:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #20263a;
  --sub: #687086;
  --border: #dfe3ee;
  --primary: #5b5ce2;
  --primary-dark: #4546ba;
  --danger: #d9384c;
  --success: #178648;

  --work: #ff875f;
  --school: #5798ed;
  --task: #a66ce3;
  --play: #38b97d;
  --circle: #ed71aa;
  --other: #9aa4b5;

  --shadow: 0 10px 30px rgba(42, 49, 80, 0.1);
}

body.dark {
  --bg: #141827;
  --card: #202638;
  --text: #f3f5fa;
  --sub: #b6bed0;
  --border: #394259;
  --primary: #9898ff;
  --primary-dark: #b5b5ff;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

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

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* 読み込み画面 */
.loading-screen,
.error-screen {
  display: grid;
  min-height: 100vh;
  padding: 24px;
  place-content: center;
  text-align: center;
}

.spinner {
  width: 42px;
  height: 42px;
  margin: 0 auto 16px;
  border: 4px solid #d8d9ff;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: rotate 0.8s linear infinite;
}

@keyframes rotate {
  to {
    transform: rotate(360deg);
  }
}

/* ログイン画面 */
.auth-page {
  display: grid;
  min-height: 100vh;
  padding: 20px;
  background:
    radial-gradient(circle at top left, #d8d9ff, transparent 42%),
    radial-gradient(circle at bottom right, #ffd9ed, transparent 42%),
    var(--bg);
  place-items: center;
}

.auth-card {
  width: min(100%, 430px);
  padding: 34px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.logo {
  margin-bottom: 22px;
  font-size: 24px;
  font-weight: 800;
  text-align: center;
}

.auth-card h1 {
  margin: 0;
  font-size: 23px;
  text-align: center;
}

.auth-card > p {
  margin: 10px 0 24px;
  color: var(--sub);
  text-align: center;
}

.form-group {
  display: grid;
  gap: 7px;
  margin-bottom: 15px;
}

.form-group label {
  font-size: 14px;
  font-weight: 700;
}

input,
select {
  width: 100%;
  padding: 12px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91, 92, 226, 0.16);
}

.primary-button,
.secondary-button {
  padding: 12px 16px;
  font-weight: 700;
  border-radius: 9px;
}

.primary-button {
  width: 100%;
  color: white;
  background: var(--primary);
  border: none;
}

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

.secondary-button {
  color: var(--primary);
  background: transparent;
  border: 1px solid var(--primary);
}

.text-button {
  padding: 0;
  color: var(--primary);
  font-weight: 700;
  background: none;
  border: none;
}

.auth-switch {
  margin-top: 20px !important;
  font-size: 14px;
}

.message {
  display: none;
  margin-top: 15px;
  padding: 11px;
  font-size: 13px;
  border-radius: 8px;
}

.message.show {
  display: block;
}

.message.error {
  color: #a21c2c;
  background: #ffe9ec;
}

.message.success {
  color: #166d3b;
  background: #e1f8eb;
}

/* アプリ画面 */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  z-index: 10;
  display: flex;
  flex-direction: column;
  width: 230px;
  min-height: 100vh;
  padding: 24px 16px;
  background: var(--card);
  border-right: 1px solid var(--border);
}

.sidebar .logo {
  margin-bottom: 28px;
  font-size: 19px;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav-button {
  width: 100%;
  padding: 12px;
  color: var(--sub);
  text-align: left;
  background: transparent;
  border: none;
  border-radius: 9px;
}

.nav-button:hover,
.nav-button.active {
  color: var(--primary);
  font-weight: 700;
  background: #ebebff;
}

body.dark .nav-button:hover,
body.dark .nav-button.active {
  background: #313856;
}

.sidebar-bottom {
  display: grid;
  gap: 9px;
  margin-top: auto;
}

.user-email {
  padding: 11px 4px;
  overflow: hidden;
  color: var(--sub);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-top: 1px solid var(--border);
}

.small-button {
  padding: 9px;
  color: var(--sub);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.main {
  width: 100%;
  max-width: 1450px;
  margin-left: 230px;
  padding: 32px;
}

.header {
  display: flex;
  gap: 15px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 25px;
}

.header h1 {
  margin: 0;
  font-size: 27px;
}

.header p {
  margin: 7px 0 0;
  color: var(--sub);
}

.date-label {
  padding: 10px 13px;
  color: var(--sub);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 9px;
}

.home-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(400px, 1.2fr);
  gap: 24px;
}

.card {
  padding: 23px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 20px;
  font-size: 18px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.full {
  grid-column: 1 / -1;
}

.preview {
  padding: 11px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  background: #eeeeff;
  border-radius: 8px;
}

body.dark .preview {
  background: #303856;
}

.schedule-list {
  display: grid;
  gap: 11px;
}

.schedule-item {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 13px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 5px solid var(--other);
  border-radius: 9px;
}

.schedule-time {
  min-width: 100px;
  color: var(--sub);
  font-size: 13px;
  font-weight: 700;
}

.schedule-info {
  flex: 1;
  min-width: 0;
}

.schedule-title {
  overflow: hidden;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.schedule-meta {
  margin-top: 4px;
  color: var(--sub);
  font-size: 12px;
}

.delete-button {
  color: var(--danger);
  background: transparent;
  border: none;
}

.empty {
  padding: 34px 10px;
  color: var(--sub);
  text-align: center;
}

/* カレンダー */
.calendar-controls {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.month-title {
  min-width: 165px;
  margin: 0;
  text-align: center;
}

.icon-button {
  width: 38px;
  height: 38px;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.weekdays,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.weekdays div {
  padding: 9px 3px;
  color: var(--sub);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}

.calendar-day {
  min-height: 115px;
  padding: 7px;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

.calendar-day:nth-child(7n) {
  border-right: 1px solid var(--border);
}

.calendar-day:nth-last-child(-n + 7) {
  border-bottom: 1px solid var(--border);
}

.muted {
  opacity: 0.45;
}

.day-number {
  display: inline-grid;
  width: 26px;
  height: 26px;
  margin-bottom: 4px;
  font-size: 13px;
  border-radius: 50%;
  place-items: center;
}

.today {
  color: white;
  font-weight: 700;
  background: var(--primary);
}

.calendar-event {
  display: block;
  width: 100%;
  margin: 3px 0;
  padding: 4px;
  overflow: hidden;
  color: var(--text);
  font-size: 11px;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: var(--bg);
  border: none;
  border-left: 4px solid var(--other);
  border-radius: 4px;
}

.toast {
  position: fixed;
  z-index: 99;
  right: 20px;
  bottom: 20px;
  max-width: 360px;
  padding: 13px 16px;
  color: white;
  background: #273044;
  border-radius: 9px;
  box-shadow: var(--shadow);
}

.toast.error {
  background: var(--danger);
}

.toast.success {
  background: var(--success);
}

@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    bottom: 0;
    flex-direction: row;
    width: 100%;
    min-height: 68px;
    height: 68px;
    padding: 8px;
    border-top: 1px solid var(--border);
    border-right: none;
  }

  .sidebar .logo,
  .sidebar-bottom {
    display: none;
  }

  .nav {
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .nav-button {
    text-align: center;
  }

  .main {
    margin-left: 0;
    padding: 23px 16px 90px;
  }

  .home-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .header {
    align-items: flex-start;
    flex-direction: column;
  }

  .date-label {
    width: 100%;
    text-align: center;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .full {
    grid-column: auto;
  }

  .card {
    padding: 17px;
  }

  .calendar-day {
    min-height: 74px;
    padding: 3px;
  }

  .calendar-event {
    font-size: 9px;
  }

  .weekdays div {
    font-size: 11px;
  }
}