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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: #666;
  background-color: #fafafa;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: #44bcce;
  text-decoration: none;
  transition: opacity 0.3s;
}

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  height: auto;
}

/* ===== Header ===== */
.header {
  background: #fafafa;
  padding: 24px 32px;
}

.header-logo img {
  height: 36px;
  width: auto;
}

/* ===== Main Content ===== */
.main {
  flex: 1;
  padding: 24px 24px 80px;
}

.container {
  max-width: 640px;
  margin: 0 auto;
}

/* ===== Footer ===== */
.footer {
  padding: 32px 24px;
  text-align: center;
}

.footer-copy {
  font-size: 12px;
  color: #999;
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
  .main {
    padding: 16px 16px 60px;
  }

  .header {
    padding: 16px;
  }

  .header-logo img {
    height: 30px;
  }
}