/* ==========================================================================
   Y.W.C.株式会社 IT事業LP デモ - 共通ベーススタイル
   3案共通のリセット・変数・レイアウト基盤・共通コンポーネント
   ========================================================================== */

:root {
  /* --- ブランドカラー（既存コーポレートサイト準拠） --- */
  --ywc-black: #111111;
  --ywc-red: #E3201E;
  --ywc-red-dark: #B71917;
  --ywc-red-soft: #FDEBEA;
  --ywc-white: #FFFFFF;
  --ywc-gray-bg: #F4F4F5;
  --ywc-gray-bg-2: #ECECED;
  --ywc-line: #E0E0E1;
  --ywc-text: #212121;
  --ywc-text-sub: #5B5B5C;
  --ywc-text-mute: #85858A;

  /* --- タイポグラフィ --- */
  --font-base: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic Medium", "Yu Gothic", Meiryo, sans-serif;

  /* --- レイアウト --- */
  --max-width: 1080px;
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --shadow-card: 0 4px 20px rgba(17, 17, 17, 0.08);
  --shadow-cta: 0 8px 24px rgba(227, 32, 30, 0.28);
  --header-h: 60px;
}

/* --- リセット --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--ywc-text);
  background: var(--ywc-white);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  word-break: normal;
  overflow-wrap: break-word;
  line-break: strict;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font-family: inherit; cursor: pointer; }
main { display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container { padding: 0 32px; }
}

.section {
  padding: 56px 0;
}
@media (min-width: 768px) {
  .section { padding: 88px 0; }
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ywc-red);
  background: var(--ywc-red-soft);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: 0.01em;
}
@media (min-width: 768px) {
  .section-title { font-size: 32px; }
}

.section-lead {
  margin-top: 14px;
  color: var(--ywc-text-sub);
  font-size: 15px;
  line-height: 1.9;
}
@media (min-width: 768px) {
  .section-lead { font-size: 16px; }
}

.section-head {
  text-align: center;
  margin-bottom: 36px;
}
@media (min-width: 768px) {
  .section-head { margin-bottom: 52px; }
}

/* --- 視覚的に隠すが読み上げは可能（アクセシビリティ） --- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 8px; top: -48px;
  background: var(--ywc-black);
  color: var(--ywc-white);
  padding: 10px 16px;
  border-radius: var(--radius-s);
  z-index: 999;
  transition: top .2s ease;
}
.skip-link:focus { top: 8px; }

/* --- ヘッダー --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.96);
  -webkit-backdrop-filter: saturate(180%) blur(6px);
  backdrop-filter: saturate(180%) blur(6px);
  border-bottom: 1px solid var(--ywc-line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 15px;
  color: var(--ywc-black);
}
.brand-logo {
  display: block;
  width: auto;
  flex-shrink: 0;
}
.brand-sub {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--ywc-text-mute);
  letter-spacing: 0.02em;
}
.site-header .header-cta {
  display: none;
}
@media (min-width: 640px) {
  .site-header .header-cta { display: inline-flex; }
}

/* --- ボタン共通 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  border: 2px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-primary {
  background: var(--ywc-red);
  color: var(--ywc-white);
  box-shadow: var(--shadow-cta);
}
.btn-primary:hover { background: var(--ywc-red-dark); }
.btn-outline {
  background: transparent;
  border-color: var(--ywc-black);
  color: var(--ywc-black);
}
.btn-outline:hover { background: var(--ywc-black); color: var(--ywc-white); }
.btn-header {
  padding: 9px 18px;
  font-size: 13px;
}
.btn-block { width: 100%; }
.btn-lg { padding: 18px 32px; font-size: 17px; }
.btn-note {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--ywc-text-mute);
  text-align: center;
}

/* --- カード --- */
.card {
  background: var(--ywc-white);
  border: 1px solid var(--ywc-line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
}

/* --- 画像プレースホルダー（将来差し替え用） --- */
.img-placeholder {
  position: relative;
  background: linear-gradient(135deg, var(--ywc-gray-bg) 0%, var(--ywc-gray-bg-2) 100%);
  border: 1px dashed #C7C7C9;
  border-radius: var(--radius-m);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ywc-text-mute);
  font-size: 12.5px;
  text-align: center;
  padding: 12px;
  overflow: hidden;
  min-height: 120px;
}
.img-placeholder .ph-icon { width: 30%; max-width: 56px; margin: 0 auto 8px; color: #B9B9BC; }
.img-placeholder .ph-label { font-weight: 700; color: var(--ywc-text-mute); }

/* --- アイコン --- */
.icon {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --- FAQアコーディオン --- */
.faq-item {
  border-bottom: 1px solid var(--ywc-line);
}
.faq-item:first-child { border-top: 1px solid var(--ywc-line); }
.faq-q-h { margin: 0; font-size: inherit; font-weight: inherit; }
.faq-q {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 4px;
  text-align: left;
  font-weight: 700;
  font-size: 15px;
  color: var(--ywc-text);
}
.faq-q .faq-q-text {
  min-width: 0;
}
.faq-q .q-mark {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--ywc-black);
  color: var(--ywc-white);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800;
}
.faq-q .toggle-icon {
  margin-left: auto;
  transition: transform .2s ease;
  color: var(--ywc-text-mute);
  flex-shrink: 0;
}
.faq-item[data-open="true"] .toggle-icon { transform: rotate(135deg); }
.faq-a {
  overflow: hidden;
  max-height: 0;
  transition: max-height .25s ease;
}
.faq-a-inner {
  padding: 0 4px 22px 42px;
  color: var(--ywc-text-sub);
  font-size: 14.5px;
  line-height: 1.9;
}

/* --- フッター --- */
.site-footer {
  background: var(--ywc-black);
  color: rgba(255,255,255,0.72);
  padding: 48px 0 100px;
  font-size: 13.5px;
}
@media (min-width: 768px) { .site-footer { padding: 56px 0 60px; } }
.site-footer .foot-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ywc-white);
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 16px;
}
.foot-grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
@media (min-width: 768px) {
  .foot-grid { grid-template-columns: repeat(3, 1fr); }
}
.foot-grid dt { color: rgba(255,255,255,0.5); font-size: 12px; margin-bottom: 4px; }
.foot-grid dd { margin: 0 0 14px; }
.foot-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 28px;
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 9px 16px;
  border-radius: 999px;
}
.foot-copy {
  margin-top: 28px;
  color: rgba(255,255,255,0.4);
  font-size: 12px;
}
.foot-official {
  color: rgba(255,255,255,0.85);
  text-decoration: underline;
}

/* --- スティッキーCTA（モバイル固定） --- */
.sticky-cta {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 200;
  background: var(--ywc-white);
  border-top: 1px solid var(--ywc-line);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  box-shadow: 0 -6px 20px rgba(0,0,0,0.08);
  transform: translateY(100%);
  transition: transform .25s ease;
}
.sticky-cta.is-visible { transform: translateY(0); }
.sticky-cta-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.sticky-cta-text {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ywc-text-sub);
  line-height: 1.4;
  flex-shrink: 0;
}
.sticky-cta .btn { flex: 1; padding: 13px 10px; font-size: 14px; }
@media (min-width: 900px) {
  .sticky-cta { display: none; }
}

/* --- スクロールリビール --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.is-in { opacity: 1; transform: translateY(0); }

/* --- 悩みリスト（チェック項目）共通 --- */
.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.check-list .icon { margin-top: 3px; color: var(--ywc-red); }

/* --- グリッド --- */
.grid {
  display: grid;
  gap: 20px;
}
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- ステップ番号 --- */
.step-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--ywc-black);
  color: var(--ywc-white);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
}

/* --- モバイルナビ（ハンバーガー：今回はシンプルに主要導線のみのため非表示、拡張用に用意） --- */
.nav-toggle { display: none; }