:root {
  --primary: #6366f1;
  --primary-light: #eef2ff;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e5e7eb;
  --danger: #ef4444;
}

* {
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

/* ===== APP LAYOUT ===== */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

.sidebar input {
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.sidebar button {
  margin-top: 10px;
  padding: 10px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

.generate {
  background: var(--primary);
  color: white;
}

.clear {
  background: var(--danger);
  color: white;
}

.email-box {
  background: var(--primary-light);
  margin-top: 15px;
  padding: 10px;
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
  word-break: break-all;
}

.main {
  display: grid;
  grid-template-rows: 60px 1fr;
}

.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  display: flex;
  align-items: center;
  font-weight: 600;
}

.content {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 20px;
  padding: 20px;
}

.inbox {
  background: var(--card);
  border-radius: 12px;
  overflow-y: auto;
  border: 1px solid var(--border);
}

.inbox-item {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.2s;
}

.inbox-item:hover {
  background: var(--primary-light);
}

.inbox-item.active {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
}

.inbox-item small {
  color: var(--muted);
}

.message {
  background: var(--card);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.message-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-bottom: 10px;
}

.message-body {
  overflow-y: auto;
  font-size: 14px;
}

.empty {
  color: var(--muted);
  text-align: center;
  margin-top: 50px;
}