/* JJTalk 叽叽聊官网 · 与客户端同源色板 */
:root{
  --yellow:#F0B429; --yellow-light:#F7D98A; --yellow-deep:#96690A;
  --coral:#D96F5F; --coral-deep:#D4675A;
  --bg:#FAF7F2; --panel:#FFFFFF; --soft:#FDF4E2;
  --ink:#2B2724; --ink2:#4A423B; --brown:#5D4037; --muted:#968E85;
  --line:#EAE1D4; --blue:#4A8FC0; --green:#3E9B72;
  --radius:18px; --radius-lg:28px;
  --shadow:0 10px 30px rgba(43,39,36,.07);
  --shadow-lg:0 24px 60px rgba(43,39,36,.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

/* ===== 导航 ===== */
header{position:sticky;top:0;z-index:50;background:rgba(250,247,242,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:11px;font-size:21px;font-weight:800;letter-spacing:-.5px}
.logo .mark{width:40px;height:40px;display:flex;align-items:center;justify-content:center;filter:drop-shadow(0 3px 8px rgba(240,180,41,.35))}
.logo .mark img,.side .brand .mk img{width:100%;height:100%;object-fit:contain}
.logo small{font-size:12px;font-weight:500;color:var(--muted);letter-spacing:1px;display:block;line-height:1.1}
.nav-links{display:flex;gap:34px;font-size:15px;color:var(--ink2);font-weight:500}
.nav-links a{position:relative;padding:6px 0;transition:color .2s}
.nav-links a:hover{color:var(--yellow-deep)}
.nav-cta{display:flex;gap:12px;align-items:center}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:14px;padding:11px 22px;font-size:15px;font-weight:600;transition:transform .15s, box-shadow .15s;cursor:pointer;border:none}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--yellow-light),var(--yellow));color:var(--brown);box-shadow:0 6px 18px rgba(240,180,41,.4)}
.btn-ghost{background:var(--panel);color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--yellow)}
.btn-sm{padding:7px 14px;font-size:13px;border-radius:10px}
.btn-danger{background:#FBE9E5;color:var(--coral-deep)}
.menu-btn{display:none;background:none;border:none;color:var(--ink);cursor:pointer}

/* ===== Hero ===== */
.hero{padding:86px 0 40px;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.hero-brand{display:flex;align-items:center;gap:16px;margin-bottom:22px}
.hero-logo{width:96px;height:96px;object-fit:contain;filter:drop-shadow(0 10px 24px rgba(240,180,41,.4));margin-bottom:0}
.hero .tag{display:inline-flex;align-items:center;gap:8px;background:var(--soft);border:1px solid var(--line);color:var(--yellow-deep);font-size:13px;font-weight:600;border-radius:999px;padding:7px 16px;margin-bottom:0}
.hero h1{font-size:52px;line-height:1.22;letter-spacing:-1.5px;font-weight:800}
.hero h1 .hl{background:linear-gradient(135deg,var(--yellow-light),var(--yellow));padding:0 8px;border-radius:12px;color:var(--brown)}
.hero p.sub{margin:22px 0 34px;font-size:18px;color:var(--ink2);max-width:520px}
.hero .dl{display:flex;gap:14px;flex-wrap:wrap}
.dl-card{display:flex;align-items:center;gap:13px;background:var(--panel);border:1.5px solid var(--line);border-radius:16px;padding:13px 22px;transition:border-color .2s, transform .2s}
.dl-card:hover{border-color:var(--yellow);transform:translateY(-2px)}
.dl-card svg{width:26px;height:26px;color:var(--yellow-deep)}
.dl-card .t{font-size:15px;font-weight:700;line-height:1.3}
.dl-card .s{font-size:12px;color:var(--muted)}
.hero .meta{margin-top:30px;display:flex;gap:26px;color:var(--muted);font-size:13.5px}
.hero .meta span{display:flex;align-items:center;gap:7px}
.hero .meta svg{width:16px;height:16px;color:var(--green)}

/* 手机样机 */
.phone{width:320px;margin:0 auto;background:var(--ink);border-radius:44px;padding:12px;box-shadow:var(--shadow-lg)}
.screen{background:var(--bg);border-radius:34px;overflow:hidden}
.screen .bar{background:linear-gradient(135deg,var(--yellow-light),var(--yellow));padding:16px 18px 12px;color:var(--brown);font-weight:700;font-size:15px;display:flex;align-items:center;gap:9px}
.screen .bar .dot{width:34px;height:34px;border-radius:11px;background:rgba(255,255,255,.75);display:flex;align-items:center;justify-content:center}
.screen .bar .st{font-size:11px;font-weight:500;opacity:.8;display:block}
.chat{padding:16px 14px 20px;display:flex;flex-direction:column;gap:10px;min-height:330px}
.msg{max-width:78%;padding:9px 13px;border-radius:15px;font-size:13px;line-height:1.5;box-shadow:0 1px 3px rgba(43,39,36,.06)}
.msg.them{background:#fff;color:var(--ink2);border-bottom-left-radius:5px;align-self:flex-start}
.msg.mine{background:linear-gradient(135deg,var(--yellow-light),var(--yellow));color:var(--brown);border-bottom-right-radius:5px;align-self:flex-end}
.msg .time{display:block;font-size:10px;opacity:.55;margin-top:3px;text-align:right}
.typing{align-self:flex-start;background:#fff;border-radius:15px;padding:11px 14px;display:flex;gap:5px;box-shadow:0 1px 3px rgba(43,39,36,.06)}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--muted);opacity:.5;animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:.9}}
.inputbar{display:flex;gap:8px;padding:10px 12px 14px}
.inputbar .field{flex:1;background:#fff;border-radius:999px;padding:9px 16px;font-size:12px;color:var(--muted)}
.inputbar .send{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--yellow-light),var(--yellow));display:flex;align-items:center;justify-content:center;color:var(--brown)}

/* ===== section 通用 ===== */
section{padding:84px 0}
.sec-head{text-align:center;max-width:640px;margin:0 auto 54px}
.sec-head .kicker{font-size:13px;font-weight:700;letter-spacing:3px;color:var(--yellow-deep);text-transform:uppercase}
.sec-head h2{font-size:36px;letter-spacing:-1px;margin:10px 0 14px;font-weight:800}
.sec-head p{color:var(--muted);font-size:16px}

/* 功能网格 */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--panel);border:1.5px solid var(--line);border-radius:var(--radius);padding:30px 28px;transition:transform .2s, box-shadow .2s, border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--yellow-light)}
.card .ic{width:52px;height:52px;border-radius:15px;display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.card .ic svg{width:24px;height:24px}
.ic.y{background:var(--soft);color:var(--yellow-deep)}
.ic.c{background:#FBE9E5;color:var(--coral-deep)}
.ic.b{background:#E8F1F8;color:var(--blue)}
.ic.g{background:#E5F3EC;color:var(--green)}
.ic.k{background:#EFEBE7;color:var(--brown)}
.card h3{font-size:18px;margin-bottom:9px;font-weight:700}
.card p{font-size:14.5px;color:var(--muted)}

/* E2EE 深色带 */
.e2ee{background:var(--ink);border-radius:var(--radius-lg);color:#fff;padding:64px 60px;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;position:relative;overflow:hidden}
.e2ee::after{content:"";position:absolute;right:-120px;top:-120px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(240,180,41,.22),transparent 70%)}
.e2ee .kicker{color:var(--yellow);font-size:13px;font-weight:700;letter-spacing:3px}
.e2ee h2{font-size:32px;margin:12px 0 16px;letter-spacing:-1px}
.e2ee p{color:rgba(255,255,255,.72);font-size:15.5px}
.e2ee ul{list-style:none;margin-top:24px;display:flex;flex-direction:column;gap:12px}
.e2ee li{display:flex;gap:11px;align-items:flex-start;font-size:14.5px;color:rgba(255,255,255,.88)}
.e2ee li svg{width:19px;height:19px;color:var(--yellow);flex-shrink:0;margin-top:3px}
.enc-demo{background:#37322D;border:1px solid rgba(255,255,255,.09);border-radius:20px;padding:28px;font-family:ui-monospace,Consolas,monospace;font-size:13px;position:relative;z-index:1}
.enc-demo .row{display:flex;justify-content:space-between;color:rgba(255,255,255,.55);margin-bottom:14px;font-size:12px}
.enc-demo .plain{background:rgba(62,155,114,.14);border:1px solid rgba(62,155,114,.4);color:#9BD9BC;border-radius:10px;padding:11px 14px;margin-bottom:14px;word-break:break-all}
.enc-demo .arrow{color:var(--yellow);text-align:center;margin-bottom:14px;font-size:16px}
.enc-demo .cipher{background:rgba(217,111,95,.12);border:1px solid rgba(217,111,95,.4);color:#EDA99D;border-radius:10px;padding:11px 14px;word-break:break-all}

/* 下载区 */
.dlgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dl-tile{background:var(--panel);border:1.5px solid var(--line);border-radius:var(--radius);padding:34px 28px;text-align:center;transition:transform .2s, box-shadow .2s}
.dl-tile:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.dl-tile .ic{width:62px;height:62px;border-radius:18px;margin:0 auto 18px;display:flex;align-items:center;justify-content:center}
.dl-tile .ic svg{width:30px;height:30px}
.dl-tile h3{font-size:19px;margin-bottom:6px}
.dl-tile .v{font-size:13px;color:var(--muted);margin-bottom:20px}
.dl-tile .btn{width:100%;justify-content:center}
.dl-tile .btn[aria-disabled="true"]{opacity:.55;pointer-events:none}

/* 公告列表 */
.notices{max-width:760px;margin:44px auto 0;display:flex;flex-direction:column;gap:12px}
.notice{display:flex;gap:16px;align-items:baseline;background:var(--panel);border:1.5px solid var(--line);border-radius:14px;padding:15px 22px}
.notice .d{font-size:12.5px;color:var(--muted);white-space:nowrap;font-family:ui-monospace,Consolas,monospace}
.notice .t{font-size:14.5px;color:var(--ink2);font-weight:600}
.notice .b{font-size:13.5px;color:var(--muted)}

/* 页首公告条 */
.notice-bar{background:var(--soft);border-bottom:1.5px solid var(--line);padding:9px 0}
.notice-bar .wrap{display:flex;flex-direction:column;gap:5px}
.nb-item{display:flex;gap:12px;align-items:baseline;font-size:13px;line-height:1.5;min-width:0}
.nb-tag{flex:none;font-size:11.5px;font-weight:700;color:#7A5A0A;background:var(--yellow);border-radius:6px;padding:1.5px 8px;letter-spacing:1px}
.nb-item .d{flex:none;font-size:12px;color:var(--muted);font-family:ui-monospace,Consolas,monospace}
.nb-item .t{flex:none;font-weight:600;color:var(--ink2)}
.nb-item .b{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
@media (max-width:720px){
  .nb-item .b{display:none}
  .nb-item .d{display:none}
}

/* 反馈表单 */
.fb{max-width:640px;margin:0 auto;background:var(--panel);border:1.5px solid var(--line);border-radius:var(--radius);padding:36px 34px}
.fb .row{margin-bottom:16px}
.fb label{display:block;font-size:13.5px;font-weight:600;color:var(--ink2);margin-bottom:7px}
.fb input,.fb textarea{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:11px 15px;font-size:14.5px;font-family:inherit;background:var(--bg);color:var(--ink);transition:border-color .2s}
.fb input:focus,.fb textarea:focus{outline:none;border-color:var(--yellow)}
.fb textarea{min-height:110px;resize:vertical}
.fb .hp{position:absolute;left:-9999px}
.fb .ok{background:#E5F3EC;color:var(--green);border-radius:12px;padding:12px 16px;font-size:14px;margin-bottom:18px}
.fb .req{color:var(--coral)}

/* 页脚 */
footer{background:var(--ink);color:rgba(255,255,255,.65);padding:50px 0 28px;margin-top:40px}
.f-main{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px 40px;margin-bottom:36px}
.f-main .logo{color:#fff}
.f-main .logo small{color:rgba(255,255,255,.45)}
.f-main p{font-size:13px;max-width:300px;margin-top:12px;color:rgba(255,255,255,.5);line-height:1.7}
.f-links{display:flex;flex-wrap:wrap;gap:10px 28px;font-size:13.5px;align-items:center}
.f-links a{color:rgba(255,255,255,.65);transition:color .2s}
.f-links a:hover{color:var(--yellow)}
.f-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 16px;font-size:12px;color:rgba(255,255,255,.4)}
@media (max-width:720px){
  footer{padding:42px 0 24px}
  .f-main{flex-direction:column;align-items:center;text-align:center;gap:20px;margin-bottom:26px}
  .f-main p{margin-inline:auto}
  .f-links{justify-content:center;gap:8px 20px;padding-top:0}
  .f-bottom{flex-direction:column;align-items:center;text-align:center;gap:6px;padding-top:18px}
}

/* ===== 后台 ===== */
.abody{background:#FAF9F6;min-height:100vh}
.a-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.a-top h4{font-size:19px}
.a-top .crumb{font-size:12px;color:var(--muted)}
.alayout{display:grid;grid-template-columns:210px 1fr;min-height:100vh}
.side{background:#2F2A26;color:rgba(255,255,255,.85);padding:22px 14px;position:sticky;top:0;height:100vh}
.side .brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15px;color:#fff;margin-bottom:26px;padding:0 8px}
.side .brand .mk{width:28px;height:28px;display:flex;align-items:center;justify-content:center}
.side a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;color:rgba(255,255,255,.62);margin-bottom:3px;font-size:13.5px}
.side a svg{width:16px;height:16px}
.side a:hover{color:#fff}
.side a.on{background:rgba(240,180,41,.16);color:var(--yellow)}
.side .out{margin-top:18px;border-top:1px solid rgba(255,255,255,.08);padding-top:14px}
.amain{padding:26px 30px;max-width:1100px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
.stat{background:#fff;border:1px solid var(--line);border-radius:13px;padding:16px 18px}
.stat .l{font-size:12px;color:var(--muted);margin-bottom:5px}
.stat .n{font-size:23px;font-weight:800;letter-spacing:-.5px}
.stat .d{font-size:11.5px;margin-top:4px}
.stat .d.up{color:var(--green)}.stat .d.warn{color:var(--coral)}
.atable{background:#fff;border:1px solid var(--line);border-radius:13px;overflow:hidden;margin-bottom:20px}
.atable table{width:100%;border-collapse:collapse;font-size:13px}
.atable th{background:#F5F1EA;text-align:left;padding:11px 16px;font-size:12px;color:var(--ink2);font-weight:600}
.atable td{padding:11px 16px;border-top:1px solid var(--line);color:var(--ink2);vertical-align:top}
.pill{display:inline-block;border-radius:999px;padding:2px 11px;font-size:11.5px;font-weight:600}
.pill.g{background:#E5F3EC;color:var(--green)}
.pill.y{background:var(--soft);color:var(--yellow-deep)}
.pill.c{background:#FBE9E5;color:var(--coral-deep)}
.aform{background:#fff;border:1px solid var(--line);border-radius:13px;padding:22px;margin-bottom:20px;max-width:640px}
.aform .row{margin-bottom:14px}
.aform label{display:block;font-size:12.5px;font-weight:600;color:var(--ink2);margin-bottom:6px}
.aform input,.aform textarea,.aform select{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:9px 13px;font-size:13.5px;font-family:inherit;background:#FDFCFA;color:var(--ink)}
.aform input:focus,.aform textarea:focus,.aform select:focus{outline:none;border-color:var(--yellow)}
.aform textarea{min-height:90px;resize:vertical}
.aform .chk{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink2)}
.aform .chk input{width:auto}
.a-actions{display:flex;gap:8px;flex-wrap:wrap}
.a-actions a{color:var(--blue);font-size:12.5px;cursor:pointer}
.a-actions a.del{color:var(--coral-deep)}
.flash{border-radius:12px;padding:12px 16px;font-size:13.5px;margin-bottom:18px}
.flash.ok{background:#E5F3EC;color:var(--green)}
.flash.err{background:#FBE9E5;color:var(--coral-deep)}
/* 登录页 */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,var(--soft),var(--bg) 60%)}
.login-card{background:#fff;border:1.5px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:44px 40px;width:400px;max-width:92vw}
.login-card .logo{justify-content:center;margin-bottom:8px}
.login-card .sub{text-align:center;font-size:13px;color:var(--muted);margin-bottom:26px}
.login-card input{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:11px 15px;font-size:14.5px;margin-bottom:14px;background:var(--bg)}
.login-card input:focus{outline:none;border-color:var(--yellow)}
.login-card .btn{width:100%;justify-content:center}

/* ===== 响应式 ===== */
.to-top{position:fixed;right:28px;bottom:28px;width:46px;height:46px;border-radius:50%;background:var(--panel);border:1.5px solid var(--line);color:var(--ink2);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .25s,transform .25s,visibility .25s,border-color .2s,color .2s;box-shadow:var(--shadow-lg);z-index:99}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--yellow);color:var(--yellow-deep)}
@media (max-width:720px){
  .to-top{right:16px;bottom:16px;width:42px;height:42px}
}
@media (max-width:960px){
  .hero{grid-template-columns:1fr;gap:48px;padding-top:56px;text-align:center}
  .hero-brand{justify-content:center}
  .hero p.sub{margin-inline:auto}
  .hero .dl,.hero .meta{justify-content:center}
  .grid,.dlgrid{grid-template-columns:repeat(2,1fr)}
  .e2ee{grid-template-columns:1fr;padding:44px 32px}
  .nav-links{display:none;position:absolute;top:70px;left:0;right:0;background:var(--panel);border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:10px 28px 16px}
  .nav-links.open{display:flex}
  .nav-links a{padding:10px 0}
  .menu-btn{display:block}
  .stats{grid-template-columns:repeat(2,1fr)}
  .alayout{grid-template-columns:1fr}
  .side{position:static;height:auto;display:flex;flex-wrap:wrap;gap:4px;padding:14px}
  .side .brand{width:100%;margin-bottom:10px}
  .side a{margin-bottom:0}
  .side .out{margin-top:0;border:0;padding:0;width:100%}
  .amain{padding:20px 18px}
}
@media (max-width:600px){
  .hero h1{font-size:36px}
  section{padding:60px 0}
  .grid,.dlgrid{grid-template-columns:1fr}
  .wrap{padding:0 18px}
  .nav-cta .btn-ghost{display:none}
  .notice{flex-direction:column;gap:4px}
}