/* ========== THEME VARIABLES ========== */
:root {
  --bg: #0d1117;
  --bg-alt: #161b22;
  --bg-soft: #1f242c;
  --fg: #e6edf3;
  --fg-dim: #9da5b4;
  --accent: #4fa3ff;
  --accent-glow: #82c3ff;
  --danger: #ff5f56;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 8px 24px -8px rgba(0,0,0,.5);
  --transition: .25s cubic-bezier(.4,.2,.2,1);
  --font-stack: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Ubuntu,"Helvetica Neue",Arial,sans-serif;
  --mono: ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f4f6f9;
  --bg-soft: #eef1f5;
  --fg: #1c242d;
  --fg-dim: #59646f;
  --accent: #0068d6;
  --accent-glow: #3b8fe6;
  --shadow: 0 10px 28px -10px rgba(0,40,90,.15);
}

/* ========== GLOBAL ========== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-stack);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img, video, iframe { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3 { font-weight: 600; }
p { margin: 0 0 1em; }
.lead { font-size: 1.05rem; max-width: 760px; }

/* ========== TOP BAR ========== */
.topbar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  background: rgba(13,17,23,.75);
  border-bottom: 1px solid rgba(255,255,255,.06);
  z-index: 50;
}
[data-theme="light"] .topbar {
  background: rgba(255,255,255,.85);
  border-color: rgba(0,0,0,.08);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: .75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.logo { font-size: 1.25rem; margin: 0; letter-spacing: .5px; }
.logo a { color: var(--fg); text-decoration: none; }
.accent { color: var(--accent); }
.main-nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-left: auto;
}
.nav-link {
  font-size: .85rem;
  padding: .45rem .9rem;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--fg-dim);
  transition: var(--transition);
}
.nav-link:hover {
  color: var(--fg);
  background: var(--accent);
  text-decoration: none;
}
.theme-toggle {
  background: var(--bg-soft);
  color: var(--fg);
  border: none;
  cursor: pointer;
  font-size: .95rem;
  padding: .45rem .7rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.theme-toggle:hover { background: var(--accent); }

/* ========== HERO / ABOUT ========== */
.hero {
  position: relative;
  padding: 4.5rem 1.4rem 3.5rem;
  display: grid;
  place-items: center;
}
.hero-inner {
  max-width: 1200px;
  width: 100%;
}
.hero-layout {
  display: grid;
  gap: 3rem;
  align-items: start;
}
@media (min-width: 900px) {
  .hero-layout {
    grid-template-columns: minmax(0,1fr) 340px;
  }
}
@media (max-width: 899px) {
  .about-photo { order: -1; }
}
.hero-title {
  margin-top: 0;
  font-size: 1.9rem;
  letter-spacing: .6px;
  background: linear-gradient(90deg,var(--accent),var(--accent-glow));
  -webkit-background-clip: text;
  color: transparent;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 25% 30%, rgba(79,163,255,.18), transparent 65%),
    radial-gradient(circle at 70% 55%, rgba(79,163,255,.12), transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: .8rem;
}
.hero-tags span {
  font-size: .65rem;
  letter-spacing: .7px;
  text-transform: uppercase;
  background: var(--bg-soft);
  padding: .4rem .6rem;
  border-radius: 100px;
  color: var(--fg-dim);
  transition: var(--transition);
}
.hero-tags span:hover { background: var(--accent); color: #fff; }
.about-photo {
  margin: 0;
  background: var(--bg-alt);
  padding: .8rem;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: .4rem;
  max-width: 340px;
}
.about-photo img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: #000;
}
.photo-cap {
  font-size: .65rem;
  color: var(--fg-dim);
  text-align: center;
}

/* ========== SECTION HEADERS ========== */
.projects-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.4rem 5rem;
}
.section-head { margin-bottom: 1.2rem; }
.section-head h2 { margin: 0 0 .3rem; font-size: 1.6rem; }
.section-sub { margin: 0; color: var(--fg-dim); max-width: 800px; }

/* ========== GRID + CARD ========== */
.grid {
  display: grid;
  gap: 1.3rem;
  grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
}
.card {
  position: relative;
  background: linear-gradient(145deg,var(--bg-alt),var(--bg-soft));
  border: 1px solid rgba(255,255,255,.04);
  border-radius: var(--radius);
  padding: 1.1rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  box-shadow: var(--shadow);
  isolation: isolate;
  overflow: hidden;
  transform: translateY(6px);
  opacity: 0;
  animation: riseFade .7s forwards;
}
@keyframes riseFade { to { transform: translateY(0); opacity: 1; } }
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 15%, rgba(79,163,255,.18), transparent 70%);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}
.card:hover::before { opacity: 1; }
.card h3 { margin: 0; font-size: 1rem; font-weight: 600; }
.card .tagline { margin: 0; font-size: .8rem; color: var(--fg-dim); min-height: 2.4em; }
.badges { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: auto; }
.badge {
  background: var(--bg-soft);
  padding: .3rem .55rem;
  border-radius: var(--radius-sm);
  font-size: .6rem;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: var(--fg-dim);
  transition: var(--transition);
}
.card:hover .badge:first-child { background: var(--accent); color: #fff; }
.card-link { display: contents; text-decoration: none; color: inherit; }
.card-btn {
  margin-top: .4rem;
  font-size: .7rem;
  align-self: flex-start;
  background: var(--accent);
  color: #fff;
  padding: .45rem .75rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: .8px;
  font-weight: 600;
  box-shadow: 0 4px 12px -4px rgba(79,163,255,.5);
  transition: var(--transition);
}
.card-btn:hover { transform: translateY(-3px); text-decoration: none; }

/* ========== PROJECT PAGE ========== */
.project-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.2rem 1.4rem 5rem;
}
.project-article {
  background: var(--bg-alt);
  padding: 2rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.05);
  box-shadow: var(--shadow);
}
.project-head h1 { margin: 0 0 .4rem; font-size: 2rem; letter-spacing: .5px; }
.meta { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .7rem; }
.meta .badge { background: var(--bg-soft); }
.block { margin-top: 2rem; }
.block:first-of-type { margin-top: 1rem; }
.block h2.section-title {
  font-size: .85rem;
  letter-spacing: .8px;
  text-transform: uppercase;
  margin: 0 0 .9rem;
  color: var(--accent);
  font-weight: 600;
}

.media-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit,minmax(240px,1fr));
}
.media-item {
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  padding: .6rem .6rem .9rem;
  display: flex;
  flex-direction: column;
  gap: .55rem;
  border: 1px solid rgba(255,255,255,.04);
}
.media-item img,
.media-item video,
.media-item iframe {
  border-radius: 6px;
  width: 100%;
  height: auto;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: #000;
}
.caption {
  font-size: .65rem;
  color: var(--fg-dim);
  letter-spacing: .5px;
  line-height: 1.3;
}

/* ========== FALLBACK / FOOTER ========== */
.fallback {
  margin-top: 2rem;
  background: var(--danger);
  color: #fff;
  padding: .9rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .8rem;
  letter-spacing: .5px;
}
.site-footer {
  padding: 2rem 1.4rem 3rem;
  text-align: center;
  font-size: .75rem;
  color: var(--fg-dim);
}

/* ========== RESPONSIVE / LIGHT MODE ========== */
@media (min-width: 840px) {
  .hero { padding: 5.5rem 1.6rem 4.2rem; }
  .hero-title { font-size: 2.25rem; }
  .card h3 { font-size: 1.05rem; }
}
[data-theme="light"] .card,
[data-theme="light"] .project-article { border-color: rgba(0,0,0,.07); }
[data-theme="light"] .badge { background: #dbe3eb; color: #333; }
[data-theme="light"] .nav-link { background: #e3e7ec; }
[data-theme="light"] .hero-tags span { background: #e3e7ec; }
[data-theme="light"] .hero-tags span:hover { background: var(--accent); }

img.has-alpha {
  background-color: #ffffff;
  padding: 2px;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 6px;
}