:root {
  /* BFHサイト寄せの色イメージ */
  --bg-deep: #020617;
  --bg-card: #050818;
  --bg-sidebar: #020617;
  --border-soft: #1e293b;
  --accent-main: #22c55e;   /* ネオングリーン */
  --accent-sub: #38bdf8;    /* 青シアン */
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
}

/* ========== ベース ========== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans JP", "Yu Gothic", "YuGothic", "Hiragino Kaku Gothic ProN",
    "Meiryo", sans-serif;
  background: radial-gradient(circle at top, #0b1120 0, var(--bg-deep) 55%);
  color: var(--text-main);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

.app {
  height: 100vh;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas:
    "sidebar header"
    "sidebar main";
  background: radial-gradient(circle at top, #020617 0, #000 60%);
}

/* ========== サイドバー ========== */
.sidebar {
  grid-area: sidebar;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-soft);
  padding: 18px 14px 24px;
  overflow-y: auto;
}

.logo {
  margin-bottom: 16px;
  text-align: center;
}

.logo-link {
  display: inline-block;
}

.logo-image {
  display: block;
  max-width: 180px;
  width: 100%;
  height: auto;
  margin: 0 auto;
}

.top-menu-link {
  margin-bottom: 14px;
}

.top-menu-button {
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 6px;
  background: #020617;
  color: var(--text-main);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background 0.15s, transform 0.06s, box-shadow 0.15s;
  border: 1px solid var(--border-soft);
  text-transform: uppercase;
}

.top-menu-button:hover {
  background: #02091b;
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.4);
  transform: translateY(-1px);
}

nav {
  font-size: 14px;
}

.accordion-section {
  margin-bottom: 10px;
}

.accordion-header {
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 6px;
  background: #020617;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.15s, transform 0.06s;
  color: var(--text-main);
  border: 1px solid transparent;
}

.accordion-header:hover {
  background: #02091b;
  border-color: var(--border-soft);
  transform: translateY(-1px);
}

.accordion-header .label {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.accordion-header .caret {
  font-size: 11px;
  opacity: 0.8;
}

.submenu {
  list-style: none;
  margin-top: 4px;
  margin-left: 4px;
  padding-left: 6px;
  border-left: 1px solid var(--border-soft);
  display: none;
}

.accordion-section.open .submenu {
  display: block;
}

.submenu li {
  margin: 4px 0;
}

.menu-item {
  width: 100%;
  text-align: left;
  padding: 6px 8px;
  border-radius: 4px;
  font-size: 13px;
  background: transparent;
  transition: background 0.12s, transform 0.06s;
  color: var(--text-main);
}

.menu-item:hover {
  background: #02091b;
  transform: translateX(1px);
}

.menu-item.active {
  background: linear-gradient(90deg, var(--accent-main), var(--accent-sub));
  color: #020617;
  font-weight: 600;
}

/* ========== 上部ヘッダー ========== */
.topbar {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(2, 6, 23, 0.96);
  backdrop-filter: blur(12px);
  position: relative;
  z-index: 2;
}

.top-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.top-title-main {
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.7;
  color: var(--text-muted);
}

.top-title {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--text-main);
}

.top-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* スマホでメイン表示時の戻るボタン（PCでは非表示） */
.mobile-back-btn {
  display: none;
  padding: 6px 11px;
  border-radius: 999px;
  background: #02091b;
  font-size: 13px;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border-soft);
  color: var(--text-main);
}

.mobile-back-btn .icon {
  font-size: 15px;
}

/* ========== CONNECT ボタン & ウォレット表示 ========== */
.connect-btn {
  padding: 6px 12px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--accent-main);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.connect-btn:hover {
  background: rgba(34, 197, 94, 0.1);
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.4);
}

.connect-btn.connected {
  border-color: var(--border-soft);
  color: var(--text-main);
  background: #02091b;
}

.wallet-info {
  display: none;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-soft);
}

.wallet-info.visible {
  display: inline-flex;
}

.wallet-info-logo {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #bbf7d0, var(--accent-main));
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.9);
}

/* ========== PC右上メニュー（クリック開閉版） ========== */
.desktop-menu {
  position: relative;
}

.desktop-menu-button {
  padding: 6px 14px;
  border-radius: 999px;
  background: #02091b;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid var(--border-soft);
  color: var(--text-main);
}

.desktop-menu-button:hover {
  border-color: var(--accent-sub);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5);
}

.desktop-menu-dropdown {
  position: absolute;
  right: 0;
  top: 120%;
  min-width: 200px;
  background: #020617;
  border-radius: 10px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.8);
  padding: 6px 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.15s, transform 0.15s;
  border: 1px solid var(--border-soft);
  z-index: 10;
}

.desktop-menu.open .desktop-menu-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.desktop-menu-item {
  display: block;
  padding: 8px 14px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--text-main);
}

.desktop-menu-item:hover {
  background: #02091b;
  color: var(--accent-sub);
}

/* ========== メインエリア（iframe） ========== */
.main {
  grid-area: main;
  background: radial-gradient(circle at top, #020617 0, #000 60%);
  overflow: hidden;
  height: 100%;              /* ←追加 */
}

.main-inner {
  height: 100%;
  padding: 24px 20px 40px;
  overflow-y: auto;
  display: flex;
  justify-content: center;
}

.page-wrapper {
  width: 100%; /* 横幅制限なし。中身が広い時はiframe内で横スクロール */
}

.content-frame {
  width: 100%;
  height: 100%;        /* ← こうするパターン */
  border-radius: 14px;
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.7);
}

/* ========== スマホ下部固定メニュー ========== */
.mobile-footer-menu {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 6px 8px;
  background: rgba(2, 6, 23, 0.97);
  border-top: 1px solid var(--border-soft);
  z-index: 20;
}

.mobile-footer-inner {
  display: flex;
  justify-content: space-around;
  gap: 4px;
}

.mobile-footer-link {
  flex: 1;
  text-align: center;
  font-size: 11px;
  padding: 6px 4px;
  border-radius: 999px;
  background: #02091b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border: 1px solid var(--border-soft);
  color: var(--text-main);
}

.mobile-footer-link:hover {
  border-color: var(--accent-sub);
}

/* ========== スマホレイアウト ========== */
@media (max-width: 899px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas:
      "header"
      "main";
  }

  .sidebar {
    position: fixed;
    inset: 0;
    max-width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    transform: translateX(0);
    transition: transform 0.2s ease-out;
    z-index: 30;
  }

  .sidebar.sidebar-hidden-on-content {
    transform: translateX(-100%);
  }

  .topbar {
    padding-inline: 14px;
  }

  .top-title {
    font-size: 16px;
  }

  .desktop-menu {
    display: none; /* PC右上メニューはスマホ非表示 */
  }

  /* 最初はメイン全体を隠す（メニューだけの状態） */
  .main.main-hidden {
    display: none;
  }

  .mobile-back-btn {
    display: none; /* JSでメイン表示時に出す */
  }

  .app.content-active .mobile-back-btn {
    display: inline-flex;
  }

  .main-inner {
    padding: 16px 10px 56px;
  }

  .content-frame {
    border-radius: 10px;
    min-height: calc(100vh - 120px); /* ヘッダー＋フッター分 */
  }

  .mobile-footer-menu {
    display: block;
  }

  .page-wrapper {
    max-width: 100%;
  }
}