root {
  --bg:             #090B10;
  --bg-raised:      #10131A;
  --bg-card:        #151921;
  --border:         #1C2030;
  --border-hover:   #2A3050;
  --text:           #B0B8C8;
  --text-strong:    #E2E7F0;
  --accent:         #4E8FFF;
  --accent-glow:    rgba(78, 143, 255, 0.15);
  --accent-dim:     rgba(78, 143, 255, 0.07);
  --muted:          #5C6578;

  --font-display:   'Playfair Display', Georgia, serif;
  --font-body:      'Outfit', system-ui, sans-serif;
  --font-mono:      'JetBrains Mono', monospace;

  --max-w:          1100px;
  --radius:         12px;
  --radius-sm:      8px;
}

/* ----------------------------------------------------------------
   2. RESET
   ---------------------------------------------------------------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .8; }

/* ----------------------------------------------------------------
   3. LAYOUT UTILITIES
   ---------------------------------------------------------------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 16px; }
section    { padding: 100px 0; }

.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
}
.section-label::before {
  content: ''; width: 28px; height: 1px; background: var(--accent);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 46px);
  color: var(--text-strong);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 48px;
}

/* ----------------------------------------------------------------
   4. NAVIGATION
   ---------------------------------------------------------------- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(9,11,16,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
nav .container {
  display: flex; justify-content: space-between; align-items: center;
  height: 64px;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text-strong);
  font-weight: 600;
  letter-spacing: -0.5px;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.5px;
  transition: color .25s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-strong); opacity: 1; }

.nav-toggle {
  display: none; background: none; border: none;
  cursor: pointer; padding: 8px; flex-direction: column; gap: 5px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-strong);
  transition: all .3s;
}

/* ----------------------------------------------------------------
   5. HERO
   ---------------------------------------------------------------- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 64px;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .3;
  mask-image: radial-gradient(ellipse 65% 55% at 50% 45%, black 15%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 65% 55% at 50% 45%, black 15%, transparent 70%);
}

/* Two-column hero layout */
.hero-split {
  display: grid;
  grid-template-columns: 1fr 460px;
  gap: 48px;
  align-items: center;
  position: relative; z-index: 1;
  width: 100%;
}
@media (max-width: 1024px) {
  .hero-split { grid-template-columns: 1fr; }
  .hero-collage { display: none; }
}
.hero-inner { position: relative; z-index: 1; }

/* Photo collage */
.hero-collage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 260px 260px;
  gap: 12px;
}
.hero-collage-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.hero-collage-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  position: absolute; inset: 0;
}
/* First image spans both rows on the left */
.hero-collage-img--1 {
  grid-row: 1 / 3;
}
/* 2nd and 3rd stack on the right */
.hero-collage-img--2 { grid-column: 2; grid-row: 1; }
.hero-collage-img--3 { grid-column: 2; grid-row: 2; }

.collage-placeholder {
  font-family: var(--font-mono);
  font-size: 10px; color: var(--muted);
  letter-spacing: 1px; text-align: center;
  padding: 12px;
  pointer-events: none;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px; color: var(--accent);
  letter-spacing: 2.5px; margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(46px, 7vw, 86px);
  color: var(--text-strong);
  font-weight: 400; line-height: 1.06;
  margin-bottom: 28px;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-desc {
  max-width: 540px; font-size: 17px;
  color: var(--muted); line-height: 1.85;
  margin-bottom: 44px;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 30px;
  background: var(--accent); color: #fff;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 1.2px; text-transform: uppercase;
  border-radius: 6px; border: none; cursor: pointer;
  transition: transform .2s, box-shadow .2s;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(78,143,255,.3);
  opacity: 1;
}
.btn svg { width: 15px; height: 15px; }
.btn-outline {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-strong);
}
.btn-outline:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(78,143,255,.12);
}

/* Stats */
.hero-stats {
  display: flex; gap: 56px;
  margin-top: 72px; padding-top: 32px;
  border-top: 1px solid var(--border);
}
.stat-val {
  font-family: var(--font-display);
  font-size: 38px; color: var(--text-strong);
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 10px; color: var(--muted);
  letter-spacing: 2px; text-transform: uppercase;
  margin-top: 4px;
}

/* ----------------------------------------------------------------
   6. PROJECT CARDS
   ---------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .3s, transform .3s;
  text-decoration: none; color: inherit;
  display: block;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  opacity: 1;
}
.project-card-img {
  height: 210px;
  background: var(--bg-raised);
  position: relative;
  overflow: hidden;
}
/* Placeholder shown when no image */
.project-card-img::after {
  content: 'Image coming soon';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--muted); letter-spacing: 1px;
}
.project-card-img.has-image::after { display: none; }
.project-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.project-card-body { padding: 28px 28px 32px; }
.project-tag {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 12px;
}
.project-card-body h3 {
  font-family: var(--font-display);
  font-size: 22px; color: var(--text-strong);
  font-weight: 400; margin-bottom: 10px;
}
.project-card-body p {
  font-size: 14px; color: var(--muted);
  line-height: 1.7; margin-bottom: 20px;
}
.pill-row { display: flex; flex-wrap: wrap; gap: 7px; }
.pill {
  font-family: var(--font-mono);
  font-size: 10px; padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent); border-radius: 100px;
  letter-spacing: .5px;
}
.card-arrow {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--accent);
  display: flex; align-items: center; gap: 6px;
  margin-top: 20px; letter-spacing: .5px;
}

/* ----------------------------------------------------------------
   7. EXPERIENCE TIMELINE
   ---------------------------------------------------------------- */
.timeline { position: relative; }
.timeline::before {
  content: ''; position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px; background: var(--border);
}
.timeline-item {
  padding-left: 44px; position: relative;
  margin-bottom: 52px;
}
.timeline-item::before {
  content: ''; position: absolute;
  left: -4px; top: 8px;
  width: 9px; height: 9px;
  border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-raised);
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--accent);
  letter-spacing: 1.5px; margin-bottom: 8px;
}
.timeline-item h3 {
  font-family: var(--font-display);
  font-size: 21px; color: var(--text-strong);
  font-weight: 400; margin-bottom: 4px;
}
.timeline-item h4 {
  font-size: 13.5px; color: var(--muted);
  font-weight: 400; margin-bottom: 12px;
}
.timeline-item p {
  font-size: 14.5px; color: var(--text); max-width: 600px;
}

/* ----------------------------------------------------------------
   8. SKILLS GRID
   ---------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.skill-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.skill-box h3 {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 20px;
}
.skill-box ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.skill-box li {
  font-size: 15px; color: var(--text);
  display: flex; align-items: center; gap: 10px;
}
.skill-box li::before {
  content: '›'; color: var(--accent); font-size: 18px; font-weight: 600;
}

/* ----------------------------------------------------------------
   9. CONTACT
   ---------------------------------------------------------------- */
.contact-wrap {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: start;
}
.contact-wrap p {
  font-size: 17px; color: var(--muted);
  line-height: 1.85; margin-bottom: 32px;
}
.contact-items { display: flex; flex-direction: column; gap: 14px; }
.contact-item {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 22px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-family: var(--font-mono); font-size: 13.5px;
  transition: border-color .25s;
}
.contact-item:hover { border-color: var(--accent); opacity: 1; }
.contact-item svg { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; }

/* ----------------------------------------------------------------
   10. FOOTER
   ---------------------------------------------------------------- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0; text-align: center;
}
footer p {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--muted); letter-spacing: .5px;
}

/* ----------------------------------------------------------------
   11. PROJECT DETAIL PAGES
   ---------------------------------------------------------------- */
.project-hero {
  padding-top: 140px; padding-bottom: 72px;
  position: relative;
}
.project-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .2;
  mask-image: radial-gradient(ellipse 80% 60% at 20% 50%, black 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 20% 50%, black 10%, transparent 70%);
}
.project-hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px; color: var(--accent);
  letter-spacing: 2.5px; text-transform: uppercase;
  margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
  position: relative; z-index: 1;
}
.project-hero-eyebrow a {
  color: var(--muted); transition: color .2s;
}
.project-hero-eyebrow a:hover { color: var(--accent); opacity: 1; }
.project-hero-eyebrow .sep { color: var(--border); }
.project-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 60px);
  color: var(--text-strong);
  font-weight: 400; line-height: 1.1;
  margin-bottom: 20px;
  position: relative; z-index: 1;
}
.project-hero .subtitle {
  font-size: 18px; color: var(--muted);
  max-width: 620px; line-height: 1.8;
  margin-bottom: 40px;
  position: relative; z-index: 1;
}
.project-meta {
  display: flex; flex-wrap: wrap; gap: 32px;
  position: relative; z-index: 1;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.project-meta-item { display: flex; flex-direction: column; gap: 6px; }
.project-meta-label {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--muted);
}
.project-meta-value {
  font-size: 15px; color: var(--text-strong);
}

/* Hero image banner */
.project-banner {
  width: 100%;
  height: 460px;
  background: var(--bg-raised);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--border);
  margin-bottom: 80px;
}
.project-banner::after {
  content: 'Hero image — drop a photo in /images/ and uncomment the <img> tag';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 13px;
  color: var(--muted); letter-spacing: 1px;
  text-align: center; padding: 40px;
}
.project-banner.has-image::after { display: none; }
.project-banner img {
  width: 100%; height: 100%;
  object-fit: cover; position: relative; z-index: 1;
}

/* Content column */
.project-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 64px;
  align-items: start;
}
.project-content h2 {
  font-family: var(--font-display);
  font-size: 28px; color: var(--text-strong);
  font-weight: 400; margin-top: 56px; margin-bottom: 18px;
}
.project-content h2:first-child { margin-top: 0; }
.project-content p {
  font-size: 16px; line-height: 1.85;
  color: var(--text); margin-bottom: 18px;
}
.project-content ul {
  margin: 0 0 24px 0;
  list-style: none;
  display: flex; flex-direction: column; gap: 10px;
}
.project-content li {
  font-size: 15px; color: var(--text); line-height: 1.7;
  display: flex; align-items: flex-start; gap: 10px;
}
.project-content li::before {
  content: '›'; color: var(--accent);
  font-size: 18px; font-weight: 600; flex-shrink: 0; margin-top: -1px;
}

/* Sidebar specs card */
.project-sidebar { position: sticky; top: 88px; }
.specs-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}
.specs-card-title {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 20px;
}
.spec-row {
  display: flex; justify-content: space-between;
  align-items: flex-start; gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
}
.spec-row:last-child { border-bottom: none; padding-bottom: 0; }
.spec-key { color: var(--muted); font-family: var(--font-mono); font-size: 11px; flex-shrink: 0; }
.spec-val { color: var(--text-strong); text-align: right; }

/* Highlight / callout box */
.callout {
  background: var(--accent-dim);
  border: 1px solid rgba(78,143,255,.25);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 32px 0;
}
.callout p {
  font-size: 15px; color: var(--text-strong);
  margin: 0; line-height: 1.7;
}

/* Photo gallery */
.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 32px 0 8px;
}
.photo-gallery-item {
  aspect-ratio: 4/3;
  background: var(--bg-raised);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden; position: relative;
}
.photo-gallery-item::after {
  content: 'Add photo';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--muted); letter-spacing: 1px;
}
.photo-gallery-item.has-image::after { display: none; }
.photo-gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover; position: relative; z-index: 1;
  transition: transform .4s;
}
.photo-gallery-item:hover img { transform: scale(1.04); }
.photo-caption {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--muted);
  text-align: center; margin-top: 8px;
  letter-spacing: .5px;
}

/* Lightbox */
.photo-gallery-item { cursor: zoom-in; }
.lightbox {
  display: none;
  position: fixed; inset: 0; z-index: 999;
  background: rgba(0,0,0,.92);
  align-items: center; justify-content: center;
  padding: 24px;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 100%; max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(0,0,0,.6);
  object-fit: contain;
}
.lightbox-close {
  position: absolute; top: 20px; right: 24px;
  font-family: var(--font-mono); font-size: 13px;
  color: var(--muted); cursor: pointer;
  background: none; border: none;
  letter-spacing: 1px;
  transition: color .2s;
}
.lightbox-close:hover { color: var(--text-strong); }

/* Back link */
.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--muted); margin-top: 64px; margin-bottom: 80px;
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color .2s, color .2s;
}
.back-link:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }

/* ----------------------------------------------------------------
   12. SCROLL REVEAL
   ---------------------------------------------------------------- */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity .65s ease, transform .65s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.stagger > .reveal { transition-delay: calc(var(--i, 0) * 90ms); }

/* ----------------------------------------------------------------
   13. MOBILE NAV (show/hide)
   ---------------------------------------------------------------- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(9,11,16,.97);
    border-bottom: 1px solid var(--border);
    flex-direction: column; gap: 0;
    padding: 12px 0;
  }
  .nav-links.show { display: flex; }
  .nav-links li a { display: block; padding: 14px 32px; }
  .nav-toggle { display: flex; }

  section { padding: 64px 0; }
  .container { padding: 0 16px; }

  .hero-stats { flex-direction: column; gap: 24px; }
  .contact-wrap { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }

  .project-layout { grid-template-columns: 1fr; }
  .project-sidebar { position: static; }
  .project-banner { height: 260px; }
  .photo-gallery { grid-template-columns: 1fr; }
  .project-meta { flex-direction: column; gap: 20px; }
}