:root{
  --bg:#f4f6f9;
  --card:#ffffff;
  --text:#162133;
  --muted:#7a8398;
  --line:#e6ebf2;
  --primary:#1fb89b;
  --primary-dark:#13a287;
  --primary-soft:#eafaf6;
  --danger:#e25b67;
  --danger-soft:#fff2f3;
  --warning:#f0a128;
  --warning-soft:#fff8ea;
  --success:#19a66f;
  --success-soft:#eaf9f1;
  --shadow:0 10px 35px rgba(22,33,51,.06);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--primary-dark);text-decoration:none}
a:hover{opacity:.9}

/* app shell */
.app-body{min-height:100vh;background:var(--bg)}
.app-shell{display:flex;min-height:100vh}
.sidebar{width:256px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:18px 18px 22px;position:sticky;top:0;height:100vh}
.sidebar-brand{display:flex;align-items:center;gap:12px;padding:10px 10px 16px;margin-bottom:8px;border-bottom:1px solid var(--line);color:var(--text)}
.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#5cd5bf);position:relative;box-shadow:0 6px 18px rgba(31,184,155,.25)}
.brand-mark:before{content:"";position:absolute;left:8px;top:7px;width:12px;height:12px;border:2px solid #fff;border-left:0;border-bottom:0;transform:rotate(45deg)}
.brand-copy{display:flex;flex-direction:column;line-height:1.1}
.brand-copy strong{font-size:22px;font-weight:800;letter-spacing:.1px}
.brand-copy small{font-size:12px;color:var(--primary-dark);margin-top:4px}
.side-nav{display:flex;flex-direction:column;gap:6px;padding-top:8px}
.nav-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;color:#3d465d;font-weight:650;transition:.18s background,.18s color,.18s transform}
.nav-item:hover{background:#f7f9fc;transform:translateX(2px)}
.nav-item.active{background:var(--primary-soft);color:var(--primary-dark)}
.nav-icon{width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;background:#f3f6fa;color:#52607a;font-size:12px;flex:0 0 20px}
.nav-item.active .nav-icon{background:#d8f4ed;color:var(--primary-dark)}
.sidebar-foot{margin-top:auto;padding-top:16px;border-top:1px solid var(--line)}
.sidebar-foot-title{font-size:12px;color:var(--muted);margin-bottom:10px}
.sidebar-mini-actions{display:flex;gap:10px}
.mini-action{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;background:#fff;color:#41506b;font-weight:700}
.mini-action:hover{background:#f7fafc}
.app-main{flex:1;min-width:0;display:flex;flex-direction:column}
.content-topbar{height:74px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:10}
.page-title{font-size:28px;font-weight:850;line-height:1.1}
.page-subtitle{color:var(--muted);font-size:13px;margin-top:4px}
.topbar-tools{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.lang-switch{font-size:14px;font-weight:700;color:var(--primary-dark)}
.topbar-avatar{width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#32c2aa,#1d8fff);color:#fff;font-weight:800}
.topbar-username{font-weight:700;color:#3b465b}
.container{padding:24px 28px 30px;min-height:calc(100vh - 74px - 55px)}
.footer{text-align:center;color:var(--muted);padding:16px 28px 24px}

/* generic cards and typography */
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow);margin-bottom:20px}
.card h1,.card h2,.card h3{margin:0 0 10px}
.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.stat strong{display:block;font-size:42px;font-weight:850;margin:10px 0 8px;line-height:1}
.stat small{font-size:13px}
.muted{color:var(--muted)}
.section-title{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:18px}
.section-title h1,.section-title h2{margin:0}
.section-title p{margin:.35rem 0 0}
.right{text-align:right}.inline{display:inline}

/* forms */
.form-grid{display:grid;gap:16px}
.form-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.span-2{grid-column:span 2}
label{font-size:14px;font-weight:700;display:flex;flex-direction:column;gap:8px;color:#324055}
input,select,textarea{width:100%;border:1px solid #d7deea;border-radius:12px;padding:12px 14px;background:#fff;color:var(--text);font:inherit;outline:none;transition:border-color .15s, box-shadow .15s}
input:focus,select:focus,textarea:focus{border-color:#86dbc8;box-shadow:0 0 0 4px rgba(31,184,155,.10)}
textarea{min-height:110px;resize:vertical}
.checkbox{display:flex;flex-direction:row;align-items:center;gap:8px}.checkbox input{width:auto}
.btn{border:0;border-radius:12px;padding:11px 16px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:transform .15s, opacity .15s}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.btn.secondary{background:#f3f7fb;color:#3a4a65;border:1px solid var(--line)}
.btn.danger{background:var(--danger-soft);color:var(--danger)}
.btn.success{background:var(--primary-soft);color:var(--primary-dark)}
.btn.small{padding:8px 11px;font-size:13px;border-radius:10px}
.actions{display:flex;gap:8px;flex-wrap:wrap}

/* tables */
.table-wrap{overflow:auto;border-radius:16px;border:1px solid var(--line);background:#fff}
.table{width:100%;border-collapse:collapse;min-width:760px}
.table th,.table td{text-align:left;border-bottom:1px solid var(--line);padding:14px 12px;font-size:14px;vertical-align:top}
.table th{background:#f8fafc;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.03em}
.table tr:last-child td{border-bottom:0}

/* alerts / badges */
.alert{padding:14px 16px;border-radius:14px;margin-bottom:16px;border:1px solid transparent}
.alert.success{background:var(--success-soft);border-color:#cbeedb;color:var(--success)}
.alert.error{background:var(--danger-soft);border-color:#ffd9dd;color:var(--danger)}
.alert.warning{background:var(--warning-soft);border-color:#ffe0aa;color:#a76a00}
.badge{display:inline-block;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:800;background:#edf1f7;color:#576378}
.badge.success{background:var(--success-soft);color:var(--success)}
.badge.danger{background:var(--danger-soft);color:var(--danger)}
.badge.warning{background:var(--warning-soft);color:#a76a00}
.danger-text{color:var(--danger)}

/* auth pages */
.auth-body{min-height:100vh;background:var(--bg)}
.auth-shell{display:flex;min-height:100vh}
.public-sidebar{width:240px;background:#fff;border-right:1px solid var(--line);padding:18px;display:flex;flex-direction:column}
.public-nav{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.public-nav a{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;color:#3c465b;font-weight:650}
.public-nav a.active,.public-nav a:hover{background:var(--primary-soft);color:var(--primary-dark)}
.public-main{flex:1;display:flex;flex-direction:column;min-width:0}
.public-topbar{height:74px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:flex-end;padding:0 28px;gap:12px}
.outline-link{padding:9px 14px;border:1px solid #d6deea;border-radius:11px;background:#fff;color:#41506b;font-weight:700}
.public-content{flex:1;display:flex;align-items:center;justify-content:center;padding:30px}
.auth-panel{width:min(100%,520px);background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:28px}
.auth-panel h1{font-size:42px;margin:0 0 8px;line-height:1.1}
.auth-panel p{margin:0 0 18px}
.auth-panel .btn{width:100%}
.auth-links{margin-top:16px;color:var(--muted)}
.auth-note{font-size:14px}

/* misc */
.plan{position:relative}.plan .price{font-size:36px;font-weight:850;margin:12px 0}.plan.featured{border:2px solid #b6eee2;background:linear-gradient(180deg,#fbfffe,#ffffff)}
.mail-item{padding:10px 0;border-bottom:1px dashed var(--line)}
.mail-item:last-child{border-bottom:0}.mail-item.unread a{font-weight:800}
.mail-preview{color:var(--muted);font-weight:400;max-width:500px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.message-body{white-space:pre-wrap;line-height:1.75}
.code-box{background:#0f172a;color:#d8e4ff;padding:14px;border-radius:12px;word-break:break-all}
.pagination{display:flex;gap:8px;margin-top:18px;flex-wrap:wrap}.pagination a,.pagination span{padding:8px 11px;background:#fff;border:1px solid var(--line);border-radius:10px}.pagination .active{background:var(--primary);color:#fff;border-color:var(--primary)}
.tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}.tabs a{padding:9px 12px;border-radius:10px;background:#f2f6fb;color:#44536d;border:1px solid var(--line)}

@media (max-width: 1100px){
  .grid.cols-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width: 900px){
  .app-shell,.auth-shell{display:block}
  .sidebar,.public-sidebar{position:relative;width:100%;height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .content-topbar,.public-topbar{height:auto;padding:16px 18px;align-items:flex-start;gap:12px;flex-direction:column}
  .container{padding:18px}
  .public-content{padding:18px}
  .grid.cols-2,.grid.cols-3,.grid.cols-4,.form-grid.two{grid-template-columns:1fr}
  .span-2{grid-column:span 1}
  .section-title{flex-direction:column;align-items:flex-start}
}