/* =========================================================
   KITT Study
   responsive.css v1.0
   ---------------------------------------------------------
   Purpose:
   - Tablet / Smartphone
   - Header / Navigation
   - CTA
   - Grid / Split layouts
   - Footer
   - Forms
   - Spacing
   ========================================================= */


/* ---------------------------------------------------------
   1. Tablet
   1024px 以下
   --------------------------------------------------------- */

@media (max-width: 1024px) {

  :root {
    --layout-gutter: 20px;
    --section-space: 64px;
    --section-space-small: 40px;
  }


  /* Header */

  .site-header__inner {
    gap: 16px;
  }

  .header-nav__list {
    gap: 16px;
  }

  .header-nav__link {
    font-size: 14px;
  }


  /* Grid */

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }


  /* Footer */

  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px 32px;
  }


  /* Split */

  .split {
    gap: 32px;
  }
}


/* ---------------------------------------------------------
   2. Smartphone / Tablet portrait
   768px 以下
   --------------------------------------------------------- */

@media (max-width: 768px) {

  :root {
    --layout-gutter: 18px;

    --section-space: 48px;
    --section-space-small: 32px;

    --header-height: 64px;

    --font-size-h1: clamp(28px, 8vw, 38px);
    --font-size-h2: clamp(22px, 6vw, 28px);
    --font-size-h3: 19px;
  }


  /* -------------------------------------------------------
     Header
     ------------------------------------------------------- */

  .site-header__inner {
    min-height: var(--header-height);

    gap: 12px;
  }

  .site-header__brand {
    position: relative;
    z-index: 110;
  }


  /*
   * PC用ナビゲーションは非表示。
   * menu-open クラスは JavaScript 側で切り替える。
   */

  .site-header__nav {
    position: fixed;

    top: 0;
    right: 0;

    width: min(86vw, 360px);
    height: 100dvh;

    display: block;

    padding:
      calc(var(--header-height) + 24px)
      24px
      32px;

    background: #ffffff;

    overflow-y: auto;

    transform: translateX(100%);
    visibility: hidden;

    transition:
      transform 0.25s ease,
      visibility 0.25s ease;

    z-index: 100;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }


  /* Navigation list */

  .header-nav__list {
    display: block;
  }

  .header-nav__item {
    border-bottom: 1px solid var(--color-border);
  }

  .header-nav__link {
    width: 100%;
    min-height: 52px;

    display: flex;
    align-items: center;

    font-size: 16px;
  }


  /* Header CTA */

  .site-header__cta {
    margin-left: auto;
  }

  .header-cta {
    min-height: 40px;
    padding: 8px 12px;

    font-size: 13px;
  }


  /* -------------------------------------------------------
     Hamburger button
     ------------------------------------------------------- */

  .menu-toggle {
    position: relative;
    z-index: 120;

    width: 44px;
    height: 44px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    padding: 0;

    background: transparent;
    border: 0;

    cursor: pointer;
  }

  .menu-toggle__icon,
  .menu-toggle__icon::before,
  .menu-toggle__icon::after {
    width: 24px;
    height: 2px;

    display: block;

    background: var(--color-heading);

    transition:
      transform 0.25s ease,
      opacity 0.25s ease;
  }

  .menu-toggle__icon {
    position: relative;
  }

  .menu-toggle__icon::before,
  .menu-toggle__icon::after {
    content: "";

    position: absolute;
    left: 0;
  }

  .menu-toggle__icon::before {
    top: -7px;
  }

  .menu-toggle__icon::after {
    top: 7px;
  }


  /* Hamburger open state */

  .menu-toggle[aria-expanded="true"]
  .menu-toggle__icon {
    background: transparent;
  }

  .menu-toggle[aria-expanded="true"]
  .menu-toggle__icon::before {
    top: 0;
    transform: rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"]
  .menu-toggle__icon::after {
    top: 0;
    transform: rotate(-45deg);
  }


  /* -------------------------------------------------------
     Menu overlay
     ------------------------------------------------------- */

  .menu-overlay {
    position: fixed;

    inset: 0;

    background: rgb(0 0 0 / 45%);

    opacity: 0;
    visibility: hidden;

    transition:
      opacity 0.25s ease,
      visibility 0.25s ease;

    z-index: 90;
  }

  .menu-overlay.is-open {
    opacity: 1;
    visibility: visible;
  }


  /* -------------------------------------------------------
     Main / Sections
     ------------------------------------------------------- */

  .page-main {
    padding-block: var(--section-space);
    font-size: 17px;
  line-height: 1.8;
}

  .section {
    padding-block: 30px;
  }


  /* -------------------------------------------------------
     Vertical flow
     ------------------------------------------------------- */

  .flow > * + * {
    margin-top: 20px;
  }

  .flow--large > * + * {
    margin-top: 32px;
  }


  /* -------------------------------------------------------
     Split layout
     ------------------------------------------------------- */

  .split {
    grid-template-columns: 1fr;
    gap: 32px;
  }


  /* -------------------------------------------------------
     Grid
     ------------------------------------------------------- */

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }


  /* -------------------------------------------------------
     CTA
     ------------------------------------------------------- */

  .cta {
    padding: 32px 20px;
  }

  .cta__title {
    font-size: 23px;
  }

  .cta__actions {
    flex-direction: column;
  }

  .cta__actions .button {
    width: 100%;
  }


  /* -------------------------------------------------------
     Buttons
     ------------------------------------------------------- */

  .button--large {
    min-height: 52px;

    padding: 14px 20px;

    font-size: 17px;
  }


  /* -------------------------------------------------------
     Cards
     ------------------------------------------------------- */

  .card {
    padding: 24px 20px;
  }


  /* -------------------------------------------------------
     Notices
     ------------------------------------------------------- */

  .notice {
    padding: 20px;
  }


  /* -------------------------------------------------------
     Page title
     ------------------------------------------------------- */

  .page-title {
    margin-bottom: 32px;
  }

  .page-title__lead {
    font-size: 17px;
    line-height: 1.8;
  }


  /* -------------------------------------------------------
     Steps
     ------------------------------------------------------- */

  .steps__item {
    padding:
      20px
      20px
      20px
      72px;
  }

  .steps__item::before {
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
  }


  /* -------------------------------------------------------
     Definition list
     ------------------------------------------------------- */

  .definition-list__row {
    grid-template-columns: 1fr;

    gap: 8px;
  }


  /* -------------------------------------------------------
     Forms
     ------------------------------------------------------- */

  .form__group {
    margin-bottom: 24px;
  }

  .form__actions {
    flex-direction: column;
  }

  .form__actions .button {
    width: 100%;
  }


  /* -------------------------------------------------------
     Footer
     ------------------------------------------------------- */

  .site-footer__inner {
    padding-block: 48px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;

    gap: 32px;
  }

  .site-footer__bottom {
    margin-top: 40px;
  }

/* ---------------------------------------------------------
   tester ページ スマホ微調整
   --------------------------------------------------------- */

.page-title__heading {
  font-size: 2rem;
  line-height: 1.4;
}

.faq-actions {
  display: grid;
  gap: 10px;
}

.faq-actions .button {
  width: 100%;
}

}


/* ---------------------------------------------------------
   3. Small smartphone
   480px 以下
   --------------------------------------------------------- */

@media (max-width: 480px) {

  :root {
    --layout-gutter: 16px;

    --section-space: 40px;
    --section-space-small: 28px;
  }


  /* Header */

  .site-header__inner {
    gap: 8px;
  }

  .header-cta {
    padding: 8px 10px;

    font-size: 12px;
  }


  /* CTA */

  .cta {
    padding: 28px 16px;
  }


  /* Cards */

  .card {
    padding: 20px 16px;
  }


  /* Notice */

  .notice {
    padding: 18px 16px;
  }


  /* Forms */

  .form input[type="text"],
  .form input[type="email"],
  .form input[type="tel"],
  .form input[type="url"],
  .form input[type="password"],
  .form input[type="number"],
  .form select,
  .form textarea {
    font-size: 16px;
  }


  /* Buttons */

  .button {
    width: 100%;
  }
}


/* ---------------------------------------------------------
   4. Reduced motion
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;

    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* =========================================================
   Limited Tester Application Form - Mobile
   ========================================================= */

@media (max-width: 767px) {

  .tester-form {
    margin-top: 1.5rem;
  }

  .form-section {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    border-radius: 12px;
  }

  .form-section legend {
    font-size: 1.1rem;
  }

  .form-group {
    margin-top: 1.25rem;
  }

  .form-input {
    min-height: 48px;
    font-size: 16px;
  }

  .form-choice-group {
    flex-direction: column;
  }

  .form-choice {
    width: 100%;
    min-width: 0;
  }

  .form-check {
    gap: 0.65rem;
  }

  .form-actions {
    margin-top: 2rem;
  }

  .form-actions .button {
    width: 100%;
    min-width: 0;
  }

  .steps--flow .steps__item {
  align-items: start;
}

.steps--flow .steps__item::before {
  top: 20px;
  transform: none;
}
}

@media (max-width: 767px) {

  .faq-category-nav__list {
    display: grid;
    grid-template-columns: 1fr;
  }

  .faq-category-nav__list .button {
    width: 100%;
  }

  .faq-item__question {
    align-items: flex-start;
    padding: 1rem 3rem 1rem 1rem;
  }

  .faq-item__answer {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

}

/* =========================================================
   Support form - mobile
========================================================= */

@media (max-width: 767px) {

  .kitt-contact-form {
    max-width: none;
    margin-top: 1.5rem;
  }

  .kitt-contact-field {
    margin-bottom: 1.75rem;
  }

  .kitt-contact-field input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]),
  .kitt-contact-field select,
  .kitt-contact-field textarea {
    width: 100%;

    /*
     * iPhone Safariの入力時自動ズーム防止
     */
    font-size: 16px;
  }

  .kitt-contact-field textarea {
    min-height: 130px;
  }

  .kitt-contact-privacy {
    padding: 1rem;
  }

  .kitt-contact-submit {
    width: 100%;
    min-width: 0;
  }

}