/* ============================================================
   Design: Clean corporate style, referencing Gitee
   ============================================================ */
:root {
  --bg: #f6f6f6;
  --surface: #fff;
  --surface-alt: #fafafa;
  --border: #e5e5e5;
  --border-light: #eee;
  --text: #24292e;
  --text-secondary: #586069;
  --text-muted: #959da5;
  --accent: #4a6fa5;
  --accent-hover: #3d5d8a;
  --accent-light: #f0f4f8;
  --danger: #cb2431;
  --danger-light: #fff0f1;
  --warning: #f66a0a;
  --sidebar-w: 220px;
  --topbar-h: 50px;
  --radius: 4px;
  --radius-md: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 3px 12px rgba(0,0,0,0.08);
  --font: -apple-system,BlinkMacSystemFont,'Segoe UI',Helvetica,Arial,sans-serif,'Apple Color Emoji','Segoe UI Emoji';
  --transition: 0.15s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);height:100vh;overflow:hidden;font-size:14px;line-height:1.5}

/* ===== Login ===== */
.login-screen{
  position:fixed;inset:0;z-index:100;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:#0a0f1a;
}
.login-bg{
  position:absolute;inset:-40px;
  background:url('../img/login-bg.jpg') center/cover no-repeat;
  filter:blur(4px) brightness(0.85);
  z-index:0;
}
.login-bg::after{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse at center,transparent 50%,rgba(10,15,26,0.3) 100%);
}
/* Stage 1 — Landing */
.login-landing{position:relative;z-index:2;text-align:center;margin-top:15vh}
.login-landing .landing-buttons{display:flex;gap:120px;justify-content:center}
.login-landing .landing-btn{
  width:130px;padding:11px 0;border:1px solid rgba(255,255,255,0.08);
  border-radius:10px;cursor:pointer;font-size:14px;font-weight:400;
  transition:all 0.3s ease;outline:none;
  color:rgba(255,255,255,0.65);
  background:rgba(255,255,255,0.03);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:0 2px 12px rgba(0,0,0,0.08);
}
.login-landing .landing-btn:hover{
  background:rgba(255,255,255,0.1);border-color:rgba(255,255,255,0.18);color:#fff;
  box-shadow:0 4px 20px rgba(0,0,0,0.15);
  transform:translateY(-1px);
}
.login-footer{
  position:absolute;bottom:24px;z-index:2;
  color:rgba(255,255,255,0.18);font-size:12px;letter-spacing:2px;text-align:center;width:100%;
}

/* Stage 2 — Compact Form */
.login-form-panel{
  position:relative;z-index:2;display:none;
  width:320px;max-width:90vw;text-align:center;
}
.login-form-panel.show{display:block}
.login-form-panel .back-link{
  display:inline-block;cursor:pointer;color:rgba(255,255,255,0.35);font-size:12px;
  margin-bottom:18px;transition:color 0.2s;
}
.login-form-panel .back-link:hover{color:rgba(255,255,255,0.7)}
.login-form-panel .form-card{
  background:rgba(255,255,255,0.05);border:1px solid rgba(255,255,255,0.08);
  border-radius:10px;padding:24px 22px 20px;
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  text-align:left;
}
.login-form-panel .form-card h2{text-align:center;font-size:17px;font-weight:500;color:#fff;margin-bottom:16px}
.login-form-panel .field{margin-bottom:12px}
.login-form-panel .field label{display:block;font-size:11px;color:rgba(255,255,255,0.4);margin-bottom:3px;font-weight:500;text-transform:uppercase;letter-spacing:0.5px}
.login-form-panel .field input{
  width:100%;padding:8px 11px;background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.1);
  border-radius:4px;color:#fff;font-size:14px;outline:none;transition:var(--transition);
}
.login-form-panel .field input:focus{border-color:rgba(255,255,255,0.25)}
.login-form-panel .btn{
  width:100%;padding:10px;border:1px solid rgba(255,255,255,0.1);
  border-radius:8px;font-size:14px;font-weight:400;cursor:pointer;
  transition:all 0.25s ease;outline:none;
  color:rgba(255,255,255,0.85);
  background:rgba(255,255,255,0.06);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.login-form-panel .btn:hover{
  background:rgba(255,255,255,0.12);border-color:rgba(255,255,255,0.2);color:#fff;
}
.login-error{color:var(--danger);font-size:12px;text-align:center;margin-top:6px;min-height:16px}

/* Keep main app form-group etc for modal/settings */
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:13px;font-weight:500;color:var(--text);margin-bottom:4px}
.form-group input,.form-group select{
  width:100%;padding:9px 12px;background:var(--surface-alt);border:1px solid var(--border);
  border-radius:var(--radius);font-size:14px;color:var(--text);outline:none;transition:var(--transition);
}
.form-group input:focus{border-color:#999;box-shadow:0 0 0 2px rgba(0,0,0,0.06)}
.btn{display:inline-block;padding:9px 20px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;transition:var(--transition);text-align:center;outline:none;background:var(--surface);color:var(--text)}
.btn:hover{background:#f3f4f6}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}
.btn-danger{color:var(--danger);border-color:var(--danger)}
.btn-danger:hover{background:var(--danger-light)}
.btn-block{width:100%}

/* ===== App Shell ===== */
.app-shell{display:none;height:100vh;width:100vw}
.app-inner{display:flex;height:100%}

/* Menu toggle button */
.menu-toggle{
  display:flex;align-items:center;justify-content:center;
  width:32px;height:32px;border:none;background:none;cursor:pointer;
  color:var(--text-secondary);outline:none;border-radius:4px;flex-shrink:0;
}
.menu-toggle:hover{background:var(--surface-alt)}
.menu-toggle span{display:block;width:16px;height:2px;background:currentColor;position:relative;border-radius:1px}
.menu-toggle span::before,.menu-toggle span::after{
  content:'';display:block;width:16px;height:2px;background:currentColor;
  position:absolute;left:0;transition:transform 0.2s;border-radius:1px;
}
.menu-toggle span::before{top:-5px}
.menu-toggle span::after{top:5px}

/* Sidebar overlay (mobile) */
.sidebar-overlay{display:none}

/* Sidebar */
.sidebar{
  width:var(--sidebar-w);min-width:var(--sidebar-w);background:#24292e;
  display:flex;flex-direction:column;z-index:50;color:#fff;
  transition:width 0.25s ease,min-width 0.25s ease;
}
.sidebar.collapsed{--sidebar-w:56px}
.sidebar.collapsed .sidebar-head span,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .nav-item .chevron,
.sidebar.collapsed .sidebar-foot .uname,
.sidebar.collapsed .nav-sub{display:none}
.sidebar.collapsed .nav-item{padding:9px 16px;justify-content:center}
.sidebar.collapsed .sidebar-head{justify-content:center;padding:0}
.sidebar-head{
  height:var(--topbar-h);display:flex;align-items:center;gap:10px;
  padding:0 16px;flex-shrink:0;border-bottom:1px solid rgba(255,255,255,0.08);
  font-weight:600;font-size:15px;color:#fff;
}
.sidebar-head .logo-dot{
  width:26px;height:26px;border-radius:5px;background:var(--accent);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.sidebar-head .logo-dot svg{width:15px;height:15px;color:#fff}
.sidebar-nav{flex:1;overflow-y:auto;padding:8px 0}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:9px 16px;
  cursor:pointer;color:rgba(255,255,255,0.65);font-size:13px;font-weight:400;
  transition:all 0.12s ease;width:100%;border:none;background:none;text-align:left;outline:none;
}
.nav-item:hover{color:#fff;background:rgba(255,255,255,0.04)}
.nav-item.active{color:#fff;background:rgba(255,255,255,0.08);font-weight:500}
.nav-item .nav-icon{width:16px;height:16px;flex-shrink:0;opacity:0.55}
.nav-item.active .nav-icon{opacity:1}
.nav-item .chevron{width:10px;height:10px;margin-left:auto;opacity:0.35;transition:transform 0.2s}
.nav-item .chevron.open{transform:rotate(90deg)}
.nav-sub{overflow:hidden;max-height:0;transition:max-height 0.25s ease}
.nav-sub.open{max-height:200px}
.nav-sub .nav-item{padding-left:44px;font-size:12px}
.sidebar-foot{
  padding:10px 16px;border-top:1px solid rgba(255,255,255,0.08);
  display:flex;align-items:center;gap:10px;flex-shrink:0;
}
.sidebar-foot .avatar{
  width:28px;height:28px;border-radius:50%;background:var(--accent);
  display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0;
}
.sidebar-foot .uname{font-size:12px;color:rgba(255,255,255,0.6);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sidebar-foot .logout-btn{margin-left:auto;cursor:pointer;background:none;border:none;outline:none;padding:4px;color:rgba(255,255,255,0.4);transition:var(--transition);display:flex}
.sidebar-foot .logout-btn:hover{color:#fff}
.sidebar-foot .logout-btn svg{width:15px;height:15px}

/* Main */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg)}
.topbar{
  height:var(--topbar-h);flex-shrink:0;border-bottom:1px solid var(--border);
  display:flex;align-items:center;padding:0 20px;background:var(--surface);
}
.topbar .breadcrumb{font-size:13px;color:var(--text-muted);display:flex;align-items:center;gap:5px}
.topbar .breadcrumb .sep{color:var(--text-muted)}
.topbar .breadcrumb .current{color:var(--text);font-weight:500}
.content{flex:1;overflow-y:auto;padding:20px}
.page{display:none}
.page.show{display:block}

/* Stats */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 18px}
.stat-card .num{font-size:26px;font-weight:600;color:var(--text)}
.stat-card .lbl{font-size:12px;color:var(--text-muted);margin-top:2px}

/* Card */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px 20px;margin-bottom:14px}
.card h2{font-size:16px;font-weight:600;margin-bottom:6px}
.card h3{font-size:14px;font-weight:600;margin-bottom:4px;color:var(--text-secondary)}
.card p{color:var(--text-secondary);line-height:1.6;font-size:13px}

/* Table */
.tbl-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--border-light);font-size:13px}
th{color:var(--text-secondary);font-weight:600;font-size:12px;background:var(--surface-alt)}
tr:hover td{background:#fafbfc}
.badge{display:inline-block;padding:2px 8px;border-radius:12px;font-size:11px;font-weight:500}
.badge-admin{background:rgba(74,111,165,0.12);color:var(--accent)}
.badge-user{background:#f0f0f0;color:var(--text-secondary)}
.btn-sm{padding:3px 8px;font-size:11px;border-radius:var(--radius);border:1px solid var(--border);cursor:pointer;font-weight:500;transition:var(--transition);margin-right:4px;outline:none;background:var(--surface);color:var(--text-secondary);display:inline-flex;align-items:center;gap:3px}
.btn-sm:hover{background:var(--surface-alt)}
.btn-sm.danger{color:var(--danger);border-color:rgba(203,36,49,0.2)}
.btn-sm.danger:hover{background:var(--danger-light)}
.search-wrap{position:relative;margin-bottom:12px}
.search-wrap input{padding-left:32px}
.search-wrap svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}

/* Modal */
.modal-mask{display:none;position:fixed;inset:0;z-index:200;background:rgba(0,0,0,0.3);align-items:center;justify-content:center}
.modal-mask.show{display:flex}
.modal-box{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:20px 24px;width:400px;max-width:92vw;box-shadow:0 8px 32px rgba(0,0,0,0.12)}
.modal-box h3{margin-bottom:12px;font-size:15px}

/* Fireworks */
.fw-wrap{
  position:relative;width:100%;height:calc(100vh - var(--topbar-h) - 40px);
  border-radius:var(--radius-md);overflow:hidden;cursor:crosshair;
  background:#0a0a14;border:1px solid var(--border);
}
.fw-wrap canvas{display:block}
.fw-hint{position:absolute;top:18px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,0.35);font-size:12px;pointer-events:none;z-index:5;transition:opacity 0.5s}
.fw-bar{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:6px;z-index:5;background:rgba(0,0,0,0.6);border-radius:20px;padding:4px;border:1px solid rgba(255,255,255,0.06)}
.fw-chip{padding:6px 14px;border-radius:18px;border:none;cursor:pointer;font-size:12px;transition:var(--transition);background:transparent;color:rgba(255,255,255,0.7);outline:none;white-space:nowrap}
.fw-chip:hover{color:#fff}
.fw-chip.active{background:rgba(255,255,255,0.12);color:#fff;font-weight:500}

/* Color palette */
.color-palette{
  position:absolute;top:14px;right:14px;z-index:6;
  background:rgba(0,0,0,0.55);border-radius:10px;
  border:1px solid rgba(255,255,255,0.06);
  backdrop-filter:blur(4px);
  transition:all 0.3s ease;
  overflow:hidden;
}
.palette-toggle{
  display:flex;align-items:center;gap:6px;
  padding:8px 10px;cursor:pointer;background:none;border:none;
  color:rgba(255,255,255,0.5);font-size:11px;outline:none;width:100%;
  transition:color 0.2s;
}
.palette-toggle:hover{color:#fff}
.palette-toggle .toggle-dot{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,0.5);flex-shrink:0}
.palette-body{display:none;padding:0 12px 10px;flex-direction:column;gap:8px}
.palette-body.open{display:flex}
.color-row{display:flex;flex-wrap:wrap;gap:6px;max-width:210px}
.color-swatch{
  width:22px;height:22px;border-radius:50%;cursor:pointer;border:2px solid transparent;
  transition:var(--transition);position:relative;flex-shrink:0;
}
.color-swatch:hover{transform:scale(1.15)}
.color-swatch.active{border-color:#fff;box-shadow:0 0 6px rgba(255,255,255,0.4)}
.color-swatch.inactive{opacity:0.25}
.color-swatch .remove-x{
  position:absolute;top:-4px;right:-4px;width:12px;height:12px;
  border-radius:50%;background:rgba(0,0,0,0.7);color:#fff;font-size:9px;
  line-height:12px;text-align:center;display:none;cursor:pointer;
}
.color-swatch.custom:hover .remove-x{display:block}
.palette-actions{display:flex;gap:4px}
.palette-actions button{
  flex:1;padding:4px 0;font-size:10px;border:1px solid rgba(255,255,255,0.12);
  border-radius:3px;cursor:pointer;background:transparent;color:rgba(255,255,255,0.5);
  transition:var(--transition);outline:none;
}
.palette-actions button:hover{color:#fff;border-color:rgba(255,255,255,0.25)}
.palette-label{font-size:10px;color:rgba(255,255,255,0.35);text-align:center;letter-spacing:0.5px}
.palette-picker{display:flex;align-items:center;gap:8px}
.palette-picker input[type=color]{
  -webkit-appearance:none;width:26px;height:26px;border-radius:50%;
  border:1px solid rgba(255,255,255,0.15);cursor:pointer;background:none;padding:0;
}
.palette-picker input[type=color]::-webkit-color-swatch-wrapper{padding:0}
.palette-picker input[type=color]::-webkit-color-swatch{border-radius:50%;border:none}
.palette-picker span{font-size:10px;color:rgba(255,255,255,0.4)}

/* Messages tab */
.msg-tab{padding:8px 18px;border:none;background:none;cursor:pointer;font-size:14px;color:var(--text-muted);border-bottom:2px solid transparent;margin-bottom:-2px;transition:var(--transition);outline:none}
.msg-tab:hover{color:var(--text)}
.msg-tab.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
/* Message type selector */
.msg-type-btn{padding:4px 12px;border-radius:14px;border:1px solid var(--border);background:var(--surface);cursor:pointer;font-size:12px;color:var(--text-muted);transition:var(--transition);outline:none}
.msg-type-btn:hover{border-color:var(--accent);color:var(--accent)}
.msg-type-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}

/* Toast */
.toast-ctn{position:fixed;top:16px;right:16px;z-index:999;display:flex;flex-direction:column;gap:6px}
.toast{padding:8px 16px;border-radius:var(--radius);font-size:13px;font-weight:500;animation:toastIn 0.25s ease;color:#fff;max-width:280px}
.toast-ok{background:var(--accent)}
.toast-err{background:var(--danger)}
@keyframes toastIn{from{transform:translateX(100%);opacity:0}}

/* Scrollbar */
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(0,0,0,0.1);border-radius:10px}

@media(max-width:768px){
  /* Sidebar as overlay on mobile */
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;z-index:300;
    width:220px;min-width:220px;
    transform:translateX(-100%);transition:transform 0.25s ease;
  }
  .sidebar.open{transform:translateX(0);box-shadow:4px 0 20px rgba(0,0,0,0.3)}
  .sidebar.collapsed{--sidebar-w:220px}
  .sidebar-overlay{
    display:none;position:fixed;inset:0;z-index:299;background:rgba(0,0,0,0.4);
  }
  .sidebar-overlay.show{display:block}

  .menu-toggle{display:flex;margin-right:4px}
  .content{padding:12px}
  .topbar{padding:0 10px}
  .stat-row{grid-template-columns:repeat(2,1fr);gap:8px}
  .stat-card{padding:12px 14px}
  .stat-card .num{font-size:22px}
  th,td{padding:6px 8px;font-size:11px}
  .color-palette{top:8px;right:8px}
  .color-row{max-width:160px;gap:4px}
  .color-swatch{width:18px;height:18px}
  .fw-bar{gap:3px;padding:3px}
  .fw-chip{padding:5px 10px;font-size:11px}
  .fw-hint{font-size:11px;top:10px}
  .card{padding:14px 16px}
  .card h2{font-size:15px}
  .modal-box{padding:16px 18px}
  .toast{max-width:220px;font-size:12px}
  .login-landing .landing-buttons{gap:36px}
  .login-landing .landing-btn{width:90px;padding:8px 0;font-size:12px}
  .login-form-panel .form-card{padding:16px 14px 14px}
  .login-footer{font-size:10px;bottom:14px}
}

@media(hover:none){
  .nav-item:hover{background:none}
}