/* ==========================================================================
   バトルデスク 公式サイト  style.css
   シンプル・信頼感重視 / 白背景 + 紫アクセント / モバイル優先
   ========================================================================== */

:root {
  --bg:          #ffffff;
  --bg-soft:     #f6f5fb;
  --bg-soft-2:   #efedf9;
  --ink:         #1c1b22;
  --ink-soft:    #4a4856;
  --ink-faint:   #79768a;
  --line:        #e7e4f1;
  --accent:      #6c4ad6;
  --accent-deep: #543abd;
  --accent-soft: #f0ecfb;
  --radius:      14px;
  --maxw:        960px;
  --shadow:      0 1px 2px rgba(28, 27, 34, .04),
                 0 8px 28px rgba(84, 58, 189, .07);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  font-size: 16px;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-deep); }

img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- ヘッダー ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
  text-decoration: none;
  font-size: 17px;
}
.brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 4px 10px rgba(84, 58, 189, .28);
}
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 8px;
  white-space: nowrap;
}
.nav a:hover { color: var(--accent-deep); background: var(--accent-soft); }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn-primary {
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  color: #fff;
  box-shadow: 0 6px 18px rgba(84, 58, 189, .3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(84, 58, 189, .36); }
.btn-secondary {
  background: #fff;
  color: var(--accent-deep);
  border-color: var(--line);
}
.btn-secondary:hover { background: var(--accent-soft); border-color: var(--accent-soft); }

/* ---------- ヒーロー ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 78% -8%, var(--bg-soft-2), transparent 60%),
    radial-gradient(640px 360px at 8% 4%, var(--bg-soft), transparent 60%);
  border-bottom: 1px solid var(--line);
}
.hero .container {
  padding-top: 64px;
  padding-bottom: 64px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--accent-deep);
  background: var(--accent-soft);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(32px, 8vw, 52px);
  line-height: 1.2;
  letter-spacing: .01em;
  font-weight: 800;
}
.hero .lead {
  margin: 0 0 14px;
  font-size: clamp(18px, 4.5vw, 22px);
  font-weight: 700;
  color: var(--accent-deep);
}
.hero p.desc {
  margin: 0 0 30px;
  max-width: 620px;
  color: var(--ink-soft);
  font-size: 16px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* スクリーンショット */
.shots {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.shot {
  aspect-ratio: 9 / 19;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  width: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- セクション共通 ---------- */
section { padding-block: 56px; }
.section-head { margin-bottom: 32px; }
.section-head h2 {
  margin: 0 0 8px;
  font-size: clamp(24px, 6vw, 32px);
  font-weight: 800;
  letter-spacing: .01em;
}
.section-head p {
  margin: 0;
  color: var(--ink-soft);
}
.tag {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}

.alt { background: var(--bg-soft); border-block: 1px solid var(--line); }

/* ---------- 特徴 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.feature {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.feature .ico {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}
.feature .ico svg { width: 22px; height: 22px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; font-weight: 700; }
.feature p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* ---------- 使い方 ---------- */
.steps {
  display: grid;
  gap: 16px;
}
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
.step .num {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  color: #fff;
  font-weight: 800;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 12px rgba(84, 58, 189, .26);
}
.step h3 { margin: 0 0 4px; font-size: 16.5px; font-weight: 700; }
.step p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* ---------- 情報ボックス（広告/サポート/免責） ---------- */
.notebox {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.notebox + .notebox { margin-top: 16px; }
.notebox ul { margin: 12px 0 0; padding-left: 1.2em; color: var(--ink-soft); }
.notebox li { margin-bottom: 6px; }
.notebox p { color: var(--ink-soft); }
.notebox p:last-child { margin-bottom: 0; }

/* 連絡先カード */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}
.contact-card {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 1 1 240px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  text-decoration: none;
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}
.contact-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-soft);
  box-shadow: var(--shadow);
}
.contact-ico {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-deep);
}
.contact-ico svg { width: 21px; height: 21px; }
.contact-ico--x {
  background: #000;
  color: #fff;
}
.contact-text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
  min-width: 0;
}
.contact-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-faint);
}
.contact-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  word-break: break-all;
}

.disclaimer {
  font-size: 14px;
  color: var(--ink-soft);
}
.disclaimer strong { color: var(--ink); }

/* ---------- フッター ---------- */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  padding-block: 36px;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-footer .f-links { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.site-footer a { color: var(--ink-soft); text-decoration: none; font-size: 14px; font-weight: 600; }
.site-footer a:hover { color: var(--accent-deep); }
.social-link {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff !important;
  transition: transform .14s ease, background .14s ease;
}
.social-link svg { width: 15px; height: 15px; }
.social-link:hover { background: var(--accent-deep); transform: translateY(-1px); }
.copy { font-size: 13px; color: var(--ink-faint); }

/* ---------- 法務ページ ---------- */
.legal { padding-block: 48px; }
.legal .updated {
  color: var(--ink-faint);
  font-size: 14px;
  margin: 0 0 28px;
}
.legal h1 {
  font-size: clamp(26px, 6vw, 34px);
  margin: 0 0 6px;
  font-weight: 800;
}
.legal h2 {
  font-size: 19px;
  margin: 38px 0 10px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-weight: 700;
}
.legal h2 .n {
  color: var(--accent);
  font-weight: 800;
  margin-right: 8px;
}
.legal p { color: var(--ink-soft); margin: 0 0 14px; }
.legal ul { color: var(--ink-soft); padding-left: 1.3em; margin: 0 0 14px; }
.legal li { margin-bottom: 6px; }
.legal a { word-break: break-all; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 36px;
  font-weight: 700;
  text-decoration: none;
  color: var(--accent-deep);
}
.back-link:hover { text-decoration: underline; }

/* ---------- レスポンシブ ---------- */
@media (min-width: 720px) {
  .features { grid-template-columns: repeat(3, 1fr); }
  .hero .container { padding-top: 84px; padding-bottom: 72px; }
}

@media (max-width: 520px) {
  .nav a:first-child { display: none; } /* 「トップ」はブランドロゴで代替 */
  .shots { gap: 12px; }
  .hero-actions .btn { flex: 1 1 100%; }
}