:root {
    --nk-bg: #faf8f5;
    --nk-surface: #ffffff;
    --nk-line: #e7e5e4;
    --nk-pencil: #292524;
    --nk-ink-blue: #1d4ed8;
    --nk-shadow: 4px 4px 0px rgba(41, 37, 36, 0.1);
    --nk-shadow-hover: 6px 6px 0px rgba(29, 78, 216, 0.15);
    --nk-radius: 4px;
    --nk-price: #ef4444;
}
body { margin: 0; background-color: var(--nk-bg); background-image: linear-gradient(var(--nk-line) 1px, transparent 1px); background-size: 100% 28px; color: var(--nk-pencil); font-family: "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
.nk-header { background-color: var(--nk-surface); border-bottom: 2px solid var(--nk-pencil); padding: 18px 0; }
.nk-nav-inner { max-width: 1400px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; box-sizing: border-box; }
.nk-logo img { height: 26px; filter: grayscale(1) contrast(1.2) brightness(0.9); }
.nk-menu { display: flex; gap: 35px; }
.nk-menu a { text-decoration: none; color: var(--nk-pencil); font-weight: 700; font-size: 14px; transition: 0.3s; }
.nk-menu a:hover { color: var(--nk-ink-blue); }
.nk-container { max-width: 1400px; margin: 40px auto; padding: 0 24px; box-sizing: border-box; }
.nk-notice { background: var(--nk-surface); border-radius: var(--nk-radius); border: 1px solid var(--nk-pencil); padding: 18px 24px; box-shadow: var(--nk-shadow); font-size: 13px; color: var(--nk-pencil); line-height: 1.6; display: flex; align-items: center; gap: 12px; position: relative; }
.nk-notice::before { content: "[手账公告]"; position: absolute; top: -10px; left: 15px; background: var(--nk-pencil); color: var(--nk-surface); font-size: 9px; padding: 1px 6px; font-weight: bold; }
.nk-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 16px; }
.nk-card { background-color: var(--nk-surface); border: 1px solid var(--nk-pencil); border-radius: var(--nk-radius); padding: 16px; text-decoration: none; transition: all 0.2s ease-in-out; box-shadow: var(--nk-shadow); display: flex; flex-direction: column; position: relative; overflow: hidden; }
.nk-card:hover { transform: translate(-2px, -2px); border-color: var(--nk-ink-blue); box-shadow: var(--nk-shadow-hover); }
.nk-img-box { width: 100%; aspect-ratio: 1; background: #faf9f6; border: 1px dashed var(--nk-line); display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }
.nk-img-box img { width: 60%; height: 60%; object-fit: contain; opacity: 0.85; transition: 0.3s; }
.nk-card:hover .nk-img-box img { opacity: 1; transform: scale(1.04); }
.nk-name { font-size: 13px; font-weight: 700; color: var(--nk-pencil); height: 38px; line-height: 1.4; overflow: hidden; margin-bottom: 12px; }
.nk-meta { display: flex; justify-content: space-between; align-items: center; margin-top: auto; border-top: 1px dashed var(--nk-line); padding-top: 10px; }
.nk-price { color: var(--nk-price); font-weight: 800; font-size: 16px; }
.nk-sell { font-size: 11px; color: var(--nk-pencil); opacity: 0.7; }
.nk-tag { position: absolute; top: 12px; left: 12px; background: var(--nk-ink-blue); color: var(--nk-surface); font-size: 10px; padding: 2px 6px; border-radius: 2px; font-weight: bold; }
.nk-detail-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; }
.nk-box { background: var(--nk-surface); border-radius: var(--nk-radius); padding: 35px; border: 1px solid var(--nk-pencil); box-shadow: var(--nk-shadow); }
.nk-h1 { font-size: 24px; font-weight: 800; margin: 0 0 20px 0; color: var(--nk-pencil); border-bottom: 1px dashed var(--nk-line); padding-bottom: 12px; }
.nk-input { width: 100%; height: 46px; background: #faf9f6; border: 1px solid var(--nk-pencil); border-radius: 4px; padding: 0 15px; font-size: 14px; box-sizing: border-box; outline: none; transition: 0.3s; margin-top: 8px; color: var(--nk-pencil); }
.nk-input:focus { border-color: var(--nk-ink-blue); background: var(--nk-surface); box-shadow: var(--nk-shadow-hover); }
.nk-label { display: block; font-size: 12px; font-weight: 700; color: var(--nk-pencil); opacity: 0.8; }
.nk-btn { width: 100%; height: 50px; background: var(--nk-pencil); color: var(--nk-surface); border: none; border-radius: 4px; font-size: 15px; font-weight: 700; cursor: pointer; transition: 0.3s; margin-top: 20px; }
.nk-btn:hover { background: var(--nk-ink-blue); transform: translate(-2px, -2px); box-shadow: var(--nk-shadow-hover); }
.nk-footer { background: var(--nk-surface); border-top: 2px solid var(--nk-pencil); padding: 50px 0; margin-top: 80px; text-align: center; }
@media (max-width: 1400px) { .nk-grid { grid-template-columns: repeat(5, 1fr); } }
@media (max-width: 1000px) { .nk-grid { grid-template-columns: repeat(3, 1fr); } .nk-detail-grid { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .nk-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }