:root {
  --radius: 0.75rem;
  --background: oklch(0.985 0.002 260);
  --foreground: oklch(0.145 0.035 260);
  --card: oklch(1 0 0);
  --primary: oklch(0.165 0.042 265);
  --primary-foreground: oklch(0.985 0.002 260);
  --secondary: oklch(0.955 0.008 260);
  --muted-foreground: oklch(0.5 0.03 260);
  --accent: oklch(0.58 0.2 255);
  --accent-foreground: oklch(1 0 0);
  --border: oklch(0.915 0.01 260);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 72rem; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Navbar ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: color-mix(in oklch, var(--background) 80%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
}
.nav-inner {
  max-width: 72rem; margin: 0 auto; padding: 0 1.5rem;
  height: 4rem; display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { font-size: 1.125rem; font-weight: 700; letter-spacing: -0.02em; }
.nav-links { display: none; align-items: center; gap: 2rem; }
.nav-links a { font-size: 0.875rem; color: var(--muted-foreground); transition: color .2s; }
.nav-links a:hover { color: var(--foreground); }
.nav-cta {
  font-size: 0.875rem !important;
  background: var(--primary); color: var(--primary-foreground) !important;
  padding: 0.5rem 1rem; border-radius: 0.5rem; transition: opacity .2s;
}
.nav-cta:hover { opacity: 0.9; color: var(--primary-foreground) !important; }
.nav-toggle {
  display: flex; background: none; border: none; cursor: pointer;
  color: var(--foreground); padding: 0.25rem;
}
.nav-mobile {
  display: none; padding: 0 1.5rem 1.5rem;
  background: var(--background); border-bottom: 1px solid var(--border);
}
.nav-mobile.open { display: block; }
.nav-mobile a {
  display: block; font-size: 0.875rem; color: var(--muted-foreground);
  padding: 0.5rem 0;
}
.nav-mobile a:hover { color: var(--foreground); }
.nav-mobile .nav-cta {
  display: block; text-align: center; margin-top: 0.5rem;
  color: var(--primary-foreground) !important;
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .nav-toggle { display: none; }
  .nav-mobile { display: none !important; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 90vh; display: flex; flex-direction: column; justify-content: center;
  padding: 4rem 1.5rem 0;
}
.hero-inner { max-width: 72rem; margin: 0 auto; width: 100%; }
.hero-kicker {
  color: var(--accent); font-size: 0.875rem; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; margin-bottom: 1.5rem;
}
.hero-lead {
  font-size: 1.125rem; color: var(--muted-foreground);
  max-width: 36rem; margin-bottom: 2.5rem;
}
@media (min-width: 768px) { .hero-lead { font-size: 1.25rem; } }

.btn-outline {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.875rem; font-weight: 500;
  border: 1px solid var(--border); border-radius: 9999px;
  padding: 0.75rem 1.5rem; transition: background .2s;
}
.btn-outline:hover { background: var(--secondary); }

/* ---------- Section headings ---------- */
.section { padding: 6rem 1.5rem; }
.section-muted { background: color-mix(in oklch, var(--secondary) 50%, transparent); }
.section h2 {
  font-size: clamp(1.875rem, 4vw, 2.25rem);
  font-weight: 700; margin-bottom: 1rem;
}
.section-lead {
  color: var(--muted-foreground); max-width: 36rem; margin-bottom: 3rem;
}
.section-lead.wide { max-width: 42rem; font-size: 1.125rem; }

/* ---------- Project grid ---------- */
.project-grid {
  display: grid; grid-template-columns: 1fr; gap: 2rem;
}
@media (min-width: 768px) {
  .project-grid { grid-template-columns: 1fr 1fr; }
}

.project-card {
  display: block; position: relative; overflow: hidden;
  border-radius: 1rem; background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  transition: transform .3s ease, box-shadow .3s ease;
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
}
.project-img {
  aspect-ratio: 4 / 3; overflow: hidden; position: relative;
}
.project-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s ease;
}
.project-card:hover .project-img img { transform: scale(1.05); }
.project-lock {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: color-mix(in oklch, var(--primary) 90%, transparent);
  color: var(--primary-foreground);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.375rem 0.625rem;
  border-radius: 9999px;
  backdrop-filter: blur(4px);
}
.project-lock svg { display: block; }

.project-coming {
  position: absolute; inset: 0;
  background: color-mix(in oklch, var(--primary) 80%, transparent);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-foreground); font-weight: 600; font-size: 1.125rem;
}
.project-body { padding: 1.5rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.75rem; }
.tag {
  font-size: 0.75rem; font-weight: 500; color: var(--accent);
  background: color-mix(in oklch, var(--accent) 10%, transparent);
  padding: 0.25rem 0.625rem; border-radius: 9999px;
}
.project-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.25rem; }
.project-card p { font-size: 0.875rem; color: var(--muted-foreground); }
.project-blurb { margin-top: 0.75rem; line-height: 1.55; }

/* ---------- About skills ---------- */
.skills {
  display: grid; grid-template-columns: 1fr; gap: 1.5rem;
}
@media (min-width: 640px) { .skills { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .skills { grid-template-columns: repeat(4, 1fr); } }
.skill {
  background: var(--card); border-radius: 0.75rem; padding: 1.5rem;
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
}
.skill svg { color: var(--accent); margin-bottom: 1rem; }
.skill h3 { font-weight: 600; margin-bottom: 0.5rem; }
.skill p { font-size: 0.875rem; color: var(--muted-foreground); }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact .section-lead { margin: 0 auto 2.5rem; max-width: 28rem; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 0.75rem;
  background: var(--primary); color: var(--primary-foreground);
  padding: 1rem 2rem; border-radius: 0.75rem;
  font-size: 1.125rem; font-weight: 500;
  transition: opacity .2s;
}
.btn-primary:hover { opacity: 0.9; }

/* ---------- Footer ---------- */
.footer {
  padding: 2rem 1.5rem; border-top: 1px solid var(--border);
  font-size: 0.875rem; color: var(--muted-foreground);
}
.footer-inner {
  max-width: 72rem; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center;
  gap: 1rem; text-align: center;
}
.footer a:hover { color: var(--foreground); }
@media (min-width: 640px) {
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}

/* ---------- Project detail page ---------- */
.detail-main { padding-top: 4rem; }
.detail-hero { position: relative; }
.detail-hero-img {
  aspect-ratio: 16 / 7; max-height: 500px; overflow: hidden;
}
.detail-hero-img img { width: 100%; height: 100%; object-fit: cover; }
.detail-hero-fade {
  position: absolute; inset: 0;
  background: linear-gradient(to top,
    var(--background),
    color-mix(in oklch, var(--background) 30%, transparent),
    transparent);
}
.detail-hero-text {
  position: absolute; bottom: 0; left: 0; right: 0; padding: 0 1.5rem;
}
.detail-hero-inner { max-width: 56rem; margin: 0 auto; padding-bottom: 2rem; }
.back-link {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.875rem; color: var(--muted-foreground);
  margin-bottom: 1rem; transition: color .2s;
}
.back-link:hover { color: var(--foreground); }
.detail-hero h1 {
  font-size: clamp(1.875rem, 5vw, 3rem); font-weight: 700; margin-top: 0.25rem;
}
.detail-hero-sub { font-size: 1.125rem; color: var(--muted-foreground); margin-top: 0.5rem; }
.detail-hero .tag {
  background: color-mix(in oklch, var(--accent) 20%, transparent);
  backdrop-filter: blur(4px);
  padding: 0.25rem 0.75rem;
}

.detail-content {
  max-width: 56rem; margin: 0 auto; padding: 4rem 1.5rem;
}
.detail-content section + section { margin-top: 4rem; }
.detail-content h2 {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem;
}
.detail-content p.lead {
  font-size: 1.125rem; color: var(--muted-foreground); line-height: 1.7;
}
.goal-list, .process-list { display: flex; flex-direction: column; gap: 0.75rem; }
.goal {
  display: flex; align-items: flex-start; gap: 0.75rem;
}
.goal svg { color: var(--accent); margin-top: 0.125rem; flex-shrink: 0; }
.goal p { color: var(--muted-foreground); }

.process-list { gap: 2rem; }
.process-step {
  position: relative; padding-left: 2rem;
  border-left: 2px solid color-mix(in oklch, var(--accent) 30%, transparent);
}
.process-step::before {
  content: ""; position: absolute; left: 0; top: 0;
  transform: translateX(-50%);
  width: 1rem; height: 1rem; border-radius: 9999px; background: var(--accent);
}
.process-step h3 { font-weight: 600; font-size: 1.125rem; margin-bottom: 0.5rem; }
.process-step p { color: var(--muted-foreground); }

.challenge-box {
  background: color-mix(in oklch, var(--secondary) 50%, transparent);
  border-radius: 0.75rem; padding: 1.5rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.challenge-box p { color: var(--muted-foreground); }

.outcome-grid {
  display: grid; grid-template-columns: 1fr; gap: 1rem;
}
@media (min-width: 640px) { .outcome-grid { grid-template-columns: 1fr 1fr; } }
.outcome {
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  border-radius: 0.75rem; padding: 1.25rem;
}
.outcome svg { color: var(--accent); margin-bottom: 0.5rem; }
.outcome p { font-size: 0.875rem; color: var(--muted-foreground); }

.bullet-list {
  list-style: disc;
  padding-left: 1.25rem;
  color: var(--muted-foreground);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.bullet-list li { padding-left: 0.25rem; }

.video-frame,
.image-frame {
  margin-top: 1.5rem;
  border-radius: 0.75rem;
  overflow: hidden;
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  box-shadow: 0 10px 25px -10px rgb(0 0 0 / 0.15);
}
.video-frame video,
.image-frame img {
  display: block;
  width: 100%;
  height: auto;
}
.image-frame-dark {
  background: oklch(0.15 0.02 260);
  padding: 1rem;
}

.figma-frame {
  margin-top: 1.5rem;
  border-radius: 0.75rem;
  overflow: hidden;
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  box-shadow: 0 10px 25px -10px rgb(0 0 0 / 0.15);
  aspect-ratio: 4 / 3;
}
.figma-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}
@media (max-width: 640px) {
  .figma-frame { aspect-ratio: 9 / 16; }
}

.download-row { margin-top: 1.5rem; }
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--foreground);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  transition: background .2s, border-color .2s;
}
.download-btn:hover {
  background: var(--secondary);
  border-color: var(--accent);
}
.download-btn svg { color: var(--accent); }

.choice-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.choice {
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  border-left: 3px solid var(--accent);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
}
.choice h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--foreground);
}
.choice p { color: var(--muted-foreground); line-height: 1.6; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (min-width: 640px) { .stats-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }
.stat {
  background: var(--card);
  border: 1px solid color-mix(in oklch, var(--border) 50%, transparent);
  border-radius: 0.75rem;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
}
.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--muted-foreground);
}

.detail-footer-link {
  margin-top: 4rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.detail-footer-link a {
  display: inline-flex; align-items: center; gap: 0.5rem;
  color: var(--accent); font-weight: 500;
}
.detail-footer-link a:hover { text-decoration: underline; }