*{margin:0;padding:0;box-sizing:border-box}
:root{
    --pri:#3b82f6;
    --pri-dark:#2563eb;
    --pri-deep:#1e50c4;
    --pri-soft:#e8efff;
    --bg:#f5f7fb;
    --card:#fff;
    --line:#e8ecf3;
    --line-soft:#eef1f7;
    --text:#1f2430;
    --text-2:#39415a;
    --text-3:#6b7689;
    --text-4:#98a2b8;
    --ok:#0f8a4d;
    --ok-bg:#e7f8ef;
    --err:#c53030;
    --err-bg:#fdecec;
    --radius:16px;
    --radius-sm:10px;
    --shadow-sm:0 2px 8px rgba(31,36,48,.04);
    --shadow:0 4px 18px rgba(31,36,48,.06);
    --shadow-lg:0 14px 36px rgba(31,36,48,.12);
}
html{-webkit-text-size-adjust:100%}
body{
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.65;
    padding-top:60px;
    font-size:15px;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
}
a{text-decoration:none;color:inherit;-webkit-tap-highlight-color:transparent}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:14px}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}

.hero{
    background:linear-gradient(155deg,#4f8dfb 0%,#6d5ef5 55%,#8b5cf6 100%);
    padding:70px 0 90px;
    text-align:center;color:#fff;
    position:relative;overflow:hidden;
    margin-top:-60px;padding-top:120px;
}
.hero::before{
    content:"";position:absolute;inset:0;
    background:radial-gradient(circle at 20% 10%,rgba(255,255,255,.18),transparent 45%),
               radial-gradient(circle at 85% 80%,rgba(255,255,255,.12),transparent 40%);
    pointer-events:none;
}
.hero .wrap{position:relative;z-index:2}
.logo-big{
    width:92px;height:92px;border-radius:24px;
    margin:0 auto 22px;
    box-shadow:0 20px 44px rgba(30,41,89,.35),0 0 0 6px rgba(255,255,255,.08);
}
.hero h1{font-size:44px;letter-spacing:6px;margin-bottom:12px;font-weight:800}
.slogan{font-size:16px;opacity:.94;margin-bottom:20px;letter-spacing:.5px}
.ver-badge{
    display:inline-block;
    background:rgba(255,255,255,.22);
    border:1px solid rgba(255,255,255,.4);
    padding:6px 18px;border-radius:22px;
    font-size:13px;margin-bottom:28px;
    backdrop-filter:blur(6px);
}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

.btn{
    display:inline-block;
    padding:11px 24px;
    border-radius:10px;
    font-size:14px;font-weight:500;
    line-height:1.4;text-align:center;
    transition:all .22s ease;
    cursor:pointer;
    border:none;
    white-space:nowrap;
}
.btn-pri{background:var(--pri);color:#fff;box-shadow:0 4px 12px rgba(59,130,246,.28)}
.btn-pri:hover{background:var(--pri-dark);box-shadow:0 6px 18px rgba(37,99,235,.36);transform:translateY(-1px)}
.btn-pri:active{background:var(--pri-deep);transform:translateY(0)}
.btn-ghost{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.55);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.28)}
.btn-lg{padding:14px 36px;font-size:15px;border-radius:12px}
.btn-sm{padding:6px 14px;font-size:13px;border-radius:8px}
.btn-gray{background:#eef1f8;color:var(--text-2)}
.btn-gray:hover{background:#e2e7f2}
.btn-block{display:block;width:100%}

.section{padding:64px 0}
.sec-title{text-align:center;font-size:30px;font-weight:700;margin-bottom:8px;letter-spacing:.5px}
.sec-sub{text-align:center;color:var(--text-3);margin-bottom:44px;font-size:14px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:20px}
.card{
    background:var(--card);
    border-radius:var(--radius);
    padding:28px 24px;
    box-shadow:var(--shadow-sm);
    border:1px solid var(--line-soft);
    transition:all .28s ease;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.card-ico{
    width:48px;height:48px;border-radius:13px;
    background:linear-gradient(135deg,var(--pri-soft),#f0e9ff);
    color:var(--pri);
    display:flex;align-items:center;justify-content:center;
    margin-bottom:16px;
}
.card-ico svg{width:24px;height:24px}
.card h3{font-size:17px;font-weight:600;margin-bottom:10px;color:var(--text)}
.card p{font-size:14px;color:var(--text-3);line-height:1.7}

.cta{
    background:linear-gradient(135deg,#1e293b 0%,#334155 60%,#475569 100%);
    border-radius:22px;padding:56px 30px;
    text-align:center;color:#fff;
    position:relative;overflow:hidden;
}
.cta::before{
    content:"";position:absolute;top:-50%;right:-20%;
    width:400px;height:400px;
    background:radial-gradient(circle,rgba(59,130,246,.25),transparent 70%);
    pointer-events:none;
}
.cta h2{font-size:28px;font-weight:700;margin-bottom:10px;position:relative}
.cta p{opacity:.78;margin-bottom:28px;font-size:15px;position:relative}
.cta .btn{position:relative}

.page-head{background:var(--card);padding:44px 0 34px}
.page-head h1{font-size:28px;font-weight:700;margin-bottom:6px}
.page-head p{color:var(--text-3);font-size:14px}

.form-card{
    background:var(--card);
    border-radius:var(--radius);
    padding:34px 28px;
    box-shadow:var(--shadow);
    max-width:680px;margin:0 auto;
    border:1px solid var(--line-soft);
}
.field{margin-bottom:22px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px;color:var(--text-2)}
.field label .req{color:#ef4444;margin-left:2px}
.field input[type=text],
.field input[type=password],
.field input[type=number],
.field select,
.field textarea{
    width:100%;padding:12px 14px;
    border:1.5px solid #e2e7f2;border-radius:var(--radius-sm);
    font-size:14px;background:#fafbfe;
    transition:all .2s ease;outline:none;
    -webkit-appearance:none;appearance:none;
    color:var(--text);
}
.field select{
    background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2398a2b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
    background-repeat:no-repeat;
    background-position:right 14px center;
    padding-right:38px;
}
.field input:hover,.field select:hover,.field textarea:hover{border-color:#d4dcec}
.field input:focus,.field select:focus,.field textarea:focus{
    border-color:var(--pri);background:#fff;
    box-shadow:0 0 0 3px rgba(59,130,246,.13);
}
.field textarea{resize:vertical;min-height:120px;line-height:1.6}
.field input[type=file]{
    width:100%;padding:11px 14px;
    border:1.5px dashed #cdd6e6;border-radius:var(--radius-sm);
    font-size:13px;background:#fafbfe;cursor:pointer;
    transition:all .2s ease;
}
.field input[type=file]:hover{border-color:var(--pri);background:#f5f9ff}
.hint{font-size:12px;color:var(--text-4);margin-top:6px;line-height:1.5}
.form-actions{display:flex;gap:12px;align-items:center;margin-top:28px;flex-wrap:wrap}
.form-actions .btn-pri{min-width:140px}

.alert{
    padding:14px 18px;border-radius:12px;
    font-size:14px;margin-bottom:22px;
    max-width:680px;margin-left:auto;margin-right:auto;
    display:flex;align-items:center;gap:10px;
    line-height:1.5;
}
.alert-ok{background:var(--ok-bg);color:var(--ok);border:1px solid #b7e8cd}
.alert-err{background:var(--err-bg);color:var(--err);border:1px solid #f8c5c5}

.qq-input-wrap{display:flex;align-items:center;gap:10px}
.qq-input-wrap input{flex:1;min-width:0}
.qq-avatar{width:40px;height:40px;min-width:40px;max-width:40px;border-radius:50%;border:2px solid #e2e7f2;object-fit:cover;flex-shrink:0;background:#f4f6fb;display:block}

.logs{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.log-item{
    background:var(--card);
    border-radius:var(--radius);
    padding:26px 26px;
    box-shadow:var(--shadow-sm);
    border:1px solid var(--line-soft);
    transition:all .25s ease;
}
.log-item:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.log-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.log-ver{font-size:18px;font-weight:700;color:var(--pri);letter-spacing:.3px}
.log-time{font-size:12px;color:var(--text-4);margin-left:auto;font-variant-numeric:tabular-nums}
.log-body{font-size:14px;color:#4a5468;white-space:pre-wrap;word-break:break-word;line-height:1.75}

.admin-nav{
    background:rgba(255,255,255,.95);
    position:sticky;top:60px;z-index:40;
    backdrop-filter:blur(10px);
}
.admin-nav-in{
    max-width:1100px;margin:0 auto;padding:0 20px;
    display:flex;gap:2px;overflow-x:auto;
    scrollbar-width:none;
}
.admin-nav-in::-webkit-scrollbar{display:none}
.admin-nav a{
    padding:16px 16px;
    font-size:14px;color:var(--text-3);
    white-space:nowrap;flex-shrink:0;
    transition:color .2s ease;
    border-radius:8px;
}
.admin-nav a:hover{color:var(--text);background:#f2f6ff}
.admin-nav a.on{color:var(--pri);font-weight:600;background:var(--pri-soft)}

.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}
.stat-card{
    background:var(--card);
    border-radius:var(--radius);
    padding:22px 20px;
    text-align:center;
    box-shadow:var(--shadow-sm);
    border:1px solid var(--line-soft);
    transition:all .25s ease;
}
.stat-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.stat-num{font-size:32px;font-weight:800;line-height:1.2;color:var(--pri);font-variant-numeric:tabular-nums}
.stat-label{font-size:13px;color:var(--text-3);margin-top:4px}
.stat-card.stat-total .stat-num{color:#6d5ef5}
.stat-card.stat-unread .stat-num{color:#ef4444}
.stat-card.stat-unread{background:linear-gradient(180deg,#fff7f7 0%,#fff 60%);border-color:#fde0e0}
.stat-card.stat-read .stat-num{color:var(--ok)}
.stat-card.stat-read{background:linear-gradient(180deg,#f4fbf7 0%,#fff 60%);border-color:#d5ebdf}

.tab-nav{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.tab-nav a{
    padding:10px 20px;
    border-radius:10px;
    font-size:14px;font-weight:500;
    color:var(--text-3);
    background:#fff;
    border:1px solid var(--line-soft);
    transition:all .2s ease;
}
.tab-nav a:hover{color:var(--text);border-color:#d4dcec}
.tab-nav a.on{color:#fff;background:var(--pri);border-color:var(--pri);box-shadow:0 4px 12px rgba(59,130,246,.28)}

.table-wrap{
    background:var(--card);
    border-radius:var(--radius);
    overflow:hidden;
    box-shadow:var(--shadow-sm);
    border:1px solid var(--line-soft);
    overflow-x:auto;
}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:640px}
th{background:#f7f9fd;text-align:left;padding:14px 18px;font-size:13px;color:var(--text-3);font-weight:600;white-space:nowrap}
td{padding:15px 18px;color:var(--text-2);vertical-align:middle}
tr:hover td{background:#fafbfe}

.badge{display:inline-block;padding:3px 11px;border-radius:20px;font-size:12px;font-weight:500;white-space:nowrap;line-height:1.6}
.badge-blue{background:var(--pri-soft);color:var(--pri)}
.badge-green{background:var(--ok-bg);color:var(--ok)}
.badge-orange{background:#fff3e3;color:#c77700}
.badge-red{background:#fdecec;color:#c53030}

.detail-grid{display:grid;grid-template-columns:1fr;gap:18px;max-width:820px;margin:0 auto}
.detail-card{background:var(--card);border-radius:var(--radius);padding:26px 26px;box-shadow:var(--shadow-sm);border:1px solid var(--line-soft)}
.detail-card h3{font-size:16px;font-weight:600;margin-bottom:18px;color:var(--text)}
.detail-row{display:flex;padding:12px 0;font-size:14px;flex-wrap:wrap;gap:6px}
.detail-label{width:100px;color:var(--text-4);flex-shrink:0}
.detail-val{color:var(--text-2);flex:1;word-break:break-word;min-width:0}
.detail-val img{max-width:100%;border-radius:10px;margin-top:6px;border:1px solid var(--line-soft)}

.reply-item{background:#f7f9fd;border-radius:12px;padding:14px 16px;margin-bottom:12px;font-size:14px;color:var(--text-2);line-height:1.7}
.reply-time{font-size:12px;color:var(--text-4);margin-top:8px}

.empty{text-align:center;padding:60px 20px;color:var(--text-4);font-size:14px;background:var(--card);border-radius:var(--radius);border:1px dashed var(--line)}

footer,.footer{background:#1e2433;color:#9aa5bd;padding:40px 0;text-align:center;font-size:14px;margin-top:50px}
.foot-logo{width:44px;height:44px;border-radius:12px;margin:0 auto 14px;opacity:.95}
.foot-sub{font-size:12px;opacity:.5;margin-top:8px}

@media(max-width:640px){
    body{padding-top:56px;font-size:14px}
    .hero{padding-top:105px;margin-top:-56px;padding-bottom:70px}
    .hero h1{font-size:32px;letter-spacing:4px}
    .logo-big{width:74px;height:74px;border-radius:18px;margin-bottom:16px}
    .slogan{font-size:14px}
    .ver-badge{font-size:12px;padding:5px 14px;margin-bottom:22px}
    .hero-btns{gap:10px}
    .btn-lg{padding:12px 26px;font-size:14px}

    .section{padding:44px 0}
    .sec-title{font-size:22px}
    .sec-sub{margin-bottom:30px;font-size:13px}

    .grid{grid-template-columns:1fr;gap:14px}
    .card{padding:22px 18px}

    .cta{padding:38px 20px;border-radius:18px}
    .cta h2{font-size:20px}
    .cta p{font-size:13px;margin-bottom:22px}

    .page-head{padding:34px 0 26px}
    .page-head h1{font-size:22px}
    .page-head p{font-size:13px}

    .form-card{padding:22px 16px;border-radius:14px}
    .field{margin-bottom:18px}
    .form-actions{flex-direction:column;margin-top:22px}
    .form-actions .btn{width:100%;min-width:0}

    .log-item{padding:20px 18px}
    .log-ver{font-size:16px}
    .log-time{width:100%;margin-left:0;font-size:12px;margin-top:2px}
    .log-body{font-size:13px}

    .admin-nav{top:56px}
    .admin-nav a{padding:12px 12px;font-size:13px}

    .stat-grid{grid-template-columns:1fr;gap:12px}
    .stat-card{padding:18px 16px}
    .stat-num{font-size:26px}

    .tab-nav a{padding:8px 14px;font-size:13px}

    .table-wrap{border-radius:14px}
    th,td{padding:12px 14px;font-size:13px}

    .detail-card{padding:20px 16px}
    .detail-label{width:80px;font-size:13px}
    .detail-val{font-size:13px}

    .empty{padding:44px 16px;font-size:13px}

    footer,.footer{padding:32px 0;margin-top:36px}
    .foot-logo{width:38px;height:38px}
}