*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg: rgb(15, 15, 15);
    --bg2: #191a1c;
    --bg3: #1e1e1e;
    --border: #3d3d3d;
    --text: #87d9fb;
    --muted: #808080;
    --faint: #5f5f5f;
    --accent: #6a92a7;
    --green:  #6a8759;
    --orange: #cc7832;
    --red:    #f85149;
    --purple:  #d2a8ff;
    --mono:    'JetBrains Mono', 'Fira Code', monospace;
}
html { scroll-behavior: smooth; }
body { background: var(--bg); font-family: var(--mono); color: var(--text); -webkit-font-smoothing: antialiased; }

/* NAV */
nav { position: fixed; top: 0; left: 0; right: 0; z-index: 500; display: flex; align-items: stretch; background: var(--bg2); border-bottom: 1px solid var(--border); height: 38px; }
.nav-back { display: flex; align-items: center; gap: 0.5rem; padding: 0 1.2rem; font-size: 0.7rem; color: var(--muted); text-decoration: none; border-right: 1px solid var(--border); transition: color 0.15s; }
.nav-back:hover { color: var(--text); }
.nav-breadcrumb { display: flex; align-items: center; gap: 0.5rem; padding: 0 1.2rem; font-size: 0.7rem; color: var(--faint); }
.nav-breadcrumb .current { color: var(--text); }
.nav-right { margin-left: auto; display: flex; align-items: center; padding: 0 1rem; font-size: 0.65rem; border-left: 1px solid var(--border); gap: 1rem; }
.nav-right a { color: var(--muted); text-decoration: none; transition: color 0.15s; }
.nav-right a:hover { color: var(--accent); }

/* LAYOUT */
main { max-width: 860px; margin: 0 auto; padding: 5rem 2rem 6rem; }

/* HERO */
.proj-hero { margin-bottom: 3.5rem; }
.proj-path { font-size: 0.65rem; color: var(--muted); display: flex; align-items: center; gap: 0.4rem; margin-bottom: 1.5rem; }
.proj-path .file { color: var(--accent); }
.proj-path .sep  { color: var(--faint); }
.proj-title { font-size: clamp(2rem,5vw,3.6rem); font-weight: 700; line-height: 1.05; color: var(--text); margin-bottom: 1rem; }
.proj-title .dim { color: var(--muted); font-weight: 300; }
.proj-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; font-size: 0.68rem; color: var(--muted); margin-bottom: 1.5rem; }
.proj-meta .label { color: var(--faint); margin-right: 0.3rem; }
.proj-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.proj-tag { font-size: 0.62rem; color: var(--muted); border: 1px solid var(--border); padding: 0.2rem 0.6rem; border-radius: 4px; background: var(--bg2); transition: border-color 0.2s, color 0.2s; }
.proj-tag:hover { border-color: var(--accent); color: var(--accent); }

/* MAIN MEDIA */
.proj-media { width: 100%; aspect-ratio: 16/9; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; display: flex; align-items: center; justify-content: center; margin-bottom: 3rem; }
.proj-media img, .proj-media video { width: 100%; height: 100%; object-fit: cover; display: block; }
.media-placeholder { display: flex; flex-direction: column; align-items: center; gap: 1rem; color: var(--faint); font-size: 0.7rem; text-align: center; padding: 2rem; }
.media-placeholder .icon { font-size: 2.5rem; opacity: 0.3; }
.media-placeholder code { font-size: 0.6rem; color: var(--muted); }

/* SECTIONS */
.section { margin-bottom: 3rem; }
.section-label { font-size: 0.62rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 1.2rem; display: flex; align-items: center; gap: 0.8rem; }
.section-label::after { content:''; flex:1; height:1px; background:var(--border); }

/* PROSE */
.prose { font-size: 0.82rem; color: var(--muted); line-height: 2; font-weight: 300; }
.prose strong { color: var(--text); font-weight: 500; }
.prose p + p { margin-top: 1em; }

/* CHALLENGES */
.challenges { display: flex; flex-direction: column; gap: 0.75rem; }
.challenge { display: grid; grid-template-columns: 2.2rem 1fr; gap: 1rem; padding: 1rem 1.2rem; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; transition: border-color 0.2s; }
.challenge:hover { border-color: var(--accent); }
.challenge-num { font-size: 0.65rem; color: var(--accent); font-weight: 700; padding-top: 0.15rem; }
.challenge-text { font-size: 0.78rem; color: var(--muted); line-height: 1.85; }
.challenge-text strong { color: var(--text); font-weight: 500; }

/* CODE BLOCK */
.code-block { background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 0.5rem; }
.code-header { display: flex; align-items: center; justify-content: space-between; padding: 0.55rem 1rem; background: var(--bg3); border-bottom: 1px solid var(--border); font-size: 0.65rem; }
.code-filename { color: var(--text); }
.code-lang { color: var(--faint); }
.copy-btn { font-family: var(--mono); font-size: 0.6rem; color: var(--muted); background: none; border: 1px solid var(--border); padding: 0.18rem 0.55rem; border-radius: 4px; cursor: pointer; transition: color 0.2s, border-color 0.2s; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
pre { padding: 1.4rem 1.2rem; overflow-x: auto; font-size: 0.75rem; line-height: 1.9; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
pre::-webkit-scrollbar { height: 4px; }
pre::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.kw  { color: var(--accent); }
.fn  { color: var(--purple); }
.str { color: var(--green); }
.num { color: var(--orange); }
.cm  { color: var(--muted); font-style: italic; }
.pun { color: var(--faint); }
.tp  { color: #ffa657; }

/* GALLERY */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.gallery-item { aspect-ratio: 16/9; background: var(--bg3); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; display: flex; align-items: center; justify-content: center; color: var(--faint); font-size: 0.62rem; cursor: pointer; transition: border-color 0.2s; }
.gallery-item:hover { border-color: var(--accent); }
.gallery-item img { width:100%; height:100%; object-fit:cover; }

/* LINKS */
.proj-links { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.proj-link { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.72rem; text-decoration: none; padding: 0.6rem 1.1rem; border-radius: 6px; border: 1px solid var(--border); color: var(--muted); background: var(--bg2); transition: border-color 0.2s, color 0.2s; }
.proj-link:hover { border-color: var(--accent); color: var(--accent); }
.proj-link.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.proj-link.primary:hover { background: #79b8ff; color: var(--bg); }

/* PREV / NEXT */
.proj-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 5rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.proj-nav-item { display: flex; flex-direction: column; gap: 0.3rem; padding: 1rem 1.2rem; background: var(--bg2); border: 1px solid var(--border); border-radius: 6px; text-decoration: none; color: inherit; transition: border-color 0.2s; }
.proj-nav-item:hover { border-color: var(--accent); }
.proj-nav-item.next { text-align: right; }
.proj-nav-label { font-size: 0.6rem; color: var(--faint); }
.proj-nav-title { font-size: 0.82rem; color: var(--text); }

@media (max-width: 600px) {
    main { padding: 4.5rem 1.2rem 4rem; }
    .gallery { grid-template-columns: 1fr; }
    .lightbox { position: fixed; inset: 0; z-index: 1000; background: rgba(1,4,9,0.92); display: none; align-items: center; justify-content: center; padding: 2rem; backdrop-filter: blur(6px); cursor: zoom-out; }
    .lightbox.open { display: flex; }
    .lightbox img { max-width: 100%; max-height: 90vh; border-radius: 6px; border: 1px solid var(--border); box-shadow: 0 32px 80px rgba(0,0,0,0.8); }
    .lightbox-close { position: absolute; top: 1rem; right: 1.5rem; font-size: 1.2rem; color: var(--muted); cursor: pointer; background: none; border: none; font-family: var(--mono); transition: color 0.15s; }
    .lightbox-close:hover { color: var(--text); }
    .proj-nav { grid-template-columns: 1fr; }
}