/* ============================================================
   PORTFOLIO — Teetham Treelayapewat
   style.css — single stylesheet for all pages
   Fonts are loaded with <link> tags in each page's <head>.
   ============================================================ */

/* ── 1. DESIGN TOKENS ───────────────────────────────────────── */
:root {
  --bg:           #0b0f17;
  --surface:      #121925;
  --surface2:     #161d2a;
  --border:       rgba(148, 163, 184, 0.14);
  --border-hover: rgba(148, 163, 184, 0.30);
  --accent:       #2dd4bf;
  --accent-soft:  rgba(45, 212, 191, 0.10);
  --text:         #e6e9ef;
  --text-muted:   #9aa3b2;
  --text-faint:   #6b7586;

  --font-body:    'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --nav-height:   64px;
  --max-width:    1080px;
  --read-width:   760px;
  --radius:       14px;
  --radius-sm:    8px;
  --t:            0.2s ease;
}

/* ── 2. RESET & BASE ────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  /* Keep the footer at the bottom on short pages */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--t);
}

a:hover { color: #fff; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

ul { list-style: none; }

h1, h2, h3, h4 {
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
}

strong { color: #fff; font-weight: 600; }

/* Avoid a lone word on the last line of headings and paragraphs */
h1, h2, h3, h4 { text-wrap: balance; }
p, li, dd { text-wrap: pretty; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 1100;
  background: var(--accent);
  color: var(--bg);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus { top: 12px; color: var(--bg); }

/* ── 3. LAYOUT HELPERS ──────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 72px 0; }

.section + .section { border-top: 1px solid var(--border); }

/* Small mono label above headings */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.section-title {
  font-size: clamp(1.4rem, 2.6vw, 1.75rem);
}

.section-link {
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
}

/* Page header (inner pages) */
.page-header {
  padding: 64px 0 40px;
}

.page-title {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.page-intro {
  margin-top: 14px;
  max-width: 720px;
  text-wrap: balance;
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Tag pill */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  border-radius: 999px;
  white-space: nowrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: background var(--t), color var(--t), border-color var(--t);
}

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary {
  background: var(--accent);
  color: #06201c;
}

.btn-primary:hover { background: #5eead4; color: #06201c; }

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

.btn-ghost:hover {
  color: #fff;
  border-color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
}

/* Fade-in on scroll — only hides content once JS has run */
.js .fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js .fade-in.visible {
  opacity: 1;
  transform: none;
}

/* Bulleted list used by experience and projects */
.bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bullets li {
  position: relative;
  padding-left: 20px;
  color: var(--text);
}

.bullets li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}

/* ── 4. NAVBAR ───────────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-logo {
  font-weight: 600;
  font-size: 1rem;
  color: #fff;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-logo:hover { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: block;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 6px;
  transition: color var(--t), background var(--t);
}

.nav-links a:hover { color: #fff; }

.nav-links a[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.nav-links .nav-cta {
  margin-left: 8px;
  color: var(--accent);
  border: 1px solid rgba(45, 212, 191, 0.35);
}

.nav-links .nav-cta:hover,
.nav-links .nav-cta[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Hamburger (shown on small screens when JS runs) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── 5. HOME — HERO ──────────────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

#particles-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.35;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: center;
  gap: 56px;
  padding-top: 88px;
  padding-bottom: 88px;
}

.hero-name {
  font-size: clamp(2.4rem, 5.2vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.hero-title {
  margin-top: 14px;
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 500;
  color: var(--text);
}

.hero-bio {
  margin-top: 20px;
  max-width: 560px;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 28px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  fill: currentColor;
}

/* Location on its own row; email, LinkedIn and GitHub together below it */
.hero-meta li:first-child { flex-basis: 100%; }
.hero-meta a { color: var(--text-muted); }
.hero-meta a:hover { color: #fff; }

.hero-photo {
  justify-self: end;
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--border);
  background:
    radial-gradient(120% 80% at 50% 100%, rgba(45, 212, 191, 0.16), transparent 60%),
    var(--surface2);
}

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

/* ── 6. HOME — STATS, SUMMARY LISTS ─────────────────────────── */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.stat {
  padding: 26px 24px;
  border-left: 1px solid var(--border);
}

.stat:first-child { border-left: none; }

.stat-value {
  display: block;
  font-size: clamp(1.8rem, 3.2vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.1;
}

.stat-value small {
  font-size: 0.55em;
  font-weight: 600;
  margin-left: 2px;
  color: var(--text-muted);
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.4;
}

.stat-sub {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* Compact rows: experience summary, honors */
.row-list { border-top: 1px solid var(--border); }

.row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  align-items: baseline;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}

.row-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
}

.row-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
}

.row-title span {
  font-weight: 400;
  color: var(--text-muted);
}

.row-body {
  margin-top: 4px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ── 7. EXPERIENCE PAGE ─────────────────────────────────────── */
.role {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  align-items: baseline;
  gap: 24px;
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.role-when {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  line-height: 1.6;
}

.role-when span { display: block; }

.role-company {
  font-size: 1.35rem;
  font-weight: 700;
}

.role-title {
  margin-top: 2px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
}

.role-about {
  margin-top: 6px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.role .bullets {
  margin-top: 20px;
  margin-bottom: 22px;
  max-width: var(--read-width);
}

/* ── 8. PROJECTS PAGE ───────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--t), transform var(--t);
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.project-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.3;
}

.project-note {
  align-self: flex-start;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 6px;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  flex: 1;
}

/* Optional image banner at top of a project card */
.card-img {
  margin: -28px -28px 4px;
  border-radius: var(--radius) var(--radius) 0 0;
  overflow: hidden;
}

.card-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* ── 9. ABOUT PAGE ──────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.prose p {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 680px;
}

.prose p + p { margin-top: 16px; }

.sub-title {
  font-size: 1.15rem;
  margin: 48px 0 18px;
}

.edu-item + .edu-item { margin-top: 22px; }

.edu-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.edu-school {
  font-size: 1.02rem;
  font-weight: 600;
  color: #fff;
}

.edu-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  padding-top: 2px;
}

.edu-detail {
  margin-top: 2px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.skills {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 12px 20px;
}

.skills dt {
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
}

.skills dd {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Side cards */
.side-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.side-card + .side-card { margin-top: 20px; }

.side-card h2 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.side-card .bullets { gap: 8px; }
.side-card .bullets li { font-size: 0.95rem; }

.side-card dl { display: grid; gap: 10px; }

.side-card dt {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.side-card dd {
  font-size: 0.95rem;
  color: var(--text);
}

/* ── 10. CONTACT PAGE ───────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color var(--t), background var(--t);
}

.contact-link:hover {
  border-color: var(--border-hover);
  background: var(--surface2);
  color: var(--text);
}

.contact-link svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  fill: var(--accent);
}

.contact-link-name {
  display: block;
  font-weight: 600;
  color: #fff;
}

.contact-link-label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

/* ── 11. FOOTER ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-faint);
}

.footer-links {
  display: flex;
  gap: 20px;
  font-size: 0.88rem;
}

.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: #fff; }

/* ── 12. RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  .hero-photo {
    order: -1;
    justify-self: start;
    max-width: 200px;
    border-radius: 20px;
  }

  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(n + 3) { border-top: 1px solid var(--border); }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 760px) {
  /* Without JS the links simply wrap under the name */
  .nav-container { flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
  .nav-links { flex-wrap: wrap; }

  /* With JS: hamburger menu */
  .js .nav-container { flex-wrap: nowrap; padding-top: 0; padding-bottom: 0; }
  .js .nav-toggle { display: flex; }

  .js .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .js .nav-links.open { display: flex; }
  .js .nav-links a { padding: 12px; font-size: 1rem; }
  .js .nav-links .nav-cta { margin: 8px 0 0; text-align: center; }

  .section { padding: 56px 0; }
  .page-header { padding: 48px 0 24px; }

  .row,
  .role {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .role { padding: 32px 0; }
  .role-when span { display: inline; }
  .role-when span + span::before { content: ' · '; }

  .projects-grid,
  .contact-grid { grid-template-columns: 1fr; }

  .project-card { padding: 22px; }
  .card-img { margin: -22px -22px 4px; }

  .skills { grid-template-columns: 1fr; gap: 2px; }
  .skills dd + dt { margin-top: 12px; }
}

@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr; }
  .stat { border-left: none; }
  .stat + .stat { border-top: 1px solid var(--border); }
}

/* ── 13. REDUCED MOTION ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .js .fade-in { opacity: 1; transform: none; }
  .project-card:hover { transform: none; }
  #particles-canvas { display: none; }
}

/* Version 2: a calmer portfolio with visible engineering evidence. */
:root { --text-faint: #94a3b8; --max-width: 1120px; }
html { scroll-padding-top: 90px; }
.js .fade-in { opacity: 1; transform: none; transition: none; }
.nav-links a { padding: 12px 10px; }
.nav-toggle { width: 44px; height: 44px; }
.btn { min-height: 44px; }
.hero-inner { grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 48px; padding-top: 64px; padding-bottom: 64px; }
.hero-name { font-size: clamp(2.15rem, 4.5vw, 3.25rem); }
.hero-photo { max-width: 290px; border-radius: 18px; }
.hero-title { color: var(--accent); }
.hero-focus { margin-top: 18px; font-size: .85rem; color: var(--text-muted); }
.hero-bio { font-size: 1rem; }
.hero-actions { margin-top: 24px; }
.hero-meta { margin-top: 24px; }
.section { padding: 52px 0; }
.featured-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.feature-card { overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.pipeline { padding: 24px; display: flex; flex-direction: column; gap: 6px; align-items: center; background: linear-gradient(125deg, #102c2c, #121925); }
.pipeline span { padding: 7px 20px; border: 1px solid #40615f; border-radius: 6px; background: #142a2c; font-size: .85rem; color: #e6e9ef; }
.pipeline b { color: var(--accent); line-height: 1; }
/* Same diagram height in both cards so the text below lines up */
.featured-grid .pipeline { min-height: 288px; justify-content: center; }
.feature-content { padding: 28px; }
.feature-content h3 { font-size: 1.35rem; margin-bottom: 12px; }
.feature-content > p:not(.eyebrow) { color: var(--text-muted); font-size: .95rem; }
.feature-content .feature-result { color: var(--text); margin: 18px 0; font-weight: 600; }
.feature-result span { color: var(--text-muted); font-weight: 400; }
.case-label { font-size: .92rem; margin-top: 6px; }
.project-card:hover { transform: none; }
.project-meta, .tag, .eyebrow { font-size: .8rem; }
@media (max-width: 1000px) and (min-width: 761px) { .nav-logo { font-size: .85rem; } .nav-links a { font-size: .82rem; padding: 12px 7px; } }
@media (max-width: 900px) { .hero-inner { grid-template-columns: minmax(0,1fr) 200px; gap: 28px; } .hero-photo { order: 0; } }
@media (max-width: 760px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 32px; padding-bottom: 36px; gap: 24px; }
  .hero-photo { order: 0; max-width: 120px; justify-self: start; border-radius: 12px; }
  .hero-bio { margin-top: 14px; line-height: 1.6; }
  .hero-name { overflow-wrap: anywhere; }
  .hero-focus { font-size: .78rem; }
  .hero-meta { gap: 8px 16px; }
  .hero-meta li:nth-child(2) { flex-basis: 100%; }
  .featured-grid { grid-template-columns: 1fr; }
  .featured-grid .pipeline { min-height: 0; }
  .section { padding: 36px 0; }
  .feature-content { padding: 22px; }
  .row-date, .role-when { font-size: .86rem; }
}
@media print {
  :root { --text: #18212f; --text-muted: #384657; --text-faint: #485569; --accent: #086c60; --border: #cbd5e1; }
  body { background: white; color: #18212f; font-size: 10pt; }
  .navbar, .footer, .skip-link { display: none; }
  h1,h2,h3,h4,strong,.edu-school,.row-title { color: #18212f; }
  .container { max-width: none; padding: 0; }
  .page-header { padding: 0 0 24px; }
  .page-title { font-size: 26pt; }
  .role { padding: 18px 0; }
  .role .bullets { margin: 10px 0; }
  .role, .row, .edu-item { break-inside: avoid; }
  .tags { display: none; }
  .sub-title { margin-top: 24px; }
  a { color: #086c60; }
  @page { margin: 16mm; }
}
.project-card .project-desc { flex: none; }
.project-card > .section-link { margin-top: auto; }