:root {
  --bg: #e8eef2;
  --bg-deep: #d5dee6;
  --ink: #1a2330;
  --ink-muted: #5a6a7a;
  --accent: #0d7377;
  --accent-hover: #095e61;
  --accent-soft: #d4eef0;
  --line: #b8c5d0;
  --surface: #f7fafc;
  --topbar: #15202b;
  --topbar-text: #e8f0f4;
  --topbar-muted: #9eb0be;
  --warn: #9a3412;
  --warn-bg: #fff1eb;
  --ok-bg: #e6f5f4;
  --shadow: 0 1px 0 rgba(21, 32, 43, 0.06);
  --radius: 6px;
  --font: "IBM Plex Sans JP", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

html { font-size: 15px; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  line-height: 1.55;
  background-color: var(--bg);
  background-image:
    linear-gradient(165deg, #f0f5f8 0%, transparent 42%),
    linear-gradient(12deg, transparent 55%, rgba(13, 115, 119, 0.06) 100%),
    repeating-linear-gradient(
      -18deg,
      transparent,
      transparent 11px,
      rgba(26, 35, 48, 0.03) 11px,
      rgba(26, 35, 48, 0.03) 12px
    );
  background-attachment: fixed;
  min-height: 100vh;
}

body.is-login {
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--accent-hover); }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  padding: 0.85rem 1.5rem;
  background: var(--topbar);
  color: var(--topbar-text);
  border-bottom: 3px solid var(--accent);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
}
.brand-title {
  font-family: "Zen Maru Gothic", "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  color: #fff;
}
.app-version {
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--topbar-muted);
  letter-spacing: 0.02em;
}

.login-panel h1 {
  font-family: "Zen Maru Gothic", "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}
.login-panel .login-version {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.topbar-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.35rem;
}

.topbar-nav a {
  color: var(--topbar-muted);
  text-decoration: none;
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 500;
}
.topbar-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-left: 0.35rem;
  padding-left: 0.65rem;
  border-left: 1px solid rgba(158, 176, 190, 0.35);
}

.topbar button {
  background: transparent;
  border: 1px solid rgba(158, 176, 190, 0.55);
  color: var(--topbar-text);
  border-radius: var(--radius);
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
}
.topbar button:hover {
  border-color: #c5d4de;
  background: rgba(255, 255, 255, 0.06);
}

.inline { display: inline; margin: 0; }

.container {
  padding: 1.5rem 1.35rem 2.5rem;
  max-width: 1180px;
  margin: 0 auto;
}

.messages {
  list-style: none;
  padding: 0.75rem 1.35rem 0;
  max-width: 1180px;
  margin: 0 auto;
}
.messages li {
  padding: 0.65rem 0.9rem;
  margin: 0.4rem 0;
  background: var(--ok-bg);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.messages .error,
.messages .warning {
  background: var(--warn-bg);
  border-color: var(--warn);
}

h1 {
  margin: 0 0 0.4rem;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}
h2 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  font-weight: 650;
}
h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 650;
}

.page-lead {
  margin: 0 0 1.1rem;
  color: var(--ink-muted);
  max-width: 42rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 0;
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}
th, td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.6rem;
  vertical-align: top;
  font-size: 0.92rem;
}
th {
  background: #e2ebf0;
  font-weight: 650;
  text-align: left;
  color: #243040;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
}

.actions a,
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none !important;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius);
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.3;
}
.actions a:hover,
.btn:hover {
  background: var(--accent-hover);
  color: #fff !important;
}
.btn-secondary {
  background: #3d4f5f;
}
.btn-secondary:hover {
  background: #2f3e4b;
}

.grid-board {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  margin-bottom: 0.5rem;
}

.board-cat {
  margin: 1.75rem 0 0.75rem;
  padding: 0.15rem 0 0.4rem;
  border-bottom: 2px solid var(--accent);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.board-cat:first-of-type { margin-top: 0.5rem; }

.muted { color: var(--ink-muted); font-size: 0.85rem; }

.changed {
  outline: 2px solid #c45c26;
  background: #fff4ec;
}

.form-row { margin-bottom: 0.85rem; }
.form-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 0.92rem;
}

input,
select,
textarea {
  width: 100%;
  max-width: 420px;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--ink);
}
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

/* Login */
.login-shell {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem 3rem;
}
.login-panel {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem 1.5rem;
  box-shadow: var(--shadow);
}
.login-panel .login-sub {
  margin: 0 0 1.25rem;
  color: var(--ink-muted);
  font-size: 0.9rem;
}
.login-panel form p { margin: 0 0 0.9rem; }
.login-panel form label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}
.login-panel form input {
  max-width: none;
}
.login-panel .btn {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.6rem 1rem;
}

.monthly-wrap { overflow-x: auto; }

.month-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.month-nav .month-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}
.nav-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff !important;
  text-decoration: none !important;
  font-size: 1.25rem;
  line-height: 1;
}
.nav-arrow:hover {
  background: var(--accent-hover);
  filter: none;
}

/* 【センター】講習予定一覧 Excel 形式 */
.center-sheet {
  border-collapse: collapse;
  min-width: 1100px;
  width: 100%;
  background: #fff;
  font-size: 0.86rem;
}
.center-sheet th,
.center-sheet td {
  border: 1px solid #7a8790;
  padding: 0.28rem 0.35rem;
  vertical-align: top;
}
.center-sheet thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: #d4e0e6;
  font-weight: 700;
  text-align: center;
}
.center-sheet th.sub {
  top: 2.1rem;
  font-size: 0.75rem;
  font-weight: 600;
  background: #e8eef2;
}
.center-sheet .col-date {
  width: 3.6rem;
  text-align: center;
  background: #eef3f6;
  position: sticky;
  left: 0;
  z-index: 1;
}
.center-sheet thead .col-date { z-index: 3; }
.center-sheet .col-side { width: 5rem; font-size: 0.75rem; }
.center-sheet .day-num { font-weight: 700; font-size: 0.95rem; }
.center-sheet .day-w { font-size: 0.72rem; color: #556; }
.center-sheet tr.weekend .col-date { background: #e8f2f2; }
.center-sheet .slot-cell.empty { background: #fafafa; }
.center-sheet .kind-name { font-weight: 800; color: var(--a, #0d5c70); }
.center-sheet .kind-cont { font-weight: 700; color: #668; text-align: center; }
.center-sheet .kind-type { font-size: 0.78rem; }
.center-sheet .interp { color: #345; font-size: 0.8rem; }
.center-sheet .tiny { font-size: 0.68rem; }
.center-sheet .party {
  line-height: 1.35;
  margin-bottom: 0.2rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px dotted #c5ced4;
}
.center-sheet .party:last-child { border-bottom: 0; }
.center-sheet .party-org { font-weight: 700; }
.center-sheet .party-host { color: #334; }
.center-sheet .party-nat {
  display: inline-block;
  margin-left: 0.15rem;
  font-weight: 800;
  color: #0d5c70;
}
.center-sheet .party-n {
  display: inline-block;
  min-width: 1.1rem;
  margin-left: 0.1rem;
  font-weight: 800;
}
.center-sheet .kind.cont {
  border-left: 3px solid var(--a, #0d5c70);
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .topbar-actions {
    margin-left: 0;
    padding-left: 0;
    border-left: 0;
  }
  .month-nav { gap: 0.5rem; }
  .month-nav .month-title { font-size: 1.05rem; }
  .container { padding: 1.1rem 0.9rem 2rem; }
}