:root {
  --bg: #f4f1ec;
  --panel: #ffffff;
  --ink: #1f1d1a;
  --accent: #c44900;
  --accent-dark: #942f00;
  --muted: #6d665d;
  --border: #ded6cc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  color: var(--ink);
  background: linear-gradient(120deg, #f4f1ec 0%, #efe7dd 100%);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: #fff8ef;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  border-radius: 8px;
  letter-spacing: 1px;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.tools-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.tools-menu a {
  text-decoration: none;
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 14px;
}

.tools-menu a.active {
  color: var(--accent);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 2.2fr) minmax(320px, 1fr);
  gap: 24px;
  padding: 24px 32px 40px;
}

.viewer {
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 18px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.05);
}

.viewer-toolbar {
  display: flex;
  gap: 24px;
  align-items: center;
  margin-bottom: 16px;
}

.viewer-toolbar label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.muted {
  color: var(--muted);
}

.canvas-wrap {
  border: 1px dashed #cdbfb0;
  border-radius: 16px;
  padding: 16px;
  background: #fffdf8;
  overflow: auto;
  min-height: 420px;
}

#pdfCanvas {
  display: block;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  touch-action: none;
}

.hint {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-block {
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 18px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
}

.panel-block h2 {
  margin-top: 0;
  font-size: 16px;
}

.button-row {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 12px;
}

button.small {
  padding: 6px 14px;
  font-size: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

input,
select,
textarea,
button {
  font-family: inherit;
}

textarea,
input,
select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fffdf8;
}

button,
.file-button {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  cursor: pointer;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button.primary:hover,
.file-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(196, 73, 0, 0.25);
}

button.ghost {
  background: #f0e6da;
  color: var(--ink);
}

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

.file-button input {
  display: none;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 12px;
}

.checkbox.small {
  margin-bottom: 0;
  font-size: 12px;
}

.inline-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.patch-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.patch-item {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  background: #fff7ec;
}

.patch-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(196, 73, 0, 0.2);
}

.download a {
  display: inline-block;
  margin-top: 8px;
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.export-status {
  font-size: 13px;
  margin-top: 6px;
}

@media (max-width: 960px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
  }

  .topbar-left {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
  }

  .tools-menu {
    flex-wrap: wrap;
  }

  .topbar-actions {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .workspace {
    padding: 16px 18px 32px;
  }

  .viewer,
  .panel-block {
    padding: 16px;
    border-radius: 14px;
  }

  .viewer-toolbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .canvas-wrap {
    padding: 12px;
  }

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

  .button-row {
    width: 100%;
  }

  button,
  .file-button {
    width: 100%;
    text-align: center;
  }
}