:root {
  --retro-white: #fafafa;
  --retro-cream: #f5f3ef;
  --retro-black: #1a1a1a;
  --retro-gray-dark: #3a3a3a;
  --retro-gray-mid: #6b6b6b;
  --retro-gray-light: #a0a0a0;
  --retro-border: #2a2a2a;
  --retro-accent: #e74c3c;
  --border-width: 2px;
  --topbar-height: 160px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  color: var(--retro-black);
  background-color: var(--retro-white);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--retro-white);
  border-bottom: var(--border-width) solid var(--retro-border);
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand-title {
  margin: 0;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-align: left;
  line-height: 1.05;
  color: var(--retro-black);
  min-width: 200px;
}

.mailbox-tools {
  width: 100%;
  display: grid;
  gap: 8px;
}

.mailbox-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.mailbox-label {
  color: var(--retro-gray-mid);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  min-width: 58px;
}

#mailboxInput {
  flex: 1;
  min-width: 200px;
  padding: 10px 11px;
  border: var(--border-width) solid var(--retro-border);
  background: var(--retro-white);
  color: var(--retro-black);
  font-size: 14px;
}

#mailboxInput[readonly] {
  color: var(--retro-gray-dark);
  background: #f7f7f7;
}

#mailboxInput::placeholder {
  color: var(--retro-gray-light);
}

#mailboxInput:focus {
  outline: none;
  border-color: var(--retro-black);
  box-shadow: 0 0 0 2px rgba(26, 26, 26, 0.12);
}

.editor-actions,
.quick-actions {
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border: var(--border-width) solid #cccccc;
  background: transparent;
  color: var(--retro-gray-mid);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  border-color: var(--retro-black);
  color: var(--retro-black);
  background: #f3f3f3;
}

.mailbox-address {
  color: var(--retro-gray-mid);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  word-break: break-all;
}

.mailbox-address span {
  color: var(--retro-black);
  font-weight: 700;
  text-transform: none;
}

.main {
  min-height: 100vh;
  padding-top: calc(var(--topbar-height, 160px) + 24px);
  padding-bottom: 20px;
  background-image: radial-gradient(var(--retro-gray-light) 0.8px, transparent 0.8px);
  background-size: 22px 22px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.card {
  background: var(--retro-white);
  border: var(--border-width) solid var(--retro-border);
  padding: 14px;
  margin-bottom: 14px;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--retro-gray-light);
}

.card-head h3 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card-head span {
  color: var(--retro-gray-mid);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.message-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.message-actions .tab-btn {
  padding: 6px 10px;
  letter-spacing: 0.06em;
}

.table-wrap {
  max-height: 430px;
  overflow: auto;
}

#mailTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

#mailTable th,
#mailTable td {
  border: 1px solid #dddddd;
  padding: 10px 8px;
  text-align: left;
}

#mailTable th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--retro-cream);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

#mailTable tbody tr {
  transition: background-color 0.2s ease;
}

#mailTable tbody tr:hover {
  background: #f2f2f2;
  cursor: pointer;
}

#mailTable tbody tr.active {
  background: #e8e8e8;
}

.content-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.tab-btn {
  border: var(--border-width) solid #d6d6d6;
  background: var(--retro-white);
  color: var(--retro-gray-mid);
  padding: 7px 11px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.active {
  border-color: var(--retro-black);
  background: var(--retro-black);
  color: var(--retro-white);
}

.content-view {
  border: var(--border-width) solid var(--retro-border);
  background: var(--retro-white);
}

.view-block {
  margin: 0;
  min-height: 300px;
  max-height: 430px;
  overflow: auto;
  padding: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 14px;
  color: var(--retro-black);
}

#htmlView {
  width: 100%;
  border: 0;
}

#jsonView {
  font-family: "Courier New", monospace;
  font-size: 12px;
}

.api-card h4 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.api-card code {
  display: block;
  margin-bottom: 8px;
  padding: 8px;
  border: 1px dashed var(--retro-gray-light);
  background: var(--retro-cream);
  font-family: "Courier New", monospace;
  font-size: 12px;
  color: var(--retro-gray-dark);
  white-space: pre-wrap;
  word-break: break-all;
}

.status-bar {
  min-height: 20px;
  color: var(--retro-gray-mid);
  font-size: 12px;
}

.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand-title {
    font-size: 28px;
    text-align: left;
    min-width: 0;
  }

  .mailbox-tools {
    width: 100%;
  }
}

@media (max-width: 620px) {
  .mailbox-toolbar {
    align-items: stretch;
  }

  .mailbox-label {
    min-width: 0;
  }

  #mailboxInput {
    min-width: 0;
  }

  .view-block {
    min-height: 240px;
    max-height: 320px;
  }
}