:root {
  --bg: #f0f7f3;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --text-secondary: #6c757d;
  --border: #d4e4da;
  --accent: #2d8a4e;
  --accent-hover: #236b3d;
  --accent-light: #e8f5e9;
  --error: #dc3545;
  --error-bg: #fbe9e7;
  --success: #28a745;
  --success-bg: #e8f5e9;
  --shadow: 0 1px 3px rgba(0,0,0,0.05);
  --radius: 6px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --mono: "SF Mono", "Cascadia Code", "Consolas", "Courier New", monospace;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f1923;
  --card-bg: #1a2836;
  --text: #e0e0e0;
  --text-secondary: #9ca3af;
  --border: #2a3a4a;
  --accent: #4caf50;
  --accent-hover: #66bb6a;
  --accent-light: #1b3a2a;
  --error: #ef5350;
  --error-bg: #2d1b1b;
  --success: #66bb6a;
  --success-bg: #1b3a2a;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
html { font-size: 15px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background var(--transition), color var(--transition);
}

/* ─── Container ─── */
.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 6px 10px;
}

/* ─── Header ─── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}
.header h1 { font-size: 1.1rem; font-weight: 700; color: var(--accent); }
.theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 3px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.75rem;
  transition: background var(--transition), border-color var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); background: var(--accent-light); }

/* ─── Toolbar ─── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 5px 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 5px 0;
  flex-wrap: wrap;
  flex-shrink: 0;
  box-shadow: var(--shadow);
  transition: background var(--transition), border-color var(--transition);
}
.toolbar-checkbox {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 0.8rem;
  cursor: pointer;
  user-select: none;
}
.toolbar-checkbox input[type="checkbox"] { width: 13px; height: 13px; accent-color: var(--accent); cursor: pointer; }
.toolbar-group { display: flex; align-items: center; gap: 4px; font-size: 0.8rem; }
.toolbar-group select {
  padding: 2px 5px; border: 1px solid var(--border); border-radius: 3px;
  background: var(--card-bg); color: var(--text); font-size: 0.8rem; cursor: pointer;
}
.toolbar-sep { width: 1px; height: 16px; background: var(--border); flex-shrink: 0; }

/* ─── Sections ─── */
.section { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.divider { height: 4px; flex-shrink: 0; }

/* Section header */
.section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 10px;
  border-radius: var(--radius) var(--radius) 0 0;
  flex-shrink: 0;
  font-size: 0.78rem;
}
.geo-header { background: var(--accent-light); color: var(--accent); }
.proj-header { background: #e3f0e8; color: var(--accent); }
[data-theme="dark"] .proj-header { background: #162830; }
.section-title { font-weight: 600; }
.section-status { font-weight: 400; font-size: 0.75rem; opacity: 0.8; }

/* ─── Grids ─── */
.main-grid {
  flex: 1;
  display: grid;
  gap: 6px;
  min-height: 0;
  padding: 5px 0 4px;
}
.cols-5 { grid-template-columns: 1fr 1fr 1fr 1fr 1fr; }
.cols-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

.grid-col {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
  min-height: 0;
}

/* ─── Column Header ─── */
.col-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 7px;
  border-bottom: 1px solid var(--border);
  background: var(--accent-light);
  flex-shrink: 0;
}
.col-header .col-title { font-size: 0.8rem; font-weight: 600; color: var(--accent); white-space: nowrap; }

/* Input column accent — must come after .col-header to override */
.col-input { border-color: var(--accent); }
.col-input .col-header { background: var(--accent); }
.col-input .col-title { color: #fff; }
.col-input .pc label { color: rgba(255,255,255,0.85); }
.col-input .pi { color: #fff; background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.3); }
.fmt-label { font-size: 0.7rem; color: rgba(255,255,255,0.75); margin-left: auto; }
.fmt-value { font-size: 0.7rem; font-weight: 600; color: #fff; }

/* Precision control in header */
.pc { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.pc label { font-size: 0.7rem; color: var(--text-secondary); display: flex; align-items: center; gap: 2px; }
.pi {
  width: 40px; padding: 1px 3px; border: 1px solid var(--border); border-radius: 3px;
  background: var(--card-bg); color: var(--text); font-size: 0.75rem; text-align: center;
  font-family: var(--mono); transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.pi:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-light); }

/* ─── Copy button ─── */
.copy-btn {
  padding: 1px 7px; border: 1px solid var(--border); border-radius: 3px;
  background: var(--card-bg); color: var(--text-secondary); font-size: 0.7rem;
  cursor: pointer; white-space: nowrap; flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.copy-btn.copied { background: var(--success-bg); color: var(--success); border-color: var(--success); }

/* ─── Textareas ─── */
.area-input, .area-output {
  flex: 1; width: 100%; min-height: 0; padding: 6px 8px;
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.4;
  border: none; background: var(--card-bg); color: var(--text);
  resize: none; transition: background var(--transition), color var(--transition);
}
.area-input:focus, .area-output:focus { outline: none; background: var(--accent-light); }

/* ─── Footer ─── */
.footer { text-align: center; padding: 4px 0 2px; font-size: 0.7rem; color: var(--text-secondary); flex-shrink: 0; }

/* ─── Responsive ─── */
@media (max-width: 1000px) {
  .cols-5 { grid-template-columns: 1fr 1fr 1fr; }
  .cols-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .cols-5 { grid-template-columns: 1fr 1fr; }
  .cols-4 { grid-template-columns: 1fr; }
  .toolbar { flex-direction: column; align-items: stretch; gap: 5px; }
  html, body { overflow: auto; }
  .container { height: auto; min-height: 100vh; }
}