/* =====================================================================
   TAWFIQ MAHUMUD KHAN — SolidWorks Portfolio
   Professional, clean, engineering-portfolio design
   ===================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --color-bg:        #0f1623;
  --color-bg-alt:    #131c2d;
  --color-surface:   #1a2436;
  --color-surface-2: #22304a;
  --color-border:    #2a3a55;
  --color-text:      #e6ecf5;
  --color-text-dim:  #9ba9bf;
  --color-accent:    #4f8bff;
  --color-accent-2:  #6aa3ff;
  --color-success:   #4ec9b0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 60px rgba(0, 0, 0, 0.45);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --container:    1320px;
  --container-sm: 1040px;
  --transition:   200ms ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* Safety net: stop accidental horizontal scroll caused by fixed-width
   descendants, gradients, or wide inline content on small phones. The
   site has overflow:hidden on the hero but other sections (e.g. the
   long LinkedIn URL in contact cards, decorative gradients) can still
   push the page wider than the viewport if not contained. */
html, body { overflow-x: hidden; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

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

.section {
  padding: 96px 0;
}
.section--alt { background: var(--color-bg-alt); }

.section-header {
  margin-bottom: 48px;
}
.section-header__eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  font-weight: 600;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: #fff;
}
.section-subtitle {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-dim);
  max-width: 100%;
  margin: 0 0 32px;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
  opacity: 0.95;
}
.section-title small {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-dim);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  max-width: 1240px;
  margin: 0 auto;
}
.about-grid__lead { min-width: 0; }
.about-lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text-dim);
  margin: 0 0 18px;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}
.about-lede:last-child { margin-bottom: 0; }
.about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.about-stat:hover {
  transform: translateY(-2px);
  border-color: rgba(79, 139, 255, 0.45);
  background: rgba(79, 139, 255, 0.06);
}
.about-stat__num {
  font-size: clamp(26px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text-dim);
}
@media (max-width: 880px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 22, 35, 0.85);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border);
  /* Push the sticky bar away from notches / camera cutouts on iOS and
     Android so the brand and toggle aren't clipped on the edges. */
  padding-left:  env(safe-area-inset-left, 0);
  padding-right: env(safe-area-inset-right, 0);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* If the device has a top notch (iPhone X+, landscape phones etc.)
     push the bar contents down so the brand sits inside the safe area
     rather than under the notch. */
  padding-left:  max(env(safe-area-inset-left, 0), 0);
  padding-right: max(env(safe-area-inset-right, 0), 0);
  height: 64px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 15px;
}
.nav__brand-mark {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
}
.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav__links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-dim);
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav__links a:hover,
.nav__links a.is-active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 96px;
  background:
    radial-gradient(circle at 80% -10%, rgba(79,139,255,0.18), transparent 60%),
    radial-gradient(circle at 10% 110%, rgba(78,201,176,0.10), transparent 60%),
    var(--color-bg);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, black 40%, transparent 90%);
  -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 90%);
}
.hero__inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
}
.hero__copy { max-width: 760px; }

/* Two-column hero on wide screens: copy on the left, profile portrait
   on the right. Stacks on narrow screens (the portrait is hidden so
   the copy fills the full width). The narrower inner max-width keeps
   the hero from feeling stretched across the full container. */
@media (min-width: 980px) {
  .hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }
}

/* Profile portrait — pinned to the right column on wide screens.
   Sized to feel like a polished framed photo, never competing with
   the hero copy. Hidden on narrow screens to keep the layout clean. */
.hero__portrait {
  margin: 0;
  justify-self: end;
  width: clamp(220px, 28vw, 320px);
  aspect-ratio: 4 / 5;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 18px 56px rgba(0, 0, 0, 0.5);
  background: var(--color-bg-alt);
  display: none;
}
@media (min-width: 980px) {
  .hero__portrait { display: block; }
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  font-weight: 600;
  padding: 6px 12px;
  border: 1px solid rgba(79,139,255,0.3);
  border-radius: 999px;
  margin-bottom: 24px;
}
.hero__eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 0 rgba(78,201,176,0.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(78,201,176,0.5); }
  70%  { box-shadow: 0 0 0 8px rgba(78,201,176,0); }
  100% { box-shadow: 0 0 0 0 rgba(78,201,176,0); }
}
.hero__title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  color: #fff;
}
.hero__title-text {
  display: inline-block;
  max-width: 100%;
}
/* Lock the name to a single line only when there's room. On phones the
   36-64px clamp can't fit "Tawfiq Mahumud Khan" without horizontal
   overflow, so we let the title wrap below 720px and only nowrap from
   tablet/desktop upwards. */
@media (min-width: 720px) {
  .hero__title-text {
    white-space: nowrap;
  }
}
.hero__subtitle {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--color-text-dim);
  max-width: 760px;
  margin: 0 0 32px;
}
.hero__cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.01em;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover { background: var(--color-accent-2); }
.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn--ghost:hover {
  border-color: var(--color-accent);
  color: #fff;
}

/* ---------- Skills strip ---------- */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 56px;
}
.skill {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  transition: border-color var(--transition), transform var(--transition);
}
.skill:hover { border-color: var(--color-accent); transform: translateY(-2px); color: #fff; }
.skill:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.skill__icon {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  background: rgba(79,139,255,0.12);
  color: var(--color-accent-2);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
}
.skill--cert { border-color: rgba(78,201,176,0.35); }
.skill--cert .skill__icon {
  background: rgba(78,201,176,0.15);
  color: var(--color-success);
}

/* ---------- Project grid ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.project-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.project-card__link {
  display: block;
  color: inherit;
}

.project-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    linear-gradient(135deg, #1c2638 0%, #0f1623 100%);
}
.project-card__gif,
.project-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms ease;
}
.project-card:hover .project-card__gif,
.project-card:hover .project-card__cover { transform: scale(1.04); }
.project-card__gif--missing,
.project-card__cover--missing { opacity: 0; }
.project-card__missing {
  position: absolute;
  inset: 0;
  display: grid; place-items: center;
  font-size: 13px;
  color: var(--color-text-dim);
  text-align: center;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  margin: 16px;
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(180deg, rgba(15,22,35,0) 40%, rgba(15,22,35,0.85) 100%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.project-card:hover .project-card__overlay,
.project-card__overlay.is-visible { opacity: 1; pointer-events: auto; }

.project-card__cta {
  background: var(--color-accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transform: translateY(8px);
  transition: transform var(--transition);
  box-shadow: var(--shadow-md);
}
.project-card:hover .project-card__cta,
.project-card__overlay.is-visible .project-card__cta { transform: translateY(0); }

.project-card__body { padding: 22px 24px 26px; }
.project-card__index {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-accent-2);
  font-weight: 700;
  margin-bottom: 6px;
}
.project-card__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.project-card__summary {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--color-text-dim);
  line-height: 1.55;
}
.project-card__more {
  font-size: 13px;
  color: var(--color-accent-2);
  font-weight: 600;
}

/* ---------- Gallery (Different Projects) ----------
   Files grouped by leading "NN-" prefix; each group renders as a
   labelled block with its own 3-col grid (wrapping to 2 / 1 col).
   --------------------------------------------------------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.gallery-list { display: block; }

.gallery-group {
  margin-bottom: 56px;
}
.gallery-group:last-child { margin-bottom: 0; }

.gallery-group__header {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.gallery-group__index {
  font-size: 12px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--color-accent-2);
  background: rgba(79, 139, 255, 0.10);
  padding: 4px 10px;
  border-radius: 999px;
}
.gallery-group__title {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  flex: 1 1 auto;
}
.gallery-group__count {
  font-size: 13px;
  color: var(--color-text-dim);
  font-weight: 500;
}

.gallery-grid--videos { margin-top: 24px; }

.gallery-card {
  position: relative;
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: zoom-in;
  transition: border-color var(--transition),
              transform var(--transition),
              box-shadow var(--transition);
  aspect-ratio: 4 / 3;
}
.gallery-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.gallery-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms ease;
}
.gallery-card:hover .gallery-card__img { transform: scale(1.05); }

.gallery-card--video {
  cursor: default;
  aspect-ratio: 16 / 9;
}
.gallery-card--video:hover {
  /* No lift/zoom — autoplaying videos shouldn't react to hover. */
  border-color: var(--color-border);
  transform: none;
  box-shadow: none;
}
.gallery-card__video {
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
}

.gallery-card__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 14px 16px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, rgba(15,22,35,0) 0%, rgba(15,22,35,0.85) 100%);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
}
.gallery-card:hover .gallery-card__caption,
.gallery-card:focus-visible .gallery-card__caption {
  opacity: 1;
  transform: translateY(0);
}
/* For looping-video cards the caption is always visible so users can tell
   which file is playing without pausing. */
.gallery-card--video .gallery-card__caption {
  opacity: 1;
  transform: none;
  padding: 10px 14px;
  font-size: 12px;
}

.gallery-card--missing {
  display: grid;
  place-items: center;
  grid-column: 1 / -1;
  aspect-ratio: 4 / 3;
  font-size: 13px;
  color: var(--color-text-dim);
  text-align: center;
  border: 2px dashed var(--color-border);
  cursor: default;
}
.gallery-card--missing small {
  display: block;
  margin-top: 6px;
  opacity: 0.8;
}
.gallery-card--missing:hover {
  border-color: var(--color-border);
  transform: none;
  box-shadow: none;
}

@media (max-width: 900px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

/* ---------- Project detail page ---------- */
.project-hero {
  padding: 60px 0 32px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}
.back-link {
  font-size: 14px;
  color: var(--color-text-dim);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 24px;
  transition: color var(--transition);
}
.back-link:hover { color: var(--color-accent-2); }

.project-hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
  color: #fff;
}
.project-hero__summary {
  font-size: 18px;
  color: var(--color-text-dim);
  max-width: 100%;
  margin: 0;
}
.project-hero__description {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  max-width: 100%;
  margin: 20px 0 0;
  opacity: 0.92;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}
.project-hero__highlights {
  margin-top: 28px;
  padding: 22px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  max-width: 100%;
}
.project-hero__highlights h3 {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-2);
}
.project-hero__highlights ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 8px 24px;
}
.project-hero__highlights li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
}
.project-hero__highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-accent);
}

.project-section { padding: 48px 0; }
.project-section + .project-section { border-top: 1px solid var(--color-border); }

.project-hero__media {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  /* Overview GIF is roughly 794x720 (≈1.1:1). Use a tall friendly ratio so
     the GIF shows at a comfortable size without excessive letterboxing.
     Image uses object-fit: contain so it never gets cropped. */
  aspect-ratio: 10 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.project-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ---------- Assembly & Exploded View cards ---------- */
.view-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 8px;
}
.view-card {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition);
}
.view-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.view-card__media {
  width: 100%;
  /* Wider aspect ratio (16:9) so each video card has a generous viewing
     area for the piston / exploded animations. Combined with the single-
     column .view-grid above, each card spans the full row. */
  aspect-ratio: 16 / 9;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.view-card__media img,
.view-card__media video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: var(--color-bg-alt);
}
.view-card__caption {
  padding: 14px 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--color-border);
}
.view-card__label {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.01em;
}
.view-card__hint {
  font-size: 13px;
  color: var(--color-text-dim);
  line-height: 1.4;
}

.components-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}
.component-card {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
  cursor: zoom-in;
}
.component-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.component-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.component-card figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-border);
}

.placeholder-box {
  display: grid; place-items: center;
  text-align: center;
  padding: 24px;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-dim);
  font-size: 14px;
  height: 100%;
  min-height: 180px;
}
.placeholder-box--small { min-height: 120px; font-size: 12px; }
.placeholder-box small {
  display: block;
  margin-top: 8px;
  color: var(--color-text-dim);
  opacity: 0.7;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}

/* ---------- 3D model viewer ---------- */
.model-viewers {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.model-wrapper {
  background: #1a1f2b;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}
.model-canvas-host {
  position: relative;
  width: 100%;
  height: 480px;
  background: #1a1f2b;
  overflow: hidden;
}
.model-canvas-host canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
.model-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 14px;
}
.model-overlay__hint {
  align-self: flex-end;
  padding: 6px 10px;
  background: rgba(15, 18, 28, 0.78);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-text-dim);
  backdrop-filter: blur(6px);
}
.model-overlay__loading {
  align-self: center;
  margin: auto;
  padding: 10px 16px;
  background: rgba(15, 18, 28, 0.85);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 13px;
  color: var(--color-text);
  font-weight: 500;
  letter-spacing: 0.02em;
  animation: model-pulse 1.6s ease-in-out infinite;
}
@keyframes model-pulse {
  0%, 100% { opacity: 0.55; }
  50%      { opacity: 1; }
}
.model-wrapper model-viewer {
  display: block;
  background: #1a1f2b;
}
.model-wrapper--primary {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(79,139,255,0.35), 0 10px 30px rgba(79,139,255,0.12);
}
.model-grid-secondary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.model-label {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 6px 10px;
  background: rgba(15, 18, 28, 0.78);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  pointer-events: none;
  z-index: 2;
}
.model-fallback {
  padding: 20px;
  text-align: center;
  color: var(--color-text-dim);
  font-size: 14px;
  background: rgba(15, 22, 35, 0.85);
}
.model-fallback[hidden] { display: none; }
.model-fallback a {
  color: var(--color-accent-2);
  text-decoration: underline;
}

/* ---------- Thumbnail grid (click-to-swap) ---------- */
.model-thumbnails {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}
.model-thumb {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: left;
  color: var(--color-text);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--transition),
              background var(--transition),
              transform var(--transition),
              box-shadow var(--transition);
}
.model-thumb:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-2);
  transform: translateY(-1px);
}
.model-thumb:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(79, 139, 255, 0.25);
}
.model-thumb.is-active {
  border-color: var(--color-accent);
  background: rgba(79, 139, 255, 0.12);
  box-shadow: 0 0 0 1px rgba(79, 139, 255, 0.35) inset;
}
.model-thumb__index {
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-accent-2);
  background: rgba(79, 139, 255, 0.12);
  border: 1px solid rgba(79, 139, 255, 0.25);
  border-radius: 6px;
}
.model-thumb.is-active .model-thumb__index {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.model-thumb__label {
  flex: 1;
  min-width: 0;
  font-weight: 500;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.model-thumb.is-active .model-thumb__label {
  color: #fff;
  font-weight: 600;
}

/* ---------- Download list ---------- */
.download-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

/* Sub-section titles inside the download section. They make it
   visually obvious that the .sldprt files and the .stl files are
   two separate categories — not duplicates of each other. */
.download-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin: 28px 0 14px;
}
.download-group-title:first-child { margin-top: 8px; }
.download-group-title__chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 999px;
  background: rgba(79, 139, 255, 0.14);
  color: var(--color-accent-2);
  border: 1px solid rgba(79, 139, 255, 0.3);
}
.download-group-title--sld .download-group-title__chip {
  background: rgba(78, 201, 176, 0.14);
  color: var(--color-success);
  border-color: rgba(78, 201, 176, 0.3);
}
.download-group-title--stl .download-group-title__chip {
  background: rgba(79, 139, 255, 0.14);
  color: var(--color-accent-2);
  border-color: rgba(79, 139, 255, 0.3);
}
.download-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.download-card:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-2);
  transform: translateY(-2px);
}
.download-card__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: rgba(79,139,255,0.12);
  color: var(--color-accent-2);
  border-radius: 8px;
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.download-card__icon--image {
  background: var(--color-bg-alt);
  padding: 0;
}
.download-card__icon--image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.download-card__body { flex: 1; min-width: 0; }
.download-card__name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.download-card__meta {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
  margin-top: 2px;
  font-weight: 600;
}
.download-card__cta {
  font-size: 12px;
  color: var(--color-accent-2);
  font-weight: 700;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.download-card--missing {
  border-style: dashed;
  background: transparent;
  cursor: default;
}
.download-card--missing:hover {
  border-color: var(--color-border);
  background: transparent;
  transform: none;
}

/* ---------- Pager ---------- */
.project-pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(8, 12, 20, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 32px;
}
.lightbox.is-open { display: flex; }
.lightbox__img {
  max-width: 92vw;
  max-height: 88vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.lightbox__close {
  position: absolute;
  top: 20px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: none;
  font-size: 24px;
  display: grid; place-items: center;
  transition: background var(--transition);
}
.lightbox__close:hover { background: rgba(255,255,255,0.2); }

/* ---------- Contact ---------- */
/* Centered header variant for the Contact section (no intro paragraph,
   no name — just eyebrow + section title above the cards). */
.section-header--center {
  text-align: center;
  margin-bottom: 48px;
}
.section-header--center .section-header__eyebrow {
  display: inline-block;
  margin-bottom: 12px;
}

/* 5-card grid: 3 across on desktop, 2 across on tablet, 1 on mobile.
   Each card is a full-bleed link to the relevant external channel. */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
}
@media (max-width: 900px) {
  .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 22px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition),
              border-color var(--transition),
              background var(--transition),
              box-shadow var(--transition);
}
/* Subtle gradient strip along the left edge — picked up per-channel
   via a modifier class. */
.contact-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--card-accent, var(--color-accent));
  opacity: 0.7;
  transition: opacity var(--transition), width var(--transition);
}
.contact-card:hover {
  transform: translateY(-3px);
  border-color: var(--card-accent, var(--color-accent));
  background: var(--color-surface-2);
  box-shadow: var(--shadow-md);
}
.contact-card:hover::before {
  opacity: 1;
  width: 4px;
}
.contact-card:focus-visible {
  outline: 2px solid var(--card-accent, var(--color-accent));
  outline-offset: 3px;
}

.contact-card__icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--card-accent-bg, rgba(79,139,255,0.12));
  color: var(--card-accent, var(--color-accent-2));
  border-radius: 10px;
  flex-shrink: 0;
}
.contact-card__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.contact-card__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  font-weight: 700;
}
.contact-card__value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 600;
  word-break: break-word;
  line-height: 1.35;
}
.contact-card__cta {
  margin-top: auto;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--card-accent, var(--color-accent-2));
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition), transform var(--transition);
}
.contact-card:hover .contact-card__cta,
.contact-card:focus-visible .contact-card__cta {
  opacity: 1;
  transform: translateY(0);
}

/* Per-channel brand colors. */
.contact-card--email      { --card-accent: #4f8bff; --card-accent-bg: rgba(79,139,255,0.14); }
.contact-card--github     { --card-accent: #c9d1d9; --card-accent-bg: rgba(255,255,255,0.06); }
.contact-card--linkedin   { --card-accent: #0a66c2; --card-accent-bg: rgba(10,102,194,0.14); }
.contact-card--facebook   { --card-accent: #1877f2; --card-accent-bg: rgba(24,119,242,0.14); }
.contact-card--whatsapp   { --card-accent: #25d366; --card-accent-bg: rgba(37,211,102,0.14); }

/* ---------- Footer ---------- */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text-dim);
  font-size: 13px;
  text-align: center;
}

/* ---------- Empty / placeholder states ---------- */
.empty {
  text-align: center;
  padding: 96px 24px;
  color: var(--color-text-dim);
}
.empty h2 { color: #fff; margin-bottom: 12px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav__links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    /* Match the safe-area insets so dropdown items aren't clipped by the
       notch on phones with edge-to-edge displays. */
    padding:
      16px
      calc(24px + env(safe-area-inset-right, 0))
      16px
      calc(24px + env(safe-area-inset-left, 0));
    gap: 12px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }
  .nav__links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-toggle { display: inline-flex; }

  .section { padding: 64px 0; }
  .hero { padding: 80px 0 64px; }

  .projects-grid { grid-template-columns: 1fr; }
  .model-viewers { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 56px 0; }
  .hero__title { font-size: 36px; }
  .hero__subtitle { font-size: 16px; margin-bottom: 24px; }
  .hero__cta-row { gap: 10px; }
  .hero__cta-row .btn { flex: 1 1 auto; justify-content: center; }
  .project-hero h1 { font-size: 32px; }
  .skills { grid-template-columns: 1fr; }
  .download-list { grid-template-columns: 1fr; }
  .view-grid { grid-template-columns: 1fr; }
  .project-hero__description { text-align: left; hyphens: none; }
  .section-subtitle { text-align: left; hyphens: none; }
  .section-header { margin-bottom: 32px; }
  /* Tighter stat tiles for very narrow phones. */
  .about-stat { padding: 16px 18px; }
  .about-stat__num { font-size: 26px; }
  .about-stat__label { font-size: 12px; }
  /* Project cards: shrink the cover aspect ratio so each card is shorter
     on a 360-414px phone, keeping the fold clean. */
  .project-card__cover { aspect-ratio: 16 / 10; }
  /* Contact cards: stack content tighter on phones. */
  .contact-card { padding: 18px 18px; gap: 12px; }
  .contact-card__icon { width: 38px; height: 38px; }
  .contact-card__value { font-size: 13px; }
}

/* ---------- Tablet portrait (481-720px) ----------
   Bridges the gap between the master 860px breakpoint (which assumes a
   desktop-ish layout) and the 480px small-phone rules. On a 600-720px
   viewport the hero portrait is too wide to fit comfortably alongside
   the copy, so we hide it and keep the copy full-width. The about-grid
   stays two-column at this width (the 880px breakpoint already handles
   its collapse), but projects / contact / skills get extra polish. */
@media (max-width: 720px) {
  /* Hero portrait hidden until desktop — it's the only way to keep the
     copy + chips readable on portrait tablets. */
  .hero__portrait { display: none; }
  .hero__inner {
    grid-template-columns: 1fr;
    max-width: 640px;
  }
  .hero__copy { max-width: 100%; }

  /* Hero typography scales down slightly. */
  .hero__title { font-size: clamp(32px, 8vw, 48px); }

  /* Skills: smaller min-width so 3-up fits at 600-720px. */
  .skills { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  /* About: stat tiles stay 2-column down to 480px (handled there). */

  /* Contact cards: 1 column already at 560px (gallery rule). Match it
     here so we don't get a weird 2-up at 600px. */
  .contact-grid { grid-template-columns: 1fr; }

  /* Section titles slightly smaller on tablets. */
  .section-title { font-size: clamp(24px, 4vw, 32px); }
}

/* ---------- Sub-projects (Surfacing, etc.) ---------- */
.sub-projects-list {
  display: flex;
  flex-direction: column;
  gap: 80px;
  margin-top: 48px;
}
.sub-project {
  padding: 36px 0 8px;
  border-top: 1px solid var(--color-border);
}
.sub-project:first-child {
  border-top: none;
  padding-top: 0;
}
.sub-project__header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 14px;
}
.sub-project__index {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  background: rgba(79, 139, 255, 0.10);
  border: 1px solid rgba(79, 139, 255, 0.30);
  padding: 4px 10px;
  border-radius: 4px;
}
.sub-project__title {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  color: #fff;
}
.sub-project__description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 100%;
  margin: 0 0 24px;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
  opacity: 0.92;
}
.sub-project__heading {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  margin: 0 0 12px;
}

.sub-project__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}
.sub-project__overview,
.sub-project__viewer {
  display: flex;
  flex-direction: column;
}
.sub-project__media {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sub-project__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.sub-project__canvas-host {
  width: 100%;
  height: 100%;
  min-height: 340px;
  background: #1a1f2b;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  display: block;
}
.sub-project__canvas-host > .model-overlay__hint {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  align-self: auto;
  margin: 0;
  pointer-events: none;
  white-space: nowrap;
  max-width: calc(100% - 24px);
}
.sub-project__canvas-host > canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
.sub-project__label {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-dim);
  letter-spacing: 0.02em;
}
.sub-project__downloads {
  margin-top: 28px;
}
.sub-project__files {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

/* Media-grid variant for gallery sub-projects (no 3D viewer / no downloads).
   Mirrors .sub-project__downloads spacing so the page reads consistently
   whether a sub-project shows downloads or a media gallery. */
.sub-project__media-grid {
  margin-top: 28px;
}

/* Single-video sub-projects render as a full-width hero player so the
   motion can be observed at proper scale. */
.sub-project__hero-video {
  margin-top: 28px;
  width: 100%;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}
.sub-project__hero-video .gallery-card--video {
  width: 100%;
  aspect-ratio: 16 / 9;
}
.sub-project__hero-video .gallery-card__video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ---------- Molding (mould design) layout ----------
   The molding section renders each sub-project as:
     - a looping MP4 hero (replaces the static overview image)
     - a stack of component rows (PNG left, 3D viewer right, downloads below)
   These rules re-use the existing .sub-project__layout, .sub-project__media,
   .sub-project__canvas-host, and .sub-project__files rules — only the
   parts that differ (full-width video, component grouping, dividers)
   need new styles. */

/* Video hero: full-width, capped at 1100px so even large loops stay
   legible on wide monitors. The aspect-ratio locks the height so the
   page doesn't jump while the video buffers. */
.sub-project__overview--video {
  margin-top: 22px;
}
.sub-project__media--video {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 14px;
  overflow: hidden;
  background: #0f1623;
  border: 1px solid rgba(255, 255, 255, 0.08);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mold-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}

/* Component stack: group heading + a series of <div class="mold-component">
   rows. Each row is its own little unit — a header (number + title),
   an image + 3D viewer pair, and download cards. */
.mold-components {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.mold-component {
  padding: 22px;
  border: 1px solid var(--color-border, rgba(255, 255, 255, 0.08));
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
}
.mold-component__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.mold-component__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

/* On narrow screens, stack the component header pieces tighter and let
   the image and 3D viewer fall onto their own rows. */
@media (max-width: 760px) {
  .mold-component {
    padding: 16px;
  }
  .mold-component__title {
    font-size: 16px;
  }
  .sub-project__media--video {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 760px) {
  .sub-project__layout {
    grid-template-columns: 1fr;
  }
  .sub-projects-list {
    gap: 56px;
  }
  .sub-project__description {
    text-align: left;
    hyphens: none;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}