/* ===== Design System ===== */
:root {
    --bg: #0f1117;
    --bg2: #161822;
    --surface: #1c1f2e;
    --surface2: #232738;
    --border: rgba(255,255,255,.06);
    --border2: rgba(255,255,255,.1);
    --txt: #e4e6ef;
    --txt2: #8b8fa3;
    --txt3: #565a6e;
    --accent: #6366f1;
    --accent2: #818cf8;
    --accent-g: linear-gradient(135deg,#6366f1,#8b5cf6);
    --ok: #34d399;
    --ok-bg: rgba(52,211,153,.1);
    --warn: #fbbf24;
    --warn-bg: rgba(251,191,36,.1);
    --err: #f87171;
    --err-bg: rgba(248,113,113,.1);
    --blue: #60a5fa;
    --blue-bg: rgba(96,165,250,.1);
    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,.3);
    --shadow-sm: 0 2px 8px rgba(0,0,0,.2);
    --transition: .25s cubic-bezier(.4,0,.2,1);
}

/* ===== Reset ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--txt);line-height:1.65;font-size:14px;-webkit-font-smoothing:antialiased}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--txt3);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--txt2)}

/* ===== Nav ===== */
.navbar{background:rgba(22,24,34,.85);backdrop-filter:blur(20px) saturate(1.5);-webkit-backdrop-filter:blur(20px) saturate(1.5);border-bottom:1px solid var(--border);padding:0 2rem;display:flex;align-items:center;height:60px;position:sticky;top:0;z-index:100}
.navbar .brand{font-size:1.05rem;font-weight:700;margin-right:2.5rem;white-space:nowrap;background:var(--accent-g);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.02em}
.navbar .links{display:flex;gap:.25rem}
.navbar .links a{color:var(--txt2);text-decoration:none;padding:.5rem 1rem;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;transition:var(--transition);position:relative}
.navbar .links a:hover{color:var(--txt);background:rgba(255,255,255,.04)}
.navbar .links a.on{color:#fff;background:rgba(99,102,241,.15)}
.navbar .links a.on::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:16px;height:2px;background:var(--accent);border-radius:1px}

/* ===== Layout ===== */
.container{max-width:1320px;margin:0 auto;padding:1.75rem 2rem}
.page-title{font-size:1.5rem;font-weight:700;letter-spacing:-.03em;margin-bottom:.35rem}
.page-sub{color:var(--txt2);font-size:.875rem;margin-bottom:1.75rem}

/* ===== Cards ===== */
.card{background:var(--surface);border-radius:var(--radius);padding:1.5rem;border:1px solid var(--border);margin-bottom:1.25rem;transition:var(--transition)}
.card:hover{border-color:var(--border2);box-shadow:var(--shadow-sm)}
.card h2,.card h3{color:var(--txt);font-size:.95rem;font-weight:600;margin-bottom:1rem;letter-spacing:-.01em}
.card h3{display:flex;align-items:center;gap:.5rem}

/* ===== Stats Grid ===== */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.75rem}
.stat{background:var(--surface);border-radius:var(--radius);padding:1.25rem 1.5rem;border:1px solid var(--border);position:relative;overflow:hidden;transition:var(--transition)}
.stat:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 32px rgba(99,102,241,.1)}
.stat::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--accent-g);opacity:0;transition:var(--transition)}
.stat:hover::before{opacity:1}
.stat .lb{font-size:.75rem;color:var(--txt2);text-transform:uppercase;letter-spacing:.05em;font-weight:500;margin-bottom:.4rem}
.stat .vl{font-size:1.75rem;font-weight:700;color:#fff;letter-spacing:-.03em}
.stat .sub{font-size:.75rem;color:var(--txt3);margin-top:.25rem}

/* ===== Tables ===== */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:.8125rem}
thead{position:sticky;top:0;z-index:10}
th{background:var(--surface2);color:var(--txt2);font-weight:600;padding:.75rem 1rem;text-align:center;cursor:pointer;user-select:none;border-bottom:1px solid var(--border);font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;transition:var(--transition)}
th:hover{color:var(--accent2);background:rgba(99,102,241,.06)}
th .arr{font-size:.65rem;margin-left:.3rem;opacity:.5}
td{padding:.7rem 1rem;text-align:center;border-bottom:1px solid var(--border);color:var(--txt);transition:var(--transition)}
tr:hover td{background:rgba(99,102,241,.03)}
tr.hl td{background:rgba(52,211,153,.05);color:var(--ok);font-weight:600}
tr.wr td{background:rgba(248,113,113,.05);color:var(--err)}

/* ===== Pills ===== */
.pill{display:inline-block;padding:.2rem .6rem;border-radius:20px;font-size:.6875rem;font-weight:600;letter-spacing:.01em}
.pg{background:var(--ok-bg);color:var(--ok)}
.py{background:var(--warn-bg);color:var(--warn)}
.pr{background:var(--err-bg);color:var(--err)}
.pb{background:var(--blue-bg);color:var(--blue)}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.65rem 1.5rem;border:none;border-radius:var(--radius-sm);font-size:.875rem;font-weight:600;cursor:pointer;transition:var(--transition);letter-spacing:-.01em}
.btn-p{background:var(--accent-g);color:#fff;box-shadow:0 4px 16px rgba(99,102,241,.25)}
.btn-p:hover{transform:translateY(-1px);box-shadow:0 6px 24px rgba(99,102,241,.35)}
.btn-p:active{transform:translateY(0)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important;box-shadow:none!important}

/* ===== Forms ===== */
select,select[multiple]{background:var(--surface2);color:var(--txt);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.5rem .75rem;font-size:.8125rem;font-family:inherit;transition:var(--transition);outline:none;width:100%}
select:focus,select[multiple]:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(99,102,241,.15)}
select[multiple]{height:120px}
.fg{margin-bottom:1.25rem}
.fg label{display:block;font-weight:600;margin-bottom:.4rem;font-size:.8125rem;color:var(--txt)}
.fg .rd{display:flex;justify-content:space-between;font-size:.75rem;color:var(--txt3);margin-top:.35rem}
.fg .rd strong{color:var(--accent2);font-size:.875rem}

/* Range Slider */
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;background:var(--surface2);border-radius:3px;outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--accent);box-shadow:0 2px 8px rgba(99,102,241,.4);cursor:pointer;transition:var(--transition)}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15);box-shadow:0 2px 12px rgba(99,102,241,.6)}
input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--accent);box-shadow:0 2px 8px rgba(99,102,241,.4);cursor:pointer;border:none}

/* ===== Grids ===== */
.g2{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.g3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1.25rem}
.cht{position:relative;width:100%;max-width:480px;margin:0 auto}

/* ===== Tags ===== */
.tag{display:inline-block;background:rgba(99,102,241,.15);color:var(--accent2);padding:.15rem .5rem;border-radius:4px;font-size:.6875rem;font-weight:600;margin-left:.4rem}

/* ===== Loading ===== */
.ld{text-align:center;padding:2.5rem;color:var(--txt3)}
.ld::before{content:'';display:inline-block;width:24px;height:24px;border:2px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:.75rem}
.ld::after{content:'加载中';display:block;font-size:.8125rem;margin-top:.5rem}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Skeleton ===== */
.skeleton{background:linear-gradient(90deg,var(--surface2) 25%,var(--surface) 50%,var(--surface2) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ===== Portfolio Tabs ===== */
.pf-tabs{display:flex;gap:.25rem;background:var(--bg);border-radius:var(--radius-sm);padding:3px;margin-bottom:1rem;width:fit-content}
.pf-tab{background:transparent;color:var(--txt2);border:none;padding:.45rem 1.1rem;border-radius:6px;font-size:.8125rem;font-weight:600;cursor:pointer;transition:var(--transition)}
.pf-tab:hover{color:var(--txt)}
.pf-tab.on{background:var(--accent);color:#fff;box-shadow:0 2px 8px rgba(99,102,241,.3)}
.pf-panel{animation:fadeIn .25s ease-out}

/* ===== Footer ===== */
footer{text-align:center;padding:2rem;color:var(--txt3);font-size:.75rem;border-top:1px solid var(--border);margin-top:2rem}

/* ===== Animations ===== */
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeIn .4s ease-out}
.card{animation:fadeIn .35s ease-out}

/* ===== Responsive ===== */
@media(max-width:768px){
    .navbar{padding:0 1rem;height:auto;flex-wrap:wrap;gap:.5rem;padding-top:.75rem;padding-bottom:.75rem}
    .navbar .brand{margin-right:1rem}
    .navbar .links{gap:.15rem}
    .navbar .links a{padding:.4rem .7rem;font-size:.8125rem}
    .container{padding:1rem}
    .g2,.g3{grid-template-columns:1fr}
    .stats{grid-template-columns:1fr 1fr}
    .page-title{font-size:1.25rem}
}
@media(max-width:480px){
    .stats{grid-template-columns:1fr}
}