/* 陌城网络-在线音乐平台 - 白色主题 UI
   主色: 白 + 浅灰; 强调: 紫蓝渐变 + 抹茶绿 */
:root{
  --bg:#ffffff; --panel:#ffffff; --ink:#1f2330; --muted:#8b93a7;
  --line:#eceef3; --line2:#e3e6ee; --soft:#f6f7fb; --soft2:#eef0f6;
  --primary:#6366f1; --primary-d:#4f46e5; --primary-l:#eef2ff;
  --accent:#14b8a6; --danger:#ef4444; --warn:#f59e0b; --ok:#22c55e;
  --radius:14px; --radius-sm:9px;
  --shadow:0 1px 2px rgba(17,24,39,.04),0 8px 24px rgba(17,24,39,.06);
  --shadow-lg:0 12px 40px rgba(17,24,39,.12);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:var(--primary-d);text-decoration:none}
a:hover{color:var(--primary)}
img{max-width:100%;display:block}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* topbar */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(8px)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink)}
.brand-mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;font-size:18px;background:linear-gradient(135deg,var(--primary),var(--accent))}
.brand-sub{color:var(--muted);font-weight:500;margin-left:4px;font-size:13px}
.nav{display:flex;align-items:center;gap:18px}
.nav a{color:var(--ink);font-weight:500;font-size:14px}
.nav a:hover{color:var(--primary)}
.nav-user,.nav-admin{background:var(--soft);padding:6px 12px;border-radius:999px;font-size:13px}
.nav-admin{background:var(--primary-l);color:var(--primary-d)}

/* 汉堡按钮: PC 隐藏，手机显示 */
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:38px;height:38px;padding:0;background:transparent;border:1px solid var(--line2);
  border-radius:9px;cursor:pointer;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);margin:0 auto;transition:.25s;border-radius:2px}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 抽屉菜单: PC 隐藏，手机展开 */
.nav-drawer{
  display:none;border-top:1px solid var(--line);background:#fff;padding:8px 0;
  box-shadow:0 8px 24px rgba(17,24,39,.06);
}
.nav-drawer a{
  display:block;padding:12px 20px;color:var(--ink);font-size:15px;font-weight:500;
  border-left:3px solid transparent;
}
.nav-drawer a:hover{background:var(--soft);color:var(--primary-d)}
.nav-drawer .drawer-user{color:var(--muted);font-size:13px;pointer-events:none;background:var(--soft)}
.nav-drawer .drawer-register{background:var(--primary);color:#fff;margin:8px 16px;border-radius:9px;text-align:center;border-left:none}
.nav-drawer .drawer-register:hover{background:var(--primary-d);color:#fff}
.nav-drawer .drawer-logout{color:var(--danger)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:var(--radius-sm);border:1px solid var(--line2);background:#fff;color:var(--ink);font-size:14px;font-weight:500;cursor:pointer;transition:.15s}
.btn:hover{border-color:var(--primary);color:var(--primary-d)}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-d);color:#fff}
.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn-danger:hover{background:#dc2626;color:#fff}
.btn-ghost{background:transparent;border-color:transparent;color:var(--ink)}
.btn-ghost:hover{background:var(--soft);border-color:var(--line)}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-block{width:100%;justify-content:center}

/* forms */
.form-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px;max-width:440px;margin:40px auto;box-shadow:var(--shadow)}
.form-card.wide{max-width:760px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px}
.field .hint{font-size:12px;color:var(--muted);margin-top:5px}
.input,.textarea,.select{width:100%;padding:10px 12px;border:1px solid var(--line2);border-radius:var(--radius-sm);background:#fff;color:var(--ink);font-size:14px;font-family:inherit;transition:.15s}
.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}
.textarea{min-height:90px;resize:vertical}
.input-err{border-color:var(--danger)}
.form-title{font-size:20px;font-weight:700;margin:0 0 6px}
.form-sub{color:var(--muted);font-size:13px;margin:0 0 22px}
.form-foot{margin-top:8px;font-size:13px;color:var(--muted)}

/* alerts */
.alert{padding:11px 16px;border-radius:var(--radius-sm);margin:18px 0;font-size:14px;font-weight:500}
.alert-success{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}
.alert-error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}
.alert-warn{background:#fffbeb;color:#b45309;border:1px solid #fde68a}

/* grid of music cards */
.section-head{display:flex;align-items:center;justify-content:space-between;margin:34px 0 18px}
.section-head h2{font-size:20px;margin:0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.18s;cursor:pointer}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--primary-l)}
.card-cover{aspect-ratio:1;background:var(--soft2);position:relative;overflow:hidden}
.card-cover img{width:100%;height:100%;object-fit:cover}
.card-cover .ph{width:100%;height:100%;display:grid;place-items:center;color:var(--muted);font-size:40px;background:linear-gradient(135deg,#f3f4fb,#eef0f6)}
.card-body{padding:12px 14px 14px}
.card-title{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-artist{font-size:12px;color:var(--muted);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-meta{display:flex;justify-content:space-between;margin-top:8px;font-size:11px;color:var(--muted)}

/* player page */
.player-wrap{display:grid;grid-template-columns:300px 1fr;gap:36px;margin-top:30px;align-items:start}
@media(max-width:760px){.player-wrap{grid-template-columns:1fr}}
.cover-big{aspect-ratio:1;border-radius:18px;overflow:hidden;background:var(--soft2);box-shadow:var(--shadow-lg)}
.cover-big img{width:100%;height:100%;object-fit:cover}
.cover-big .ph{width:100%;height:100%;display:grid;place-items:center;font-size:80px;color:var(--muted);background:linear-gradient(135deg,#f3f4fb,#e8ebf5)}
.player-info h1{margin:0 0 6px;font-size:26px}
.player-info .artist{font-size:16px;color:var(--muted);margin-bottom:6px}
.player-info .stats{font-size:13px;color:var(--muted);margin-bottom:20px}
.audio-box{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:18px 0;box-shadow:var(--shadow)}
audio{width:100%}
.node-status{font-size:12px;color:var(--muted);margin-top:10px;display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ok)}
.actions{display:flex;gap:10px;margin:16px 0}

/* comments */
.comments{margin-top:30px}
.comment{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:grid;place-items:center;font-weight:600;flex-shrink:0}
.comment-body{flex:1}
.comment-head{display:flex;justify-content:space-between;font-size:13px}
.comment-user{font-weight:600}
.comment-time{color:var(--muted);font-size:12px}
.comment-text{margin-top:3px;font-size:14px}

/* admin */
.admin-wrap{display:grid;grid-template-columns:220px 1fr;gap:28px;margin-top:24px}
@media(max-width:760px){.admin-wrap{grid-template-columns:1fr}}
.admin-side{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px;height:fit-content;position:sticky;top:80px}
.admin-side a{display:block;padding:9px 14px;border-radius:9px;color:var(--ink);font-size:14px;margin-bottom:2px}
.admin-side a:hover{background:var(--soft)}
.admin-side a.active{background:var(--primary-l);color:var(--primary-d);font-weight:600}
.admin-main{min-width:0}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel + .panel{margin-top:20px}
.panel h3{margin:0 0 16px;font-size:17px}

table.tbl{width:100%;border-collapse:collapse;font-size:14px}
table.tbl th,table.tbl td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}
table.tbl th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:600;background:var(--soft)}
table.tbl tr:hover td{background:#fafbff}
.badge{display:inline-block;padding:3px 9px;border-radius:999px;font-size:12px;font-weight:600}
.badge-ok{background:#ecfdf5;color:#047857}
.badge-off{background:#f3f4f6;color:#6b7280}
.badge-warn{background:#fffbeb;color:#b45309}

.stat-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.stat .num{font-size:26px;font-weight:700}
.stat .lbl{font-size:13px;color:var(--muted);margin-top:2px}

.upload-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:760px){.upload-grid{grid-template-columns:1fr}}
.drop{border:2px dashed var(--line2);border-radius:var(--radius);padding:30px;text-align:center;color:var(--muted);background:var(--soft);transition:.15s;cursor:pointer}
.drop:hover,.drop.drag{border-color:var(--primary);background:var(--primary-l);color:var(--primary-d)}
.drop input{display:none}
.muted{color:var(--muted)}
.small{font-size:13px}
.right{text-align:right}
.mt-12{margin-top:12px}.mt-18{margin-top:18px}.mt-24{margin-top:24px}
.flex{display:flex}.flex-between{display:flex;justify-content:space-between;align-items:center}.gap{gap:10px}
.empty{text-align:center;padding:60px 20px;color:var(--muted)}
.footer{border-top:1px solid var(--line);padding:24px 0;margin-top:50px;color:var(--muted);font-size:13px}
.footer .container{display:flex;justify-content:space-between;align-items:center}
.spin{animation:sp 1s linear infinite}@keyframes sp{to{transform:rotate(360deg)}}
.progress{height:6px;background:var(--soft2);border-radius:6px;overflow:hidden;margin-top:10px}
.progress > div{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));width:0;transition:width .2s}

/* ============ 移动端响应式适配 ============ */

/* 视口基础设置: 字号随屏宽缩放，避免小屏文字过大 */
html{-webkit-text-size-adjust:100%}

/* 平板及以下 (≤960px): 收紧容器与栅格 */
@media (max-width:960px){
  .container{padding:0 16px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
  .player-wrap{grid-template-columns:260px 1fr;gap:24px}
  .player-info h1{font-size:22px}
}

/* 手机端 (≤760px): 单列布局、汉堡菜单、表格横滚 */
@media (max-width:760px){
  /* 导航栏: 隐藏常规导航，显示汉堡按钮 */
  .topbar-inner{height:54px}
  .brand{font-size:16px;gap:8px}
  .brand-mark{width:30px;height:30px;font-size:16px;border-radius:8px}
  .brand-sub{display:none}
  .nav{display:none}
  .nav-toggle{display:flex}
  .nav-drawer{display:block}
  .nav-drawer[hidden]{display:none}

  /* 内容区上下间距收紧 */
  .content{padding-top:8px}
  .section-head{margin:22px 0 14px;flex-wrap:wrap;gap:10px}
  .section-head h2{font-size:18px}

  /* 卡片网格: 2 列，间距更小 */
  .grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .card-body{padding:10px 12px}
  .card-title{font-size:13px}
  .card-artist{font-size:11px}

  /* 播放页: 单列，封面居中，标题缩小 */
  .player-wrap{grid-template-columns:1fr;gap:20px;margin-top:18px}
  .cover-big{max-width:280px;margin:0 auto}
  .player-info h1{font-size:20px}
  .player-info .artist{font-size:14px}
  .player-info .stats{font-size:12px;margin-bottom:14px}
  .actions{flex-wrap:wrap}
  .audio-box{padding:14px;margin:14px 0}

  /* 表单卡片: 减小内边距 */
  .form-card{padding:20px 18px;margin:24px auto}
  .form-title{font-size:18px}
  .upload-grid{grid-template-columns:1fr;gap:16px}
  .drop{padding:20px}

  /* 后台: 侧栏变为顶部横向滚动条 */
  .admin-wrap{grid-template-columns:1fr;gap:16px;margin-top:16px}
  .admin-side{
    position:static;sticky:none;
    display:flex;gap:6px;overflow-x:auto;
    padding:8px;border-radius:12px;
    -webkit-overflow-scrolling:touch;
  }
  .admin-side a{white-space:nowrap;padding:7px 12px;margin:0;font-size:13px}
  .admin-side hr{display:none}
  .panel{padding:16px 14px}

  /* 统计卡: 2 列 */
  .stat-row{grid-template-columns:repeat(2,1fr);gap:12px}
  .stat{padding:14px}
  .stat .num{font-size:22px}

  /* 表格: 横向滚动，避免撑破容器 */
  .panel:has(table.tbl){padding:0}
  .tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  table.tbl{min-width:560px}
  table.tbl th,table.tbl td{padding:9px 10px;font-size:13px;white-space:nowrap}

  /* 评论: 头像缩小 */
  .comment{gap:10px;padding:12px 0}
  .avatar{width:32px;height:32px;font-size:13px}
  .comment-head{flex-direction:column;gap:2px}
  .comment-time{font-size:11px}

  /* 页脚: 堆叠 */
  .footer .container{flex-direction:column;gap:6px;text-align:center}

  /* 按钮: 全宽更易点击 */
  .btn-block{width:100%}
}

/* 小屏手机 (≤480px): 进一步紧凑 */
@media (max-width:480px){
  .container{padding:0 12px}
  .grid{gap:10px}
  .card-meta{font-size:10px}
  .player-info h1{font-size:18px}
  .form-card{padding:18px 14px;margin:18px auto}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .nav-drawer a{padding:11px 16px;font-size:14px}
}

/* 触摸设备: 去掉 hover 动效，点击反馈更直接 */
@media (hover:none){
  .card:hover{transform:none;box-shadow:var(--shadow)}
  .btn:hover{border-color:var(--line2);color:var(--ink)}
  .btn-primary:hover{background:var(--primary);color:#fff}
}