:root {
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-dark: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.12);
  
  --bg-app: #f1f5f9;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  
  --text: #0f172a;
  --text-sub: #334155;
  --text-muted: #64748b;
  
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 15px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
}

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

body {
  font-family: 'Pretendard', -apple-system, system-ui, sans-serif;
  background-color: var(--bg-app);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

/* ===== Sharper Layout ===== */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  height: 100vh;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  margin-left: 240px;
  padding: 24px 32px;
  width: calc(100% - 240px);
  max-width: 1400px;
}

/* Sidebar Nav */
.sidebar-header { padding: 28px 20px; display: flex; align-items: center; gap: 10px; }
.sidebar-logo { font-size: 24px; }
.sidebar-brand { font-size: 16px; font-weight: 800; color: var(--accent); letter-spacing: -0.5px; }

.sidebar-nav { padding: 4px 12px; flex: 1; }
.nav-group-label { font-size: 10px; font-weight: 800; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin: 20px 10px 8px; }

.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 10px;
  color: var(--text-sub); text-decoration: none; font-size: 13.5px; font-weight: 600;
  margin-bottom: 4px; transition: var(--transition);
}
.nav-item:hover { background: #f8fafc; color: var(--accent); }
.nav-item.active { background: var(--accent-glow); color: var(--accent); font-weight: 700; }

/* Sidebar User */
.sidebar-user { padding: 16px 20px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 10px; }
.user-avatar { width: 34px; height: 34px; border-radius: 8px; }
.user-name { font-size: 13px; font-weight: 700; }
.btn-logout { font-size: 11px; color: var(--text-muted); border: none; background: none; cursor: pointer; }

/* ===== Dashboard Content ===== */
.main-header { margin-bottom: 24px; }
.page-title { font-size: 26px; font-weight: 800; letter-spacing: -0.8px; margin-bottom: 4px; }
.page-sub { color: var(--text-muted); font-size: 14px; }

.premium-card {
  background: white; border-radius: var(--radius); border: 1px solid var(--border);
  padding: 24px; box-shadow: var(--shadow-sm); transition: var(--transition);
  margin-bottom: 24px;
}
.premium-card:hover { border-color: var(--accent-light); }

.card-header { margin-bottom: 20px; display: flex; align-items: center; justify-content: space-between; }
.card-header h3 { font-size: 17px; font-weight: 800; color: var(--text); }
.card-desc { color: var(--text-muted); font-size: 13px; }

/* Selection Grid */
.premium-check-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 16px 0; }
.premium-check-item {
  background: #ffffff; border: 1px solid var(--border); padding: 14px 18px; border-radius: 10px;
  cursor: pointer; transition: var(--transition); display: flex; align-items: center; gap: 12px;
}
.premium-check-item:hover { border-color: var(--accent-light); box-shadow: var(--shadow-sm); }
.premium-check-item.active { background: #f5f3ff; border-color: var(--accent); }
.premium-check-item input { width: 18px; height: 18px; cursor: pointer; accent-color: var(--accent); }
.premium-check-item .label-text { font-size: 14px; font-weight: 600; color: var(--text); }

/* Launch Button */
.btn-launch {
  background: var(--accent); color: white;
  border: none; padding: 14px 32px; border-radius: 10px; font-size: 15px; font-weight: 700;
  cursor: pointer; display: flex; align-items: center; gap: 10px; transition: var(--transition);
  margin: 0 auto;
}
.btn-launch:hover { background: var(--accent-dark); transform: scale(1.02); }
.btn-launch.loading { background: #94a3b8; cursor: wait; }

/* Tabs */
.preview-tabs { display: flex; gap: 4px; background: #eaedef; padding: 4px; border-radius: 10px; width: fit-content; margin-bottom: 20px; }
.preview-tab {
  padding: 8px 18px; border-radius: 8px; border: none; background: transparent;
  color: var(--text-muted); font-size: 13px; font-weight: 700; cursor: pointer; transition: var(--transition);
}
.preview-tab.active { background: white; color: var(--accent); box-shadow: var(--shadow-sm); }

/* Frame container */
.preview-frame-container { border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); background: #ffffff; }
#ep-frame { width: 100%; height: 700px; border: none; display: block; }

/* Log Console */
.log-panel {
  background: #1e293b; border-radius: 10px; padding: 20px; color: #e2e8f0;
  font-family: 'JetBrains Mono', monospace; font-size: 12px; max-height: 300px; overflow-y: auto;
}
.log-line { margin-bottom: 4px; border-bottom: 1px solid rgba(255,255,255,0.03); padding-bottom: 4px; }
.log-step { color: #818cf8; font-weight: 700; margin: 8px 0 4px; padding-left: 0; display: block; border-left: 2px solid var(--accent); padding-left: 8px; }

/* Layout Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: white; padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.stat-value { font-size: 28px; font-weight: 800; color: var(--accent); margin-bottom: 2px; }
.stat-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; }

/* History List */
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item { 
  display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: #ffffff; 
  border: 1px solid var(--border); border-radius: 10px; transition: var(--transition); font-size: 13px;
}
.history-item:hover { border-color: var(--accent); background: #f8fafc; }
.history-cat { font-size: 10px; font-weight: 800; background: #f1f5f9; padding: 2px 8px; border-radius: 4px; }
.history-title { flex: 1; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Responsive */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 10px 0 30px rgba(0,0,0,0.1); }
  .main { margin-left: 0; width: 100%; padding: 20px; }
}

/* Category Grid */
.category-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.category-item { background: white; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; gap: 16px; }

/* Footer */
.main-footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); text-align: center; color: var(--text-muted); font-size: 12px; }

/* Extra Utilities */
.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 6px; border: 1px solid var(--border); background: white; cursor: pointer; }
.btn-sm:hover { border-color: var(--accent); color: var(--accent); }

/* Toggle Switch Styles */
.toggle-label {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-switch {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #cbd5e1;
  transition: .3s;
  border-radius: 24px;
}

.toggle-switch:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.toggle-input:checked + .toggle-switch {
  background-color: var(--accent);
}

.toggle-input:checked + .toggle-switch:before {
  transform: translateX(20px);
}

.toggle-input:focus + .toggle-switch {
  box-shadow: 0 0 1px var(--accent);
}

/* Subscriber Table-like List */
.subscriber-container {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.subscriber-header {
  display: grid;
  grid-template-columns: 80px 150px 1fr 180px;
  padding: 12px 20px;
  background: #f8fafc;
  border-bottom: 2px solid var(--border);
  font-size: 12px;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.subscriber-row {
  display: grid;
  grid-template-columns: 80px 150px 1fr 180px;
  padding: 14px 20px;
  align-items: center;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
  font-size: 14px;
}

.subscriber-row:hover {
  background: #f1f5f9;
}

.col-name {
  font-weight: 700;
  color: var(--text);
}

.col-email {
  color: var(--text-sub);
  font-family: inherit;
}

.col-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.scale-sm {
  transform: scale(0.8);
  transform-origin: left;
}

.text-muted { color: var(--text-muted); }
.danger { color: var(--danger) !important; border-color: var(--danger) !important; }
.danger:hover { background: #fef2f2 !important; }