:root {
  --bg: #e8edf4;
  --surface: #ffffff;
  --surface-alt: #f7f9fc;
  --line: #c5d0de;
  --ink: #17212e;
  --muted: #5b6777;
  --primary: #1d4f8f;
  --primary-strong: #123968;
  --accent: #d89d26;
  --danger: #b03a2e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 10%, #f8fbff 0, #e6ecf4 45%, #dde5f0 100%);
  min-height: 100vh;
}

.app-header,
.layout,
.app-footer {
  width: min(1400px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.app-header {
  padding: 1.5rem 0 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}

.kicker {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}

h1 {
  margin: 0.45rem 0 0;
  max-width: 58ch;
  font-size: clamp(1.35rem, 1.9vw, 1.95rem);
  line-height: 1.3;
}

h2,
h3 {
  margin: 0;
}

.header-actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.layout {
  display: grid;
  grid-template-columns: minmax(330px, 390px) 1fr;
  gap: 1rem;
  align-items: start;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(31, 50, 77, 0.08);
}

.controls-card {
  padding: 1rem;
  position: sticky;
  top: 0.75rem;
}

.drop-zone {
  margin-top: 0.85rem;
  min-height: 100px;
  border: 2px dashed #7e94ad;
  border-radius: 12px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  padding: 1rem;
  background: linear-gradient(160deg, #fbfdff 0%, #eef3f8 100%);
}

.drop-zone.dragover {
  border-color: var(--primary);
  color: var(--primary);
  background: #edf4fe;
}

.message-banner {
  margin-top: 0.85rem;
  font-size: 0.92rem;
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-alt);
}

.message-banner.error {
  color: var(--danger);
  border-color: #e9b4ae;
  background: #fff4f2;
}

.unsupported-panel {
  margin-top: 0.75rem;
  border: 1px solid #efdfbb;
  background: #fff8e8;
  padding: 0.7rem;
  border-radius: 10px;
  font-size: 0.88rem;
}

.unsupported-panel ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
}

.form-grid {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
}

input,
select,
textarea,
.btn {
  width: 100%;
  margin-top: 0.32rem;
  border: 1px solid #a9b9cc;
  border-radius: 9px;
  padding: 0.58rem 0.62rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

textarea {
  resize: vertical;
  min-height: 90px;
}

.button-group {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.btn {
  cursor: pointer;
  font-weight: 600;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-strong);
}

.btn-primary:hover {
  background: var(--primary-strong);
}

.btn-secondary {
  background: #f4f7fb;
}

.btn-secondary:hover {
  background: #e9eff8;
}

.btn-ghost {
  background: #fdfcf7;
  border-color: #d8c8a0;
}

.preview-card {
  padding: 1rem;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.preview-head p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.preview-grid {
  margin-top: 0.75rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.preview-pane {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem;
  background: var(--surface-alt);
  min-height: 540px;
}

.preview-pane h3 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.preview-box {
  min-height: 490px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  overflow: auto;
  display: grid;
  place-items: center;
  padding: 0.65rem;
}

.preview-box.empty {
  color: var(--muted);
  text-align: center;
}

.preview-box svg {
  width: 100%;
  height: auto;
}

.app-footer {
  padding: 0.8rem 0 1.35rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls-card {
    position: static;
  }

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

  .preview-pane {
    min-height: 460px;
  }

  .preview-box {
    min-height: 410px;
  }
}

@media (max-width: 720px) {
  .app-header,
  .layout,
  .app-footer {
    width: min(1400px, calc(100% - 1.1rem));
  }

  .form-grid,
  .button-group {
    grid-template-columns: 1fr;
  }

  .app-footer {
    flex-direction: column;
    gap: 0.25rem;
  }
}

@media print {
  body {
    background: #fff !important;
  }

  .app-header,
  .controls-card,
  .app-footer,
  .preview-pane:first-child,
  .preview-pane h3,
  .preview-head {
    display: none !important;
  }

  .layout,
  .preview-card,
  .preview-grid,
  .preview-pane,
  .preview-box {
    display: block !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
    box-shadow: none !important;
    min-height: auto !important;
    background: #fff !important;
  }

  .printable-area,
  .printable-area .preview-box,
  .printable-area svg {
    page-break-inside: avoid;
  }
}