/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --c-bg:          #f7f6f3;
  --c-surface:     #ffffff;
  --c-border:      #d8d5cf;
  --c-border-lt:   #e8e6e1;

  --c-ink:         #111110;
  --c-ink-2:       #3a3935;
  --c-ink-3:       #6b6a65;
  --c-ink-4:       #9a9891;

  --c-blue:        #1a4fd6;
  --c-blue-dk:     #1240b0;
  --c-blue-lt:     #e8eefb;

  --c-green:       #2a7a4b;
  --c-green-lt:    #e6f3ec;

  --c-accent:      #c8410a;   /* warm red – used very sparingly */

  --font-sans:     'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --radius-sm:     2px;
  --radius:        4px;

  --header-h:      56px;

  --transition:    160ms ease;
}

/* ============================================================
   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(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 0.9375rem;      /* 15px */
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ============================================================
   TYPOGRAPHY SCALE
   ============================================================ */
h1, h2, h3, h4 { font-weight: 600; line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 500; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 600; }

/* ============================================================
   LAYOUT HELPERS
   ============================================================ */
.container {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
  z-index: 1000;
}

#site-header.is-scrolled {
  border-bottom-color: var(--c-border);
  box-shadow: 0 1px 12px rgba(0,0,0,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.nav-brand {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-blue);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  margin-left: 0.5rem;
  flex: 1;
}

.nav-links a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-ink-3);
  text-transform: uppercase;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--c-blue);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.is-active          { color: var(--c-ink); }
.nav-links a:hover::after,
.nav-links a.is-active::after   { width: 100%; }

#lang-toggle {
  margin-left: auto;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-ink-2);
  border-radius: var(--radius-sm);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

#lang-toggle:hover {
  background: var(--c-blue-lt);
  border-color: var(--c-blue);
  color: var(--c-blue);
}

/* ============================================================
   HERO
   ============================================================ */
#hero {
  padding-top: calc(var(--header-h) + 5rem);
  padding-bottom: 5rem;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
  max-width: 1180px;
  margin-inline: auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  grid-template-rows: auto;
  gap: 3rem 5rem;
  align-items: center;
}

.hero-content {
  grid-column: 1;
  padding-top: 1rem;
}

.hero-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-blue);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-label::before {
  content: '';
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  background: var(--c-blue);
  flex-shrink: 0;
}

.hero-name {
  color: var(--c-ink);
  margin-bottom: 1.5rem;
}

.hero-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-ink-2);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 0.875rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn--primary {
  background: var(--c-blue);
  color: #fff;
  border-color: var(--c-blue);
}
.btn--primary:hover {
  background: var(--c-blue-dk);
  border-color: var(--c-blue-dk);
}

.btn--ghost {
  background: transparent;
  color: var(--c-ink);
  border-color: var(--c-border);
}
.btn--ghost:hover {
  border-color: var(--c-ink-2);
  background: var(--c-surface);
}

.btn--social {
  background: transparent;
  color: var(--c-ink-3);
  border-color: var(--c-border-lt);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}
.btn--social:hover {
  border-color: var(--c-blue);
  color: var(--c-blue);
  background: var(--c-blue-lt);
}

/* Hero photo */
.hero-photo-col {
  grid-column: 2;
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
}

.hero-photo-frame {
  position: relative;
  width: 100%;
  max-width: 300px;
  flex-shrink: 0;
}

.hero-photo-frame::before {
  content: '';
  position: absolute;
  inset: -6px -6px 6px 6px;
  border: 1px solid var(--c-blue);
  border-radius: var(--radius-sm);
  z-index: 0;
}

.hero-photo {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  max-width: 300px;
  display: block;
  object-fit: cover;
  object-position: top center;
  border-radius: var(--radius-sm);
  filter: grayscale(8%);
}

/* ============================================================
   SECTION SHARED
   ============================================================ */
section {
  padding-block: 5rem;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
  max-width: 1180px;
  margin-inline: auto;
}

.section-intro {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 1.25rem;
}

.section-index {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-ink-4);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

/* ============================================================
   PROJECTS
   ============================================================ */
#projects {
  background: var(--c-bg);
}

.project {
  border-top: 1px solid var(--c-border-lt);
  padding-block: 3rem;
}

.project:first-of-type { border-top: none; }

/* project header row */
.project-header {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0 1.5rem;
  align-items: start;
  margin-bottom: 2rem;
}

.project-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--c-ink-4);
  letter-spacing: 0.08em;
  padding-top: 0.4rem;
}

.project-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.tag--blue {
  background: var(--c-blue-lt);
  color: var(--c-blue);
}

.tag--gray {
  background: #ebebea;
  color: var(--c-ink-3);
}

.tag--green {
  background: var(--c-green-lt);
  color: var(--c-green);
}

.project-name {
  color: var(--c-ink);
}

.project-name em {
  font-style: normal;
  font-weight: 400;
  color: var(--c-ink-3);
}

/* project body */
.project-body {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0 1.5rem;
}

/* push content past the num gutter */
.project-left {
  grid-column: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 3rem;
  align-items: start;
}

.project-left--wide {
  grid-template-columns: 1fr;
  max-width: 640px;
}

.project-gallery {
  grid-column: 2;
  margin-top: 0;
}

/* SeatFindr — stacked layout: text row, then full-width gallery row */
.project#seatfindr .project-body {
  grid-template-columns: 56px 1fr;
  grid-template-rows: auto auto;
}

.project#seatfindr .project-left {
  grid-column: 2;
  grid-row: 1;
  grid-template-columns: 1fr;
}

.project#seatfindr .project-image-row {
  grid-column: 2;
  grid-row: 2;
}

/* Campus Events — video row below text */
.project#campus-events .project-body {
  grid-template-columns: 56px 1fr;
  grid-template-rows: auto auto;
}

.project#campus-events .project-left {
  grid-column: 2;
  grid-row: 1;
}

/* TaskSplit — stacked layout */
.project#tasksplit .project-body {
  grid-template-columns: 56px 1fr;
  grid-template-rows: auto auto;
}

.project#tasksplit .project-left {
  grid-column: 2;
  grid-row: 1;
}

.project#tasksplit .project-image-row {
  grid-column: 2;
  grid-row: 2;
}

.project#tasksplit .project-image-row img {
  max-width: 220px;
}

/* Hovercraft — stacked layout */
.project#hovercraft .project-body {
  grid-template-columns: 56px 1fr;
  grid-template-rows: auto auto;
}

.project#hovercraft .project-left {
  grid-column: 2;
  grid-row: 1;
}

.project#hovercraft .project-image-row {
  grid-column: 2;
  grid-row: 2;
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--c-ink-2);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.feature-list {
  margin-bottom: 1.5rem;
}

.feature-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.875rem;
  color: var(--c-ink-2);
  line-height: 1.65;
  margin-bottom: 0.5rem;
}

.feature-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--c-green);
  font-weight: 700;
}

/* Tech stack pills */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-stack span {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-ink-2);
  border-radius: var(--radius-sm);
}

/* ============================================================
   PROJECT IMAGE ROW
   ============================================================ */
.project-image-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.5rem;
  width: 100%;
  justify-content: flex-start;
}

.project-image-row img {
  height: 300px;
  width: auto;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  object-fit: contain;
  display: block;
  background-color: #ffffff;
  cursor: zoom-in;
  transition: box-shadow var(--transition);
}

.project-image-row img:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

/* Campus Events — demo link */
.project-demo-link {
  grid-column: 2;
  grid-row: 2;
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.demo-note {
  font-size: 0.78rem;
  font-style: italic;
  color: var(--c-ink-4);
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9000;
  cursor: zoom-out;
  padding: 2rem;
  animation: lb-in 160ms ease;
}

#lightbox.hidden {
  display: none;
}

@keyframes lb-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

#lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 60px rgba(0, 0, 0, 0.5);
  cursor: default;
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  border-top: 1px solid var(--c-border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 5rem;
  align-items: start;
}

.contact-text {
  max-width: 380px;
}

.contact-text p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-ink-2);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.contact-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.875rem;
  border-bottom: 1px solid var(--c-border-lt);
  transition: background var(--transition);
}

.contact-link:first-child { border-top: 1px solid var(--c-border-lt); }

.contact-link:hover .contact-link-value { color: var(--c-blue); }

.contact-link-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-ink-4);
  flex-shrink: 0;
}

.contact-link-value {
  font-size: 0.875rem;
  color: var(--c-ink);
  transition: color var(--transition);
  text-align: right;
}

/* ============================================================
   FOOTER
   ============================================================ */
#site-footer {
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem clamp(1.25rem, 4vw, 3rem);
  max-width: 1180px;
  margin-inline: auto;
  font-size: 0.75rem;
  color: var(--c-ink-4);
}

.footer-name  { font-weight: 600; color: var(--c-ink-2); }
.footer-sep   { color: var(--c-border); }

/* ============================================================
   SCROLLBAR (subtle, webkit only)
   ============================================================ */
::-webkit-scrollbar       { width: 5px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 99px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-photo-col {
    grid-column: 1;
    order: -1;
    justify-content: flex-start;
  }

  .hero-photo-frame {
    width: 180px;
    height: 220px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  .nav-links { display: none; }

  .hero-grid   { gap: 2rem; }
  .hero-label  { font-size: 0.7rem; }

  .project-header,
  .project-body {
    grid-template-columns: 1fr;
  }

  .project-num   { display: none; }
  .project-left  { grid-column: 1; }

  .project-image-row img { height: 160px; }

  .contact-link { flex-direction: column; gap: 0.15rem; }
  .contact-link-value { text-align: left; }
}