/* style.css */
@layer base, components, utilities;

@layer base {
  /* Default to light theme */
  :root {
    --brand-hue: 280;
    --bg-hue: 270;

    /* Light Theme Palette */
    --bg-color: oklch(98% 0.01 var(--bg-hue));
    --text-color: oklch(20% 0.05 var(--bg-hue));
    --accent-color: oklch(75% 0.25 var(--brand-hue));
    --accent-color-dark: oklch(65% 0.25 var(--brand-hue));
    --shadow-color: oklch(from var(--accent-color) l c h / 0.4);

    --font-family: 'Inter', sans-serif;
    --font-size-base: 16px;
    --font-size-lg: 1.5rem;
    --font-size-xl: 3rem;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
  }

  /* Dark Theme Palette */
  [data-theme='dark'] {
    --bg-color: oklch(20% 0.05 var(--bg-hue));
    --text-color: oklch(95% 0.05 var(--bg-hue));
    --shadow-color: oklch(from var(--accent-color) l c h / 0.5);
  }

  /* Auto-detect dark mode */
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme='light']) {
        --bg-color: oklch(20% 0.05 var(--bg-hue));
        --text-color: oklch(95% 0.05 var(--bg-hue));
        --shadow-color: oklch(from var(--accent-color) l c h / 0.5);
    }
  }


  @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700&family=Noto+Sans+KR:wght@400;700&display=swap');

  body {
    font-family: 'Noto Sans KR', var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: var(--spacing-md);
    display: grid;
    place-content: center;
    min-height: 100vh;
    text-align: center;
    background-image: radial-gradient(circle, oklch(from var(--text-color) l c h / 0.1) 1px, transparent 1px);
    background-size: 10px 10px;
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  h1 {
    font-size: var(--font-size-xl);
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color), 0 0 20px var(--shadow-color);
    margin-block-end: var(--spacing-xs);
  }

  p {
    font-size: var(--font-size-lg);
    margin-block-start: 0;
    opacity: 0.8;
  }
}

@layer components {
  header {
    position: relative;
    width: 100%;
  }

  .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 600px;
    width: 100%;
    margin-inline: auto;
  }

  .lotto-numbers {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 80px; /* Reserve space for balls */
  }

  .generate-btn {
    font-family: inherit;
    font-size: var(--font-size-lg);
    font-weight: 700;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 50px;
    color: var(--text-color);
    background: linear-gradient(145deg, var(--accent-color), var(--accent-color-dark));
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 15px var(--shadow-color),
                0 1px 2px inset oklch(from var(--accent-color) l c h / 1),
                0 -1px 1px inset oklch(from var(--accent-color-dark) l c h / 1);
  }

  .generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px oklch(from var(--shadow-color) l c h / 1.5),
                0 1px 2px inset oklch(from var(--accent-color) l c h / 1),
                0 -1px 1px inset oklch(from var(--accent-color-dark) l c h / 1);
  }

  .generate-btn:active {
    transform: translateY(1px);
     box-shadow: 0 2px 10px var(--shadow-color),
                0 1px 2px inset oklch(from var(--accent-color) l c h / 1),
                0 -1px 1px inset oklch(from var(--accent-color-dark) l c h / 1);
  }

  /* Theme Toggle Button */
  .theme-toggle-btn {
      position: absolute;
      top: calc(var(--spacing-md) * -0.5);
      right: 0;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: var(--spacing-xs);
      border-radius: 50%;
      color: var(--text-color);
      transition: background-color 0.2s ease, color 0.2s ease;
  }

  .theme-toggle-btn:hover {
      background: oklch(from var(--text-color) l c h / 0.1);
  }

  .theme-toggle-btn svg {
      width: 28px;
      height: 28px;
      transition: transform 0.5s ease;
  }

  /* Hide moon by default */
  .moon {
      display: none;
  }

  /* Show sun, hide moon in light mode */
  :root:not([data-theme='dark']) .sun {
      display: block;
  }
   :root:not([data-theme='dark']) .moon {
      display: none;
  }

  /* Show moon, hide sun in dark mode */
  [data-theme='dark'] .sun {
      display: none;
  }

  [data-theme='dark'] .moon {
      display: block;
  }
  
  /* Animation for icons */
  [data-theme='dark'] .sun,
  :root:not([data-theme='dark']) .moon {
    transform: rotate(360deg) scale(0);
  }

  [data-theme='dark'] .moon,
  :root:not([data-theme='dark']) .sun {
    transform: rotate(0) scale(1);
  }
}

@layer utilities {
    /* Animation for the balls appearing */
    @keyframes appear {
        from {
            transform: scale(0) translateY(-50px);
            opacity: 0;
        }
        to {
            transform: scale(1) translateY(0);
            opacity: 1;
        }
    }
}