:root {
  --bg-main: #0d1120;
  --bg-panel: rgba(18, 24, 44, 0.8);
  --bg-panel-strong: rgba(25, 32, 57, 0.95);
  --text: #eef2ff;
  --muted: #a4afcf;
  --primary: #7c5cff;
  --primary-2: #5ae3ff;
  --primary-dark: #6345e6;
  --danger: #ff6d8a;
  --border: rgba(153, 171, 221, 0.24);
  --border-strong: rgba(153, 171, 221, 0.4);
  --shadow: 0 16px 40px rgba(3, 8, 24, 0.45);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #1b2350 0%, #0d1120 45%, #090d1b 100%);
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(124, 92, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 92, 255, 0.08) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.25;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 28px auto;
  padding: 0 16px 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.app-header {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  background: linear-gradient(145deg, rgba(53, 74, 154, 0.35), rgba(24, 30, 56, 0.8));
}

.eyebrow {
  display: inline-block;
  margin: 0 0 8px;
  color: #c6d0f4;
  font-size: 0.78rem;
  border: 1px solid rgba(198, 208, 244, 0.35);
  border-radius: 999px;
  padding: 4px 10px;
}

h1,
h2,
h3 {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
}

h2 {
  margin-bottom: 8px;
}

.subtitle,
.section-subtitle {
  color: var(--muted);
  margin: 0;
}

.header-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  color: #dbedff;
  border: 1px solid rgba(164, 175, 207, 0.4);
  background: rgba(30, 40, 75, 0.65);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.8rem;
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.86rem;
  font-weight: 650;
  color: #cfdaff;
}

textarea,
select,
input {
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(17, 22, 44, 0.82);
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  font: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

textarea::placeholder,
input::placeholder {
  color: #8f9abe;
}

textarea:focus,
select:focus,
input:focus {
  outline: none;
  border-color: var(--border-strong);
  box-shadow: 0 0 0 4px rgba(124, 92, 255, 0.2);
  background: rgba(20, 27, 52, 0.92);
}

textarea {
  resize: vertical;
}

.field-foot {
  display: flex;
  justify-content: space-between;
  margin: 7px 2px 14px;
  color: var(--muted);
  gap: 8px;
}

.hint {
  text-align: right;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

button {
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--primary), #8f74ff);
  color: #ffffff;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.16s ease, filter 0.2s ease, opacity 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

#regenerate-btn,
.ghost-btn {
  background: rgba(28, 36, 64, 0.8);
  border-color: rgba(155, 173, 228, 0.35);
  color: #d5e2ff;
}

.status {
  color: var(--muted);
  padding: 10px 12px;
  border: 1px dashed rgba(155, 173, 228, 0.35);
  border-radius: 10px;
  margin-bottom: 10px;
  background: rgba(15, 20, 39, 0.45);
}

.result {
  border: 1px solid rgba(155, 173, 228, 0.22);
  border-radius: 12px;
  padding: 12px;
  background: var(--bg-panel-strong);
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}

.copy-btn {
  background: rgba(42, 76, 155, 0.65);
  color: #dff1ff;
  border: 1px solid rgba(123, 197, 255, 0.5);
  font-weight: 600;
}

#subject-output {
  font-weight: 700;
  line-height: 1.45;
}

#body-output {
  white-space: pre-wrap;
  margin-top: 8px;
  background: rgba(12, 17, 35, 0.86);
  border: 1px solid rgba(156, 177, 235, 0.26);
  border-radius: 10px;
  padding: 12px;
  color: #dde7ff;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.history-item {
  border: 1px solid rgba(156, 177, 235, 0.18);
  border-radius: 10px;
  padding: 8px 10px;
  margin-top: 8px;
  background: rgba(14, 20, 40, 0.55);
}

.history-item button {
  width: 100%;
  text-align: left;
  background: transparent;
  color: #e7eeff;
  border: 0;
  padding: 4px 0;
  font-weight: 400;
}

.history-item button:hover {
  color: #a6d8ff;
}

.history-empty {
  color: var(--muted);
  margin-top: 8px;
}

.error {
  color: #ffc2cf;
  background: rgba(255, 109, 138, 0.14);
  border: 1px solid rgba(255, 109, 138, 0.35);
  border-radius: 8px;
  padding: 8px 10px;
  margin: 0;
}

.hidden {
  display: none;
}

@media (min-width: 860px) {
  .app {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }

  .app-header {
    grid-column: 1 / -1;
  }

  .history-panel {
    grid-column: 1 / -1;
  }

  .grid {
    grid-template-columns: 1fr 1fr;
  }
}