/* ============================================================
   The Engineer Guy — Portfolio
   Material Design 3 inspired, self-contained (no build step)
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand / primary (Material indigo-blue) */
  --md-primary: #4355b9;
  --md-primary-hover: #3546a3;
  --md-on-primary: #ffffff;
  --md-primary-container: #dfe0ff;
  --md-on-primary-container: #00105c;

  --md-secondary: #00629d;
  --md-tertiary: #6f5d0e;

  /* Neutral surfaces */
  --md-background: #fbfbff;
  --md-surface: #ffffff;
  --md-surface-1: #f4f4fb;
  --md-surface-2: #eceef7;
  --md-surface-variant: #e3e1ec;
  --md-on-surface: #1b1b1f;
  --md-on-surface-variant: #46464f;
  --md-outline: #c7c6d0;
  --md-outline-variant: #e3e1ec;

  --md-success: #2e7d32;

  /* Elevation shadows */
  --elev-1: 0 1px 2px rgba(0,0,0,.10), 0 1px 3px rgba(0,0,0,.06);
  --elev-2: 0 2px 6px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
  --elev-3: 0 8px 24px rgba(0,0,0,.10), 0 4px 8px rgba(0,0,0,.06);
  --elev-4: 0 16px 40px rgba(0,0,0,.14), 0 6px 12px rgba(0,0,0,.08);

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-full: 999px;

  --maxw: 1140px;
  --nav-h: 66px;

  --font-sans: 'Roboto', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

:root[data-theme="dark"] {
  --md-primary: #bcc2ff;
  --md-primary-hover: #d3d7ff;
  --md-on-primary: #12245e;
  --md-primary-container: #2b3b8f;
  --md-on-primary-container: #dfe0ff;

  --md-secondary: #94ccff;
  --md-tertiary: #dcc66e;

  --md-background: #121318;
  --md-surface: #1b1b21;
  --md-surface-1: #212128;
  --md-surface-2: #282932;
  --md-surface-variant: #46464f;
  --md-on-surface: #e5e1e9;
  --md-on-surface-variant: #c7c6d0;
  --md-outline: #545460;
  --md-outline-variant: #35343b;

  --md-success: #7fd68a;

  --elev-1: 0 1px 2px rgba(0,0,0,.40), 0 1px 3px rgba(0,0,0,.30);
  --elev-2: 0 2px 6px rgba(0,0,0,.45), 0 1px 2px rgba(0,0,0,.30);
  --elev-3: 0 8px 24px rgba(0,0,0,.50), 0 4px 8px rgba(0,0,0,.35);
  --elev-4: 0 16px 40px rgba(0,0,0,.55), 0 6px 12px rgba(0,0,0,.40);
}

/* ---------- Reset / base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: var(--font-sans);
  background: var(--md-background);
  color: var(--md-on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
section { scroll-margin-top: var(--nav-h); }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.15; font-weight: 700; letter-spacing: -.01em; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--md-primary);
  font-weight: 500;
}
.section-title { font-size: clamp(1.7rem, 4vw, 2.4rem); margin: .4rem 0 .5rem; }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head p { color: var(--md-on-surface-variant); font-size: 1.05rem; }
.section-pad { padding: clamp(64px, 9vw, 120px) 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-size: .95rem; font-weight: 500;
  padding: 12px 24px; border-radius: var(--radius-full);
  border: none; cursor: pointer; transition: all .2s ease;
  white-space: nowrap;
}
.btn .material-symbols-rounded { font-size: 20px; }
.btn-filled { background: var(--md-primary); color: var(--md-on-primary); box-shadow: var(--elev-1); }
.btn-filled:hover { background: var(--md-primary-hover); box-shadow: var(--elev-2); transform: translateY(-1px); }
.btn-tonal { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.btn-tonal:hover { box-shadow: var(--elev-2); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--md-primary); border: 1px solid var(--md-outline); }
.btn-outline:hover { background: var(--md-surface-2); border-color: var(--md-primary); }

/* ---------- Navigation ---------- */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: transparent;
  transition: background .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}
#nav.scrolled {
  background: color-mix(in srgb, var(--md-surface) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  box-shadow: var(--elev-1);
}
#nav .container { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; letter-spacing: -.02em; }
.brand .logo {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--md-primary); color: var(--md-on-primary);
  font-family: var(--font-mono); font-weight: 700; font-size: 1rem;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: var(--radius-full);
  font-size: .92rem; font-weight: 500; color: var(--md-on-surface-variant);
  transition: all .2s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--md-primary); background: var(--md-surface-2); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 42px; height: 42px; border-radius: var(--radius-full);
  display: grid; place-items: center; cursor: pointer;
  background: transparent; border: none; color: var(--md-on-surface-variant);
  transition: background .2s ease, color .2s ease;
}
.icon-btn:hover { background: var(--md-surface-2); color: var(--md-primary); }
.nav-toggle { display: none; }

/* Mobile drawer */
@media (max-width: 860px) {
  .nav-links {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--md-surface); padding: 12px;
    box-shadow: var(--elev-3);
    transform: translateY(-140%); transition: transform .3s ease;
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 16px; border-radius: var(--radius-sm); }
  .nav-toggle { display: grid; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 40px) 0 60px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 55% at 78% 20%, color-mix(in srgb, var(--md-primary) 22%, transparent), transparent 70%),
    radial-gradient(50% 50% at 12% 88%, color-mix(in srgb, var(--md-secondary) 18%, transparent), transparent 70%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(currentColor 1px, transparent 1px);
  background-size: 30px 30px; color: var(--md-outline);
  opacity: .18;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 75%);
  mask-image: radial-gradient(70% 60% at 50% 40%, #000, transparent 75%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.3fr .9fr; gap: 56px; align-items: center; }
.hero-status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: var(--radius-lg);
  background: var(--md-surface); box-shadow: var(--elev-1);
  font-size: .85rem; font-weight: 500; color: var(--md-on-surface-variant);
  margin-bottom: 22px; max-width: 100%;
}
.status-dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; background: var(--md-success); box-shadow: 0 0 0 4px color-mix(in srgb, var(--md-success) 25%, transparent); }
.status-text { min-width: 0; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); margin-bottom: 10px; }
.hero h1 .grad {
  background: linear-gradient(120deg, var(--md-primary), var(--md-secondary));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-role { font-size: clamp(1.1rem, 2.6vw, 1.5rem); font-weight: 500; color: var(--md-on-surface-variant); min-height: 1.6em; }
.hero-role .typed-cursor { color: var(--md-primary); }
.hero p.lead { margin: 20px 0 30px; font-size: 1.08rem; color: var(--md-on-surface-variant); max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-socials { display: flex; gap: 8px; margin-top: 28px; }
.hero-socials a {
  width: 46px; height: 46px; border-radius: var(--radius-full);
  display: grid; place-items: center;
  background: var(--md-surface); box-shadow: var(--elev-1);
  color: var(--md-on-surface-variant); transition: all .2s ease;
}
.hero-socials a:hover { color: var(--md-primary); transform: translateY(-3px); box-shadow: var(--elev-2); }
.hero-socials svg { width: 22px; height: 22px; fill: currentColor; }

.hero-photo { justify-self: center; position: relative; }
.hero-photo .ring {
  position: relative; width: min(340px, 72vw); aspect-ratio: 1;
  border-radius: 50%; padding: 6px;
  background: linear-gradient(135deg, var(--md-primary), var(--md-secondary));
  box-shadow: var(--elev-4);
}
.hero-photo img { border-radius: 50%; background: var(--md-surface); }
.floating-chip {
  position: absolute; display: flex; align-items: center; gap: 8px;
  background: var(--md-surface); box-shadow: var(--elev-3);
  padding: 10px 16px; border-radius: var(--radius-full);
  font-size: .85rem; font-weight: 600;
  animation: float 4s ease-in-out infinite;
}
.floating-chip .material-symbols-rounded { color: var(--md-primary); font-size: 20px; }
.chip-1 { top: 12%; left: -8%; }
.chip-2 { bottom: 16%; right: -10%; animation-delay: 1.5s; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero p.lead { margin-inline: auto; }
  .hero-cta, .hero-socials { justify-content: center; }
  .hero-status { margin-inline: auto; }
  .hero-photo { order: -1; }
  .chip-1 { left: 0; }
  .chip-2 { right: 0; }
}

/* ---------- Stats strip ---------- */
.stats { background: var(--md-surface); border-block: 1px solid var(--md-outline-variant); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 48px 0; }
.stat { text-align: center; }
.stat .num { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 700; color: var(--md-primary); font-family: var(--font-mono); letter-spacing: -.03em; }
.stat .label { font-size: .9rem; color: var(--md-on-surface-variant); font-weight: 500; }
@media (max-width: 640px) { .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; } }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about-grid p { color: var(--md-on-surface-variant); margin-bottom: 16px; font-size: 1.05rem; }
.about-facts { display: grid; gap: 14px; margin-top: 8px; }
.fact { display: flex; align-items: center; gap: 14px; padding: 16px 18px; background: var(--md-surface); border-radius: var(--radius-md); box-shadow: var(--elev-1); }
.fact .material-symbols-rounded { color: var(--md-primary); background: var(--md-primary-container); color: var(--md-on-primary-container); width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; flex-shrink: 0; }
.fact .k { font-size: .78rem; color: var(--md-on-surface-variant); text-transform: uppercase; letter-spacing: .05em; }
.fact .v { font-weight: 600; }
.fact a.v:hover { color: var(--md-primary); }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; gap: 36px; } }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.skill-card { background: var(--md-surface); border-radius: var(--radius-md); padding: 24px; box-shadow: var(--elev-1); border: 1px solid var(--md-outline-variant); transition: box-shadow .25s ease, transform .25s ease; }
.skill-card:hover { box-shadow: var(--elev-3); transform: translateY(-3px); }
.skill-card h3 { display: flex; align-items: center; gap: 10px; font-size: 1.05rem; margin-bottom: 16px; }
.skill-card h3 .material-symbols-rounded { color: var(--md-primary); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: .85rem; font-weight: 500; padding: 7px 14px;
  border-radius: var(--radius-full);
  background: var(--md-surface-2); color: var(--md-on-surface-variant);
  border: 1px solid var(--md-outline-variant);
  transition: all .2s ease;
}
.chip:hover { background: var(--md-primary-container); color: var(--md-on-primary-container); border-color: transparent; }
@media (max-width: 720px) { .skills-grid { grid-template-columns: 1fr; } }

/* ---------- Experience timeline ---------- */
.timeline { position: relative; max-width: 860px; margin: 0 auto; }
.timeline::before { content: ""; position: absolute; left: 22px; top: 8px; bottom: 8px; width: 2px; background: var(--md-outline-variant); }
.tl-item { position: relative; padding: 0 0 40px 64px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute; left: 12px; top: 4px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--md-surface); border: 3px solid var(--md-primary);
  display: grid; place-items: center; z-index: 1;
}
.tl-dot::after { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--md-primary); }
.tl-card { background: var(--md-surface); border-radius: var(--radius-md); padding: 24px 26px; box-shadow: var(--elev-1); border: 1px solid var(--md-outline-variant); transition: box-shadow .25s ease; }
.tl-card:hover { box-shadow: var(--elev-2); }
.tl-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; align-items: baseline; margin-bottom: 6px; }
.tl-role { font-size: 1.2rem; font-weight: 700; }
.tl-date { font-family: var(--font-mono); font-size: .82rem; color: var(--md-primary); font-weight: 500; white-space: nowrap; }
.tl-co { font-weight: 600; color: var(--md-secondary); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tl-co .loc { color: var(--md-on-surface-variant); font-weight: 400; font-size: .9rem; }
.tl-list { display: grid; gap: 10px; }
.tl-list li { position: relative; padding-left: 22px; color: var(--md-on-surface-variant); font-size: .98rem; }
.tl-list li::before { content: "chevron_right"; font-family: 'Material Symbols Rounded'; position: absolute; left: -2px; top: 1px; color: var(--md-primary); font-size: 18px; }
.tl-list strong { color: var(--md-on-surface); font-weight: 600; }
@media (max-width: 560px) { .tl-item { padding-left: 52px; } .tl-card { padding: 20px; } }

/* ---------- Projects ---------- */
.proj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.proj-card {
  display: flex; flex-direction: column;
  background: var(--md-surface); border-radius: var(--radius-md);
  padding: 28px; box-shadow: var(--elev-1); border: 1px solid var(--md-outline-variant);
  transition: box-shadow .25s ease, transform .25s ease;
  position: relative; overflow: hidden;
}
.proj-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: linear-gradient(90deg, var(--md-primary), var(--md-secondary));
  transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.proj-card:hover { box-shadow: var(--elev-3); transform: translateY(-4px); }
.proj-card:hover::before { transform: scaleX(1); }
.proj-icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: var(--md-primary-container); color: var(--md-on-primary-container); margin-bottom: 18px; }
.proj-icon .material-symbols-rounded { font-size: 28px; }
.proj-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.proj-meta { font-family: var(--font-mono); font-size: .78rem; color: var(--md-secondary); margin-bottom: 12px; }
.proj-card p { color: var(--md-on-surface-variant); font-size: .96rem; margin-bottom: 16px; flex-grow: 1; }
.proj-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 16px; }
.proj-tags span { font-size: .76rem; font-family: var(--font-mono); padding: 4px 10px; border-radius: var(--radius-full); background: var(--md-surface-2); color: var(--md-on-surface-variant); }
.proj-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--md-primary); font-size: .92rem; align-self: flex-start; }
.proj-link .material-symbols-rounded { font-size: 18px; transition: transform .2s ease; }
.proj-card:hover .proj-link .material-symbols-rounded { transform: translate(2px, -2px); }
.proj-more { text-align: center; margin-top: 40px; }
@media (max-width: 720px) { .proj-grid { grid-template-columns: 1fr; } }

/* ---------- Awards ---------- */
.awards-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.award {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--md-surface); border-radius: var(--radius-md);
  padding: 26px; box-shadow: var(--elev-1); border: 1px solid var(--md-outline-variant);
}
.award .medal { width: 54px; height: 54px; border-radius: 14px; display: grid; place-items: center; flex-shrink: 0; background: linear-gradient(135deg, var(--md-tertiary), var(--md-primary)); color: #fff; }
.award .medal .material-symbols-rounded { font-size: 30px; }
.award h3 { font-size: 1.08rem; margin-bottom: 4px; }
.award .org { color: var(--md-secondary); font-weight: 600; font-size: .92rem; }
.award p { color: var(--md-on-surface-variant); font-size: .92rem; margin-top: 6px; }
@media (max-width: 640px) { .awards-grid { grid-template-columns: 1fr; } }

/* ---------- Contact ---------- */
.contact { background: var(--md-surface); border-top: 1px solid var(--md-outline-variant); }
.contact-card {
  max-width: 760px; margin: 0 auto; text-align: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--md-primary) 12%, var(--md-surface)), var(--md-surface));
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg); padding: clamp(36px, 6vw, 64px);
  box-shadow: var(--elev-2);
}
.contact-card h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 12px; }
.contact-card p { color: var(--md-on-surface-variant); font-size: 1.08rem; margin-bottom: 28px; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.contact-socials { display: flex; gap: 10px; justify-content: center; margin-top: 32px; }
.contact-socials a { width: 48px; height: 48px; border-radius: var(--radius-full); display: grid; place-items: center; background: var(--md-surface); box-shadow: var(--elev-1); color: var(--md-on-surface-variant); transition: all .2s ease; }
.contact-socials a:hover { color: var(--md-primary); transform: translateY(-3px); box-shadow: var(--elev-2); }
.contact-socials svg { width: 22px; height: 22px; fill: currentColor; }

/* ---------- Footer ---------- */
footer { background: var(--md-background); padding: 32px 0; border-top: 1px solid var(--md-outline-variant); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; color: var(--md-on-surface-variant); font-size: .9rem; }
.footer-inner .brand { font-size: 1rem; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 48px; height: 48px; border-radius: 14px;
  background: var(--md-primary); color: var(--md-on-primary);
  display: grid; place-items: center; box-shadow: var(--elev-3);
  opacity: 0; pointer-events: none; transform: translateY(16px);
  transition: all .3s ease; cursor: pointer; border: none;
}
.to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top:hover { background: var(--md-primary-hover); }

/* ---------- Scroll reveal ---------- */
/* Only hide when JS is confirmed running, so the page never stays blank if JS fails. */
html.js .reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
html.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}