* { box-sizing: border-box; margin: 0; padding: 0; }

:root{
    --bg:#0a0e1a;
    --bg2:#121826;
    --panel:rgba(255,255,255,.04);
    --border:rgba(120,200,255,.18);
    --neon:#00e5ff;
    --neon2:#7c5cff;
    --text:#e6f2ff;
    --muted:#8ba3c7;
    --danger:#ff4d6d;
}

body{
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(0,229,255,.15), transparent 60%),
        radial-gradient(1000px 500px at 100% 0%, rgba(124,92,255,.18), transparent 60%),
        linear-gradient(160deg,#05070f 0%, #0a0e1a 40%, #0d1220 100%);
    color:var(--text);
    min-height:100vh;
    overflow-x:hidden;
}

body::before{
    content:"";
    position:fixed;inset:0;
    background-image:
        linear-gradient(rgba(0,229,255,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,229,255,.05) 1px, transparent 1px);
    background-size:40px 40px;
    pointer-events:none;
    z-index:0;
}

body::after{
    content:"";
    position:fixed;top:0;left:0;right:0;height:2px;
    background:linear-gradient(90deg, transparent, var(--neon), var(--neon2), var(--neon), transparent);
    background-size:200% 100%;
    animation:flow 4s linear infinite;
    z-index:100;
}
@keyframes flow{to{background-position:200% 0}}

/* ===== 布局 ===== */
.layout{display:flex;min-height:100vh;position:relative;z-index:1;}

.sidebar{
    width:230px;
    background:linear-gradient(180deg, rgba(12,18,32,.95), rgba(8,12,22,.95));
    border-right:1px solid var(--border);
    backdrop-filter: blur(12px);
    padding:0 0 20px;
    position:fixed;top:0;bottom:0;left:0;
    display:flex;flex-direction:column;
    z-index:10;
}

.sidebar-logo{
    padding:18px 14px 14px;
    border-bottom:1px solid var(--border);
    margin-bottom:12px;
    text-align:center;
}
.sidebar-logo .logo-ring{
    width:64px;height:64px;
    margin:0 auto 10px;
    border-radius:50%;
    padding:3px;
    background:linear-gradient(135deg,var(--neon),var(--neon2),var(--neon));
    background-size:200% 200%;
    animation:flow 4s linear infinite;
    box-shadow:0 0 18px rgba(0,229,255,.55), 0 0 40px rgba(124,92,255,.35);
}
.sidebar-logo .logo-ring img{
    width:100%;height:100%;
    border-radius:50%;
    object-fit:cover;
    display:block;
    background:#0a0e1a;
}
.sidebar-logo .brand{
    font-size:15px;font-weight:800;letter-spacing:3px;
    background:linear-gradient(90deg,#fff,var(--neon),var(--neon2),#fff);
    background-size:200% auto;
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
    animation:flow 5s linear infinite;
    margin-bottom:8px;
}
.sidebar-logo .quote{
    font-size:11px;color:var(--muted);line-height:1.6;
    padding:0 6px;font-style:italic;transition:opacity .4s;
    display:inline-block;
}
.sidebar-logo .quote::after{
    content:"";display:block;width:60%;height:1px;margin:6px auto 0;
    background:linear-gradient(90deg,transparent,var(--neon),transparent);
    opacity:.7;
}

.nav{display:flex;flex-direction:column}
.nav a{
    display:flex;align-items:center;gap:12px;
    padding:13px 24px;
    color:var(--muted);text-decoration:none;
    font-size:14px;
    border-left:3px solid transparent;
    transition:.25s;
}
.nav a:hover{
    background:rgba(0,229,255,.06);color:var(--text);
    border-left-color:var(--neon);
    box-shadow: inset 0 0 20px rgba(0,229,255,.08);
}
.nav a.active{
    background:linear-gradient(90deg, rgba(0,229,255,.15), transparent);
    color:#fff;border-left-color:var(--neon);
    text-shadow:0 0 8px rgba(0,229,255,.8);
}
.nav .icon{width:20px;text-align:center;font-size:16px;}

.sidebar .logout{
    margin-top:auto;padding:16px 24px;
    border-top:1px solid var(--border);
}
.sidebar .logout a{color:var(--danger);text-decoration:none;font-size:13px;}

.main{
    margin-left:230px;flex:1;
    padding:32px 40px;
    position:relative;z-index:1;
}

.page-title{
    font-size:24px;font-weight:700;margin-bottom:24px;
    display:flex;align-items:center;gap:10px;
}
.page-title::before{
    content:"";width:4px;height:22px;border-radius:2px;
    background:linear-gradient(180deg,var(--neon),var(--neon2));
    box-shadow:0 0 12px var(--neon);
}

.card{
    background:var(--panel);
    border:1px solid var(--border);
    border-radius:14px;
    padding:24px;
    backdrop-filter:blur(10px);
    box-shadow:0 8px 40px rgba(0,0,0,.35);
    position:relative;overflow:hidden;margin-bottom:20px;
}
.card::before{
    content:"";position:absolute;top:0;left:0;right:0;height:1px;
    background:linear-gradient(90deg,transparent,var(--neon),transparent);
    opacity:.6;
}

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:13px 12px;text-align:left;border-bottom:1px solid var(--border)}
th{color:var(--neon);font-weight:600;font-size:13px;letter-spacing:.5px;text-transform:uppercase}
tbody tr{transition:.2s}
tbody tr:hover{background:rgba(0,229,255,.05)}

.btn{
    display:inline-flex;align-items:center;gap:6px;
    padding:8px 16px;
    background:linear-gradient(135deg,var(--neon),var(--neon2));
    color:#031018;font-weight:700;
    text-decoration:none;border:none;border-radius:8px;
    cursor:pointer;font-size:13px;transition:.25s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,229,255,.35)}
.btn.danger{background:linear-gradient(135deg,#ff4d6d,#ff8a5b);color:#fff}
.btn.gray{background:rgba(255,255,255,.08);color:var(--text);border:1px solid var(--border);box-shadow:none}
.btn.gray:hover{background:rgba(255,255,255,.14)}

input,select,textarea{
    width:100%;padding:10px 14px;
    background:rgba(0,0,0,.35);
    border:1px solid var(--border);border-radius:8px;
    color:var(--text);font-size:14px;font-family:inherit;
    transition:.2s;outline:none;
}
input:focus,select:focus,textarea:focus{
    border-color:var(--neon);
    box-shadow:0 0 0 3px rgba(0,229,255,.15);
}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.field{margin-bottom:18px}

.msg{padding:10px 14px;border-radius:8px;background:rgba(0,229,255,.1);color:var(--neon);border:1px solid var(--border);margin-bottom:16px;font-size:13px}
.err{padding:10px 14px;border-radius:8px;background:rgba(255,77,109,.12);color:var(--danger);border:1px solid rgba(255,77,109,.3);margin-bottom:16px;font-size:13px}

.auth-wrap{
    display:flex;align-items:center;justify-content:center;
    min-height:100vh;padding:20px;position:relative;z-index:1;
}
.auth-card{
    width:100%;max-width:420px;
    background:rgba(12,18,32,.85);
    border:1px solid var(--border);
    border-radius:18px;
    padding:44px 36px;
    backdrop-filter:blur(20px);
    box-shadow:0 20px 60px rgba(0,0,0,.55), 0 0 80px rgba(0,229,255,.08) inset;
    position:relative;overflow:hidden;
    animation:fadeUp .6s ease;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
.auth-card::before{
    content:"";position:absolute;top:-1px;left:20%;right:20%;height:1px;
    background:linear-gradient(90deg,transparent,var(--neon),transparent);
}
.auth-card h1{
    font-size:26px;text-align:center;margin-bottom:8px;
    background:linear-gradient(90deg,var(--neon),var(--neon2));
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;letter-spacing:1px;
}
.auth-card .sub{text-align:center;color:var(--muted);font-size:13px;margin-bottom:28px}
.auth-card .btn{width:100%;justify-content:center;padding:12px;font-size:15px;margin-top:8px}
.auth-card .bottom-link{text-align:center;margin-top:22px;font-size:13px;color:var(--muted)}
.auth-card .bottom-link a{color:var(--neon);text-decoration:none;font-weight:600;text-shadow:0 0 8px rgba(0,229,255,.4)}
.auth-card .bottom-link a:hover{text-decoration:underline}

.front-wrap{max-width:860px;margin:0 auto;padding:40px 20px 80px;position:relative;z-index:1;}
.front-header{text-align:center;margin-bottom:36px;position:relative;}
.front-header h1{
    font-size:32px;font-weight:800;
    background:linear-gradient(90deg,var(--neon),var(--neon2),var(--neon));
    background-size:200% auto;
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
    animation:flow 5s linear infinite;letter-spacing:1px;
}
.front-header p{color:var(--muted);font-size:14px;margin-top:8px}

.file-item{
    display:flex;align-items:center;justify-content:space-between;
    background:var(--panel);border:1px solid var(--border);
    border-radius:12px;padding:18px 22px;margin-bottom:12px;
    backdrop-filter:blur(10px);transition:.25s;
    position:relative;overflow:hidden;
}
.file-item::before{
    content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
    background:linear-gradient(180deg,var(--neon),var(--neon2));
    opacity:0;transition:.25s;
}
.file-item:hover{
    transform:translateX(4px);
    border-color:rgba(0,229,255,.4);
    box-shadow:0 8px 30px rgba(0,229,255,.12);
}
.file-item:hover::before{opacity:1}
.file-name{font-size:15px;font-weight:600;color:#fff;margin-bottom:4px;word-break:break-all}
.file-meta{font-size:12px;color:var(--muted)}
.file-meta span{margin-right:12px}
.file-item .btn{padding:8px 18px;font-size:13px}

.empty{text-align:center;padding:60px 20px;color:var(--muted);}
.empty .big{font-size:48px;margin-bottom:16px;opacity:.5}

/* ===== 统计卡片 ===== */
.stat-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(170px, 1fr));
    gap:14px;margin-bottom:20px;
}
.stat-card{
    background:var(--panel);border:1px solid var(--border);
    border-radius:12px;padding:16px 18px;
    backdrop-filter:blur(10px);position:relative;overflow:hidden;transition:.25s;
}
.stat-card::before{
    content:"";position:absolute;top:0;left:0;right:0;height:2px;
    background:linear-gradient(90deg,transparent,var(--neon),transparent);
    opacity:.7;
}
.stat-card:hover{
    transform:translateY(-3px);border-color:rgba(0,229,255,.45);
    box-shadow:0 8px 26px rgba(0,229,255,.15);
}
.stat-card .label{font-size:12px;color:var(--muted);margin-bottom:8px;letter-spacing:.5px;text-transform:uppercase}
.stat-card .value{
    font-size:24px;font-weight:800;
    background:linear-gradient(90deg,#fff,var(--neon));
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;
}
.stat-card .value small{font-size:12px;color:var(--muted);margin-left:4px;-webkit-text-fill-color:var(--muted)}

/* ===== 曲线图 ===== */
.chart-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(340px, 1fr));
    gap:18px;margin-bottom:22px;
}
.chart-card{
    background:var(--panel);border:1px solid var(--border);
    border-radius:14px;padding:18px 18px 14px;
    backdrop-filter:blur(10px);position:relative;overflow:hidden;transition:.25s;
}
.chart-card::before{
    content:"";position:absolute;top:0;left:0;right:0;height:1px;
    background:linear-gradient(90deg,transparent,var(--neon),transparent);opacity:.5;
}
.chart-card:hover{border-color:rgba(0,229,255,.4);box-shadow:0 8px 30px rgba(0,229,255,.12);}
.chart-card h3{
    font-size:14px;color:var(--neon);margin-bottom:14px;font-weight:600;
    display:flex;justify-content:space-between;align-items:center;
}
.chart-card h3 span{font-size:12px;color:var(--muted);font-weight:400}
.chart-box{position:relative;width:100%;height:200px;}
.chart-box canvas{position:absolute !important;inset:0;width:100% !important;height:100% !important;}

.info-row{
    display:flex;justify-content:space-between;
    padding:12px 0;border-bottom:1px dashed var(--border);font-size:14px;
}
.info-row:last-child{border-bottom:none}
.info-row .k{color:var(--muted)}
.info-row .v{color:var(--neon);font-weight:600}

/* ============================================================
   前台音乐图标（music-disc）
   ============================================================ */
.music-disc{
    position:fixed;
    top:28px;right:28px;
    width:58px;height:58px;
    border-radius:50%;
    background:
        radial-gradient(circle at 30% 30%, rgba(255,255,255,.15), transparent 60%),
        linear-gradient(135deg, rgba(12,18,32,.95), rgba(8,12,22,.9));
    border:1.5px solid rgba(0,229,255,.55);
    color:var(--neon);
    display:flex;align-items:center;justify-content:center;
    font-size:24px;
    cursor:pointer;
    backdrop-filter:blur(12px);
    box-shadow:
        0 0 0 4px rgba(0,229,255,.08),
        0 0 24px rgba(0,229,255,.45),
        0 8px 24px rgba(0,0,0,.5),
        inset 0 0 12px rgba(0,229,255,.25);
    z-index:999;
    user-select:none;
    transition:transform .25s, box-shadow .25s, background .3s;
    animation:musicSpin 6s linear infinite;
    -webkit-tap-highlight-color:transparent;
}
.music-disc::before{
    content:"";position:absolute;inset:6px;border-radius:50%;
    background:repeating-radial-gradient(circle at 50% 50%,
        rgba(0,229,255,.12) 0 1px, transparent 1px 4px);
    pointer-events:none;opacity:.6;
}
.music-disc::after{
    content:"";position:absolute;width:8px;height:8px;border-radius:50%;
    background:var(--neon);
    box-shadow:0 0 10px var(--neon), 0 0 20px var(--neon);
    pointer-events:none;opacity:.9;
}
.music-disc:hover{
    transform:scale(1.08);
    box-shadow:
        0 0 0 6px rgba(0,229,255,.12),
        0 0 32px rgba(0,229,255,.7),
        0 8px 28px rgba(0,0,0,.55),
        inset 0 0 16px rgba(0,229,255,.4);
}
.music-disc.playing{
    background:
        radial-gradient(circle at 30% 30%, rgba(255,255,255,.35), transparent 55%),
        linear-gradient(135deg, var(--neon), var(--neon2));
    color:#031018;
    border-color:#fff;
    box-shadow:
        0 0 0 6px rgba(0,229,255,.2),
        0 0 40px rgba(0,229,255,.85),
        0 10px 30px rgba(0,0,0,.5),
        inset 0 0 20px rgba(255,255,255,.35);
    animation:musicSpin 3s linear infinite;
}
.music-disc.playing::after{background:#031018;box-shadow:0 0 10px #031018;}
.music-disc.paused{animation-play-state:paused;opacity:.75;border-color:rgba(0,229,255,.35);}

@keyframes musicSpin{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}

/* ============================================================
   手机端适配（<=768px）
   ============================================================ */
@media (max-width:768px){
    body{font-size:14px;}
    .layout{display:block;}

    .sidebar{
        position:fixed;top:0;left:0;right:0;bottom:auto;
        width:100%;height:auto;padding:8px 10px;
        background:linear-gradient(180deg, rgba(12,18,32,.98), rgba(8,12,22,.92));
        backdrop-filter:blur(14px);
        border-right:none;border-bottom:1px solid var(--border);
        box-shadow:0 4px 20px rgba(0,0,0,.5);z-index:100;
        display:flex;flex-direction:row;align-items:center;gap:10px;
    }
    .sidebar-logo{display:flex;align-items:center;gap:10px;padding:0;margin:0;border-bottom:none;flex-shrink:0;}
    .sidebar-logo .logo-ring{width:38px;height:38px;margin:0;padding:2px;box-shadow:0 0 12px rgba(0,229,255,.5);}
    .sidebar-logo .brand{font-size:13px;letter-spacing:1.5px;margin:0;}
    .sidebar-logo .quote{display:none;}

    .nav{
        flex:1;display:flex;flex-direction:row;
        overflow-x:auto;overflow-y:hidden;white-space:nowrap;
        gap:2px;-webkit-overflow-scrolling:touch;scrollbar-width:none;
    }
    .nav::-webkit-scrollbar{display:none;}
    .nav a{
        flex-shrink:0;padding:8px 12px;font-size:12px;
        border-left:none;border-bottom:2px solid transparent;
        border-radius:8px;gap:6px;
    }
    .nav a.active{background:rgba(0,229,255,.15);border-left:none;border-bottom:2px solid var(--neon);}
    .nav a:hover{background:rgba(0,229,255,.06);border-left:none;}
    .nav .icon{font-size:15px;}

    .sidebar .logout{margin:0;padding:6px 10px;border-top:none;border-left:1px solid var(--border);flex-shrink:0;}
    .sidebar .logout a{font-size:12px;}

    .main{margin-left:0;margin-top:64px;padding:16px 12px 40px;}
    .page-title{font-size:18px;margin-bottom:16px;}
    .page-title::before{height:18px;width:3px;}

    .card{padding:16px 14px;border-radius:12px;margin-bottom:14px;overflow-x:auto;}
    table{font-size:12px;min-width:520px;}
    th,td{padding:9px 8px;}
    .btn{padding:7px 12px;font-size:12px;border-radius:6px;white-space:nowrap;}

    input,select,textarea{padding:10px 12px;font-size:14px;}
    .field{margin-bottom:14px;}
    label{font-size:12px;}

    .auth-card{padding:32px 22px;border-radius:16px;max-width:100%;}
    .auth-card h1{font-size:22px;}
    .auth-card .sub{font-size:12px;margin-bottom:22px;}
    .auth-card .btn{padding:11px;font-size:14px;}
    .auth-card .bottom-link{font-size:12px;}

    .front-wrap{padding:24px 14px 80px;}
    .front-header{margin-bottom:24px;}
    .front-header h1{font-size:22px;letter-spacing:.5px;}
    .front-header p{font-size:12px;}

    .file-item{
        padding:14px 14px;border-radius:10px;margin-bottom:10px;
        flex-direction:column;align-items:flex-start;gap:10px;
    }
    .file-item .btn{align-self:flex-end;padding:8px 18px;}
    .file-name{font-size:14px;}
    .file-meta{font-size:11px;}
    .file-meta span{margin-right:8px;}

    .stat-grid{grid-template-columns:repeat(2, 1fr);gap:10px;margin-bottom:16px;}
    .stat-card{padding:14px 14px;border-radius:10px;}
    .stat-card .label{font-size:11px;margin-bottom:6px;letter-spacing:0;}
    .stat-card .value{font-size:19px;}
    .stat-card .value small{font-size:11px;}

    .chart-grid{grid-template-columns:1fr;gap:12px;margin-bottom:16px;}
    .chart-card{padding:14px 12px 10px;border-radius:10px;}
    .chart-card h3{font-size:13px;margin-bottom:10px;}
    .chart-card h3 span{font-size:11px;}
    .chart-box{height:200px;}

    .info-row{font-size:13px;padding:10px 0;flex-direction:column;gap:4px;}
    .info-row .v{font-size:14px;}

    .empty{padding:40px 16px;}
    .empty .big{font-size:38px;}

    .main > div[style*="justify-content:space-between"]{
        flex-direction:column;align-items:flex-start !important;gap:10px;
    }

    form[style*="display:flex"]{
        flex-direction:column !important;align-items:stretch !important;
    }
    form[style*="display:flex"] input[type="file"]{width:100%;}
    form[style*="display:flex"] button{width:100%;}

    audio{width:100% !important;max-width:100% !important;}

    .msg,.err{padding:9px 12px;font-size:12px;margin-bottom:12px;}
    .sidebar-logo .quote::after{display:none;}

    /* 手机端音乐图标移到右下角 */
    .music-disc{
        top:auto;bottom:22px;right:18px;
        width:50px;height:50px;font-size:22px;
        box-shadow:
            0 0 0 3px rgba(0,229,255,.08),
            0 0 20px rgba(0,229,255,.5),
            0 6px 18px rgba(0,0,0,.5);
    }
}

@media (max-width:380px){
    .stat-grid{grid-template-columns:1fr;}
    .sidebar-logo .brand{font-size:12px;}
    .nav a{padding:7px 10px;font-size:11px;}
    .main{margin-top:60px;}
    .front-header h1{font-size:19px;}
    .chart-box{height:170px;}
}