/* 通千算智商业服务平台 官网样式 */
:root {
  --primary: #e8541e;
  --primary-dark: #c74414;
  --primary-soft: #fdeee6;
  --ink: #1f1a17;
  --ink-2: #6b625c;
  --bg: #f7f5f2;
  --card: #fff;
  --line: #ece7e1;
  --ok: #1a9e5c;
  --warn: #d97706;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.65;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; }
a { color: var(--primary); text-decoration: none; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 18px; }

/* 导航 */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line); }
.nav .in { max-width: 1080px; margin: 0 auto; padding: 12px 18px; display: flex; align-items: center; gap: 18px; }
.brand { font-weight: 900; font-size: 1.05rem; letter-spacing: .5px; white-space: nowrap; }
.brand em { color: var(--primary); font-style: normal; }
.nav .links { display: flex; gap: 16px; margin-left: auto; align-items: center; }
.nav .links a { color: var(--ink-2); font-size: .92rem; white-space: nowrap; }
.nav .links a:hover { color: var(--primary); }
.nav .cta { background: var(--primary); color: #fff !important; padding: 8px 18px; border-radius: 999px; font-weight: 700; }
@media (max-width: 640px) { .nav .links a:not(.cta) { display: none; } }

/* Hero */
.hero { position: relative; overflow: hidden;
  background: linear-gradient(160deg, #fff7f0 0%, #fdeee6 55%, #f9dfd0 100%); padding: 72px 0 60px; }
.hero::after { content: ""; position: absolute; right: -140px; top: -140px; width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(232,84,30,.16), transparent 65%); }
.hero .kicker { display: inline-block; background: #fff; border: 1px solid #f3d9c8; color: var(--primary-dark);
  font-size: .82rem; padding: 4px 14px; border-radius: 999px; font-weight: 600; }
.hero h1 { font-size: clamp(1.7rem, 4.6vw, 2.9rem); line-height: 1.25; margin: 18px 0 14px; font-weight: 900; }
.hero h1 em { color: var(--primary); font-style: normal; }
.hero p.lead { font-size: clamp(.95rem, 2vw, 1.12rem); color: var(--ink-2); max-width: 640px; margin: 0 0 26px; }
.hero .btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 26px; border-radius: 12px;
  font-weight: 800; font-size: 1rem; border: none; cursor: pointer; }
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(232,84,30,.3); }
.btn.ghost { background: #fff; color: var(--ink); border: 1.5px solid var(--line); }
.hero .tags { margin-top: 20px; display: flex; gap: 8px; flex-wrap: wrap; }
.hero .tags span { font-size: .78rem; background: #fff; border: 1px solid var(--line); color: var(--ink-2);
  padding: 3px 12px; border-radius: 999px; }

/* 数据带 */
.stats { background: #fff; border-block: 1px solid var(--line); }
.stats .in { max-width: 1080px; margin: 0 auto; padding: 26px 18px; display: grid;
  grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
@media (max-width: 640px) { .stats .in { grid-template-columns: repeat(2, 1fr); } }
.stats b { display: block; font-size: clamp(1.3rem, 3vw, 1.9rem); color: var(--primary); }
.stats span { font-size: .82rem; color: var(--ink-2); }

/* 区块通用 */
section { padding: 58px 0; }
.sec-head { text-align: center; margin-bottom: 30px; }
.sec-head h2 { font-size: clamp(1.3rem, 3vw, 1.8rem); margin: 0 0 8px; }
.sec-head p { color: var(--ink-2); margin: 0; font-size: .95rem; }

/* 工具网格 */
.tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 860px) { .tools { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .tools { grid-template-columns: 1fr; } }
.tool { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px 18px;
  box-shadow: 0 1px 3px rgba(31,26,23,.05); transition: transform .15s, box-shadow .15s; }
.tool:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(31,26,23,.08); }
.tool .icon { font-size: 1.9rem; }
.tool h3 { margin: 10px 0 6px; font-size: 1.02rem; }
.tool p { margin: 0; color: var(--ink-2); font-size: .86rem; line-height: 1.6; }
.tool .free { display: inline-block; margin-top: 10px; font-size: .72rem; padding: 2px 10px; border-radius: 999px; }
.tool .free.yes { color: var(--ok); background: #e7f6ee; }
.tool .free.no { color: var(--warn); background: #fdf3e2; }

/* 三步 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 700px) { .steps { grid-template-columns: 1fr; } }
.step { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 24px 20px; text-align: center; }
.step .no { width: 40px; height: 40px; border-radius: 50%; background: var(--primary-soft); color: var(--primary-dark);
  font-weight: 900; display: inline-flex; align-items: center; justify-content: center; font-size: 1.1rem; }
.step h3 { margin: 12px 0 6px; font-size: 1rem; }
.step p { margin: 0; color: var(--ink-2); font-size: .88rem; }

/* 更新日志 */
.logwrap { background: #fff; border-block: 1px solid var(--line); }
.timeline { max-width: 760px; margin: 0 auto; }
.ver { border-left: 3px solid #f0d9ca; padding: 0 0 26px 22px; position: relative; }
.ver::before { content: ""; position: absolute; left: -8.5px; top: 4px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--primary); border: 3px solid #fff; box-shadow: 0 0 0 1px #f0d9ca; }
.ver .vh { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.ver .vh b { font-size: 1.02rem; }
.ver .vh .vtag { background: var(--primary-soft); color: var(--primary-dark); font-size: .74rem; font-weight: 800;
  padding: 2px 10px; border-radius: 999px; }
.ver .vh time { color: var(--ink-2); font-size: .8rem; }
.ver ul { margin: 10px 0 0; padding: 0; list-style: none; }
.ver li { font-size: .9rem; color: var(--ink-2); padding: 3px 0; }
.ver li::before { content: "·"; color: var(--primary); font-weight: 900; margin-right: 8px; }

/* 价格 */
.fb-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 22px; align-items: start; }
@media (max-width: 760px) { .fb-grid { grid-template-columns: 1fr; } }
.price-card, .price-cards .pc { background: #fff; border: 1px solid var(--line); border-radius: 16px;
  padding: 22px 20px; box-shadow: 0 1px 3px rgba(31,26,23,.05); }
.price-card.hl, .price-cards .pc.hl { border: 2px solid var(--primary); }
.price-card h3, .pc h3 { margin: 0 0 6px; font-size: 1.02rem; }
.price-card .pv, .pc .pv { color: var(--primary); font-weight: 800; margin-bottom: 10px; }
.price-card ul, .pc ul { margin: 0 0 14px; padding: 0 0 0 2px; list-style: none; }
.price-card li, .pc li { font-size: .88rem; color: var(--ink-2); padding: 3px 0; }
.price-card li::before, .pc li::before { content: "✔"; color: var(--ok); margin-right: 8px; font-weight: 900; }
.price-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 640px) { .price-cards { grid-template-columns: 1fr; } }
.price-cards .pc { padding: 16px 14px; }
.price-cards .pc .pv { font-size: .92rem; }
.price-cards .pc li { font-size: .8rem; }
.pnote { font-size: .78rem; color: var(--ink-2); margin-top: 10px; }
.price-table-wrap { margin-top: 22px; background: #fff; border: 1px solid var(--line); border-radius: 16px;
  padding: 18px 20px; overflow-x: auto; }
.price-table { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 420px; }
.price-table th, .price-table td { text-align: left; padding: 8px 8px; border-bottom: 1px solid var(--line); }
.price-table th { color: var(--ink-2); font-weight: 600; white-space: nowrap; }
.price-table td b { color: var(--primary); }

/* 反馈 */
.fb-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 22px; align-items: start; }
@media (max-width: 760px) { .fb-grid { grid-template-columns: 1fr; } }
.fb-side { color: var(--ink-2); font-size: .92rem; }
.fb-side h3 { color: var(--ink); margin: 0 0 8px; font-size: 1.05rem; }
.fb-card { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 22px 20px;
  box-shadow: 0 1px 3px rgba(31,26,23,.05); }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: .88rem; font-weight: 600; margin-bottom: 6px; }
select, input[type=text], textarea { width: 100%; padding: 11px 12px; font-size: .95rem; border: 1.5px solid var(--line);
  border-radius: 10px; background: #fbfaf8; outline: none; font-family: inherit; }
select:focus, input:focus, textarea:focus { border-color: var(--primary); }
textarea { min-height: 110px; resize: vertical; }
#fb-msg { margin-top: 10px; font-size: .88rem; display: none; padding: 10px 12px; border-radius: 10px; }
#fb-msg.ok { display: block; background: #e7f6ee; color: var(--ok); }
#fb-msg.err { display: block; background: #fdeaea; color: #a32222; }

/* 页脚 */
footer { background: #14100e; color: #b7aca4; padding: 34px 0; font-size: .85rem; }
footer .in { max-width: 1080px; margin: 0 auto; padding: 0 18px; display: flex; gap: 14px; flex-wrap: wrap;
  align-items: center; justify-content: space-between; }
footer a { color: #e8ddd5; }
footer .brand { color: #fff; }