/* WXDHCO 吴溪工具 — 前台样式 (2026-08-30 重写; 2026-08-31 深色模式) */
:root{
  --primary:#2563eb; --primary-dark:#1d4ed8; --primary-light:#dbeafe;
  --bg:#f8fafc; --card:#ffffff; --text:#0f172a; --text2:#64748b; --border:#e2e8f0;
  --green:#16a34a; --amber:#d97706; --radius:12px; --shadow:0 1px 3px rgba(15,23,42,.08),0 4px 16px rgba(15,23,42,.05);
  --surface:#ffffff; --surface-hover:#f1f5f9; --header-bg:rgba(255,255,255,.92); --footer-bg:#0f172a; --footer-text:#94a3b8; --footer-link:#cbd5e1;
}
:root[data-theme="dark"]{
  --primary:#3b82f6; --primary-dark:#60a5fa; --primary-light:rgba(59,130,246,.18);
  --bg:#0b1220; --card:#111a2c; --text:#e6edf7; --text2:#8b9bb4; --border:#243149;
  --shadow:0 1px 3px rgba(0,0,0,.4),0 4px 16px rgba(0,0,0,.3);
  --surface:#111a2c; --surface-hover:#1a2740; --header-bg:rgba(11,18,32,.92);
  --footer-bg:#070d18; --footer-text:#7c8ba6; --footer-link:#aebdd4;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--primary);text-decoration:none}
img{max-width:100%}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
/* ===== 头部 ===== */
header{position:sticky;top:0;z-index:100;background:var(--header-bg);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text)}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:7px 13px;border-radius:8px;font-size:14px;color:var(--text2);font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:var(--primary-light)}
.lang-toggle{margin-left:10px;padding:6px 12px;border:1px solid var(--border);border-radius:8px;background:var(--surface);font-size:13px;cursor:pointer;color:var(--text2);font-weight:600}
.lang-toggle:hover{border-color:var(--primary);color:var(--primary)}
.theme-toggle{margin-left:6px;padding:6px 11px;border:1px solid var(--border);border-radius:8px;background:var(--surface);font-size:14px;cursor:pointer;color:var(--text2);line-height:1}
.theme-toggle:hover{border-color:var(--primary)}
/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 55%,#7c3aed 100%);color:#fff;padding:64px 0 72px;text-align:center}
.hero h1{font-size:38px;font-weight:800;letter-spacing:-.5px;margin-bottom:14px}
.hero p.sub{font-size:16px;opacity:.92;max-width:640px;margin:0 auto 34px}
.hero .stat-row{display:flex;justify-content:center;gap:40px;margin-top:40px;flex-wrap:wrap}
.hero .stat b{display:block;font-size:26px}
.hero .stat span{font-size:13px;opacity:.8}
/* ===== 快捷换算 ===== */
.quick-convert{max-width:680px;margin:-44px auto 0;background:var(--card);border-radius:16px;box-shadow:var(--shadow);padding:22px;text-align:left}
.qc-row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.qc-field{flex:1;min-width:120px}
.qc-field label{display:block;font-size:12px;color:var(--text2);margin-bottom:5px;font-weight:600}
.qc-field input,.qc-field select,.conv input,.conv select{width:100%;padding:11px 12px;border:1.5px solid var(--border);border-radius:10px;font-size:15px;background:var(--surface);color:var(--text);outline:none;transition:border .15s}
.qc-field input:focus,.qc-field select:focus,.conv input:focus,.conv select:focus{border-color:var(--primary)}
.qc-arrow{padding:11px 0;font-size:18px;color:var(--primary);font-weight:700}
.qc-result{margin-top:14px;padding:12px 14px;background:var(--primary-light);border-radius:10px;font-size:15px;color:var(--primary-dark);font-weight:600}
/* ===== 区块通用 ===== */
section.block{padding:56px 0}
.sec-head{text-align:center;margin-bottom:34px}
.sec-head h2{font-size:27px;font-weight:800;letter-spacing:-.3px}
.sec-head p{color:var(--text2);font-size:14.5px;margin-top:8px}
/* ===== 分类网格 ===== */
.group-title{display:flex;align-items:center;gap:10px;margin:30px 0 16px;font-size:15px;font-weight:700;color:var(--text2)}
.group-title:first-of-type{margin-top:0}
.group-title::after{content:"";flex:1;height:1px;background:var(--border)}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:14px}
.cat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 16px;cursor:pointer;transition:all .18s;text-align:left}
.cat-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-3px)}
.cat-card .icon{font-size:27px;margin-bottom:10px}
.cat-card .name{font-size:15px;font-weight:700;color:var(--text)}
.cat-card .cnt{font-size:12px;color:var(--text2);margin-top:3px}
/* ===== 世界时间 ===== */
.time-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.time-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;text-align:center}
.time-card .tz{font-size:12.5px;color:var(--text2);font-weight:600}
.time-card .tm{font-size:17px;font-weight:700;color:var(--text);font-variant-numeric:tabular-nums;margin-top:5px}
.time-card .dt{font-size:11.5px;color:var(--text2)}
/* ===== 特性 ===== */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.feat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.feat-card .icon{font-size:26px;margin-bottom:10px}
.feat-card h3{font-size:15.5px;font-weight:700;margin-bottom:7px}
.feat-card p{font-size:13.5px;color:var(--text2)}
/* ===== 版本时间线 ===== */
.timeline{max-width:680px;margin:0 auto}
.tl-item{position:relative;padding:0 0 26px 30px;border-left:2px solid var(--border)}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:"";position:absolute;left:-7px;top:4px;width:12px;height:12px;border-radius:50%;background:var(--primary);border:2.5px solid var(--card);box-shadow:0 0 0 1.5px var(--primary)}
.tl-item .ver{display:inline-block;font-size:12px;font-weight:700;color:var(--primary);background:var(--primary-light);padding:2px 9px;border-radius:20px;margin-right:8px}
.tl-item .date{font-size:12.5px;color:var(--text2);margin-bottom:5px;display:inline-block}
.tl-item h3{font-size:15.5px;font-weight:700}
.tl-item p{font-size:13.5px;color:var(--text2);margin-top:5px}
/* ===== 友情链接 ===== */
.friend-grid{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.friend-card{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 20px;transition:all .18s}
.friend-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}
.friend-card .f-icon{width:40px;height:40px;border-radius:10px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:18px;flex:none;overflow:hidden}
.friend-card .f-logo{width:28px;height:28px;border-radius:6px;object-fit:contain;background:#fff}
.friend-card .f-name{font-size:14.5px;font-weight:700;color:var(--text)}
.friend-card .f-desc{font-size:12px;color:var(--text2);margin-top:2px}
/* ===== 联系 ===== */
.contact-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:30px;display:flex;flex-wrap:wrap;gap:24px;justify-content:center}
.contact-item{display:flex;align-items:center;gap:10px;font-size:14.5px}
.contact-item .ic{width:38px;height:38px;border-radius:10px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:17px}
/* ===== 换算工具页 ===== */
.conv-page{background:var(--bg);min-height:calc(100vh - 60px)}
.conv-head{padding:34px 0 6px;text-align:center}
.conv-head .icon{font-size:40px}
.conv-head h1{font-size:24px;font-weight:800;margin-top:6px}
.conv-head p{color:var(--text2);font-size:14px;margin-top:4px}
.conv{max-width:640px;margin:26px auto;background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:24px}
.conv-row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.conv .swap{padding:11px;border:1.5px solid var(--border);border-radius:10px;background:var(--surface);cursor:pointer;font-size:16px;color:var(--primary)}
.conv .swap:hover{border-color:var(--primary)}
.conv-result{margin-top:18px;text-align:center}
.conv-result .big{font-size:30px;font-weight:800;color:var(--primary-dark);word-break:break-all}
.conv-result .formula{font-size:13px;color:var(--text2);margin-top:8px}
.share-btn{margin-top:12px;padding:8px 16px;border:1.5px solid var(--border);border-radius:9px;background:var(--surface);cursor:pointer;font-size:13px;color:var(--primary)}
.share-btn:hover{border-color:var(--primary);background:var(--primary-light,#eef2ff)}
.all-conv{margin-top:22px}
.all-conv h3{font-size:14px;font-weight:700;color:var(--text2);margin-bottom:10px}
.all-conv .row{display:flex;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--border);font-size:13.5px}
.all-conv .row:last-child{border-bottom:none}
.all-conv .row .u{color:var(--text2)}
.all-conv .row .v{font-weight:600;font-variant-numeric:tabular-nums;word-break:break-all}
/* ===== 页脚 ===== */
footer{background:var(--footer-bg);color:var(--footer-text);padding:34px 0;text-align:center;font-size:13px}
footer .fnav{display:flex;justify-content:center;gap:22px;margin-bottom:14px;flex-wrap:wrap}
footer a{color:var(--footer-link)}
footer a:hover{color:#fff}
footer .admin{margin-top:10px;font-size:12px}
/* ===== 响应式 ===== */
@media(max-width:640px){
  .hero h1{font-size:28px}
  .nav-links a{padding:6px 8px;font-size:13px}
  .qc-row .qc-arrow{display:none}
  .conv-result .big{font-size:24px}
}