:root {
      --accent: #d84f8d;
      --accent-dark: #9f245f;
      --accent-soft: #ffe4f0;
      --accent-pale: #fff5fa;
      --bg: #fff8fb;
      --card: #ffffff;
      --line: #f2bfd6;
      --text: #2f2430;
      --muted: #725f6a;
      --lesson: #ffd7e8;
      --lesson-border: #d84f8d;
      --danger: #b00045;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
      line-height: 1.65;
      color: var(--text);
      background:
        radial-gradient(circle at top left, #ffe8f3 0, transparent 28rem),
        linear-gradient(180deg, #fff8fb 0%, #fff 60%, #fff8fb 100%);
    }
    .wrap {
      max-width: 1080px;
      margin: 0 auto;
      padding: 24px 16px 44px;
    }
    header {
      text-align: center;
      margin-bottom: 18px;
    }
    h1 {
      font-size: clamp(1.35rem, 3vw, 2rem);
      margin: 0 0 6px;
      letter-spacing: .04em;
      color: var(--accent-dark);
    }
    .lead {
      color: var(--muted);
      margin: 0 auto;
      max-width: 760px;
      font-size: .95rem;
    }
    .login-card,
    .controls {
      margin: 20px auto 24px;
      background: rgba(255,255,255,.94);
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 18px;
      display: grid;
      gap: 13px;
      box-shadow: 0 8px 24px rgba(216,79,141,.12);
    }
    .login-card {
      max-width: 560px;
    }
    .login-title {
      margin: 0;
      text-align: center;
      color: var(--accent-dark);
      font-size: 1.08rem;
      font-weight: 800;
    }
    .form-row {
      display: grid;
      gap: 6px;
    }
    .control-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
      justify-content: center;
    }
    label {
      font-weight: 700;
      color: var(--accent-dark);
    }
    select,
    input[type="password"],
    button,
    .button-link {
      font: inherit;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: #fff;
      padding: 10px 14px;
      min-height: 44px;
    }
    select,
    input[type="password"] {
      width: 100%;
      outline-color: var(--accent);
    }
    button,
    .button-link {
      cursor: pointer;
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
      font-weight: 800;
      box-shadow: 0 3px 10px rgba(216,79,141,.20);
    }
    button.secondary,
    .button-link.secondary {
      background: #fff;
      color: var(--accent-dark);
      border-color: var(--line);
      box-shadow: none;
    }
    button:hover,
    .button-link:hover {
      filter: brightness(.98);
    }
    .button-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      min-width: 9em;
    }
    .message {
      text-align: center;
      min-height: 1.6em;
      font-weight: 700;
    }
    .message.error { color: var(--danger); }
    .message.ok { color: var(--accent-dark); }
    .summary {
      text-align: center;
      font-weight: 800;
      color: var(--accent-dark);
      min-height: 1.6em;
    }
    .months {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 16px;
    }
    .month {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 6px 20px rgba(216,79,141,.10);
    }
    .month h2 {
      margin: 0;
      padding: 9px 12px;
      background: linear-gradient(90deg, #f6b5d2, #ffd7e8);
      color: var(--accent-dark);
      font-size: 1rem;
      text-align: center;
      border-bottom: 1px solid var(--line);
      letter-spacing: .04em;
    }
    .week,
    .days {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
    }
    .week div {
      padding: 6px 0;
      text-align: center;
      font-size: .82rem;
      border-bottom: 1px solid var(--line);
      color: var(--muted);
      background: var(--accent-pale);
    }
    .week div:first-child { color: #c63a74; }
    .day {
      min-height: 42px;
      padding: 4px;
      border-right: 1px solid #f6dbe7;
      border-bottom: 1px solid #f6dbe7;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #c9a7b6;
      font-size: .9rem;
    }
    .day:nth-child(7n) { border-right: none; }
    .day.blank { background: #fffafd; }
    .day.lesson {
      background: var(--lesson);
      color: var(--accent-dark);
      font-weight: 900;
      outline: 2px solid var(--lesson-border);
      outline-offset: -2px;
      position: relative;
    }
    .day.lesson::after {
      content: "♪";
      position: absolute;
      right: 5px;
      bottom: 2px;
      font-size: .75rem;
      color: var(--accent);
      opacity: .85;
    }
    .day.hidden-date {
      color: transparent;
      background: #fff;
    }
    .note {
      margin-top: 18px;
      color: var(--muted);
      font-size: .88rem;
      text-align: center;
    }
    .is-hidden { display: none !important; }
    @media print {
      body { background: #fff; }
      .login-card, .controls { display: none; }
      .wrap { max-width: none; padding: 8mm; }
      .months { grid-template-columns: repeat(3, 1fr); gap: 8px; }
      .month { box-shadow: none; break-inside: avoid; }
    }