/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px; height: 38px;
  padding: 0 22px; border-radius: 19px; font-family: inherit;
  font-size: 13px; font-weight: 600; cursor: pointer; border: none;
  transition: all 0.25s; white-space: nowrap; text-decoration: none; line-height: 1;
}
.btn-primary { background: linear-gradient(135deg, #7C3AED, #5B21B6); color: #FFFFFF; box-shadow: 0 4px 16px rgba(124,58,237,0.3); }
.btn-primary:hover { box-shadow: 0 6px 24px rgba(124,58,237,0.45); transform: translateY(-1px); text-decoration: none; }
.btn-ghost { background: var(--btn-ghost-bg); color: var(--btn-ghost-color); border: 1px solid var(--btn-ghost-border); }
.btn-ghost:hover { background: var(--btn-ghost-hover); text-decoration: none; }
.btn-outline { background: transparent; color: var(--text-link); border: 1px solid rgba(124,58,237,0.4); }
.btn-outline:hover { background: rgba(124,58,237,0.12); text-decoration: none; }

/* ===== Section ===== */
.section { padding: 48px; }
.sec-hd { max-width: 640px; margin-bottom: 28px; }
.sec-hd h2 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.sec-hd p { font-size: 14px; color: var(--text-secondary); }

/* ===== Cards ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; }
.card-grid-4 { grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); }

/* ===== Bento grid ===== */
.card-grid.bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(110px, auto); grid-auto-flow: dense; }
.card-grid.bento > .card.featured { grid-column: span 2; grid-row: span 2; padding: 28px; background: linear-gradient(135deg, rgba(124,58,237,0.10), rgba(8,145,178,0.04)); background-color: var(--bg-card-solid); border-color: rgba(124,58,237,0.3); }
.card-grid.bento > .card.featured .card-icon { width: 52px; height: 52px; font-size: 26px; border-radius: 14px; }
.card-grid.bento > .card.featured h3 { font-size: 18px; }
.card-grid.bento > .card.featured p { font-size: 14px; }
.card-grid.bento > .proj-card.bf { grid-column: span 2; grid-row: span 2; }
.card-grid.bento > .proj-card.bf .proj-banner { height: auto; min-height: 220px; flex: 1; }
.card-grid.bento > .proj-card.bw { grid-column: span 2; }
@media (max-width: 860px) {
  .card-grid.bento { grid-template-columns: repeat(2, 1fr); }
  .card-grid.bento > .card.featured, .card-grid.bento > .proj-card.bf { grid-column: span 2; grid-row: span 2; }
  .card-grid.bento > .proj-card.bw { grid-column: span 2; }
}
@media (max-width: 560px) {
  .card-grid.bento { grid-template-columns: 1fr; }
  .card-grid.bento > .card.featured, .card-grid.bento > .proj-card.bf, .card-grid.bento > .proj-card.bw { grid-column: span 1; grid-row: span 1; }
}
.card {
  background: var(--bg-card);
  background-color: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: 12px; padding: 24px; cursor: pointer;
  transition: all 0.3s; position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, #7C3AED, #7C3AED, transparent);
  opacity: 0; transition: opacity 0.3s;
}
.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.card:hover::before { opacity: 1; }
.card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; margin-bottom: 14px;
}
.card-icon.b { background: rgba(124,58,237,0.18); color: #7C3AED; }
.card-icon.g { background: rgba(52,211,153,0.14); color: #34D399; }
.card-icon.a { background: rgba(124,58,237,0.14); color: #7C3AED; }
.card-icon.p { background: rgba(124,58,237,0.14); color: #A78BFA; }
.card-icon.r { background: rgba(248,113,113,0.14); color: #F87171; }
.card-icon.c { background: rgba(124,58,237,0.14); color: #7C3AED; }
.card-icon.pk { background: rgba(124,58,237,0.14); color: #7C3AED; }
.card-icon.o { background: rgba(124,58,237,0.14); color: #7C3AED; }
.card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.card-tags { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.ctag {
  padding: 2px 10px; border-radius: 10px; font-size: 11px;
  background: rgba(255,255,255,0.04); color: var(--text-muted);
  border: 1px solid var(--border-color);
}
.card .card-link {
  display: inline-flex; align-items: center; gap: 4px; margin-top: 12px;
  font-size: 12px; color: var(--text-link); font-weight: 500;
}
.card:hover .card-link { color: var(--text-link-hover); }

/* ===== Features ===== */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 12px; }
.feat-card {
  background: var(--bg-card);
  background-color: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  border-radius: 12px; padding: 20px; display: flex; gap: 16px; align-items: flex-start;
  transition: all 0.3s; cursor: pointer;
}
.feat-card:hover { border-color: var(--border-hover); transform: translateY(-2px); box-shadow: var(--shadow-card-hover); }
.feat-card .fc-icon { flex-shrink: 0; margin: 0; width: 36px; height: 36px; font-size: 17px; }
.feat-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.feat-card p { font-size: 12px; color: var(--text-secondary); line-height: 1.6; }