@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');



*, *::before, *::after {

  box-sizing: border-box;

  margin: 0;

  padding: 0;

}



:root {

  --bg-root: #09090b;

  --bg-surface: #121214;

  --bg-elevated: #18181b;

  --bg-hover: #222228;

  --border: #27272a;

  --border-accent: #3b3b40;

  --text-primary: #fafafa;

  --text-secondary: #a1a1aa;

  --text-muted: #71717a;

  --accent: #6366f1;

  --accent-soft: #818cf8;

  --accent-glow: rgba(99, 102, 241, 0.15);

  --green: #22c55e;

  --green-bg: rgba(34, 197, 94, 0.10);

  --red: #ef4444;

  --red-bg: rgba(239, 68, 68, 0.10);

  --radius-sm: 8px;

  --radius: 12px;

  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);

  --shadow: 0 4px 16px rgba(0, 0, 0, 0.5);

  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);

  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);

}



body {

  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  background: var(--bg-root);

  color: var(--text-primary);

  min-height: 100vh;

  background-image:

    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(99, 102, 241, 0.08), transparent),

    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(99, 102, 241, 0.04), transparent);

  background-attachment: fixed;

}



/* ---------------------------------- Layout ---------------------------------- */

.app {

  max-width: 760px;

  margin: 0 auto;

  padding: 40px 20px 80px;

}



/* ---------------------------------- Header ---------------------------------- */

header {

  text-align: center;

  margin-bottom: 36px;

}



header h1 {

  font-size: 36px;

  font-weight: 700;

  letter-spacing: -1px;

  background: linear-gradient(135deg, #e0e7ff 0%, #818cf8 50%, #6366f1 100%);

  -webkit-background-clip: text;

  -webkit-text-fill-color: transparent;

  background-clip: text;

  margin-bottom: 6px;

}



header p {

  font-size: 14px;

  color: var(--text-muted);

  font-weight: 400;

  letter-spacing: 0.2px;

}



/* ---------------------------------- Toolbar ---------------------------------- */

.toolbar {

  display: flex;

  gap: 8px;

  align-items: center;

  margin-bottom: 20px;

  padding: 8px;

  background: var(--bg-surface);

  border: 1px solid var(--border);

  border-radius: var(--radius);

  box-shadow: var(--shadow-sm);

}



.toolbar select {

  flex: 1;

  min-width: 0;

  padding: 10px 14px;

  background: var(--bg-elevated);

  color: var(--text-primary);

  border: 1px solid transparent;

  border-radius: var(--radius-sm);

  font-size: 13px;

  font-weight: 500;

  font-family: inherit;

  cursor: pointer;

  appearance: none;

  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2371717a' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");

  background-position: right 10px center;

  background-repeat: no-repeat;

  background-size: 18px;

  padding-right: 36px;

  transition: all var(--transition);

}



.toolbar select:hover {

  border-color: var(--border-accent);

}



.toolbar select:focus {

  outline: none;

  border-color: var(--accent);

  box-shadow: 0 0 0 3px var(--accent-glow);

}



.toolbar button {

  padding: 10px 14px;

  background: var(--bg-elevated);

  color: var(--text-secondary);

  border: 1px solid var(--border);

  border-radius: var(--radius-sm);

  font-size: 12px;

  font-weight: 600;

  font-family: inherit;

  cursor: pointer;

  white-space: nowrap;

  transition: all var(--transition);

  display: flex;

  align-items: center;

  gap: 6px;

}



.toolbar button:hover {

  background: var(--bg-hover);

  color: var(--text-primary);

  border-color: var(--border-accent);

}



.toolbar button:active {

  transform: scale(0.97);

}



.toolbar button.danger {

  color: var(--red);

  border-color: transparent;

  background: var(--red-bg);

}



.toolbar button.danger:hover {

  background: var(--red);

  color: #fff;

  border-color: var(--red);

}



/* ---------------------------------- New Inbox Box ---------------------------------- */

.new-box {

  margin-bottom: 20px;

  padding: 20px;

  background: var(--bg-surface);

  border: 1px solid var(--border);

  border-radius: var(--radius);

  box-shadow: var(--shadow-sm);

  display: flex;

  gap: 10px;

  animation: slideDown 200ms cubic-bezier(0.4, 0, 0.2, 1);

}



.new-box.hidden {

  display: none;

}



@keyframes slideDown {

  from { opacity: 0; transform: translateY(-12px); }

  to   { opacity: 1; transform: translateY(0); }

}



.new-box input {

  flex: 1;

  padding: 12px 16px;

  background: var(--bg-root);

  color: var(--text-primary);

  border: 1px solid var(--border);

  border-radius: var(--radius-sm);

  font-size: 14px;

  font-family: inherit;

  font-weight: 500;

  transition: all var(--transition);

}



.new-box input::placeholder {

  color: var(--text-muted);

  font-weight: 400;

}



.new-box input:focus,

.new-box select:focus {

  outline: none;

  border-color: var(--accent);

  box-shadow: 0 0 0 3px var(--accent-glow);

}



.new-box select {

  padding: 12px 16px;

  background: var(--bg-root);

  color: var(--text-primary);

  border: 1px solid var(--border);

  border-radius: var(--radius-sm);

  font-size: 14px;

  font-family: inherit;

  font-weight: 500;

  cursor: pointer;

  min-width: 160px;

  transition: all var(--transition);

}



.new-box select:hover {

  border-color: var(--border-accent);

}



.new-box button {

  padding: 12px 20px;

  border-radius: var(--radius-sm);

  font-size: 13px;

  font-weight: 600;

  font-family: inherit;

  cursor: pointer;

  white-space: nowrap;

  transition: all var(--transition);

  border: 1px solid transparent;

}



.new-box button:active {

  transform: scale(0.97);

}



#createCustomBtn {

  background: var(--green);

  color: #000;

}



#createCustomBtn:hover {

  background: #16a34a;

  box-shadow: 0 0 20px rgba(34, 197, 94, 0.25);

}



#createRandomBtn {

  background: var(--accent);

  color: #fff;

}



#createRandomBtn:hover {

  background: var(--accent-soft);

  box-shadow: 0 0 20px var(--accent-glow);

}



/* ---------------------------------- Panel ---------------------------------- */

.panel {

  background: var(--bg-surface);

  border: 1px solid var(--border);

  border-radius: var(--radius);

  box-shadow: var(--shadow-sm);

  overflow: hidden;

}



.panel-head {

  display: flex;

  justify-content: space-between;

  align-items: center;

  padding: 16px 20px;

  border-bottom: 1px solid var(--border);

  background: var(--bg-elevated);

}



.panel-head h2 {

  font-size: 14px;

  font-weight: 600;

  color: var(--text-primary);

  word-break: break-all;

  letter-spacing: -0.2px;

}



.panel-head span {

  font-size: 11px;

  font-weight: 600;

  color: var(--text-muted);

  white-space: nowrap;

  margin-left: 12px;

  background: var(--bg-hover);

  padding: 4px 10px;

  border-radius: 20px;

  letter-spacing: 0.3px;

  text-transform: uppercase;

}



/* ---------------------------------- Message List ---------------------------------- */

.message-list {

  min-height: 260px;

}



.message-item {

  padding: 18px 20px;

  border-bottom: 1px solid var(--border);

  transition: background var(--transition);

  cursor: default;

}



.message-item:last-child {

  border-bottom: none;

}



.message-item:hover {

  background: var(--bg-hover);

}



.message-item .message-meta {

  font-size: 11px;

  font-weight: 600;

  color: var(--text-muted);

  margin-bottom: 8px;

  display: flex;

  align-items: center;

  gap: 6px;

  text-transform: uppercase;

  letter-spacing: 0.4px;

}



.message-item .message-meta::before {

  content: '';

  display: inline-block;

  width: 6px;

  height: 6px;

  border-radius: 50%;

  background: var(--accent);

}



.message-item strong {

  display: block;

  font-size: 14px;

  font-weight: 600;

  margin-bottom: 8px;

  color: var(--text-primary);

  letter-spacing: -0.2px;

}



.message-item p {

  font-size: 13px;

  color: var(--text-secondary);

  white-space: pre-wrap;

  line-height: 1.7;

}



/* ---------------------------------- Empty States ---------------------------------- */

.empty-state {

  display: flex;

  flex-direction: column;

  align-items: center;

  justify-content: center;

  padding: 60px 20px;

  text-align: center;

  color: var(--text-muted);

}



.empty-state .icon {

  font-size: 40px;

  margin-bottom: 16px;

  opacity: 0.4;

  filter: grayscale(1);

}



.empty-state .title {

  font-size: 15px;

  font-weight: 600;

  margin-bottom: 6px;

  color: var(--text-secondary);

}



.empty-state .sub {

  font-size: 13px;

  color: var(--text-muted);

  max-width: 300px;

  line-height: 1.6;

}



/* ---------------------------------- Footer ---------------------------------- */

footer {

  text-align: center;

  padding: 32px 0 20px;

  font-size: 12px;

  font-weight: 500;

  color: var(--text-muted);

}



footer a {

  color: var(--text-muted);

  text-decoration: none;

  transition: color var(--transition);

  letter-spacing: 0.2px;

}



footer a span {

  color: var(--accent-soft);

  font-weight: 600;

  transition: color var(--transition);

}



footer a:hover {

  color: var(--text-secondary);

}



footer a:hover span {

  color: var(--accent);

}



/* ---------------------------------- Toast ---------------------------------- */

.toast-container {

  position: fixed;

  bottom: 24px;

  right: 24px;

  z-index: 9999;

  display: flex;

  flex-direction: column;

  gap: 8px;

}



.toast {

  padding: 12px 20px;

  background: var(--bg-elevated);

  border: 1px solid var(--border);

  border-radius: var(--radius-sm);

  font-size: 13px;

  font-weight: 500;

  color: var(--text-primary);

  box-shadow: var(--shadow-lg);

  animation: toastIn 300ms cubic-bezier(0.4, 0, 0.2, 1);

  pointer-events: all;

}



.toast.fadeout {

  animation: toastOut 200ms cubic-bezier(0.4, 0, 0.2, 1) forwards;

}



@keyframes toastIn {

  from { opacity: 0; transform: translateY(20px) scale(0.95); }

  to   { opacity: 1; transform: translateY(0) scale(1); }

}



@keyframes toastOut {

  to { opacity: 0; transform: translateY(10px) scale(0.96); }

}



/* ---------------------------------- Responsive ---------------------------------- */

@media (max-width: 560px) {

  .app {

    padding: 20px 12px 60px;

  }



  header h1 {

    font-size: 28px;

  }



  .toolbar {

    flex-wrap: wrap;

    gap: 6px;

    padding: 6px;

  }



  .toolbar select {

    width: 100%;

    flex: none;

  }



  .toolbar button {

    padding: 8px 10px;

    font-size: 11px;

  }



  .new-box {

    flex-direction: column;

    padding: 14px;

  }



  .panel-head {

    padding: 12px 14px;

  }



  .message-item {

    padding: 14px 14px;

  }

}