* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg:#f7f7f4; --fg:#171717; --card:#fff; --border:#e5e5e0;
  --muted:#737373; --accent:#171717;
}
body { background:var(--bg); color:var(--fg); font-family:Inter,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif; line-height:1.6; }
a { color:inherit; text-decoration:none; }
h1 { font-size:44px; letter-spacing:-1px; line-height:1.2; }
h2 { font-size:28px; margin-bottom:8px; }
h3 { font-size:17px; margin-bottom:6px; }

/* nav */
.nav { position:sticky; top:0; z-index:10; background:rgba(247,247,244,.85); backdrop-filter:blur(12px); border-bottom:1px solid var(--border); }
.nav-inner { max-width:1080px; margin:0 auto; padding:12px 20px; display:flex; align-items:center; justify-content:space-between; }
.brand { font-weight:700; font-size:18px; }
.nav-links { display:flex; gap:18px; align-items:center; font-size:14px; }
.nav-links a:hover { opacity:.65; }
.credits { background:#efefe9; border:1px solid var(--border); border-radius:999px; padding:2px 10px; font-size:12px; }

/* buttons */
.btn { display:inline-block; background:var(--accent); color:#fff; padding:10px 22px; border-radius:10px; font-size:15px; border:none; cursor:pointer; }
.btn:hover { opacity:.85; }
.btn.full { width:100%; }
.btn:disabled { opacity:.4; cursor:not-allowed; }
.btn-ghost { display:inline-block; padding:10px 22px; border:1px solid var(--border); border-radius:10px; background:var(--card); }
.btn-sm { background:var(--accent); color:#fff; padding:4px 12px; border-radius:8px; font-size:13px; border:none; cursor:pointer; }
.btn-sm.ghost { background:var(--card); color:var(--fg); border:1px solid var(--border); }

/* hero */
.hero { max-width:1080px; margin:0 auto; padding:72px 20px 40px; text-align:center; }
.badge { display:inline-block; background:#efefe9; border:1px solid var(--border); border-radius:999px; padding:4px 14px; font-size:13px; margin-bottom:20px; }
.hero .sub { max-width:560px; margin:16px auto; color:var(--muted); font-size:16px; }
.hero-actions { display:flex; gap:12px; justify-content:center; margin:24px 0 40px; }
.features { display:flex; gap:40px; justify-content:center; }
.feat { display:flex; flex-direction:column; }
.feat b { font-size:15px; }
.feat span { color:var(--muted); font-size:13px; }

/* sections */
.section { max-width:1080px; margin:0 auto; padding:48px 20px; }
.center { text-align:center; }
.muted { color:var(--muted); }
.small { font-size:13px; }
.grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-top:24px; }
.grid.three { grid-template-columns:repeat(3,1fr); }
.card { background:var(--card); border:1px solid var(--border); border-radius:14px; padding:20px; }
.card p { color:var(--muted); font-size:14px; }
.thumb { height:120px; border-radius:10px; background:linear-gradient(135deg,#e8e8e2,#d4d4cc); margin-bottom:12px; }

/* steps */
.steps { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin:24px 0; }
.step { background:var(--card); border:1px solid var(--border); border-radius:14px; padding:20px; }
.step .num { display:inline-flex; width:26px; height:26px; align-items:center; justify-content:center; background:var(--accent); color:#fff; border-radius:50%; font-size:13px; margin-bottom:10px; }
.step p { color:var(--muted); font-size:13px; margin-top:4px; }

/* pricing */
.price { text-align:center; }
.price-num { font-size:36px; font-weight:700; margin:8px 0 2px; }
.price-credits { font-size:15px; margin-bottom:8px; }
.redeem-box { max-width:420px; margin:24px auto; }
.redeem-box form { display:flex; gap:8px; }
.redeem-box input { flex:1; }
.center-box { max-width:420px; margin:12px auto; }

/* forms */
input, textarea, select { width:100%; padding:10px 12px; border:1px solid var(--border); border-radius:10px; background:var(--card); font-size:14px; font-family:inherit; color:var(--fg); }
input:focus, textarea:focus { outline:2px solid #c9c9c0; border-color:transparent; }
label { display:block; font-size:13px; font-weight:600; margin:14px 0 6px; }
.msg { margin-top:10px; font-size:14px; }
.msg.err { color:#c0392b; }
.msg.ok { color:#1e8e3e; }

/* auth */
.auth-wrap { display:flex; justify-content:center; padding:64px 20px; }
.auth-card { background:var(--card); border:1px solid var(--border); border-radius:16px; padding:32px; width:100%; max-width:380px; }

/* app */
.app-wrap { max-width:1080px; margin:0 auto; padding:32px 20px; display:grid; grid-template-columns:420px 1fr; gap:20px; align-items:start; }
.app-panel { background:var(--card); border:1px solid var(--border); border-radius:16px; padding:24px; }
.opts { display:flex; gap:8px; }
.opt { flex:1; padding:10px 6px; border:1px solid var(--border); border-radius:10px; background:var(--bg); cursor:pointer; font-size:14px; text-align:center; }
.opt.active { border-color:var(--accent); background:#efefe9; }
.opt small { color:var(--muted); }

/* works */
.works-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-top:20px; }
.work { background:var(--card); border:1px solid var(--border); border-radius:12px; overflow:hidden; }
.work img { width:100%; aspect-ratio:1/1; object-fit:cover; display:block; background:#eee; }
.work-desc { padding:10px 12px; font-size:13px; color:var(--muted); max-height:60px; overflow:hidden; }
.work-actions { padding:0 12px 12px; display:flex; gap:8px; }

/* admin */
.admin-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:20px; }
.stack > * { margin-bottom:10px; }
.row { display:grid; grid-template-columns:2fr 1fr 1fr 3fr; gap:8px; }
.table { width:100%; border-collapse:collapse; margin-top:12px; font-size:13px; }
.table th, .table td { text-align:left; padding:6px 8px; border-bottom:1px solid var(--border); }
.clip { max-width:180px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
code { background:#efefe9; padding:2px 6px; border-radius:6px; font-size:12px; }

/* footer */
.footer { border-top:1px solid var(--border); margin-top:48px; }
.footer-inner { max-width:1080px; margin:0 auto; padding:24px 20px; display:flex; justify-content:space-between; font-size:13px; color:var(--muted); }

@media (max-width: 860px) {
  h1 { font-size:32px; }
  .grid, .works-grid, .grid.three { grid-template-columns:1fr 1fr; }
  .steps { grid-template-columns:1fr 1fr; }
  .app-wrap, .admin-grid { grid-template-columns:1fr; }
  .features { flex-direction:column; gap:12px; }
  .row { grid-template-columns:1fr 1fr; }
}