:root {
  --app-green-main: #2e7d32;
  --app-green-dark: #1b5e20;
  --app-green-light: #66bb6a;
  --app-page-max-width: 1180px;
  --app-page-radius: 24px;
  --app-page-shadow: 0 22px 60px rgba(0,0,0,0.22);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    "Segoe UI",
    "Hiragino Sans",
    "Yu Gothic",
    "Meiryo",
    Arial,
    sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.25), transparent 34%),
    linear-gradient(
      135deg,
      var(--app-green-dark) 0%,
      var(--app-green-main) 46%,
      var(--app-green-light) 100%
    );
  color: #1f2933;
  min-height: 100vh;
}

.page-shell {
  width: 100%;
  min-height: 100vh;
  padding: 42px 18px;
}

.page-shell.is-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.main-container {
  width: min(100%, var(--app-page-max-width));
  margin: 0 auto;
  background: rgba(255,255,255,0.98);
  border-radius: var(--app-page-radius);
  box-shadow: var(--app-page-shadow);
  overflow: hidden;
}

.main-container.is-compact {
  width: min(100%, 760px);
}

.main-container.is-login {
  width: min(100%, 650px);
}

@media (max-width: 640px) {
  .page-shell {
    padding: 18px 10px;
  }

  .page-shell.is-center {
    align-items: flex-start;
  }

  .main-container {
    border-radius: 18px;
  }
}