:root {
  --navy: #0f3a6b;
  --blue: #1f5fa8;
  --blue-soft: #e8f0fa;
  --page: #f5f8fc;
  --card: #ffffff;
  --border: #d9e4f0;
  --text: #1d2733;
  --muted: #5a6878;
  --error: #b42318;
  --pdf: #d1372a;
  --word: #2b5fb4;
  --excel: #1d7a46;
  --ppt: #c4521c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.7;
}

/* ---------- パスワード入力ページ ---------- */

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: linear-gradient(180deg, var(--blue-soft) 0%, var(--page) 60%);
}

.login-card {
  width: 100%;
  max-width: 420px;
  padding: 40px 32px 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(15, 58, 107, 0.08);
  text-align: center;
}

.login-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--navy);
  color: #fff;
  font-size: 26px;
  font-weight: 700;
}

.login-title {
  margin: 0 0 8px;
  color: var(--navy);
  font-size: 22px;
}

.login-lead {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

.login-error {
  margin: 0 0 16px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fdecea;
  color: var(--error);
  font-size: 14px;
}

.login-form { text-align: left; }

.login-label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 700;
}

.login-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
}

.login-input:focus {
  outline: 3px solid rgba(31, 95, 168, 0.25);
  border-color: var(--blue);
}

.login-button {
  width: 100%;
  margin-top: 16px;
  padding: 12px;
  border: 0;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.login-button:hover { background: var(--navy); }

.login-note {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 12px;
}

/* ---------- 資料一覧ページ ---------- */

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.hero-cover {
  display: block;
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 0 0 16px 16px;
}

.hero-panel {
  position: relative;
  margin: -40px 24px 0;
  padding: 24px 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(15, 58, 107, 0.08);
}

.hero-title {
  margin: 0 0 6px;
  color: var(--navy);
  font-size: 28px;
}

.hero-lead {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.categories {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

/* 上段 ①〜③ は3列、下段 ④⑤ は2列 */
.category { grid-column: span 2; }
.category:nth-child(n + 4) { grid-column: span 3; }

.category {
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.category-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.category-number {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}

.category-title {
  margin: 0;
  color: var(--navy);
  font-size: 18px;
  line-height: 1.4;
}

.category-description {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.group-label {
  margin: 14px 0 6px;
  color: var(--blue);
  font-size: 14px;
}

.file-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.file-list li + li { margin-top: 8px; }

.file-link {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
}

.file-link:hover {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.file-type {
  flex: none;
  min-width: 46px;
  padding: 2px 6px;
  border-radius: 6px;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  text-align: center;
}

.file-type.pdf { background: var(--pdf); }
.file-type.word { background: var(--word); }
.file-type.excel { background: var(--excel); }
.file-type.ppt { background: var(--ppt); }
.file-type.other { background: var(--muted); }

.file-name {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  overflow-wrap: anywhere;
}

.file-size {
  flex: none;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 900px) {
  .category,
  .category:nth-child(n + 4) { grid-column: span 3; }
}

@media (max-width: 640px) {
  .categories { grid-template-columns: 1fr; }
  .category,
  .category:nth-child(n + 4) { grid-column: auto; }
  .hero-cover { height: 110px; }
  .hero-panel { margin: -28px 8px 0; padding: 18px 20px; }
  .hero-title { font-size: 22px; }
}