/* ============================================================
   ダンジョン選択画面 (縦画面)
   ============================================================ */
#app.portrait-mode #dungeon-select-screen {
    padding: 20px;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
}


#app.portrait-mode .dungeon-name-area {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    width: 100%;
    max-width: 700px;
}

#app.portrait-mode .dungeon-name-label {
    font-family: var(--font-pixel);
    color: var(--accent-color);
    font-size: 28px;
    white-space: nowrap;
}

#app.portrait-mode .dungeon-name-input {
    font-family: var(--font-pixel);
    font-size: 36px;
    padding: 16px;
    border-radius: 12px;
    border: 2px solid rgba(79, 172, 254, 0.5);
    background: rgba(12, 16, 38, 0.9);
    color: var(--primary-color);
    flex: 1;
}

/* 難易度タブ */
#app.portrait-mode .difficulty-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    width: 100%;
    max-width: 750px;
    margin-bottom: 12px;
}

#app.portrait-mode .difficulty-tab {
    appearance: none;
    -webkit-appearance: none;
    font-family: var(--font-pixel);
    font-size: 28px;
    flex: 1;
    padding: 10px 0;
    border-radius: 10px;
    border: 2px solid rgba(79, 172, 254, 0.4);
    background: rgba(12, 16, 38, 1);
    color: rgba(180, 200, 255, 0.6);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
}

#app.portrait-mode .difficulty-tab:hover {
    background: rgba(30, 55, 110, 1);
    color: #cce4ff;
    border-color: rgba(79, 172, 254, 0.7);
}

#app.portrait-mode .difficulty-tab:active {
    transform: scale(0.95);
}

#app.portrait-mode .difficulty-tab.active {
    background: linear-gradient(180deg, #2a5a9e, #1c2646);
    color: #ffd700;
    border-color: rgba(255, 215, 0, 0.7);
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.6);
}

#app.portrait-mode .dungeon-grid {
    display: grid;
    grid-template-columns: repeat(2, 250px);
    gap: 48px 8px;
    justify-content: center;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
    width: 100%;
}

#app.portrait-mode .dungeon-cell {
    appearance: none;
    -webkit-appearance: none;
    position: relative;
    width: 250px;
    height: 110px;
    padding: 0;
    border-radius: 12px;
    border: none;
    background: none;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.1s;
}

#app.portrait-mode .dungeon-cell-bg {
    display: block;
    width: 250px;
    height: 110px;
    pointer-events: none;
}

#app.portrait-mode .dungeon-cell-num {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: 4px;
    pointer-events: none;
}

#app.portrait-mode .dungeon-cell-num-icon {
    height: 52px;
    width: auto;
    pointer-events: none;
    filter: drop-shadow(0 1px 4px rgba(0,0,0,0.8));
}

#app.portrait-mode .dungeon-cell:hover:not(:disabled) {
    transform: scale(1.08);
}

#app.portrait-mode .dungeon-cell:active:not(:disabled) {
    transform: scale(0.95);
}

#app.portrait-mode .dungeon-clear-icon {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 58px;
    height: 58px;
    pointer-events: none;
}

#app.portrait-mode .dungeon-cell.locked {
    opacity: 0.55;
    cursor: not-allowed;
}

#app.portrait-mode .top-title-area {
    width: 100%;
    /* タイトル画像容器を全高に */
    height: 100%;
}