:root {
  --bg: #0a0a0f;
  --card: #14141c;
  --card-2: #1c1c28;
  --border: #2a2a38;
  --text: #e4e4ed;
  --text-dim: #8a8a99;
  --primary: #6366f1;
  --primary-2: #06b6d4;
  --danger: #ef4444;
  --success: #10b981;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

.bg-glow {
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(99,102,241,0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(6,182,212,0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.logo h1 {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
header p { color: var(--text-dim); font-size: 14px; }

.inbox-card, .panel, .new-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 16px;
}

.inbox-label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.inbox-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
#inboxSelect {
  flex: 1;
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  cursor: pointer;
}
#inboxSelect:focus { border-color: var(--primary); }

.inbox-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-2);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border: none;
}
.btn-secondary { background: var(--card-2); }
.btn-danger { color: var(--danger); border-color: rgba(239,68,68,0.3); }
.btn-danger:hover { background: rgba(239,68,68,0.1); }
.btn-icon { padding: 10px 12px; }

.new-box-inner { display: flex; gap: 8px; flex-wrap: wrap; }
#localPartInput {
  flex: 1;
  min-width: 200px;
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 10px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
}
#localPartInput:focus { border-color: var(--primary); }

.hidden { display: none !important; }

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.panel-head h2 {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}
.badge {
  background: var(--card-2);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}

.message-list { display: flex; flex-direction: column; gap: 12px; }
.message-item {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.message-item:hover { border-color: var(--primary); }
.message-meta { font-size: 12px; color: var(--text-dim); margin-bottom: 6px; }
.message-item strong { display: block; margin-bottom: 8px; font-size: 15px; }
.message-body {
  font-size: 14px;
  color: var(--text-dim);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, margin-top 0.3s ease;
}
.message-item.open .message-body {
  max-height: 800px;
  margin-top: 12px;
  overflow: auto;
}
.message-body p { margin-bottom: 8px; word-break: break-word; }
.message-body a { color: var(--primary-2); }
.message-body img { max-width: 100%; height: auto; border-radius: 6px; }

.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-dim);
}
.empty-state svg { margin-bottom: 12px; opacity: 0.5; }

.foot {
  text-align: center;
  margin-top: 24px;
  font-size: 12px;
  color: var(--text-dim);
}

@media (max-width: 600px) {
  .app { padding: 24px 16px; }
  .logo h1 { font-size: 24px; }
  .inbox-actions .btn-text { display: none; }
}