/* ============================================
   PHOENIX ACCOUNTING GROUP - Responsive CSS
   Breakpoints: tablet 1024px / mobile 768px / sm 480px
   ============================================ */

/* ─── Tablet (≤1024px) ─── */
@media (max-width: 1024px) {

  :root {
    --nav-height: 70px;
    --container-pad: clamp(1rem, 4vw, 2.5rem);
  }

  /* Nav */
  .nav-menu { gap: 0; }
  .nav-link { padding: var(--space-2) var(--space-3); font-size: 0.78rem; }

  /* Grids */
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }

  /* Home */
  .mission-grid   { grid-template-columns: 1fr; gap: var(--space-12); }
  .origin-grid    { grid-template-columns: 1fr; gap: var(--space-10); }
  .principles-grid { grid-template-columns: repeat(3, 1fr); }
  .network-grid   { grid-template-columns: repeat(2, 1fr); }
  .services-grid  { grid-template-columns: repeat(4, 1fr); }

  /* Professional */
  .professionals-list { grid-template-columns: repeat(3, 1fr); }

  /* Recruit */
  .message-grid { grid-template-columns: 1fr 2fr; }

  /* Contact */
  .contact-layout { grid-template-columns: 1fr; gap: var(--space-10); }
}

/* ─── Mobile (≤768px) ─── */
@media (max-width: 768px) {

  :root {
    --nav-height: 60px;
    /* スクロール時もヘッダーの高さを変えない。高さが変わると、下に開く
       メニューパネルの上端とヘッダーの下端がずれてしまうため。 */
    --nav-height-scrolled: 60px;
    --container-pad: 1.25rem;
  }

  /* ── ★重要：スマホではヘッダーの backdrop-filter（背景ぼかし）を無効化 ──
     ページを下にスクロールすると #site-nav に .nav-scrolled が付き、
     backdrop-filter: blur(20px) が効きます。backdrop-filter が付いた要素は、
     その子孫の position:fixed の位置基準（包含ブロック）になってしまいます。
     .nav-menu は position:fixed / inset:0 で「画面いっぱい」に開く設計ですが、
     この影響で「高さ60pxのヘッダーいっぱい」になり、パネルの高さがほぼ0に
     潰れます。＝ページ下部でハンバーガーを押してもメニューが開かない原因。
     スマホではぼかしを使わず、ほぼ不透明の背景色で代用します。 */
  #site-nav,
  #site-nav.nav-scrolled {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  #site-nav.nav-scrolled {
    background: rgba(6, 15, 32, 0.98);
  }

  /* メニューを開いている間、後ろのページが動かないようにする（任意） */
  body.nav-open {
    overflow: hidden;
  }

  /* ── Nav: logo must shrink so it never pushes the hamburger
         button off-screen on narrow phones. Text is sized small
         enough to always fit on one line -- never clipped/ellipsized,
         so the full brand name stays readable. ── */
  .nav-logo {
    flex-shrink: 1;
    min-width: 0;
    gap: 6px;
  }

  .nav-logo img {
    height: 28px;
    width: auto;
    flex-shrink: 0;
  }

  .nav-logo-text {
    min-width: 0;
  }

  .nav-logo-name {
    font-size: 8px;
    letter-spacing: 0.3px;
    white-space: nowrap;
  }

  .nav-logo-sub {
    display: none;
  }

  /* ── Nav: hamburger ── */
  .nav-menu {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--nav-height);
    background: var(--color-navy-dark);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--container-pad);
    gap: 0;
    overflow-y: auto;
    z-index: var(--z-overlay);
    border-top: 1px solid rgba(201,168,76,0.15);
  }

  .nav-menu.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .nav-item { width: 100%; }

  .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-base);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    border-radius: 0;
  }

  .nav-link--cta {
    margin-top: var(--space-4);
    text-align: center;
    border-radius: var(--radius-sm) !important;
    border-bottom: none;
  }

  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: rgba(255,255,255,0.04);
    border: none;
    border-radius: 0;
    padding-left: var(--space-4);
  }

  /* The desktop hover/focus rule below has higher specificity than the
     plain .nav-dropdown rule above, so on mobile a tap-triggered focus
     (:focus-within) was re-applying translateX(-50%), shoving the panel
     half its own width off the left edge of the screen. Cancel it here. */
  .nav-item:hover .nav-dropdown,
  .nav-item:focus-within .nav-dropdown {
    transform: none;
  }

  /* Hamburger toggle */
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    cursor: pointer;
    padding: 0;
    background: none;
    border: none;
    flex-shrink: 0;
  }

  .nav-toggle span {
    display: block;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
  }

  .nav-toggle.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

  /* Hero */
  #hero { min-height: 560px; }

  .hero-title {
    font-size: clamp(1.8rem, 8vw, 2.6rem) !important;
    letter-spacing: -0.02em;
  }

  .hero-desc  { font-size: var(--text-base); }
  .hero-actions { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
  .hero-geo-ring  { display: none; }
  .hero-geo-diamond { display: none; }
  .hero-scroll  { display: none; }

  /* Page header */
  .page-header { padding: calc(var(--nav-height) + 3rem) 0 2.5rem; }
  .page-header h1 { font-size: clamp(1.8rem, 6vw, 2.8rem) !important; }

  /* Section titles */
  .section-title { font-size: clamp(1.4rem, 5vw, 1.8rem); }

  /* News */
  .home-news-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .home-news-label { position: static; }

  /* Mission */
  .mission-grid   { grid-template-columns: 1fr; }
  .mission-visual { aspect-ratio: 16/9; }
  .mission-visual-placeholder { aspect-ratio: 16/9; }

  /* Philosophy */
  .philosophy-item {
    grid-template-columns: 40px 1fr;
    gap: var(--space-4);
    padding: var(--space-5);
  }

  /* Origin */
  .origin-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .origin-logo-display { width: 200px; height: 200px; margin: 0 auto; }
  .origin-logo-wrap { order: -1; }

  /* Principles */
  .principles-grid { grid-template-columns: 1fr 1fr; gap: var(--space-4); }

  /* Network */
  .network-grid { grid-template-columns: 1fr; }
  .offices-grid { grid-template-columns: 1fr; }

  /* Services */
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .service-tile { aspect-ratio: 4/3; }

  /* Service detail accordion list — had no mobile rules at all, so the
     desktop-sized 4-column grid (80px num / 44px icon / title / 32px
     toggle, with space-6/space-8 gaps+padding) stayed full-size and
     just kept stacking full-height rows down the page. Shrink it. */
  .services-detail {
    margin-top: var(--space-12);
    gap: var(--space-3);
  }

  .service-detail-header {
    grid-template-columns: 32px 36px 1fr 26px;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  .service-detail-num {
    font-size: var(--text-base);
  }

  .service-detail-icon {
    width: 36px;
    height: 36px;
  }

  .service-detail-icon svg {
    width: 18px;
    height: 18px;
  }

  .service-detail-title {
    font-size: var(--text-sm);
    line-height: var(--leading-snug);
  }

  .service-detail-toggle {
    width: 26px;
    height: 26px;
  }

  /* Professionals */
  .professionals-list { grid-template-columns: repeat(2, 1fr); }

  /* Modal */
  .modal-header {
    grid-template-columns: 120px 1fr auto;
    gap: var(--space-4);
    padding: var(--space-5);
  }
  .modal-header-img,
  .modal-header-img-ph { width: 120px; height: 160px; }
  .modal-name-jp { font-size: var(--text-xl); }

  /* Recruit */
  .recruit-type-grid { grid-template-columns: 1fr; }
  .message-grid     { grid-template-columns: 1fr; }
  .message-portrait-ph { aspect-ratio: 3/2; }

  /* Contact */
  .contact-layout   { grid-template-columns: 1fr; }
  .form-row         { grid-template-columns: 1fr; }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  /* Buttons */
  .btn { font-size: 0.78rem; padding: var(--space-3) var(--space-6); }

  /* Scroll top */
  .scroll-top { bottom: var(--space-5); right: var(--space-5); width: 42px; height: 42px; }
}

/* ─── Small Mobile (≤480px) ─── */
@media (max-width: 480px) {

  /* Slightly smaller still on the narrowest phones */
  .nav-logo-name { font-size: 7.2px; letter-spacing: 0.2px; }
  .nav-logo img { height: 24px; }

  .hero-title { font-size: clamp(1.6rem, 7vw, 2.2rem) !important; }

  .professionals-list { grid-template-columns: 1fr 1fr; }

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

  .principles-grid { grid-template-columns: 1fr; gap: var(--space-3); }

  .modal-header { grid-template-columns: 1fr auto; gap: var(--space-3); }
  .modal-header-img,
  .modal-header-img-ph { display: none; }

  .service-detail-header {
    grid-template-columns: 36px 1fr 24px;
    padding: var(--space-3);
  }
  .service-detail-num { display: none; }

  .filter-tabs { gap: var(--space-1); }
  .filter-tab  { font-size: 10px; padding: var(--space-1) var(--space-3); }
}

/* ─── Hamburger JS hook ─── */
/* js/main.js toggles .open on .nav-toggle and .nav-menu */