:root { color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, system-ui, sans-serif; background: radial-gradient(circle at top left, #0d1b64, #0a0f2d 35%, #22111d); color: #e9edf3; }
.app { max-width: 1240px; margin: 0 auto; padding: 24px; }
.topbar { display: flex; justify-content: space-between; align-items: center; border: 1px solid #2f395f; border-radius: 18px; padding: 14px 18px; background: #090e24; }
.brand { display: flex; gap: 12px; align-items: center; }
.logo { width: 52px; height: 52px; border-radius: 12px; background: #11183d; display: grid; place-items: center; font-size: 24px; color: #ff6858; }
h1 { margin: 0; font-size: 42px; line-height: 1; }
small { color: #aeb7d6; }
nav { display: flex; gap: 10px; }
button { background: #1a223f; border: 1px solid #374675; color: #eff3ff; padding: 10px 14px; border-radius: 12px; cursor: pointer; }
.message { margin: 16px 0; padding: 10px 14px; border: 1px solid #3d507f; border-radius: 12px; background: #162244; }
.grid { margin-top: 20px; display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: 16px; }
.card { border: 1px solid #2f416f; border-radius: 16px; background: #121b3a; overflow: hidden; cursor: pointer; text-decoration: none; color: inherit; transition: transform 0.18s ease, border-color 0.18s ease; }
.card:hover { transform: translateY(-3px); border-color: #4a61a4; }
.card img { width: 100%; height: 160px; object-fit: cover; }
.card h3 { padding: 0 12px; font-size: 20px; }
.card p { padding: 0 12px 14px; color: #bdc7e7; }
.detail { margin-top: 24px; border: 1px solid #30436f; border-radius: 18px; background: rgba(14, 24, 50, 0.8); padding: 30px; }
.back { color: #b9c4ea; cursor: pointer; text-decoration: none; background: transparent; border: none; padding: 0; font-size: 14px; }
.detail h2 { font-size: 56px; text-align: center; margin: 24px 0 14px; }
.meta { text-align: center; color: #bec6de; margin-bottom: 24px; }
.shareRow { margin-bottom: 18px; display: flex; justify-content: center; gap: 12px; align-items: center; flex-wrap: wrap; }
.shareRow a { color: #bcd1ff; text-decoration: none; border: 1px solid #40578f; border-radius: 999px; padding: 6px 12px; }
.shareRow a:hover { background: #182749; }
.content { background: #1d2d44; border: 1px solid #304a73; border-radius: 16px; padding: 28px; font-size: 22px; line-height: 1.65; }
.rich-content img,
.rich-content video,
.rich-content iframe { max-width: 100%; border-radius: 10px; margin: 12px 0; }
.rich-content iframe { min-height: 340px; width: 100%; border: none; }
.panel { margin-top: 20px; border: 1px solid #30436f; border-radius: 16px; padding: 22px; background: rgba(12, 22, 46, 0.8); display: grid; gap: 10px; max-width: 760px; }
input, textarea { width: 100%; background: #101a36; border: 1px solid #30436f; color: #ecf0ff; border-radius: 10px; padding: 10px; }
.previewToggle { display: flex; justify-content: flex-end; }
@media (max-width: 900px) { .detail h2 { font-size: 38px; } }