:root {
  /* ===== Theme tokens ===== */
  color-scheme: dark;

  --bg0: #070a12;
  --bg1: #0a1020;
  --bg2: #0b1428;

  --panel: rgba(255, 255, 255, 0.06);
  --panel-strong: rgba(255, 255, 255, 0.09);

  --text: rgba(245, 248, 255, 0.92);
  --muted: rgba(205, 215, 240, 0.72);

  --brand: #7bd6ff; /* icy cyan */
  --brand-2: #a58bff; /* cool violet accent */
  --border: rgba(160, 190, 255, 0.16);

  --shadow: 0 24px 80px rgba(0, 0, 0, 0.55);

  --radius: 18px;
  --container: 1280px;

  /* spacing scale */
  --section-y: 42px;
  --section-y-tight: 26px;

  --hero-y: 34px;
  --page-hero-y: 24px;

  --stack: 16px; /* default vertical rhythm */
  --stack-tight: 10px; /* tightened rhythm for specific pages */
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

html.no-scroll { overflow: hidden; }

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;

  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.55;
  color: var(--text);

  background:
    radial-gradient(900px 700px at 12% 8%, color-mix(in srgb, var(--brand) 18%, transparent), transparent 55%),
    radial-gradient(850px 650px at 88% 16%, color-mix(in srgb, var(--brand-2) 16%, transparent), transparent 60%),
    radial-gradient(700px 600px at 55% 92%, rgba(255, 255, 255, 0.06), transparent 62%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg2) 75%, transparent), transparent 44%),
    linear-gradient(135deg, var(--bg0), var(--bg1));
}

main { flex: 1; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container { width: min(var(--container), 92%); margin: 0 auto; }
.muted { color: var(--muted); }
.tiny { font-size: 0.9rem; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  width: 100%;

  background:
    linear-gradient(to bottom,
      color-mix(in srgb, var(--bg0) 80%, transparent),
      color-mix(in srgb, var(--bg0) 20%, transparent)
    );
  backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;

  /* NEW: keep header height stable (prevents iOS jump when menu opens) */
  min-height: 56px;
}

.logo {
  font-weight: 850;
  letter-spacing: 0.2px;
  padding: 10px 12px;
  border-radius: 12px;
  position: relative;
}
.logo:hover {
  background: color-mix(in srgb, var(--brand) 10%, transparent);
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.nav a {
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color 160ms ease, opacity 160ms ease;
}

.nav a:hover {
  color: var(--text);
}

.nav a.active {
  color: color-mix(in srgb, var(--text) 100%, white 0%);
  opacity: 1;
  background: transparent;
  border-color: transparent;
}

/* ===== Mobile menu ===== */
.mobile-toggle {
  display: none;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  color: var(--text);
  cursor: pointer;
}
.mobile-toggle:hover {
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
}

/* NEW: overlay menu so it doesn't push content down (prevents scroll jump on iPhone) */
.mobile-menu {
  position: fixed;
  left: 0;
  right: 0;
  top: calc(env(safe-area-inset-top, 0px) + 56px); /* header height + iOS safe area */
  z-index: 35;

  background: color-mix(in srgb, var(--bg0) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.mobile-nav {
  width: min(var(--container), 92%);
  margin: 0 auto;
  padding: 12px 0 16px;
  display: grid;
  gap: 10px;
}

.mobile-nav a {
  padding: 12px 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
}

.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(0,0,0,0.55);
  display: none;
}
.mobile-menu-backdrop.open { display: block; }

/* Sections */
.section { padding: var(--section-y) 0; }
.section-head { display: grid; gap: 6px; margin-bottom: 16px; }

.hero { padding: var(--hero-y) 0 22px; }
.page-hero { padding: var(--page-hero-y) 0 14px; }

.hero h1,
.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3.15rem);
  margin: 0 0 10px;
  letter-spacing: -0.03em;
}

.lead {
  color: var(--muted);
  font-size: 1.06rem;
  margin: 0;
}

/* Tight spacing */
.about-tight .page-hero { padding-bottom: 6px; }
.about-tight .section { padding: var(--section-y-tight) 0; }

.projects-tight .page-hero { padding-bottom: 6px; }
.projects-tight .section { padding: var(--section-y-tight) 0; }
.projects-tight .section-head { margin-bottom: 10px; }

.project-tight .page-hero { padding-bottom: 10px; }
.project-tight .section { padding: var(--section-y-tight) 0; }
.project-tight .section-head { margin-bottom: 10px; }

/* Buttons */
.cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.button {
  position: relative;
  isolation: isolate;

  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 750;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;

  border: 1px solid color-mix(in srgb, var(--border) 90%, transparent);
  background:
    linear-gradient(135deg,
      color-mix(in srgb, var(--brand) 18%, transparent),
      color-mix(in srgb, var(--brand-2) 14%, transparent)
    ),
    var(--panel);

  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.22);
  transition: transform 160ms ease, box-shadow 160ms ease, filter 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.28);
  filter: saturate(1.06);
}

.button.ghost {
  background: transparent;
  box-shadow: none;
  border: 1px solid color-mix(in srgb, var(--border) 90%, transparent);
}
.button.ghost:hover {
  background: color-mix(in srgb, var(--brand) 10%, transparent);
}

/* Pills */
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.pill {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 0.95rem;
}

/* Panels */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}

.panel-accent {
  background:
    linear-gradient(135deg,
      color-mix(in srgb, var(--brand) 14%, transparent),
      color-mix(in srgb, var(--brand-2) 10%, transparent)
    ),
    var(--panel);
  border-color: color-mix(in srgb, var(--brand) 22%, var(--border));
}

.panel h2 { margin: 0 0 10px; }
.panel h3 { margin: 14px 0 8px; }
.panel p { margin: 0 0 12px; }
.panel p:last-child { margin-bottom: 0; }
.panel ul { margin: 10px 0 0; padding-left: 18px; }
.panel ul:last-child { margin-bottom: 0; }

/* About toolset */
.toolset-vertical {
  display: grid;
  gap: 12px;
  margin-top: 10px;
}
.toolset-vertical .note {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 85%, transparent);
  border-radius: 14px;
  padding: 12px;
}

/* Tiles */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (min-width: 1280px) {
  .tile-grid { grid-template-columns: repeat(4, 1fr); }
}

.tile {
  display: grid;
  grid-template-rows: auto 1fr;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 80%, transparent);
  overflow: hidden;
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.18);
  transition: transform 170ms ease, border-color 170ms ease, box-shadow 170ms ease;
}
.tile:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--brand) 40%, transparent);
  box-shadow: 0 26px 78px rgba(0, 0, 0, 0.28);
}

.tile-thumb { position: relative; background: rgba(255, 255, 255, 0.02); }

/* (keep disabled for now — you can paste your palette “glass line” version here if you want) */
.tile-thumb::after { content: none; }

.tile-thumb img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transform: scale(1.01);
  transition: transform 220ms ease;
  filter: saturate(0.95) contrast(1.02);
}
.tile:hover .tile-thumb img { transform: scale(1.06); }

.tile-body { padding: 14px 14px 16px; }
.tile-title { margin: 0 0 6px; font-size: 0.95rem; }
.tile-desc { margin: 0 0 10px; color: var(--muted); }

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 0.75rem;
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--border) 95%, transparent);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  padding: 4px 8px;
  border-radius: 999px;
}

/* Filters */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 14px;
}
.filter-chip {
  user-select: none;
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 85%, transparent);
  color: var(--muted);
  font-size: 0.95rem;
}
.filter-chip.active {
  background:
    linear-gradient(135deg,
      color-mix(in srgb, var(--brand) 16%, transparent),
      color-mix(in srgb, var(--brand-2) 12%, transparent)
    );
  border-color: color-mix(in srgb, var(--brand) 36%, transparent);
  color: var(--text);
}

/* Project detail */
.back-row { margin-bottom: 10px; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background: color-mix(in srgb, var(--panel) 85%, transparent);
}
.back-link:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
}

.project-meta {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.meta-card {
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
}
.meta-title { color: var(--muted); font-size: 0.9rem; margin-bottom: 6px; }
.meta-text a { text-decoration: underline; text-underline-offset: 3px; }

/* Gallery */
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.gallery-item {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  transition: transform 160ms ease, border-color 160ms ease;
  cursor: zoom-in;
}
.gallery-item:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--brand) 42%, transparent);
}
.gallery-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* Contact links grid */
.link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 12px;
}

/* NEW: 1 per row on iPhone/small screens */
@media (max-width: 520px) {
  .link-grid { grid-template-columns: 1fr; }
}

.link-card {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border-radius: 14px;
  padding: 12px;
  display: grid;
  gap: 6px;
}
.link-card .label { color: var(--muted); font-size: 0.9rem; }
.link-card a { text-decoration: underline; text-underline-offset: 3px; }

/* Footer */
.footer {
  padding: 24px 0 22px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.sep { opacity: 0.5; }

/* Focus states */
a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--brand) 70%, transparent);
  outline-offset: 3px;
  border-radius: 12px;
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
}
.lightbox.open { display: block; }

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg0) 70%, rgba(0,0,0,0.70));
}

.lightbox-content {
  position: relative;
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox-img {
  display: block;
  margin: 0 auto;
  max-width: min(1100px, 92vw);
  max-height: 78vh;
  border-radius: 16px;
  border: 1px solid color-mix(in srgb, var(--border) 95%, transparent);
  box-shadow: 0 34px 130px rgba(0,0,0,0.55);
  background: color-mix(in srgb, var(--panel) 85%, transparent);
  object-fit: contain;
}

.lightbox-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: 1px solid color-mix(in srgb, var(--border) 95%, transparent);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 999px;
  cursor: pointer;
  display: grid;
  place-items: center;
  backdrop-filter: blur(10px);
}
.lightbox-btn:hover {
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
}

.lightbox-prev { left: 22px; }
.lightbox-next { right: 22px; }

.lightbox-close {
  position: absolute;
  top: 18px;
  right: 18px;
  border: 1px solid color-mix(in srgb, var(--border) 95%, transparent);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 999px;
  cursor: pointer;
  backdrop-filter: blur(10px);
}
.lightbox-close:hover {
  background: color-mix(in srgb, var(--brand) 10%, var(--panel));
}

.lightbox-counter {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  color: color-mix(in srgb, var(--text) 92%, transparent);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 95%, transparent);
  padding: 8px 10px;
  border-radius: 999px;
  backdrop-filter: blur(10px);
  font-size: 0.95rem;
}

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .tile-grid { grid-template-columns: repeat(2, 1fr); }
  .project-meta { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 780px) {
  .nav { display: none; }
  .mobile-toggle { display: inline-flex; align-items: center; justify-content: center; }

  .hero { padding: 20px 0 12px; }
  .page-hero { padding: 16px 0 10px; }

  .section { padding: 24px 0; }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(1.65rem, 7vw, 2.2rem);
    margin-bottom: 8px;
  }

  .lead { font-size: 0.98rem; }

  .panel { padding: 14px 14px; }
  .meta-card,
  .link-card,
  .toolset-vertical .note { padding: 10px; }

  .tile-grid { grid-template-columns: repeat(2, 1fr); }
  .tile-body { padding: 10px; }
  .tile-title { font-size: 0.88rem; }

  .pill { padding: 6px 8px; font-size: 0.88rem; }
  .hero-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .filter-chip { padding: 7px 9px; font-size: 0.9rem; }

  .gallery { gap: 10px; }

  .lightbox-prev { left: 10px; }
  .lightbox-next { right: 10px; }
  .lightbox-close { right: 10px; }
  .lightbox-img { max-height: 74vh; }
}

@media (max-width: 380px) {
  .hero-meta { grid-template-columns: 1fr; }
  .tile-grid { grid-template-columns: 1fr; }
}

/* ===== Sketchfab embed ===== */
.sketchfab-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.03);
  box-shadow: var(--shadow);
}

.sketchfab {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  border: 0;
}

@media (min-width: 980px) {
  .sketchfab { aspect-ratio: 21 / 9; }
}

/* Project meta: allow 3-column layouts to stretch evenly */
.project-meta.meta-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 980px) {
  .project-meta.meta-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .project-meta.meta-3 {
    grid-template-columns: 1fr;
  }
}

/* Project meta: allow 2-column layouts to stretch evenly */
.project-meta.meta-2 {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 520px) {
  .project-meta.meta-2 {
    grid-template-columns: 1fr;
  }
}