/* Reset + design tokens */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji";
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  overscroll-behavior-y: contain;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  border: 0;
  background: none;
  cursor: pointer;
  touch-action: manipulation;
}

a { color: var(--green-600); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { margin: 0; padding: 0; list-style: none; }

img, svg { display: block; max-width: 100%; }

:root {
  /* Green palette (emerald) */
  --green-50:  #ecfdf5;
  --green-100: #d1fae5;
  --green-200: #a7f3d0;
  --green-300: #6ee7b7;
  --green-400: #34d399;
  --green-500: #10b981;
  --green-600: #059669;
  --green-700: #047857;
  --green-800: #065f46;

  /* Neutrals */
  --bg: #ffffff;
  --surface: #f8fafb;
  --surface-2: #f1f5f4;
  --border: #e5e7eb;
  --text: #0f172a;
  --muted: #64748b;
  --danger: #dc2626;

  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow: 0 6px 18px rgba(16, 185, 129, .12);
  --shadow-lg: 0 12px 32px rgba(16, 185, 129, .18);

  --tap: 44px;
  --header-h: 56px;
  --tabbar-h: 64px;

  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111827;
    --surface-2: #1f2937;
    --border: #273142;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --shadow: 0 6px 18px rgba(0, 0, 0, .35);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, .5);
  }
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--green-500);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Scrollbar (subtle) */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 8px; }