:root {
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Drafting Table Palette */
  --bg-color: #0e0e0e;
  --bg-card: #151515;
  --bg-sidebar: #0a0a0a;

  /* Amber Accents */
  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.2);
  --accent-soft: rgba(245, 158, 11, 0.1);

  /* Text */
  --text-main: #f0ece4;
  --text-muted: #7a7568;
  --text-dim: #524e45;

  /* Borders & Shadows */
  --border: rgba(255, 255, 255, 0.07);
  --border-accent: rgba(245, 158, 11, 0.4);
  --border-sketch: rgba(245, 158, 11, 0.5);
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lift: 0 4px 16px rgba(0, 0, 0, 0.4);

  /* Grid lines for graph paper */
  --grid-color: rgba(255, 255, 255, 0.03);
  --grid-color-strong: rgba(255, 255, 255, 0.05);

  /* Reduced radius for sketch feel */
  --radius-lg: 3px;
  --radius-md: 2px;
  --radius-sm: 2px;
  --radius-full: 3px;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 39px, var(--grid-color) 39px, var(--grid-color) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, var(--grid-color) 39px, var(--grid-color) 40px),
    repeating-linear-gradient(0deg, transparent, transparent 199px, var(--grid-color-strong) 199px, var(--grid-color-strong) 200px),
    repeating-linear-gradient(90deg, transparent, transparent 199px, var(--grid-color-strong) 199px, var(--grid-color-strong) 200px);
  background-size: 40px 40px, 40px 40px, 200px 200px, 200px 200px;
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: grid;
  grid-template-rows: 1fr;
  overflow: hidden;
}

#app {
  display: grid;
  width: 100%;
  height: 100vh;
}

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

input {
  font-family: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: white;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow), 2px 2px 0 var(--accent-soft);
}

/* Sketched Border Utilities */
.sketch-border {
  position: relative;
}

.sketch-border::before {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -2px;
  bottom: -2px;
  border: 2px solid var(--border-sketch);
  border-radius: var(--radius-sm);
  pointer-events: none;
  filter: url(#sketchy-strong);
  opacity: 0.5;
  transition: opacity 0.3s ease;
  transform: rotate(-0.5deg);
  box-shadow: 2px 1px 0 0px var(--border-sketch);
}

.sketch-border-double {
  position: relative;
}

.sketch-border-double::before,
.sketch-border-double::after {
  content: '';
  position: absolute;
  pointer-events: none;
}

.sketch-border-double::before {
  top: -4px;
  left: -6px;
  right: -2px;
  bottom: -5px;
  border: 2px solid var(--border-sketch);
  border-radius: 0;
  filter: url(#sketchy-strong);
  opacity: 0.5;
  transform: rotate(-0.6deg) skewX(-0.5deg);
  box-shadow: 1px 2px 0 0px var(--border-sketch);
}

.sketch-border-double::after {
  top: -8px;
  left: -3px;
  right: -8px;
  bottom: -4px;
  border: 1.8px solid var(--border-sketch);
  border-radius: 0;
  filter: url(#sketchy-strong);
  opacity: 0.3;
  transform: rotate(0.8deg) skewY(-0.3deg);
  box-shadow: -2px -1px 0 0px var(--border-sketch);
}

/* Custom Scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: rgba(245, 158, 11, 0.15) var(--bg-color);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 2px;
  border: 2px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

::-webkit-scrollbar-corner {
  background: var(--bg-color);
}