/* CSS Variables */
:root {
  /* Colors */
  --color-red: #CF0000;
  --color-dark-red: #A70000;
  --color-blue: #00A0D0;
  --color-black: #000000;
  --color-gray: #6E6E6E;
  --color-light-gray: #C8C8C8;
  --color-lighter-gray: #F2F2F2;
  --color-white: #FFFFFF;
  
  /* Font Sizes */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  
  /* Font Family */
  --font-family: "Murecho", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-black: 900;
  
  /* Layout */
  --max-width: 600px;
}

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

/* Body */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-black);
  background-color: var(--color-white);
  line-height: 1.6;
  min-height: 100vh;
}

/* Container */
.main-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Links */
a {
  text-decoration: none;
  color: inherit;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Buttons */
button {
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  outline: none;
}

button:disabled {
  cursor: not-allowed;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mb-1 {
  margin-bottom: 0.25rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-3 {
  margin-bottom: 0.75rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mt-2 {
  margin-top: 0.5rem;
}

.py-3 {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.px-3 {
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}

.px-4 {
  padding-left: 1rem;
  padding-right: 1rem;
}

.py-4 {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.py-6 {
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.gap-2 {
  gap: 0.5rem;
}

.gap-3 {
  gap: 0.75rem;
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}