:root {
  --bg: #ffffff;
  --text: #0b0b0c;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #0ea5e9;
  --card: #f8fafc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0c;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --accent: #22d3ee;
    --card: #111827;
  }
}

/* ========== Base Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Ubuntu, Cantarell, Noto Sans, Arial;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; display: block; }

/* ========== Layout Containers ========== */
.container {
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 2vw;
}
.stack > * + * { margin-top: 1rem; }
.stack-sm > * + * { margin-top: .5rem; }

/* ========== Header / Nav ========== */
header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2vw;
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.3rem; }
.brand .dot { color: var(--accent); }
.nav a {
  padding: .6rem .8rem;
  border-radius: .6rem;
  font-size: 1rem;
}
.nav a:hover {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ========== Hero Section ========== */
.hero {
  padding: 5rem 2vw 3rem;
  max-width: 100%;
  text-align: center;
}
.kicker {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: .95rem;
}
h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-top: .5rem;
}
.subtitle {
  color: var(--muted);
  max-width: 900px;
  margin: 1rem auto 0;
}
.cta-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
}
.btn {
  display: inline-block;
  padding: .7rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: .8rem;
  transition: background .15s ease, transform .15s ease;
}
.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.btn--primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn--ghost { background: transparent; }

/* ========== Card Logos ========== */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-logo {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: contain;
  opacity: 0.9;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.card-logo:hover {
  transform: scale(1.05);
  opacity: 1;
}

/* ========== Sections ========== */
section {
  padding: 4rem 2vw;
  width: 100%;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: .02em;
  text-align: center;
}
.section-subtitle {
  color: var(--muted);
  text-align: center;
  max-width: 800px;
  margin: .5rem auto 2rem;
}

/* ========== Cards / Grid ========== */
.grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}
.grid--3 > .card {
  flex: 1 1 calc(33.333% - 1.5rem);
  min-width: 300px;
}
@media (max-width: 900px) {
  .grid--3 > .card { flex: 1 1 calc(50% - 1.5rem); }
}
@media (max-width: 640px) {
  .grid--3 > .card { flex: 1 1 100%; }
}

.card {
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--card);
  padding: 1.5rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
  box-sizing: border-box;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--text) 10%, transparent);
}
.card h3 {
  margin: 0 0 .6rem;
  font-size: 1.1rem;
}
.meta {
  color: var(--muted);
  font-size: .9rem;
}
.tag {
  display: inline-block;
  padding: .2rem .6rem;
  border: 1px solid var(--border);
  border-radius: .6rem;
  font-size: .8rem;
  color: var(--muted);
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* ========== Expandable Card Detail ========== */
.card-detail {
  display: none;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
}
.card.open .card-detail {
  display: block;
  animation: fadeIn 0.25s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== Footer ========== */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2vw;
  color: var(--muted);
  font-size: .95rem;
  text-align: center;
}

/* ========== Mobile Optimization ========== */
@media (max-width: 600px) {
  body { font-size: 0.95rem; }
  .hero { padding: 3.5rem 1rem 2rem; }
  .btn { padding: .6rem 1rem; }
  header .nav { flex-direction: column; gap: .5rem; }
  section { padding: 2.5rem 1rem; }
}