:root {
  --md-primary: #1976d2;
  --md-primary-dark: #115293;
  --md-primary-light: #e3f2fd;
  --md-on-primary: #ffffff;
  --md-surface: #ffffff;
  --md-background: #f5f7fb;
  --md-on-surface: #172033;
  --md-on-surface-variant: #5f6b7a;
  --md-outline: #dfe5ee;
  --md-success: #2e7d32;
  --md-warning: #ed6c02;
  --drawer-width: 312px;
  --topbar-height: 64px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--md-background);
  color: var(--md-on-surface);
  font-family: "Noto Sans JP", "Roboto", Arial, sans-serif;
  line-height: 1.7;
}
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }

.app-shell { min-height: 100vh; display: flex; }
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--drawer-width);
  background: #fff;
  border-right: 1px solid var(--md-outline);
  display: flex;
  flex-direction: column;
  z-index: 30;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  min-height: 84px;
}
.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--md-primary);
  color: #fff;
  font-size: 24px;
}
.brand-title { font-size: 16px; font-weight: 700; }
.brand-subtitle { color: var(--md-on-surface-variant); font-size: 12px; margin-top: 2px; }
.sidebar-divider { height: 1px; background: var(--md-outline); }
.sidebar-nav { padding: 12px; overflow: auto; flex: 1; }
.nav-label {
  padding: 18px 12px 8px;
  color: var(--md-on-surface-variant);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.nav-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--md-on-surface);
  display: flex;
  align-items: flex-start;
  gap: 13px;
  text-align: left;
  padding: 11px 12px;
  border-radius: 10px;
  cursor: pointer;
  margin-bottom: 3px;
}
.nav-item:hover { background: #f1f5f9; }
.nav-item.active { background: var(--md-primary-light); color: var(--md-primary-dark); }
.nav-item .material-icons-round { font-size: 21px; margin-top: 1px; color: var(--md-on-surface-variant); }
.nav-item.active .material-icons-round { color: var(--md-primary); }
.nav-copy { min-width: 0; }
.nav-title { display: block; font-size: 13.5px; line-height: 1.45; font-weight: 600; }
.nav-period { display: block; color: var(--md-on-surface-variant); font-size: 10.5px; margin-top: 2px; }
.sidebar-footer { border-top: 1px solid var(--md-outline); padding: 16px; }
.full-width { width: 100%; }
.sidebar-scrim { display: none; }

.main-column { margin-left: var(--drawer-width); min-width: 0; width: calc(100% - var(--drawer-width)); }
.top-app-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 28px;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--md-outline);
  backdrop-filter: blur(8px);
}
.top-app-bar-title { flex: 1; font-size: 16px; font-weight: 700; }
.year-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 11px;
  border-radius: 14px;
  border: 1px solid #90caf9;
  color: var(--md-primary-dark);
  font-size: 12px;
  font-weight: 700;
}
.icon-button {
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.icon-button:hover { background: #eef3f8; }
.mobile-menu { display: none; }
.page-container { max-width: 1420px; margin: 0 auto; padding: 36px 44px 64px; }

.page-header { margin-bottom: 30px; }
.page-eyebrow { color: var(--md-primary); font-size: 12px; font-weight: 700; letter-spacing: .08em; margin-bottom: 7px; }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { font-size: clamp(30px, 4vw, 42px); line-height: 1.25; margin-bottom: 10px; letter-spacing: -.02em; }
h2 { font-size: 24px; line-height: 1.35; margin-bottom: 8px; }
h3 { font-size: 18px; line-height: 1.45; margin-bottom: 8px; }
.page-description { max-width: 900px; color: var(--md-on-surface-variant); font-size: 16px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 17px; }
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 11px;
  border-radius: 15px;
  background: #eef1f5;
  color: #344054;
  font-size: 12px;
  font-weight: 600;
}
.chip.primary { background: var(--md-primary-light); color: var(--md-primary-dark); }
.chip.outlined { background: #fff; border: 1px solid var(--md-outline); }

.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; margin-bottom: 42px; }
.material-card {
  background: var(--md-surface);
  border: 1px solid var(--md-outline);
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(30,56,91,.045);
}
.stat-card { padding: 20px; }
.stat-value { color: var(--md-primary); font-size: 26px; font-weight: 700; line-height: 1.2; }
.stat-label { color: var(--md-on-surface-variant); font-size: 13px; margin-top: 5px; }
.section-block { margin-top: 42px; }
.section-heading { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.section-heading .material-icons-round { color: var(--md-primary); font-size: 25px; margin-top: 1px; }
.section-heading p { margin: 3px 0 0; color: var(--md-on-surface-variant); font-size: 13.5px; }
.activity-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.activity-card { overflow: hidden; }
.activity-card-button {
  display: block;
  width: 100%;
  min-height: 100%;
  border: 0;
  background: #fff;
  text-align: left;
  cursor: pointer;
  padding: 22px;
}
.activity-card-button:hover { background: #fbfdff; }
.activity-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.activity-card-left { display: flex; align-items: center; gap: 13px; min-width: 0; }
.activity-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}
.activity-avatar.system { background: #e3f2fd; color: #1565c0; }
.activity-avatar.event { background: #fff3e0; color: #e65100; }
.activity-avatar.student-council { background: #e8f5e9; color: #2e7d32; }
.activity-title { font-size: 16px; font-weight: 700; line-height: 1.45; }
.activity-period { color: var(--md-on-surface-variant); font-size: 11.5px; margin-top: 2px; }
.activity-card .arrow { color: #98a2b3; }
.activity-summary { margin: 15px 0 0; color: var(--md-on-surface-variant); font-size: 13.5px; line-height: 1.75; }

.tab-bar {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--md-outline);
  padding: 0 18px;
  background: #fff;
}
.tab-button {
  position: relative;
  min-width: 100px;
  height: 52px;
  border: 0;
  background: transparent;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  font-weight: 600;
}
.tab-button.active { color: var(--md-primary); }
.tab-button.active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--md-primary);
}
.tab-panel { padding: 24px; }
.segmented-control {
  display: inline-flex;
  border: 1px solid var(--md-outline);
  border-radius: 9px;
  overflow: hidden;
  margin: 4px 0 18px;
  background: #fff;
}
.segmented-button {
  border: 0;
  border-right: 1px solid var(--md-outline);
  padding: 9px 14px;
  background: #fff;
  color: var(--md-on-surface-variant);
  font-weight: 600;
  cursor: pointer;
}
.segmented-button:last-child { border-right: 0; }
.segmented-button.active { background: var(--md-primary-light); color: var(--md-primary-dark); }

.info-card-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.info-card { padding: 20px; }
.info-card-title { display: flex; align-items: center; gap: 9px; color: var(--md-primary); font-weight: 700; margin-bottom: 10px; }
.info-card-title .material-icons-round { font-size: 21px; }
.info-card p { color: var(--md-on-surface-variant); font-size: 13.5px; margin: 0; }
.two-column { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.stack { display: grid; gap: 16px; }
.content-card { padding: 22px; }
.content-card-title { display: flex; align-items: center; gap: 9px; color: var(--md-primary); margin-bottom: 13px; }
.content-card-title .material-icons-round { font-size: 22px; }
.content-card-title h3 { margin: 0; color: var(--md-on-surface); }
.content-card p { color: var(--md-on-surface-variant); margin-bottom: 0; font-size: 14px; }
.check-list { display: grid; gap: 10px; }
.check-item { display: flex; align-items: flex-start; gap: 10px; color: var(--md-on-surface-variant); font-size: 14px; }
.check-item .material-icons-round { color: var(--md-primary); font-size: 19px; margin-top: 2px; }

.timeline-list { display: grid; }
.timeline-item { display: grid; grid-template-columns: 20px 1fr; gap: 14px; }
.timeline-marker { position: relative; display: flex; justify-content: center; }
.timeline-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--md-primary); margin-top: 7px; z-index: 1; }
.timeline-line { position: absolute; top: 17px; bottom: -8px; width: 2px; background: #bbdefb; }
.timeline-copy { padding-bottom: 22px; }
.timeline-date { color: var(--md-primary); font-size: 11.5px; font-weight: 700; }
.timeline-title { font-size: 14px; font-weight: 700; margin-top: 2px; }
.timeline-detail { color: var(--md-on-surface-variant); font-size: 13px; margin-top: 2px; }

.gantt-scroll { overflow-x: auto; }
.gantt-table { min-width: 1100px; }
.gantt-row { display: grid; grid-template-columns: 240px 1fr; min-height: 58px; border-bottom: 1px solid var(--md-outline); }
.gantt-row:last-child { border-bottom: 0; }
.gantt-label { padding: 10px 12px; border-right: 1px solid var(--md-outline); }
.gantt-label strong { display: block; font-size: 13px; }
.gantt-label span { color: var(--md-on-surface-variant); font-size: 10.5px; }
.gantt-months { display: grid; position: relative; }
.gantt-month { border-right: 1px solid #edf1f6; font-size: 10px; color: var(--md-on-surface-variant); text-align: center; padding-top: 10px; }
.gantt-track { position: relative; height: 58px; }
.gantt-bar { position: absolute; top: 17px; height: 24px; border-radius: 12px; }
.gantt-bar.system { background: #1976d2; }
.gantt-bar.event { background: #ed6c02; }
.gantt-bar.student-council { background: #2e7d32; }

.notice-list { display: grid; gap: 12px; }
.notice-row { display: flex; align-items: flex-start; gap: 12px; }
.notice-row .material-icons-round { margin-top: 1px; }
.notice-row strong { display: block; font-size: 14px; margin-bottom: 2px; }
.notice-row span { color: var(--md-on-surface-variant); font-size: 13px; }

.back-button { margin-bottom: 16px; }
.report-actions { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.report-summary-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.detail-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; }
.detail-grid .full { grid-column: 1 / -1; }
.evidence-row { display: flex; flex-wrap: wrap; gap: 8px; }
.term-guide { display: grid; gap: 12px; margin: 0; }
.term-guide div { display: grid; grid-template-columns: minmax(110px, .28fr) 1fr; gap: 14px; align-items: start; }
.term-guide dt { color: var(--md-on-surface); font-size: 14px; font-weight: 700; }
.term-guide dd { margin: 0; color: var(--md-on-surface-variant); font-size: 14px; }

@media (max-width: 1100px) {
  .stats-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .activity-grid { grid-template-columns: 1fr; }
  .info-card-grid { grid-template-columns: 1fr; }
  .two-column, .report-summary-layout, .detail-grid { grid-template-columns: 1fr; }
  .detail-grid .full { grid-column: auto; }
}

@media (max-width: 840px) {
  .sidebar { transform: translateX(-100%); transition: transform .22s ease; box-shadow: 0 10px 30px rgba(0,0,0,.16); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-scrim { position: fixed; inset: 0; background: rgba(0,0,0,.32); z-index: 25; }
  .sidebar-scrim.open { display: block; }
  .main-column { margin-left: 0; width: 100%; }
  .mobile-menu { display: grid; }
  .top-app-bar { padding: 0 16px; }
  .page-container { padding: 28px 18px 48px; }
}

@media (max-width: 560px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-card { padding: 16px; }
  .page-container { padding-left: 14px; padding-right: 14px; }
  .tab-panel { padding: 16px; }
  .activity-card-button { padding: 18px; }
  .year-chip { display: none; }
  .term-guide div { grid-template-columns: 1fr; gap: 2px; }
}

/* Material Components fallback styles so the site remains usable without the CDN. */
.mdc-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  border-radius: 4px;
  border: 0;
  background: transparent;
  color: var(--md-primary);
  font-weight: 700;
  letter-spacing: .01em;
  cursor: pointer;
}
.mdc-button:hover { background: rgba(25,118,210,.06); }
.mdc-button--raised { background: var(--md-primary); color: #fff; box-shadow: 0 2px 5px rgba(25,118,210,.24); }
.mdc-button--raised:hover { background: var(--md-primary-dark); }
.mdc-button--outlined { border: 1px solid #90caf9; background: #fff; }
.mdc-button__icon { font-size: 20px; }