/* ============================================
   makepiechart.com — Styles
   Utility-first. Zero friction. Ship fast.
   ============================================ */

/* --- Fonts --- */
/* Google Fonts now loaded via optimized preconnect + link in HTML */

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

/* --- Theme Variables --- */
:root {
  /* Dark theme (default) */
  --bg-primary: #0e0f11;
  --bg-secondary: #16171b;
  --bg-tertiary: #1e1f25;
  --bg-input: #1a1b21;
  --bg-hover: #25262e;
  --border: #2a2b35;
  --border-focus: #f59e0b;
  --text-primary: #e8e8ec;
  --text-secondary: #9294a0;
  --text-muted: #5c5e6a;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --accent-muted: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-hover: #f87171;
  --success: #22c55e;
  --chart-bg: #16171b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'DM Mono', 'Menlo', monospace;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f5f5f0;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eeeee9;
  --bg-input: #ffffff;
  --bg-hover: #f0f0eb;
  --border: #d8d8d0;
  --border-focus: #d97706;
  --text-primary: #1a1a1a;
  --text-secondary: #5c5c5c;
  --text-muted: #999999;
  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-muted: rgba(217, 119, 6, 0.1);
  --danger: #dc2626;
  --danger-hover: #ef4444;
  --success: #16a34a;
  --chart-bg: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
}

/* --- Base --- */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Utility --- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.logo-text {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 6px 14px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Theme Toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-muted);
}

.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }

[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* Mobile menu */
.nav-hamburger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
}

/* --- Main App Layout --- */
.app-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px;
}

.app-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 24px;
  align-items: start;
}

/* --- Panel (Left: Controls) --- */
.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.panel-title {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.panel-body {
  padding: 16px 20px 20px;
}

/* --- Data Rows --- */
.data-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.data-row {
  display: grid;
  grid-template-columns: 14px 1fr 90px 34px 34px;
  gap: 8px;
  align-items: center;
  animation: rowIn 0.2s ease-out;
}

@keyframes rowIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.color-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.color-dot:hover {
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--border);
}

.color-dot input[type="color"] {
  position: absolute;
  inset: -8px;
  width: calc(100% + 16px);
  height: calc(100% + 16px);
  border: none;
  cursor: pointer;
  opacity: 0;
}

.data-row input[type="text"],
.data-row input[type="number"] {
  width: 100%;
  height: 36px;
  padding: 0 10px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.data-row input[type="number"] {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-align: right;
  -moz-appearance: textfield;
}

.data-row input[type="number"]::-webkit-inner-spin-button,
.data-row input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.data-row input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.data-row input::placeholder {
  color: var(--text-muted);
}

.btn-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.btn-icon:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
  border-color: var(--border);
}

.btn-icon.drag-handle {
  cursor: grab;
}

.btn-icon.drag-handle:active {
  cursor: grabbing;
}

.btn-icon.btn-delete:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.2);
}

.btn-icon svg { width: 16px; height: 16px; pointer-events: none; }

/* Add Row */
.add-row-area {
  margin-top: 12px;
}

.btn-add-row {
  width: 100%;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-add-row:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-muted);
}

.btn-add-row svg { width: 14px; height: 14px; }

/* --- Settings Panel --- */
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.setting-group.full-width {
  grid-column: 1 / -1;
}

.setting-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}

.setting-input,
.setting-select {
  height: 36px;
  padding: 0 10px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
}

.setting-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%235c5e6a' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
  cursor: pointer;
}

.setting-input:focus,
.setting-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

/* Toggle Switch */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 11px;
  cursor: pointer;
  transition: all var(--transition);
}

.toggle-slider::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent-muted);
  border-color: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::after {
  transform: translateX(18px);
  background: var(--accent);
}

/* --- Preview Area (Right) --- */
.preview-area {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chart-canvas {
  background: var(--chart-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 460px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.chart-canvas svg {
  max-width: 100%;
  max-height: 100%;
}

.chart-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.chart-empty svg {
  width: 48px;
  height: 48px;
  opacity: 0.3;
}

/* --- Export Bar --- */
.export-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  min-height: 40px; /* Prevent layout shift */
}

.btn-export {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 40px;
  min-width: 80px; /* Prevent width shift when font loads */
  padding: 0 16px;
  font-family: var(--font-mono), monospace; /* Fallback font */
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--border);
  text-decoration: none;
}

.btn-export svg { width: 16px; height: 16px; }

.btn-export-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.btn-export-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 16px var(--accent-muted);
}

.btn-export-secondary {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.btn-export-secondary:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.btn-share {
  margin-left: auto;
}

/* Export feedback toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 10px 20px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.toast-success { border-color: var(--success); }

/* --- Legend (in chart) --- */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* --- SEO Content Section --- */
.seo-content {
  max-width: 1320px;
  margin: 0 auto;
  padding: 64px 24px 80px;
}

.seo-content h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.seo-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 16px;
}

.seo-content h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-top: 32px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

/* Feature grid in SEO area */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition);
}

.feature-card:hover {
  border-color: var(--text-muted);
}

.feature-card h4 {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
  max-width: none;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}

.footer-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 960px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

  .preview-area {
    position: static;
    order: -1;
  }

  .chart-canvas {
    min-height: 340px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 8px;
    gap: 2px;
  }

  .nav-links.open { display: flex; }

  .nav-hamburger { display: flex; }

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

@media (max-width: 600px) {
  .app-container { padding: 16px; }
  .nav-inner { padding: 0 16px; }

  .data-row {
    grid-template-columns: 14px 1fr 70px 28px 28px;
    gap: 6px;
  }

  .export-bar {
    flex-direction: column;
  }

  .btn-export { width: 100%; justify-content: center; }
  .btn-share { margin-left: 0; }

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

/* --- Print --- */
@media print {
  .site-header, .panel, .export-bar, .seo-content, .site-footer { display: none; }
  .chart-canvas { border: none; box-shadow: none; }
}

/* --- Drag over styling --- */
.data-row.dragging {
  opacity: 0.4;
}

.data-row.drag-over {
  border-top: 2px solid var(--accent);
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.chart-canvas svg {
  animation: fadeIn 0.3s ease;
}

/* Slice hover effect handled via JS on SVG */