:root { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #171717; }
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; }
.shell { min-height: 100vh; }
.topbar { height: 68px; display: flex; align-items: center; justify-content: space-between; padding: 0 10px;f border-bottom: 1px solid #ddd; background: rgba(255,255,255,.9); }
.brand { font-family: Georgia, serif; font-size: 1.55rem; font-weight: 700; text-decoration: none; letter-spacing: .08em; }
nav { display: flex; gap: 1.4rem; }
nav a { text-decoration: none; color: #555; }
nav a.active { color: #111; font-weight: 650; text-decoration: none }
main { width: min(1100px, 90vw); margin: 0 auto; }
.hero { padding: 4rem 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .16em; color: #666; font-size: .8rem; }
h1 { font-family: Georgia, serif; font-size: clamp(3rem, 8vw, 6.5rem); margin: .1rem 0 1rem; font-weight: 500; }
h2 { margin-top: 2.5rem; }
.lede { font-size: 1.35rem; color: #555; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; margin-top: 3rem; }
.card { background: white; border: 1px solid #ddd; border-radius: 14px; padding: 1.3rem; display: grid; gap: .45rem; }
.card span { color: #666; }
.diagram { overflow-x: auto; padding: 1.2rem; background: #1f1f1f; color: #f4f4f4; border-radius: 10px; }
.photo-form { display: flex; flex-wrap: wrap; gap: .65rem; margin: 1.5rem 0; }
input, button { font: inherit; padding: .7rem .85rem; border-radius: 8px; border: 1px solid #bbb; }
button { background: #1c1c1c; color: white; cursor: pointer; }
.photo-list { padding-left: 1.3rem; }
@media (max-width: 600px) { .topbar { align-items: flex-start; height: auto; padding-top: 1rem; padding-bottom: 1rem; gap: 1rem; } nav { gap: .75rem; flex-wrap: wrap; justify-content: flex-end; } main { padding-top: 2.5rem; } }

/* Wall preview drop-zone highlight */
.drop-zone.drag-over {
    outline: 2px dashed rgba(13,110,253,0.6);
    background-color: rgba(13,110,253,0.03);
}