@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --glass-bg: rgba(15, 15, 25, 0.45);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --text-primary: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.7);
  --accent: #7c8aff;
  --accent-glow: rgba(124, 138, 255, 0.3);
  --red-mark: #ff6b7a;
  --green-mark: #5cd9a6;
  --blue-mark: #5b9cf5;
  --radius: 16px;
  --radius-sm: 10px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  /* Remove smooth scroll on html since we paginate */
}

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  color: var(--text-primary);
  background: #0a0a14;
  overflow-x: hidden;
  /* Body just holds the current active section, let the active section dictate height */
}

/* === FIXED BACKGROUND CONTAINER (No longer fixed for Option B) === */
.background-container {
  display: none; /* Backgrounds move into sections for Option B */
}

/* === PAGES (Sections) === */
.bg-section {
  position: relative;
  width: 100%;
  background-size: 100% auto;
  background-position: top center;
  background-repeat: no-repeat;
  background-color: transparent;
  display: none;
  align-items: flex-start;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
}

.bg-section.active {
  display: flex;
  opacity: 1;
  z-index: 10;
}

.bg-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.15); /* Light overlay for content readability */
  pointer-events: none;
  z-index: 1;
}

.section-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 960px;
  padding: 60px 24px;
}

/* === HEADER / TITLE === */
.page-title {
  text-align: center;
  margin-bottom: 40px;
}

.page-title h1 {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7), 0 0 20px rgba(0, 0, 0, 0.4);
}

.page-title .subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 8px;
  letter-spacing: 0.04em;
  text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.6);
}

/* === GLASS CARD === */
.glass-card {
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
}

/* === NAV GRID (3x3) === */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.nav-item {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 20px 14px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.nav-item .nav-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.nav-item .nav-url {
  font-size: 0.75rem;
  color: #a0a0a0;
  word-break: break-all;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
}

/* === SITES LIST === */
.sites-container {
  max-height: 320px;
  overflow-y: auto;
  padding-right: 4px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sites-container::-webkit-scrollbar {
  width: 0;
}

.sites-container:hover {
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}

.sites-container:hover::-webkit-scrollbar {
  width: 5px;
}

.sites-container:hover::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.site-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  cursor: pointer;
  transition: all 0.25s ease;
  border-radius: var(--radius-sm);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 8px;
}

.site-row:last-child {
  margin-bottom: 0;
}

.site-row:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(4px);
}

.site-row .site-name {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-primary);
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.site-row .site-url {
  font-size: 0.82rem;
  color: #a0a0a0;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
}

/* === SECTION TITLES === */
.section-label {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7), 0 0 12px rgba(0, 0, 0, 0.4);
}

.section-label .icon {
  font-size: 1.1rem;
}

/* === CALENDAR === */
.calendar-wrapper {
  user-select: none;
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.calendar-header .month-year {
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.calendar-header .cal-buttons {
  display: flex;
  gap: 6px;
}

.cal-btn {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  transition: all 0.2s ease;
}

.cal-btn:hover {
  background: rgba(124, 138, 255, 0.2);
  border-color: rgba(124, 138, 255, 0.3);
}

.cal-btn.today-btn {
  width: auto;
  padding: 0 16px;
  font-size: 1rem;
  font-weight: 500;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  max-width: 680px;
  margin: 0 auto;
}

.cal-day-header {
  text-align: center;
  font-size: 1.05rem;
  color: var(--text-secondary);
  padding: 8px 0;
  font-weight: 500;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.cal-day {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
  background: rgba(255, 255, 255, 0.05); /* very light base */
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.cal-day:hover {
  background: rgba(255, 255, 255, 0.1);
}

.cal-day.other-month {
  color: rgba(255, 255, 255, 0.2);
}

.cal-day.today {
  background: rgba(92, 217, 166, 0.2);
  color: var(--green-mark);
  font-weight: 700;
  border: 1px solid rgba(92, 217, 166, 0.3);
}

.cal-day.selected {
  background: rgba(91, 156, 245, 0.25);
  color: var(--blue-mark);
  font-weight: 600;
  border: 1px solid rgba(91, 156, 245, 0.4);
}

.cal-day.has-memo {
  color: var(--red-mark);
  font-weight: 600;
}

.cal-day.has-memo::after {
  content: '';
  position: absolute;
  bottom: 3px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--red-mark);
}

/* === MEMO PANEL === */
.memo-panel {
  margin-top: 20px;
}

.memo-type-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.memo-type-btn {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: inherit;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
}

.memo-type-btn:hover,
.memo-type-btn.active {
  background: rgba(124, 138, 255, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.memo-form {
  display: none;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.memo-form.visible {
  display: flex;
}

.memo-form input,
.memo-form select {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease;
}

.memo-form input:focus,
.memo-form select:focus {
  border-color: var(--accent);
}

.memo-form .form-row {
  display: flex;
  gap: 10px;
}

.memo-form .form-row > * {
  flex: 1;
}

.memo-submit-btn {
  background: linear-gradient(135deg, var(--accent), #6c5ce7);
  border: none;
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: inherit;
  align-self: flex-start;
}

.memo-submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* Day memo list */
.day-memos {
  margin-top: 16px;
}

.day-memo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 8px;
  margin-bottom: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.day-memo-item .memo-title {
  font-size: 0.88rem;
  font-weight: 500;
}

.day-memo-item .memo-type-tag {
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(124, 138, 255, 0.15);
  color: var(--accent);
}

.day-memo-item .memo-delete {
  background: none;
  border: none;
  color: rgba(255, 107, 122, 0.6);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.2s;
}

.day-memo-item .memo-delete:hover {
  color: var(--red-mark);
  background: rgba(255, 107, 122, 0.1);
}

/* === POPUP MODAL === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: rgba(20, 20, 35, 0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 480px;
  width: 90%;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.visible .modal-box {
  transform: translateY(0);
}

.modal-box h2 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reminder-item {
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 0 8px 8px 0;
  margin-bottom: 10px;
}

.reminder-item .r-title {
  font-weight: 600;
  font-size: 0.92rem;
}

.reminder-item .r-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.reminder-item .r-days {
  font-size: 0.78rem;
  color: var(--accent);
  margin-top: 2px;
}

.modal-close-btn {
  background: linear-gradient(135deg, var(--accent), #6c5ce7);
  border: none;
  color: white;
  padding: 10px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 16px;
  width: 100%;
  transition: all 0.25s ease;
  font-family: inherit;
}

.modal-close-btn:hover {
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* === BGM BUTTON === */
.bgm-btn {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 900;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.bgm-btn:hover {
  background: rgba(124, 138, 255, 0.2);
  border-color: var(--accent);
  transform: scale(1.08);
}

.bgm-btn.playing .music-bars {
  animation: musicPulse 0.8s ease-in-out infinite alternate;
}

.music-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 16px;
}

.music-bars span {
  display: block;
  width: 3px;
  background: var(--accent);
  border-radius: 1px;
  transition: height 0.2s ease;
}

.bgm-btn.playing .music-bars span:nth-child(1) { animation: bar1 0.6s ease-in-out infinite alternate; }
.bgm-btn.playing .music-bars span:nth-child(2) { animation: bar2 0.5s ease-in-out infinite alternate 0.1s; }
.bgm-btn.playing .music-bars span:nth-child(3) { animation: bar3 0.7s ease-in-out infinite alternate 0.2s; }
.bgm-btn.playing .music-bars span:nth-child(4) { animation: bar4 0.55s ease-in-out infinite alternate 0.15s; }

.bgm-btn:not(.playing) .music-bars span {
  height: 4px !important;
}

@keyframes bar1 { from { height: 4px; } to { height: 14px; } }
@keyframes bar2 { from { height: 6px; } to { height: 10px; } }
@keyframes bar3 { from { height: 3px; } to { height: 16px; } }
@keyframes bar4 { from { height: 5px; } to { height: 12px; } }

/* === PAGE NAVIGATION ARROWS === */
.nav-arrows {
  position: fixed;
  left: 20px;
  bottom: 40px;
  display: flex;
  gap: 16px;
  z-index: 900;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.nav-arrows.visible {
  opacity: 1;
}

/* Hovering near the left bottom area triggers visibility */
.nav-trigger-area {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 250px;
  height: 200px;
  z-index: 890;
}

.arrow-btn {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.arrow-btn:hover {
  background: rgba(124, 138, 255, 0.3);
  border-color: rgba(124, 138, 255, 0.5);
  transform: scale(1.1);
}

/* === PLACEHOLDER SECTIONS 4 & 5 === */
.placeholder-section {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.placeholder-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-style: italic;
  text-shadow: 0 1px 8px rgba(0,0,0,0.5);
}

/* === TIMETABLE === */
.timetable-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}

.timetable-wrapper::-webkit-scrollbar {
  height: 6px;
}

.timetable-wrapper::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: 3px;
}

.timetable {
  width: 100%;
  border-collapse: separate;
  border-spacing: 4px;
  min-width: 600px;
}

.timetable th,
.timetable td {
  padding: 12px 10px;
  text-align: center;
  border-radius: 8px;
  vertical-align: middle;
}

.timetable thead th {
  background: rgba(124, 138, 255, 0.15);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  border: 1px solid rgba(124, 138, 255, 0.2);
}

.timetable tbody td {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-height: 60px;
}

.timetable tbody td.tt-time {
  background: rgba(255, 255, 255, 0.08);
  white-space: nowrap;
  min-width: 90px;
}

.tt-slot {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.tt-hour {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.timetable tbody td.tt-has-course {
  background: rgba(124, 138, 255, 0.1);
  border: 1px solid rgba(124, 138, 255, 0.18);
}

.tt-course-name {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.tt-course-room {
  font-size: 0.75rem;
  color: var(--accent);
  opacity: 0.85;
}

.timetable tbody td.tt-has-course {
  transition: all 0.3s ease;
}

.timetable tbody td.tt-cell-active {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .page-title h1 {
    font-size: 1.6rem;
  }

  .nav-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .nav-item {
    padding: 14px 8px;
  }

  .nav-item .nav-name {
    font-size: 0.82rem;
  }

  .nav-item .nav-url {
    font-size: 0.65rem;
  }

  .section-content {
    padding: 40px 16px;
  }

  .glass-card {
    padding: 20px 16px;
  }

  .calendar-grid .cal-day {
    font-size: 0.78rem;
  }

  .memo-type-buttons {
    gap: 6px;
  }

  .memo-type-btn {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  .site-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .timetable {
    min-width: 520px;
  }

  .timetable th,
  .timetable td {
    padding: 8px 6px;
    font-size: 0.75rem;
  }

  .tt-course-name {
    font-size: 0.78rem;
  }

  .tt-course-room {
    font-size: 0.68rem;
  }
}

/* === SCROLLBAR FOR MEMO PANEL === */
.day-memos {
  max-height: 200px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}

/* === FADE-IN ANIMATION === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === LOADING SKELETON === */
.loading-skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.04) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 8px;
  height: 40px;
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}