/* ===== Deer9 Tools — Shared Styles ===== */

:root {
  --c-primary: #3b82f6;
  --c-primary-hover: #2563eb;
  --c-bg: #f1f5f9;
  --c-surface: #ffffff;
  --c-text: #0f172a;
  --c-text2: #64748b;
  --c-border: #e2e8f0;
  --c-border-focus: #93c5fd;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC",
    sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
}

/* ---- Top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar .back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--c-text2);
  font-size: 14px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}

.topbar .back:hover {
  background: var(--c-bg);
  color: var(--c-text);
}

.topbar h1 {
  font-size: 16px;
  font-weight: 600;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.15s;
}

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

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

.btn-secondary {
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-secondary:hover {
  background: var(--c-border);
}

/* ---- Editor layout (split pane) ---- */
.editor-wrap {
  display: flex;
  height: calc(100vh - 49px);
  overflow: hidden;
}

.editor-wrap .pane {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.editor-wrap .divider {
  width: 1px;
  background: var(--c-border);
  flex-shrink: 0;
}

.pane-header {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
}

.pane textarea {
  flex: 1;
  width: 100%;
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  background: var(--c-surface);
  color: var(--c-text);
  tab-size: 2;
}

.pane iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: #fff;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .editor-wrap {
    flex-direction: column;
  }

  .editor-wrap .divider {
    width: 100%;
    height: 1px;
  }

  .editor-wrap .pane {
    flex: 1;
    min-height: 0;
  }
}