:root {
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-border: #d9dee3;
  --color-text: #222831;
  --color-muted: #6b7480;
  --color-primary: #2f6f4f;
  --color-primary-dark: #234f38;
  --color-danger: #b3392c;
  --color-danger-bg: #fbeceA;
  --color-success-bg: #eaf5ee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Meiryo", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

a {
  color: var(--color-primary);
}

header.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header.app-header .brand {
  font-weight: bold;
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

header.app-header nav {
  display: flex;
  align-items: center;
}

header.app-header nav .nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: 1rem;
  text-decoration: none;
  white-space: nowrap;
}

header.app-header nav .nav-item-form {
  margin-left: 1rem;
}

.nav-icon {
  font-size: 1rem;
  line-height: 1;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-primary);
  text-decoration: underline;
  cursor: pointer;
  font-size: 1rem;
}

.link-button:hover {
  background: none;
  color: var(--color-primary-dark);
}

main.app-main {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
}

.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
}

.login-card {
  width: 100%;
  max-width: 360px;
}

.login-card h1 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary-dark);
  text-align: center;
}

.form-field {
  margin-bottom: 1rem;
}

.form-field label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  color: var(--color-muted);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 1rem;
}

.form-field input[type="checkbox"] {
  width: auto;
  padding: 0;
}

button, .btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}

button:hover, .btn:hover {
  background: var(--color-primary-dark);
}

.btn-danger {
  background: var(--color-danger);
}

.btn-block {
  width: 100%;
}

.errorlist {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
  color: var(--color-danger);
  background: var(--color-danger-bg);
  border-radius: 4px;
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
}

.messages {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
}

.messages li {
  padding: 0.6rem 0.8rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  background: var(--color-success-bg);
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th, table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--color-border);
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: var(--color-border);
}

.page-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.hamburger-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

.nav-overlay {
  display: none;
}

/* --- スマートフォン向け --- */
@media (max-width: 640px) {
  header.app-header {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }

  .hamburger-btn {
    display: flex;
  }

  header.app-header .brand {
    flex: 1;
  }

  header.app-header nav {
    position: fixed;
    top: 0;
    left: -280px;
    width: 260px;
    height: 100vh;
    background: var(--color-surface);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.15);
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem 1.25rem;
    transition: left 0.2s ease;
    z-index: 1001;
    overflow-y: auto;
  }

  header.app-header nav.open {
    left: 0;
  }

  header.app-header nav .nav-item,
  header.app-header nav .nav-item-form {
    margin-left: 0;
    width: 100%;
  }

  header.app-header nav .nav-item {
    padding: 0.75rem 0.25rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
  }

  header.app-header nav .nav-item-form {
    border-bottom: 1px solid var(--color-border);
  }

  header.app-header nav .nav-item-form .nav-item {
    border-bottom: none;
    width: 100%;
    padding: 0.75rem 0.25rem;
    text-align: left;
  }

  .nav-icon {
    font-size: 1.2rem;
    width: 1.5rem;
    text-align: center;
  }

  .nav-overlay.visible {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 1000;
  }

  main.app-main {
    margin: 1rem auto;
    padding: 0 1rem;
  }

  .card {
    padding: 1rem;
  }

  .login-card {
    max-width: 100%;
  }

  .page-header-row {
    flex-direction: column;
    align-items: stretch;
  }

  .page-header-row .btn,
  .page-header-row a.btn {
    width: 100%;
    text-align: center;
  }

  table {
    font-size: 0.9rem;
  }

  .table-scroll table {
    white-space: nowrap;
  }

  button, .btn {
    padding: 0.7rem 1.1rem;
  }
}