/* ========= Reset & Base ========= */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC",sans-serif;
    background:#f0f2f5;color:#333;line-height:1.6;min-height:100vh
}

/* ========= Header ========= */
.header{
    background:#fff;padding:16px 24px;display:flex;align-items:center;
    justify-content:space-between;box-shadow:0 1px 3px rgba(0,0,0,.08);
    position:sticky;top:0;z-index:100
}
.header h1{font-size:20px;font-weight:600;color:#1a1a1a}
.header-actions{display:flex;gap:12px}
.admin-link{color:#1677ff;text-decoration:none;font-size:14px;padding:6px 14px;border-radius:6px;transition:background .2s}
.admin-link:hover{background:#e6f4ff}

/* ========= Container ========= */
.container{max-width:960px;margin:0 auto;padding:24px 16px 48px}

/* ========= Nav Grid ========= */
.nav-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.nav-card{
    display:flex;flex-direction:column;gap:6px;background:#fff;padding:20px;
    border-radius:10px;text-decoration:none;color:inherit;
    box-shadow:0 1px 3px rgba(0,0,0,.06);transition:transform .15s,box-shadow .2s
}
.nav-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.1)}
.nav-title{font-size:16px;font-weight:600;color:#1677ff}
.nav-desc{font-size:13px;color:#666}

/* ========= Card ========= */
.card{background:#fff;border-radius:10px;padding:24px;margin-bottom:20px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.card h2{font-size:16px;margin-bottom:16px;color:#1a1a1a}

/* ========= Form ========= */
.form{display:flex;flex-direction:column;gap:12px}
.form-row{display:flex;gap:12px;flex-wrap:wrap}
.form-row input{
    flex:1;min-width:180px;padding:8px 12px;border:1px solid #d9d9d9;
    border-radius:6px;font-size:14px;outline:none;transition:border .2s
}
.form-row input:focus{border-color:#1677ff;box-shadow:0 0 0 2px rgba(22,119,255,.15)}
.form-actions{display:flex;gap:8px}
.edit-form{margin-top:12px}
.btn{
    padding:8px 20px;border:none;border-radius:6px;font-size:14px;
    cursor:pointer;background:#1677ff;color:#fff;transition:background .2s;white-space:nowrap
}
.btn:hover{background:#4096ff}
.btn-danger{background:#ff4d4f}
.btn-danger:hover{background:#ff7875}

/* ========= Flash ========= */
.flash{padding:10px 16px;border-radius:6px;margin-bottom:16px;font-size:14px}
.flash.success{background:#f6ffed;border:1px solid #b7eb8f;color:#389e0d}
.flash.error{background:#fff2f0;border:1px solid #ffccc7;color:#cf1322}

/* ========= Link List ========= */
.link-list{display:flex;flex-direction:column;gap:0}
.link-item{border-bottom:1px solid #f0f0f0}
.link-item:last-child{border-bottom:none}
details{padding:4px 0}
.link-summary{cursor:pointer;padding:12px 0;display:flex;align-items:center;justify-content:space-between;gap:12px;list-style:none}
.link-summary::-webkit-details-marker{display:none}
.link-title{font-weight:500;font-size:14px}
.link-url{font-size:12px;color:#999;max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ========= Empty ========= */
.empty{text-align:center;color:#999;padding:32px 0;font-size:14px}
.empty a{color:#1677ff}

/* ========= Login ========= */
.login-page{display:flex;align-items:center;justify-content:center}
.login-container{width:100%;max-width:380px;padding:16px}
.login-form{background:#fff;padding:32px 24px;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,.08);display:flex;flex-direction:column;gap:16px}
.login-form h1{font-size:20px;font-weight:600;text-align:center;margin-bottom:4px}
.login-form input{padding:10px 14px;border:1px solid #d9d9d9;border-radius:6px;font-size:15px;outline:none;transition:border .2s}
.login-form input:focus{border-color:#1677ff;box-shadow:0 0 0 2px rgba(22,119,255,.15)}
.login-form .btn{padding:10px;font-size:15px}

/* ========= Responsive ========= */
@media(max-width:600px){
    .nav-grid{grid-template-columns:1fr}
    .form-row{flex-direction:column}
    .form-row input{min-width:0}
    .header{flex-wrap:wrap;gap:8px}
    .link-url{max-width:160px}
}