/* ==========================================================================
   sign_in_2026.css
   --------------------------------------------------------------------------
   2026年度版 サインイン画面 専用スタイル。
   - 採用デザイン: design-system/プロトタイプ/sign-in-ds-violet.html（DS適用案）
   - 既存 mp_base.css の `.size_maipaso` / `.taikaimei` / `.bumonmei` / `.btn_hover`
     等は他画面（select_bumon, sign_out, user_renew, user_regstration ほか）が
     共有しているため変更しない。本画面は新クラス（`sign-in-2026__*`）に
     差し替える。
   - 含めるフォント: Google Fonts CDN
     (M PLUS Rounded 1c, BIZ UDPGothic, JetBrains Mono, Kosugi Maru)
     → sign_in.html 側で `<link>` を追加。
   - フォーム属性 (`name="user_id"`, `name="pass"`, `name="token"`,
     `action="?mode=select_bumon"`) は既存のロジック (auth() / generate_token())
     互換のため維持。
   ========================================================================== */

/* ===== トークン（DS）：本ファイル内ローカルとして閉じる ===== */
.sign-in-2026 {
  --color-primary:        #7C3AED;
  --color-primary-light:  #9F67F0;
  --color-primary-dark:   #6129D3;
  --color-secondary:      #14B8A6;
  --color-error:          #EF4444;
  --color-error-bg:       #FEE2E2;
  --color-html:           #3B82F6;
  --color-css:            #10B981;
  --color-js:             #F59E0B;

  --color-white:          #FFFFFF;
  --color-gray-100:       #F1F5F9;
  --color-gray-200:       #E2E8F0;
  --color-gray-300:       #CBD5E1;
  --color-gray-400:       #94A3B8;
  --color-gray-500:       #64748B;
  --color-gray-600:       #475569;
  --color-gray-700:       #334155;
  --color-gray-800:       #1E293B;
  --color-gray-900:       #0F172A;

  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.10);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.10);

  --ring-primary: 0 0 0 4px rgba(124, 58, 237, 0.18);

  --transition-base: 200ms ease-in-out;
  --transition-fast: 150ms ease-in-out;

  --font-main:   'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
  --font-ui:     'BIZ UDPGothic', 'Noto Sans JP', sans-serif;
  --font-code:   'JetBrains Mono', 'Source Code Pro', monospace;
  --font-accent: 'Kosugi Maru', 'Noto Sans JP', sans-serif;
}

/* ===== 外枠（1024×660 の画面に揃える） ===== */
.sign-in-2026__container {
  position: relative;
  width: 1024px;
  height: 660px;
  margin: 0 auto;
  background:
    radial-gradient(circle at 15% 20%, rgba(159, 103, 240, 0.35), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(20, 184, 166, 0.25), transparent 45%),
    linear-gradient(135deg, #EDE9FE 0%, #DDD6FE 50%, #C4B5FD 100%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: flex;
  flex-direction: row;
  align-items: stretch;
  overflow: hidden;
  font-family: var(--font-main);
  color: var(--color-gray-800);
  line-height: 1.6;
  box-sizing: border-box;
}
.sign-in-2026__container *,
.sign-in-2026__container *::before,
.sign-in-2026__container *::after {
  box-sizing: border-box;
}

/* ===== 浮かぶ言語タグ（HTML / CSS / JS） ===== */
.sign-in-2026__floating-tag {
  position: absolute;
  font-family: var(--font-code);
  font-weight: 600;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow-md);
  color: var(--color-gray-800);
  user-select: none;
}
.sign-in-2026__floating-tag .dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}
/* 「パソ検 プログラミング」の真下に横一列で配置 */
.sign-in-2026__floating-tag--html { top: 100px; left: 86px;  color: var(--color-html); }
.sign-in-2026__floating-tag--css  { top: 100px; left: 162px; color: var(--color-css);  }
.sign-in-2026__floating-tag--js   { top: 100px; left: 226px; color: var(--color-js);   }
.sign-in-2026__floating-tag--html .dot { background: var(--color-html); }
.sign-in-2026__floating-tag--css  .dot { background: var(--color-css);  }
.sign-in-2026__floating-tag--js   .dot { background: var(--color-js);   }

/* ===== 左：ブランドペイン ===== */
.sign-in-2026__brand-pane {
  flex: 0 0 460px;
  position: relative;
  padding: 56px 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--color-gray-800);
}

.sign-in-2026__brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-accent);
  font-weight: 400;
  color: var(--color-primary-dark);
  font-size: 14px;
  letter-spacing: 0.06em;
}
.sign-in-2026__brand-mark__logo {
  width: 28px; height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.sign-in-2026__brand-mark__logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.sign-in-2026__brand-headings {
  margin-top: 64px;
}
.sign-in-2026__taikaimei {
  font-family: var(--font-main);
  font-size: 32px;
  font-weight: 800;
  color: var(--color-gray-900);
  line-height: 1.25;
  margin: 0;
}
.sign-in-2026__bumonmei {
  margin-top: 12px;
  font-family: var(--font-main);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
}
.sign-in-2026__bumonmei .year {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 12px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 999px;
  font-size: 14px;
  font-family: var(--font-code);
  font-weight: 500;
  letter-spacing: 0.04em;
  vertical-align: middle;
}
.sign-in-2026__brand-tagline {
  margin-top: 18px;
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--color-gray-700);
  line-height: 1.7;
  max-width: 320px;
}

.sign-in-2026__syusaihoka {
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-gray-600);
  letter-spacing: 0.06em;
}

/* ===== 右：サインインカード ===== */
.sign-in-2026__signin-pane {
  flex: 1 1 auto;
  padding: 32px 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sign-in-2026__signin-card {
  width: 100%;
  max-width: 420px;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 32px 36px 28px;
}
.sign-in-2026__signin-card__heading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-gray-900);
  margin: 0 0 6px;
  line-height: 1;
}
.sign-in-2026__signin-card__heading::before {
  content: "";
  width: 6px;
  height: 22px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}
.sign-in-2026__signin-card__sub {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--color-gray-500);
  margin: 0 0 18px 16px;
}

/* ===== エラー表示 ===== */
.sign-in-2026__alert-error {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-error-bg);
  color: #B91C1C;
  border: 1px solid #FCA5A5;
  border-radius: var(--radius-md);
  font-size: 13px;
  padding: 10px 12px;
  margin-bottom: 16px;
  font-family: var(--font-ui);
}
/* メッセージが空の場合は非表示（既存 #msg_str への JS 互換のため inline:none 切替も可） */
.sign-in-2026__alert-error:empty {
  display: none;
}

/* ===== フォーム要素 ===== */
.sign-in-2026__form-row {
  margin-bottom: 14px;
}
.sign-in-2026__form-row:last-of-type {
  margin-bottom: 18px;
}
.sign-in-2026__id-pw-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-gray-700);
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}
.sign-in-2026__eye-toggle {
  cursor: pointer;
  color: var(--color-gray-500);
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background var(--transition-fast), color var(--transition-fast);
  user-select: none;
}
.sign-in-2026__eye-toggle:hover {
  color: var(--color-primary);
  background: rgba(124, 58, 237, 0.10);
}

.sign-in-2026__input {
  width: 100%;
  height: 44px;
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 0 14px;
  font-size: 15px;
  font-family: var(--font-main);
  color: var(--color-gray-900);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}
.sign-in-2026__input::placeholder {
  color: var(--color-gray-400);
  font-family: var(--font-code);
}
.sign-in-2026__input:hover {
  border-color: var(--color-gray-300);
}
.sign-in-2026__input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--ring-primary);
}

/* ===== サインインボタン ===== */
.sign-in-2026__btn-submit {
  width: 100%;
  height: 48px;
  color: #fff;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 15px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  letter-spacing: 0.08em;
  box-shadow: 0 8px 18px -6px rgba(124, 58, 237, 0.55);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  -webkit-appearance: none;
}
.sign-in-2026__btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px -8px rgba(124, 58, 237, 0.55);
}
.sign-in-2026__btn-submit:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px -3px rgba(124, 58, 237, 0.55);
}
.sign-in-2026__btn-submit:focus-visible {
  outline: none;
  box-shadow: var(--ring-primary), 0 8px 18px -6px rgba(124, 58, 237, 0.55);
}
.sign-in-2026__btn-submit:disabled,
.sign-in-2026__btn-submit.is-disabled {
  background: var(--color-gray-300);
  color: var(--color-white);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
  opacity: 0.85;
}

/* ===== サブリンク ===== */
.sign-in-2026__sub-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  font-family: var(--font-ui);
  font-size: 12px;
}
.sign-in-2026__sub-links a {
  color: var(--color-primary-dark);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary-dark);
  padding-bottom: 1px;
  transition: color var(--transition-fast);
}
.sign-in-2026__sub-links a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}